Attachment 4. Manufacturer's Data Sheet & Instruction Manual.pdf

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a) S ho p

D ra w in gs

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Norval Pressure regulator

b) Gas Regulator

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Classification and Area of Application

NORVAL - standard version

NORVAL

The NORVAL is a downstream pressure regulator, self actuated, spring loaded for medium and low pressure applica-tions.

It is suitable for gaseous, non-corrosive, previously filtered fluids.

It is characterized by a quick response to varying operating conditions, which make it particularly suitable for use when serving ON-OFF burners and in any industrial process characterized by a quick change of the flow rate.

Its features of good accuracy of regulation, even in presence of significant variations of the upstream pressure and/or flow rate, make the Norval regulator also particularly suitable in distribution networks for civil use.

The NORVAL regulator, in its basic version, is classified according to the European standard EN 334, as a regulator which reacts in opening (Fail to Open).

It is Truly a TOP ENTRY design, which confers to the regulator management advantages, for example the ability to performs full maintenance without uninstalling it from the connection pipe.

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Providing Solutions for Oil and Gas

Functional features:*

Maximum inlet ¢ pressure up to: 19,6 bar for regulators from DN 25 (1”) to DN 80 (3”) 8 bar for regu-lators from DN 100 (4”) to DN 200 (8”)

Range of downstream pressure: ¢ from 8 to 4.400 mbar for regulators from DN 25 (1”) to DN 100 (4”) from 12 to 1.800 mbar for regulators DN 150 (6”) and DN 200 (8”)

Minimum ambient temperature: ¢ Execution up to -40°C (to specify in the request ).

Maximum ambient temperature: ¢ +60°C

Inlet gas temperature: ¢ up to -20°C + 60°C

Accuracy class AC: ¢ up to 5

Look-up pressure class SG: ¢ up to 10

Design features:

Nominal dimensions DN: ¢ 25 (1”); 40 (1”1/2); 50 (2”); 65 (2”1/2); 80 (3”); 100 (4”); 150 (6”);

200 (8”).

Flanged connections: ¢ UNI PN 16; class 150 RF

Materials: **

Body: ¢ Cast steel ASTM A 216 WCB (all DN).

Spheroidal ductile iron GS 400 – 18 ISO 1083 DN 150 (6”) includ-ed.

Covers: ¢ Diameter from 375 to 630 Drop-forged carbon steel / from 658 to 817 Alluminium

Diaphragm: ¢ Rubberized canvas (performed by hot-pressing process).

Seat: ¢ Stainless steel

Sealing ring: ¢ Nitril rubber

Connection fittings: ¢ In zinc-plated carbon steel according to DIN 2353;

Stainless steel on request

REMARK: * Different functional features available on request.

** The materials indicated above refer to the standard models.

Different materials can be provided according to specific needs.

FEATURES

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The project of NORVAL regulator has been designed with a high degree of modularity that allows to incorporate, within the basic regulator, alternative devices and additional accessories.

These can also be added to a basic regulator at a later time, with no need to change the existing assembly piping connections.

MODULARITY AND ACCESSORIES

SLAM SHUT DEVICE model SN/...

The slam shut valve can be calibrated for pressure increase, over pressure shut off (OPSO) and/or for pressure drop, under pressure shut off (UPSO).

The two intervention modes can be tuned independently, using the dedicated calibration springs: a spring for the intervention of maximum pressure and a second spring for the intervention of minimum pressure.

It is a Safety Accessory whose task is that of blocking the gas flow if abnormal pressure conditions appear, com-pared to the one set during calibration of the dedicated pressure switch.

The calibration can be varied in, according to the operating needs, in the fields referred to in the table N.2 below, ac-cording to the model of pressure switch forecast.

There are two available models: SN91 and SN92, the accuracy class of the block device is up to AG up to 2,5.

The slam shut device is equipped with a button for local manual control of the block operation.

The reset of the slam shut device, for safety reasons, is exclusively manual and, inside the slam shut valve, a bypass device is provided, in order to make the reset operation easier.

The slam-shut device can be equipped with pneumatic or electromagnetic accessories type allowing control, as well as with sensors (micro-switches) for the remote signaling of its tripping.

NORVAL - with incorporated slam shuth Fig.2

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The MONITOR REGULATOR is a safety accessory whose task is that of performing the functions of the regu-lator in case of failure of the main regulator.

It is a regulator that is normally in the fully open position during normal operation of the service regulator.

The Monitor regulator is an emergency pressure regulator that is generally located in the flow direction of the gas, upstream another pressure regulator that performs the function of SERVICE regulator.

In order to allow a NORVAL regulator to perform the MONITOR regulator function it is necessary to include, in addition to the Basic regulator, a ER device ensuring greater accuracy of the regulated pressure and allows rapid intervention of the device.

Device for in line monitor regulator operation (ER)

NORVAL - With in-line monitorFig.3

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The regulated outlet pressure range is determined by the control head installed. The table below sums up the heads available for every size and the ranges of outlet pressure expressed in mbar.

In general, the choice of a regulator is made on the basis of the calculation of the flow rate determined by the use of flow rate coefficients (Cg or KG) as indicated by the EN 334 standard.

However, the analytical method of calculation is not suitable for a correct sizing of the regulator, because it is nec-essary not to consider the whole theoretical flow rate obtainable from the analytical method, but only a percentage of it, which varies from case to case, depending on the desired class of accuracy and on the available pressure drop.

Therefore it is more appropriate to refer to the following tables that provide directly the value of the flow rates that can be provided by the specific regulator considered, depending on the specific operating conditions.

The tables provide the value of the flow rate, expressed in Stmc/h, of a natural gas having a relative density to air of 0.61 and at a temperature of 15 °C, to the barometric pressure of 1,013 bar.

Sizing of the Pressure Regulator

Nominal dimension DN

Millimeter 25 40 50 65 80 100 150 200

Inches 1" 1"1/2 2" 2"1/2 3" 4" 6" 8" ø 817 12 ÷ 79 12 ÷ 79 ø 658 75 ÷ 405 75 ÷ 405 ø 630 10 ÷ 80 10 ÷ 80 12 ÷ 80 220 ÷ 650 220 ÷ 650 ø 495 16 ÷ 83 16 ÷ 83 16 ÷ 83 80 ÷ 530 80 ÷ 530 80 ÷ 530 390 ÷ 1800 390 ÷ 1800 ø 375 80 ÷ 1100 80 ÷ 1100 80 ÷ 1100 470 ÷ 2800 470 ÷ 2800 470 ÷ 2800 ø 375TR 900 ÷ 4400 900 ÷ 4400 900 ÷ 4400 900 ÷ 4400 900 ÷ 4400 900 ÷ 4400

Tab.1

Pressure switch SN 91 SN 92

Set point range for Overpressure (OPSO) 25 ÷ 1100 650 ÷ 5500

Set point range for Underpressure (UPSO) 10 ÷ 900 200 ÷ 3100

Tab.2

Pressure regulator

Slam shut

Possible set pressure range

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* AC10

NORVAL DN 150

Inlet pressure Pu (bar)

Outlet pressure Pd (bar)

0,02 0,05 0,08 0,1 0,3 0,5 0,75 1 1,8

0,2 4200 3700 3600 3400 0,3 5300 5000 4700 4600 0,5 6800 6800 6700 6700 5000 0,75 7800 8700 8400 8400 7500 5400

1 9000 10300 9300 9300 9700 8400 5900 1,5 11500 13400 12400 12400 12800 12300 10900 9000 2 15600 15900 16000 14300 16200 15600 14000 13500 11000 4 15600 18700 17000 17000 23000 27000 23400 25000 25000 6 15600 20300 17800 17500 25600 34000 31000 32000 37000 8 9400 20300 18700 16000 29000 34000 34000 40000 43000

Tab.7

NORVAL DN 200

Inlet pressure Pu (bar)

Outlet pressure Pd (bar))

0,02 0,05 0,08 0,1 0,3 0,5 0,75 1 1,8

0,2 6600 5800 5600 5300 0,3 8300 7800 7300 7300 0,5 10700 10700 10500 10500 7800 0,75 12200 13600 13200 13200 11700 13500

1 14100 16100 14600 14600 15000 16000 16000 1,5 18000 21000 19500 19500 20000 21000 20000 20000 2 24400 24900 25000 22000 25000 25000 23000 24000 25000 4 24400 29300 27000 26700 36000 42000 36500 39000 40000 6 24400 31700 28000 27500 40000 53000 49000 51000 58000 8 14600 31700 29000 25000 45000 53000 53000 63000 72000

Tab.8

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For operating conditions and dimensions not covered by the tables above please contact our customer care.

For different gases and for natural gas with a different density than 0,61shall be applied the correction coefficients resulting from the following formula:

The chart 9 show the correction factors FC valid for above mentioned gas at15 °C and the relative density declared.

Correction factors FC

Type of gas Relative density Fc factor

Air 1.0 0.78

Propane 1.53 0.63

Butane 2.0 0.55

Nitrogen 0.97 0.79

Oxygen 1.14 0.73

Carbon dioxide 1.52 0.63 Tab.9

)16.273(

8.175 tS Fc

+x

Flow rate conversion

Stm3/h x 0,94795 = Nm3/h

Tab.10

S = relative density to air

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The following examples are provided as a recommendation to get the best performance from the regulator

NORVAL.

TYPICAL CONNECTION DIAGRAMS

Inlet pressure

Outlet pressure x D

N

L I

Regulator Sensing line Vent

Pressure gauge

ON/OFF valve

DN

x D

N > 4 x DN

L I

ON/OFF valve

Pressure gauge

Vent

Sensing line

Regulator

D N

> 2 x DN

IN-LINE INSTALLATION

INSTALLATION AT SQUARE

Fig.4

Fig.5

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RECOMMENDED INSTALLATIONS

Standard position

Upside down position

Fig.6

Fig.7

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Regulator with block device SN/...

Monitor regulator + adjusting regulator

INSTALLATION EXAMPLES

Fig.8

Fig.9

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Monitor regulator with block device SN/... + adjusting regulator

Slam shut valve SCN + adjusting regulator with block device SN/...

Fig.10

Fig.11

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DN DN

c a1 d b a c s

DN DN

b2 b1 a

DIMENSIONS

Size (mm) 25 40 50 65 80 100 150 200

Inches 1” 1"1/2 2" 2"1/2 3" 4” 6" 8"

Norval 44 48 50 75 92 121 206 291

Norval with slam-shut (SN) 48 53 55 82 97 126 211 296

Norval with monitor (ER) 48 55 58 85 100 129 216 302

Norval with slam-shut (SN) and monitor (ER) 53 60 63 90 105 134 221 307

Tab.12

Weight in Kg

Overall dimensions in mm

Nominal dimensions DN c ø 817 ø 658 ø 630 ø 495 ø 375 ø 375TR mm Inches s* b b1 b2 a a1 d a a1 d a a1 d a a1 d a a1 d a a1 d

25 1" 183 100 200 250 460 630 175 415 585 150 425 595 155

40 1"1/2 223 120 220 270 475 645 190 435 605 165 445 615 170

50 2" 254 120 220 270 475 645 190 435 605 165 445 615 170

65 2"1/2 277 140 240 290 540 710 220 500 670 210 455 625 190 465 635 195

80 3" 298 140 240 290 540 710 220 500 670 210 455 625 190 465 635 195

100 4” 352 180 280 330 640 810 310 600 770 300 555 725 275 565 735 280

150 6" 451 220 320 370 760 930 400 720 890 380 675 845 380 670 840 375

200 8” 543 260 360 410 860 1030 500 820 990 480 775 845 480 770 940 475

Tab.11

Pneumatic fittings; Sensing line regulator: 14x12mm. Other: 10x8mm.

Dimensions S according to EN 334 and IEC 534-3.

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PRESSURE REGULATOR

NORVAL

TECHNICAL MANUAL MT044

INSTALLATION, COMMISSIONING AND MAINTENANCE INSTRUCTIONS

E

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TECHNICAL MANUAL MT044

Inlet pressure. Outlet pressure.

NORVAL

Issue February 2003

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The PIETRO FIORENTINI SPA with registered office in Milan (Italy) – via Rosellini, 1, declares under its sole responsibility that the apparatus series Norval bearing the CE marking showed in this manual are designed, manufactured, tested and inspected in accordance with the provisions of Pressure Equipment Directive 97/23/EC

(PED).

Following conformity assessment procedure has been carried out:

➤ EC type-examination (module B) by DVGW (ID n° 0085) – report 02/102/4301/850 issued 12th April 2002 In this report both the versions incorporating the safety shut-off devices series when controlling overpressure and in-line monitor system which includes a Norval with the function of active regulator and a 2° Norval with the function of in-line monitor, are classified as safety accessories according to clause 2.1.3 of art. 1 of PED.

➤ Production quality assurance (module D) by BUREAU VERITAS (ID n° 0062) – Attestation d’Approbation du Sistème Qualité N° CE-PED-D-FIO001-02-ITA issued 15th May 2002.

Further it declares that the classification of the performances characteristics has been verified by DVGW according to the procedures given by European standard EN 334 and/or by standard DIN 3381. The classification is detailed in the aforesaid DVGW report.

Arcugnano 25/9/2002 The Pietro Fiorentini SpA

DECLARATION OF CONFORMITY

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GENERAL PRECAUTIONS

- The apparatus described in this manual is a device subject to pressure installed in systems under pressure;

- the apparatus in question is normally installed in systems for transporting flammable gases

(natural gas, for example).

PRECAUTIONS FOR THE OPERATORS

Before proceeding with installation, commissioning or maintenance, operators must:

- examine the safety provisions applicable to the installation in which they must work;

- obtain the authorisations necessary for working when so required;

- use the necessary means of individual protection (helmet, goggles, etc.);

- ensure that the area in which they operate is fitted with the means of collective protection envisaged and with the necessary safety indications.

HANDLING

The handling of the apparatus and of its components must only be carried out after ensuring that the lifting gear is adequate for the loads to lift (lifting capacity and functionality). The apparatus must be handled using the lifting points provided on the apparatus itself.

Motorised means must only be used by the persons in charge of them.

PACKING

The packing for trasportation of equipment and of relevant spare parts are designed and shaped to avoid damage to any part during transportation, warehousing and handling activities. Therefore the equipment and spare parts shall be kept into their packing until their installation in the final site. After packing is open, check that no damage occured to any goods. If damage occured inform the supplier and keep packing for any verification.

INSTALLATION

If the installation of the apparatus requires the application of compression fittings in the field, these must be installed following the instructions of the manufacturer of the fittings themselves. The choice of the fitting must be compatible with the use specified for the apparatus and with the specifications of the system when envisaged.

PRECAUTIONS

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COMMISSIONING

Commissioning must be carried out by adequately trained personnel.

During the commissioning activities, the personnel not strictly necessary must be ordered away and the no-go area must be properly signalled (signs, barriers, etc.).

Check that the settings of the apparatus are those requested; if necessary, reset them to the required values in accordance with the procedures indicated in the manual.

When commissioning, the risks associated with any discharges into the atmosphere of flammable or noxious gases must be assessed.

In installations in natural gas distribution networks, the risk of the formation of explosive mixtures (gas/air) inside the piping must be considered.

CONFORMITY TO DIRECTIVE 97/23/EC (PED)

Pressure regulator Norval is classified as fail open regulator according to the standard EN 334 therefore it is categorized as pressure accessory according to directive 97/23/EC (PED).

The safety device in-line monitor is categorized as safety accessory according PED. The regulator Norval when incorporating slam shut valve with pressure switche for overpressure is categorized as safety accessory according to PED, therefore it can be used both as pressure accessory and safety accessory to PED.

Conformity with Directive 97/23/EC and CE marking of pressure regulator and relevant accessory require installation in the system with minimum requirements according to: EN 12286.

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1.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PAGE 9

1.1 MAIN FEATURES

1.2 NORVAL OPERATION

1.3 REGULATOR SETTING SPRINGS

1.3.1 REGULATOR SETTING SPRINGS

2.0 INSTALLATION

2.1 GENERAL

3.0 ACCESSORIES

3.1 RELIEF VALVE

3.1.1 DIRECT INSTALLATION IN THE LINE

3.1.2 INSTALLATION WITH ON/OFF VALVE

4.0 MODULARITY

4.1 INCORPORATED SLAM-SHUT I-N

4.2 SLAM-SHUT SETTING SPRINGS

4.3 NORVAL FUNCTIONING AS A MONITOR

4.3.1 CHARACTERISTIC

4.3.2 DIVAL OPERATION WITH MONITOR FUNCTIONS

5.0 START UP

5.1 GENERAL

5.2 GAS INPUT, CONTROL OF EXTERNAL TIGHTNESS AND SETTING

5.3 COMISSIONING THE REGULATOR

5.4 COMMISSIONING THE REGULATOR WITH INCORPORATED I-N SLAM-SHUT

5.5 COMMISSIONING THE REGULATOR PLUS NORVAL IN-LINE MONITOR

WITH INCORPORATED I-N SLAM-SHUT VALVE

6.0 TROUBLE-SHOOTING

6.1 REGULATOR

6.2 REGULATOR SLAM-SHUT

7.0 MAINTENANCE

7.1 GENERAL

7.2 NORVAL REGULATOR MAINTENANCE PROCEDURE

7.3 NORVAL REGULATOR + I-N MAINTENANCE PROCEDURE

7.4 MAINTENANCE PROCEDURE FOR THE NORVAL REGULATOR + I-N + ER

8.0 FINAL OPERATIONS

8.1 THIGHTNESS AND SETTING CHECKS

8.2 START UP

9.0 LIST OF RECOMMENDED SPARES

INDEX

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1.0 INTRODUCTION

The scope of this manual is to provide the essential information for the installation, commissioning, disassembly, re-assembly and maintenance of NORVAL regulators.

It is also appropriate to provide a brief illustration of the main features of the regulator and of its accessories.

1.1 MAIN FEATURES

The NORVAL pressure regulator is a pressure regulator for previously cleaned gaseous fluids and is suitable for medium and low pressures.

The NORVAL is a normally open regulator and consequently opens in the event of:

- breakage of the main diaphragm

- no regulated pressure signal The main specifications of this regulator are:

• Design pressure: up to 16 bar;

• Operating temperature range: -20 °C to 60 °C;

• Ambient temperature: -20 °C to 60 °C;

• Inlet pressure range bpe:

0.1 to 16 bar for DN 1" to 3"

0.1 to 8 bar for DN 4" to 8"

• Regulating range possible Wh:

0.0075 to 4.4 bar for DN 1" to 4"

0.012 to 1.8 bar for DN 6" to 8"

• Precision class AC: up to 5;

• Closing pressure class SG: up to 10.

1.2 OPERATION

NORVAL series regulators (Fig.1) are spring actuated devices with control of the downstream pressure by means of an external sensing line 1.

The downstream pressure is controlled by means of the equilibrium between the action of the spring 2 and the action exerted by the downstream pressure on the diaphragm 3.

The movement is transmitted by the shaft 4 to the obturator 5 which moves perpendicularly to the gas flow direction. Hermetic tightness is ensured by a rubber gasket fixed to the obturator.

Regulation is therefore obtained from the confrontation between the load of the setting spring 2 and the thrust on the diaphragm 3 deriving from the downstream pressure.

If during operation, for example, there is a drop in the downstream pressure Pa below the set-point (as a result of an increase in the requested flow rate or a drop in the upstream pressure) an imbalance is created which causes the obturat or 5 to open and therefore an increase in the flow until the downstream pressure reaches the set-point again. Vice versa, when the downstream pressure rises above the set-point (as a result of a drop in the requested flow rate or an increase in the upstream pressure) the obturator 5 closes and the flow rate drops until the downstream pressure reaches the set-point again.

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Pe

Pa

Fig. 1

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1.3 TAB. 1 Standard Regulator Setting Springs (Fig. 2)

2701623 WHITE 4.0 9.00 11.00 7.5 ÷ 9.5 9.5 ÷ 11 12 ÷ 15

2701700 YELLOW 4.2 9.00 11.00 8.5 ÷ 11 10.5 ÷ 12 13 ÷ 17

2701863 ORANGE 4.5 9.00 11.00 10 ÷ 13 12 ÷ 14 15 ÷ 21

2701966 RED 350 4.8 9.50 11.50 11 ÷ 16 13 ÷ 17 16 ÷ 23

2702205 GREEN 5.0 9.00 11.00 12 ÷ 17 11 ÷ 19 21 ÷ 29

2702385 BLACK 5.5 10.50 12.50 15 ÷ 21 16 ÷ 24 25 ÷ 35

2702565 BLUE 6.0 11.50 13.50 19 ÷ 27 20 ÷ 28 31 ÷ 42

2702755 WHITE 6.5 8.50 10.50 21 ÷ 36 22 ÷ 37 38 ÷ 60 80 ÷ 120

2702975 YELLOW 7.0 8.50 10.50 28 ÷ 48 30 ÷ 50 55 ÷ 83 75 ÷ 85 115 ÷ 170

2703175 ORANGE 7.5 9.25 11.25 43 ÷ 63 45 ÷ 65 80 ÷ 110 155 ÷ 230

2703360 RED 85 8.0 9.00 11.00 53 ÷ 80 55 ÷ 80 95 ÷ 135 190 ÷ 280

2703525 GREEN

8.5 9.00 11.00 125 ÷ 170 250 ÷ 360

2703745 BLACK 9.0 9.00 11.00 150 ÷ 220 300 ÷ 430

2703895 BLUE 9.5 9.50 11.50 170 ÷ 260 360 ÷ 500

2704062 BROWN 10.0 9.00 11.00 230 ÷ 340 470 ÷ 720

2704400 AZURE 11.0 9.50 11.50 300 ÷ 500 680 ÷ 950 680 ÷ 950

2704515 WH.-YELL. 11.5 9.25 11.25 400 ÷ 530 850 ÷ 1100

2704390 GREEN 11.0 7.50 9.50 900 ÷ 1600

2704615 BLUE

12.0 8.00 10.00 900 ÷ 1250 1450 ÷ 2400

2704820 VIOLET 13.0 8.00 10.00 1200 ÷ 1950 2100 ÷ 3150

2704910 AZURE 14.0 8.00 10.00 1800 ÷ 2800 3000 ÷ 4400

Springs characteristics SETTING RANGE in mbar

Covers

CodE Colour De Lo d i it

Ø 630 Ø 495 Ø 375 Ø 375 TR

DN: DN: DN: DN: DN: DN: DN:

2”1/2 - 3” 4” 1” ÷ 2” 2”1/2 ÷ 4” 1” ÷ 2” 2”1/2 ÷ 4” 1” ÷ 4”

De = Ø external diameter d = Ø wire diameter i = active coils Lo = spring length it = total coils

2702599 WHITE 100 6.0 10.5 12.5 12 ÷ 14.5

2702790 YELLOW 100 6.5 11.5 13.5 14 ÷ 18

2703015 ORANGE 100 7.0 12.0 14.0 17 ÷ 21

2703199 RED 100 7.5 12.5 14.5 20 ÷ 25

2703380 GREEN 100 8.0 12.5 14.5 24 ÷ 31

2703560 BLACK 100 8.5 12.0 14.0 30 ÷ 39

2703827 BLUE 100 9.0 11.5 13.5 38 ÷ 49

2703930 BROWN 100 9.5 11.0 13.0 47 ÷ 62 75 ÷ 100

2704108 VIOLET 100 10.0 10.5 12.5 60 ÷ 79 95 ÷ 130

2704440 AZURE 100 11.0 11.0 13.0 125 ÷ 170

2704670 WH.-YELL. 100 400 12.0 10.5 12.5 165 ÷ 230 220 ÷ 300 390 ÷ 535

2704108 VIOLET 100 10.0 10.5 12.5

210 ÷ 280 280 ÷ 360 500 ÷ 650

2703720 WHITE 65 9.0 15.5 17.5

2704440 AZURE 100 11.0 11.0 13.0

270 ÷ 330 330 ÷ 420 600 ÷ 750

2703720 WHITE 65 9.0 15.5 17.5

2704670 WH.-YELL. 100 12.0 10.5 12.5

320 ÷ 405 400 ÷ 520 700 ÷ 930

2703720 WHITE 65 9.0 15.5 17.5

2704670 WH.-YELL. 100 12.0 10.5 12.5

500 ÷ 650 900 ÷ 1310

2704210 RED 65 10.5 15.5 17.5

2704985 WH.-YELL. 100 14.0 11.0 13.0

1290 ÷ 1800

2704210 RED 65 10.5 15.5 17.5

Ø 817 Ø 658 Ø 630 Ø 495

DN: 6” ÷ 8” DN: 6” ÷ 8” DN: 6” ÷ 8” DN: 6” ÷ 8”

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1.3.1 TAB. 2 Upturned Regulator Setting Springs (Fig. 3)

2701966 RED 4.8 9.50 11.50 8 ÷ 12

2702205 GREEN 5.0 9.00 11.00 9 ÷ 13 9 ÷ 12 10 ÷ 17

2702385 BLACK

5.5 10.50 12.50 12 ÷ 15 11 ÷ 15 14 ÷ 22

2702565 BLUE 6.0 11.50 13.50 14 ÷ 18 14 ÷ 19 20 ÷ 28

2702755 WHITE 6.5 8.50 10.50 17 ÷ 28 16 ÷ 26 25 ÷ 45 80 ÷ 120

2702975 YELLOW 7.0 8.50 10.50 25 ÷ 40 22 ÷ 40 40 ÷ 70 60 ÷ 70 115 ÷ 170

2703175 ORANGE 7.5 9.25 11.25 35 ÷ 45 35 ÷ 55 65 ÷ 90 65 ÷ 95 155 ÷ 230

2703360 RED 8.0 9.00 11.00 45 ÷ 67 50 ÷ 70 80 ÷ 120 190 ÷ 280

2703525 GREEN

8.5 9.00 11.00 62 ÷ 90 62 ÷ 90 110 ÷ 155 250 ÷ 360

2703745 BLACK 85 9.0 9.00 11.00 135 ÷ 205 315 ÷ 470

2703895 BLUE 9.5 9.50 11.50 155 ÷ 245 360 ÷ 540

2704062 BROWN 10.0 9.00 11.00 215 ÷ 325 470 ÷ 720 470 ÷ 720

2704400 AZURE 11.0 9.50 11.50 285 ÷ 500 680 ÷ 1050 680 ÷ 1050

2704040 ORANGE 10.0 8.00 10.50

2704390 GREEN 11.0 7.50 9.50 900 ÷ 1600

2704615 BLUE 260 12.0 8.00 10.00 900 ÷ 1400 1450 ÷ 2400

2704820 VIOLET 13.0 8.00 10.00 1200 ÷ 1950 2100 ÷ 3150

2704910 AZURE 14.0 8.00 10.00 1800 ÷ 1050 3000 ÷ 4400

De = Ø external diameter d = Ø wire diameter i = active coils Lo = spring length it = total coils

Springs characteristics SETTING RANGE in mbar

Covers

Code Colour De Lo d i it

Ø 630 Ø 495 Ø 375 Ø 375 TR

DN: DN: DN: DN: DN: DN: DN:

2”1/2 - 3” 4” 1” ÷ 2” 2”1/2 ÷ 4” 1” ÷ 2” 2”1/2 ÷ 4” 1” ÷ 4”

2703380 GREEN 100 8.0 12.5 14.5 8 ÷ 13

2703560 BLACK 100 8.5 12.0 14.0 12 ÷ 21

2703827 BLUE 100 9.0 11.5 13.5 20 ÷ 31

2703930 BROWN 100 9.5 11.0 13.0 29 ÷ 45

2704108 VIOLET 100 10.0 10.5 12.5 42 ÷ 71 75 ÷ 110

2704440 AZURE 100 11.0 11.0 13.0 65 ÷ 95 100 ÷ 150

2704670 WH.-YELL. 100 12.0 10.5 12.5 140 ÷ 210 190 ÷ 270 340 ÷ 480

2704108 VIOLET 100 10.0 10.5 12.5

190 ÷ 260 250 ÷ 330 450 ÷ 600

2703720 WHITE 65 400 9.0 15.5 17.5

2704440 AZURE 100 11.0 11.0 13.0

250 ÷ 310 300 ÷ 390 550 ÷ 700

2703720 WHITE 65 9.0 15.5 17.5

2704670 WH.-YELL. 100 12.0 10.5 12.5

300 ÷ 405 370 ÷ 490 650 ÷ 880

2703720 WHITE 65 9.0 15.5 17.5

2704670 WH.-YELL. 100 12.0 10.5 12.5

470 ÷ 600 850 ÷ 1260

2704210 RED 65 10.5 15.5 17.5

2704985 WH.-BLUE 100 14.0 11.0 13.0

1240 ÷ 1800

2704210 RED 65 10.5 15.5 17.5

Ø 817 Ø 658 Ø 630 Ø 495

DN: 6” ÷ 8” DN: 6” ÷ 8” DN: 6” ÷ 8” DN: 6” ÷ 8”

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2.1 GENERAL

Pressure regulator does not require any supplementary upstream safety accessory for protection against overpressure compared with its design pressure PS, when upstream reducing station is sized for a max downstream incidental pressure MIPd ≤ 1,1 PS.

Before installing the regulator it is necessary to ensure that:

- the regulator can be inserted in the space provided and that subsequent maintenance operations will be sufficiently practicable;

- the upstream and downstream piping is at the same level and capable of supporting the weight of the regulator;

- the inlet/outlet flanges of the piping are parallel;

- the inlet/outlet flanges of the regulator are clean and the regulator itself has not been subject to damage during transport;

- the piping upstream has been cleaned to expel residual impurities such as welding scale, sand, paint residues, water, etc.

The normally raccomended set-up is:

2.0 INSTALLATION

Fig. 2 (Standard Regulator) Fig. 3 (Upturned Regulator)

TAB. 3 CONNECTING THE APPARATUS

IN-LINE INSTALLATION

Regulator

Sensing line

Control pressure gauge

Bleed cock

On/Off valve

The connections between the apparatus and the main piping must be made using stainless steel or cooper pipe with minimum internal diameter of 12 mm.

E5-30

INSTALLATION AT RIGHT ANGLES

TAB. 4 DETAIL OF MULTIPLE TAKE-OFF

Regulator

Sensing line

Control pressure gauge

Bleed cock

On/Off valve

E5-31

The regulator must be installed in the line with the arrow on the body pointing in the gas flow direction.

It is indispensable for good regulation for the position of the downstream pressure take-offs and the speed of the gas at the take-off point to respect the values given in tables 3 and 4 (positioning) and 5 (speed).

The pressure regulator, when installed on a reducing station, shall be installed at least according to the requirements of standard EN 12186.

All venting connections shall be connected as required by above mentioned standard.

The following is recommended so as to prevent the accumulation of impurities and condensate in the lines of the pressure take-offs:

a) the lines themselves must slope down towards the downstream piping with a slope of about 5-10%;

b) the connectors on the piping must always be welded on the top of the piping itself and there must be no burr or inward protrusions in the hole in the piping.

NB. WE RECOMMEND NOT TO PUT ON/OFF VALVES ON THE IMPULSE TAKE-OFFS

TAB. 5

The speed of the gas must not exceed the following values in the piping downstream from the regulator:

Vmax = 25 m/s for 1,5 < Pa < 4 bar

Vmax = 20 m/s for 0,5 < Pa < 1,5 bar

Vmax = 15 m/s for Pa < 0,5 bar

DOWNSTREAM VOLUME REQUIRED FOR INSTALLATION

In the case of a service regulator of the ON-OFF type (stopping or starting of burners), you should remember that though the NORVAL apparatus is classified as being of the fast reaction type, it requires an appropriately dimensioned volume of gas between the apparatus itself and the burner so as to partly absorb the pressure swings caused by fast flow rate variations.

E5-32

3.0 ACCESSORIES

3.1 RELIEF VALVE

The relief valve is a safety device which releases a certain quantity of gas to the exterior when the pressure at the control point exceeds the set-point as a result of short-lasting events such as, for example, the very fast closing of the on/off valves and/or overheating of the gas with zero flow rate demand. The release of the gas to the exterior can, for example, delay or block the intervention of the slam-shut valves for transitory reasons deriving from damage to the regulator.

Obviously the quantity of gas released depends on the extent of the overpressure with respect to the set-point.

The different models of relief valves available are all based on the same operating principle which is illustrated below with reference to the valve VS/AM 55 (fig. 4).

It is based on the contrast between the thrust on the diaphragm 24 deriving from the pressure of the gas to control and the thrust from the setting spring 20. The weight of the mobile assembly, the static thrust and the residual dynamic thrust on the obturator 4 also contribute to this contrast. When the thrust deriving from the pressure of the gas exceeds that of the setting spring, the obturator 4 is raised and a certain quantity of gas is released as a result.

As soon as the pressure drops below the set-point, the obturator returns to the closed position.

Proceed as indicated below to control and adjust intervention of the relief valve.

Fig. 4

E5-33

3.1.1 DIRECT INSTALLATION IN THE LINE (Fig. 5)

When the relief valve is fitted directly in the line that is, without the interposition of an on/off valve, we recommend proceeding as follows:

1) ensure that the downstream on/off valve V2 and the bleed cock 6 are closed;

2) increase the pressure in the downstream section to the value at which intervention should occur by connecting a controlled auxiliary pressure to the cock 6 and stabilise it at the desired value;

3)check intervention of the relief valve and adjust it if necessary by turning the internal adjustment ring 14 appropriately (clockwise to increase the set-point, anticlockwise to reduce it).

3.1.2 INSTALLATION WITH ON/OFF VALVE (Fig. 6)

1)Close the on/off valve 16;

2)connect a controlled auxiliary pressure to the take-off 17 and increase it slowly to the envisaged intervention value;

3)check the intervention of the relief valve and adjust it if necessary by turning the internal adjustment ring 14 appropriately (clockwise to increase the set-point, anticlockwise to reduce it).

Fig. 6Fig. 5

E5-34

The modular-type conception of NORVAL series regulators means that it is also possible to fit the slam-shut incorporated with the body itself even after the installation of the regulator.

Furthermore, the regulator can be adapted for operation as an in-line monitor by installing a special device.

4.1 INCORPORATED SLAM-SHUT I-N

This is a device (fig. 7) which immediately blocks the gas flow if, following some kind of failure, the downstream pressure reaches the set-point for its intervention or if it is operated manually.

The main characteristics of the slam-shut device are:

• design pressure: 18.9 bar for all the components;

• intervention with pressure increase and/or decrease;

• intervention accuracy (AG): ± 1% of the pressure set-point for pressure increases, ± 5% for pressure decreases;

• incorporated by-pass for balancing the pressures and facilitating the resetting of the device.

• push-button manual control.

4.0 MODULARITY

...+ I-N SLAM-SHUT

Fig. 7

E5-35

The slam-shut mechanism consists of:

• a mobile obturator A with sealing gaskets subject to the load of the closing spring G;

• a lever assembly L whose rotation causes the movement of the obturator A;

• a pressure switch device I-N whose internal motion determines the open or closed position of the obturator A.

The pressure switch device (fig. 8) comprises a control head 11 in which the pressure to control Pa acts on the diaphragm 21 which is integral with the shaft with cams 18.

The load of the pressure Pa on the diaphragm is contrasted by the springs 14 and 15, which respectively determine intervention for a pressure increase or decrease.

The slam-shut device is set by adjusting the rings 12 and 13.

The intervention value is increased by turning the rings clockwise and vice versa when turned anticlockwise.

In the case of intervention for pressure increase, when the Pa exceeds the set-point, the load on the diaphragm 21 of the control head B increases until it overcomes the resistance of the spring 14 .

This provokes the downward displacement of the shaft 18 which shifts the feeler 19 and releases the lever mechanism 20 by means of the cam 23.

Intervention for a pressure decrease takes place as follows.

As long as the value of Pa stays above the set load of the spring 15, the spring support 17 rests on support 16.

If the pressure Pa drops below the set-point, the support of spring 16 stops its stroke on the beat of the body 5 and the spring 15 displaces the support 17 upwards and the shaft 18 as a result. The cam 24 then shifts the feeler 19 and causes the release of the lever mechanism 20.

Intervention of the slam-shut device can also be provoked manually by means of the release button 22. The connection between the control head 11 and the Pa control point can be made with the interposition of a device (Push) fig. 14 which makes it easy to control the operation of the pressure control device.

Fig. 8a Fig. 8b

E5-36

4.2 TAB. 6 SLAM-SHUT SETTING SPRINGS

Fig. 9

2700565 WHITE 2.0 5.25 7.25 13 ÷ 33 17 ÷ 35

2700675 YELLOW 2.3 5.25 7.25 25 ÷ 50 30 ÷ 55

2700820 ORANGE 2.5 5.00 7.00 40 ÷ 85 45 ÷ 85

2700910 RED 2.7 6.00 8.00 65 ÷ 145 65 ÷ 145

2701035 GREEN 3.0 5.25 7.25 100 ÷ 180 100 ÷ 180

2701140 BLACK 35 50 3.2 4.50 6.50 150 ÷ 270 150 ÷ 270

2701255 BLUE 3.5 4.50 6.50 200 ÷ 350 200 ÷ 350

2701380 GREY 3.7 4.25 6.25 700 ÷ 1500

2701525 BROWN 4.0 4.50 6.50 300 ÷ 550 300 ÷ 550 900 ÷ 2000

2701645 VIOLET 4.2 4.00 6.00 500 ÷ 900 500 ÷ 900 1300 ÷ 2800

2702065 AZURE 5.0 4.50 6.00 850 ÷ 1200 850 ÷ 1200 2500 ÷ 5000

SETTING RANGE mbar

Springs characteristics I-N (Fig. 9) I-N (Fig. 10) I-N/TR (Fig. 9 and fig. 10)

Code Colour De Lo d i it max min max min max min

2700338 WHITE 1.3 8.75 10.75 5 ÷ 19 8 ÷ 23

2700377 YELLOW 1.5 8.50 10.50 15 ÷ 50 20 ÷ 50

2700464 ORANGE 40 1.7 8.50 10.50 45 ÷ 100 45 ÷ 100

2700513 RED 15 2.0 8.50 10.50 70 ÷ 140 70 ÷ 140

2700713 GREEN 2.3 8.50 10.50 120 ÷ 270 120 ÷ 270 150 ÷ 1550

2700750 BLACK 2.5 6.00 8.25 250 ÷ 600 250 ÷ 600 1000 ÷ 2100

2700980 BLUE 35 3.0 6.00 8.00 500 ÷ 900 500 ÷ 900 1800 ÷ 2700

2701180 BROWN 3.5 6.25 8.25

De = Ø external diameter d = Ø wire diameter i = active coils Lo = spring length it = total coils

Fig. 10

E5-37

4.3.1 CHARACTERISTICS

• Reduced dimensions;

• Easy maintenance;

• Can also be mounted on a normal regulator already installed.

4.3.2 NORVAL OPERATION WITH MONITOR FUNCTIONS

The NORVAL (fig.11) with monitor functions is a regulator which, compared with the normal version, has a further mobile assembly balancing device which guarantees greater precision in the regulated pressure and therefore an equally precise pressure intervention value without problems of interference with the main regulator. Chamber A is subject to the downstream pressure.

Fig. 11b

4.3 NORVAL FUNCTIONING AS A MONITOR

The monitor is an emergency regulator whose function is to come into service instead of the main regulator when failure of the latter causes the downstream pressure to reach the point set for monitor intervention.

PIETRO FIORENTINI has a solution for this emergency device for in-line installations.

Fig. 11a

E5-38

5.1 GENERAL

After installation, check that the inlet/outlet on/off valves, any by-pass and the bleed cock are closed.

Before commissioning, you must ensure that the conditions of use comply with the characteristics of the apparatuses.

These characteristics are recalled by the symbols on the specification plates applied to each apparatus. We recommend actuating the opening and closing valves very slowly. The regulator could be damaged by operations which are too fast.

5.0 START UP

TARGHETTE APPARECCHIATURE

E5-39

The list of symbols used and their meanings are listed below:

= Conformity to PED Directive

Pemax= maximum operating pressure at the inlet of the apparatus bpe= range of variability of the inlet pressure of the pressure regulator in normal operating conditions

PS= massima pressione che può essere sopportata in condizioni di sicurezza dalla struttura del corpo dell'apparecchio

Wa= setting range of the pressure regulator/ pilot/pre-regulator which can be obtained using the parts and the setting spring fitted at the moment of testing (that is without changing any components of the apparatus). In piloted regulators, the pilot is considered as a separate apparatus with its own setting range Wa

Wh= setting range of the pressure regulator/pilot/ pre-regulator which can be obtained using the setting springs indicated in the associated tables and also by changing some other part of the apparatus (reinforced gasket, diaphragm etc.). In piloted regulators, the pilot is considered as a separate apparatus with its own setting range Wh

QmaxPemin= maximum flow rate with minimum pressure at the pressure regulator inlet

QmaxPemax= maximum flow rate with maximum pressure at the pressure regulator inlet

Cg= experimental coefficient of critical flow

AC= regulation class

SG= closing pressure class

AG= intervention accuracy

Wao= range of intervention for the over pressure of slam-shut, relief and safety valves and accelerators which can be obtained using the setting spring fitted at the moment of testing. In piloted safety valves, the pilot is considered as a separate apparatus with its own setting range Wao

Who= range of intervention for the over pressure of slam-shut, relief and safety valves and accelerators which can be obtained using the setting springs indicated in the tables. In piloted safety valves, the pilot is considered as a separate apparatus with its own setting range Who

Wau= range of intervention for pressure decrease of slam-shut which can be obtained using the setting spring fitted at the moment of testing

Whu= range of intervention for pressure decrease of slam-shut which can be obtained using the setting springs indicated in the tables.

E5-40

5.2 GAS INPUT, CONTROL OF EXTERNAL TIGHTNESS AND SETTING

The apparatus pressurization operation must be carried out very slowly. To protect the apparatus from damage, the following operations must never be carried out:

- Pressurization through a valve located downstream from the apparatus itself.

- Depressurization through a valve located upstream from the apparatus itself.

External tightness is guaranteed if no bubbles form when a foam medium is applied on the element under pressure.

The regulator and any other apparatuses (slam-shut, monitor) are normally supplied already set for the desired set-point. It is possible for various reasons (e.g., vibration during transport) for the settings to be changed while remaining within the values permitted by the springs used.

We therefore recommend checking the settings using the procedures illustrated below.

Tables 7 and 8 give the recommended set-points for the apparatuses in the various installation arrangements. The figures in these tables can be useful both when checking existing set-points and for modifying them should this become necessary later.

In installations consisting of two lines, we suggest commissioning one line at a time, starting from the one with the lower set-point, known as the “reserve” line. The set-points of the apparatuses in this line will obviously deviate from those specified in the tables 7 and 8.

Before commissioning the regulator you must check that all the on/off valves (inlet, outlet, any by-pass) are closed and that the gas is at a temperature which will not lead to malfunction.

5.3 COMMISSIONING THE REGULATOR

If there is also a relief valve in the line, refer to par. 3.1 to check it.

1) very slowly open the inlet on/off valve V1;

2) check on the pressure gauge 5 that the pressure does not exceed the pre-established set-point, plus a tolerance of 10% due to the closing force of the regulator;

3) stabilise the upstream and downstream pressures and open the bleed cock 6;

4) check on the pressure gauge 5 that the downstream pressure is at the set-point. If it is not, adjust the setting by means of the provided screw 74 (fig. 1), turning it clockwise to increase it and anticlockwise to decrease it;

5) close the bleed cock and check the pressure set-point;

6) check the tightness of all the joints between the on/off valves V1 and V2 using a foam solution;

7) very slowly open the downstream on/off valve V2, until the line is completely filled.

Fig. 12

E5-41

5.4 COMMISSIONING THE REGULATOR WITH INCORPORATED I-N SLAM-SHUT

If there is also a relief valve in the line, refer to par. 3.1 to check it.

Check and adjust the intervention of the slam-shut 7 as follows:

A) For slam-shuts connected to the downstream piping by a three-ways deviator push valve 11, proceed as follows (Fig. 14):

- connect a controlled auxiliary pressure to path C;

- stabilise this pressure at the set-point established for the regulator;

- insert a reference pin 2 in the notch, pressing the knob 1 completely;

- reset the slam-shut device by means of the provided threaded bushing;

- keep the knob 1 pressed and:

• for safety devices which intervene for maximum pressure: slowly increase the auxiliary pressure and check the intervention value. If necessary, increase the intervention value by turning the adjustment ring 12 clockwise, or anticlockwise to reduce the intervention value.

• for safety devices which intervene for pressure increase and reduction: slowly increase the auxiliary pressure and record the intervention value. Restore the pressure to the set-point established for the regulator, and carry out the slam-shut reset operation.

Check intervention for pressure reduction by slowly reducing the auxiliary pressure.

If necessary, increase the intervention values for pressure increase or decrease by respectively turning the rings 12 and 13 clockwise and vice versa to reduce them.

- check proper operation by repeating the operations at least 2-3 times.

Fig. 13

E5-42

Fig. 14

Safety device

Chamber with controlled pressureControll position (A and C in communication)

Environment with the pressure to keep under control

Rest position (A and B in communication)

B) On devices without the "push" valve (fig. 15) we recommend connecting the control head separately to a controlled auxiliary pressure and repeating the operations described above.

Fig. 15

Safety device

Environment with the pressure to keep under control

Chamber with controlled pressure

E5-43

ATTENTION

At the end of the operation, reconnect the control head to the downstream pressure take-off.

N.B.: The intervention tests should be repeated at least every 6 months.

At the end of the slam-shut check, proceed as follows:

1) check that the slam-shut is in the closed position;

2) open the inlet on/off valve V1;

3) very slowly open the slam-shut by turning the provided lever;

4) open the downstream bleed cock 6;

5) check on the pressure gauge 5 that the downstream pressure is at the desired regulator set-point. If it is not, adjust the setting by means of the provided screw, turning it clockwise to increase it and anticlockwise to decrease it;

6) close the bleed cock 6 and check the closing pressure value;

7) using a foam medium, check the tightness of all the joints between the on/off valves V1 and V2;

8) very slowly open the downstream on/off valve V2, until the line is completely filled;

9) check that when you operate the slam-shut manually, the flow in the line stops.

E5-44

Settings of in-line apparatuses consisting of Regulator + Slam-shut + Relief valve

TAB. 7:

Regulator set-point Set-point Set-point Set-point (Pas) mbar RELIEF VALVE SLAM-SHUT Max SLAM-SHUT Min

8<Pas≤12

12<Pas≤15

15<Pas≤19

19<Pas≤24

24<Pas≤30

30<Pas≤60

60<Pas≤80

80<Pas≤110

110<Pas≤200

200<Pas≤400

400<Pas≤800

800<Pas≤1000

1000<Pas≤2500

2500<Pas≤4000

20 mbar

Pas x 1.5

Pas x 1.4

Pas x 1.25

Pas x 1.15

25 mbar

Pas + 20 mbar

Pas + 30 mbar

Pas + 40 mbar

Pas + 100 mbar

Pas + 150 mbar

Pas + 300 mbar

Pas + 500 mbar

Pas + 1000 mbar

Slam-shut not available

10 mbar

Pas -10 mbar

Pas -20 mbar

Pas -40 mbar

Pas -60 mbar

Pas -100 mbar

Pas -200 mbar

Pas -300 mbar

E5-45

5.5 COMMISSIONING THE REGULATOR PLUS NORVAL IN-LINE MONITOR WITH

INCORPORATED I-N SLAM-SHUT VALVE

If there is also a relief valve in the line, refer to par. 3.1 to check it.

Check and adjust the intervention of the slam-shut 7 as follows:

A) For slam-shuts connected to the downstream piping by a three-ways deviator push valve 11, proceed as follows (Fig. 14):

- connect a controlled auxiliary pressure to path C;

- stabilise this pressure at the set-point established for the regulator;

- insert a reference pin 2 in the notch, pressing the knob 1 completely;

- reset the slam-shut device by means of the pro-vided theaded bushing;

- keep the knob 1 pressed and:

• for safety devices which intervene for maximum pressure: slowly increase the auxiliary pressure and check the intervention value. If necessary, increase the intervention value by turning the adjustment ring 12 clockwise, or anticlockwise to reduce it.

• for safety devices which intervene for pressure increase and reduction: slowly increase the auxiliary pressure and record the intervention value. Restore the pressure to the set-point established for the regulator, and carry out the slam-shut reset operation.

Check intervention for pressure reduction by slowly reducing the auxiliary pressure. If necessary increase the intervention values for pressure increase or decrease by respectively turning the rings 12 or 13 clockwise and vice versa to reduce them.

- check proper operation by repeating the operations at least 2-3 times.

Fig. 16

E5-46

B) On devices without the "push" valve (fig. 15) we recommend connecting the control head separately to a controlled auxiliary pressure and repeat the operations described above.

ATTENTION

At the end of the operation, reconnect the control head to the downstream pressure take-off.

N.B.: The intervention tests should be repeated at least every 6 months.

At the end of the slam-shut check, proceed as follows:

1) ensure that the slam-shut is in the closed position;

2) disconnect the sensing line of the main regulator 2 and appropriately plug the connection fitting on the downstream section;

3) very slowly open the on/off valve V1;

4) very slowly open the slam-shut by turning the provided lever;

5) check on the pressure gauge 5 that the downstream pressure is at the set-point established for the monitor

1, taking account of the closing overpressure;

6) open the bleed cock 6;

7) check on the pressure gauge 5 that the downstream pressure has the established setting value. If it does not, adjust the setting by means of the special screw 74, turning it clockwise to increase its value and anticlockwise to reduce its value;

8) trip the slam-shut manually;

9) connect the sensing line of the main regulator;

10) very slowly open the slam-shut valve by turning the provided lever;

11) check on the pressure gauge 5 that the downstream pressure settles at the set-point established for the main regulator 2, taking account of the closing overpressure;

12) open the downstream bleed cock;

13) check on the pressure gauge 5 that the downstream pressure has the established setting value. If it does not, adjust the setting by means of the special screw 74, turning it clockwise to increase and anticlockwise to reduce;

14) close the bleed cock and check the value of the closing pressure;

15) check the tightness of all the joints between the on/off valves V1 and V2 using a foam medium;

16) very slowly open the downstream on/off valve V2, until the line is completely filled.

17) check that when you operate the slam-shut manually, the flow in the line stops.

E5-47

Settings of in-line apparatuses consisting of Regulator + Monitor + Slam-shut + Relief valve

TAB. 8:

Regulator set-point Set-point Set-point Set-point Set-point (Pas) mbar MONITOR RELIEF VALVE SLAM-SHUT Max SLAM-SHUT Min

8<Pas≤12

12<Pas≤15

15<Pas≤19

19<Pas≤24

24<Pas≤30

30<Pas≤60

60<Pas≤80

80<Pas≤110

110<Pas≤200

200<Pas≤400

400<Pas≤800

800<Pas≤1000

1000<Pas≤2500

2500<Pas≤4000

Pas + 5 mbar

Pas x 1.15

Pas x 1.15

Pas x 1.15

25 mbar

Pas x 1.8

Pas x 1.55

Pas x 1.4

Pas x 1.3

Pas x 1.16

30 mbar Slam-shut not available

10 mbar

Pas -10 mbar

Pas -20 mbar

Pas -40 mbar

Pas -60 mbar

Pas -100 mbar

Pas -200 mbar

Pas -300 mbar

Pas + 20 mbar

Pas + 30 mbar

Pas + 40 mbar

Pas x 1.41

Pas x 1.46

Pas x 1.4

Pas x 1.3

Pas x 1.25

E5-48

6.0 TROUBLE-SHOOTING

The problems of various kinds which could arise over time are highlighted below.

They derive from phenomena associated with the conditions of the gas as well, of course, as with the natural ageing and wear of the materials.

It must be remembered that all operations on the apparatuses must be carried out by highly qualified personnel with appropriate knowledge of the subject. Tampering with the apparatuses by unsuitable personnel relieves us from all responsibility of any kind.

You must therefore train your maintenance personnel or avail yourself of the service centres officially authorised by us.

6.1 TAB. 9 REGULATOR (FIG. 17)

Dirt Clean the parts subject to movement

Anti-pumping valve not suitable for the Adjust or replace the internal part particular type of installation

Compensating diaphragm [29] worn Replace

Incorrect assembly of diaphragm [20] Check

Operating anomalies Setting spring [41] Check and, if necessary, replace

Incorrect assembly of compensating Check diaphragm [29]

Reinforced gasket [4] with wrong Replace hardness

Incorrect sensing line take-off Change arrangement arrangement

Reinforced gasket [4] damaged Replace

No tightness at Q=0 Valve seat dented Grind or replace

PROBLEM POSSIBLE CAUSES REMEDY

E5-49

Dirt on the reinforced gasket [4] Clean

O-ring [60] worn Replace

No tightness at Q=0 O-ring [60] worn Replace

Compensating diaphragm [29] ruptured Replace

Compensating diaphragm [29] Fix improperly fixed

Reinforced gasket [4] damaged Replace

Shaft locked by incrustation during Clean start-up

Setting higher than spring limit Replace spring Pressure increase at Q>0

Diaphragm [20] ruptured Replace

Incorrect assembly of diaphragm [29] Fix

No sensing signal from take-off Check

Demand higher than regulator flow rate Replace

Pressure drop

No pressure upstream Check any line filter

6.1 TAB. 9 REGULATOR (FIG. 17)

PROBLEM POSSIBLE CAUSES REMEDY

E5-50

6.2 TAB. 10 REGULATOR SLAM-SHUT (FIG. 18)

PROBLEM POSSIBLE CAUSES REMEDY

Control diaphragm [16] ruptured Change the diaphragmSlam-shut obturator does not close

Obturator gasket [10] deteriorated Change the gasket

Leakage from slam-shut obturator O-ring [66] worn Change

Obturator seat [7] eroded or pitted Change the seat

Wrong setting of maximum and/or Make the setting again using the rings minimum spring [12] and/or [13]

Incorrect intervention pressure

Friction in lever system Change the box containing the whole assembly

Persistence of the cause which led to Decrease or increase the downstream pressure increase or decrease downstream pressure

Rearming not possible

Lever system broken or chipped Change the standard box containing the assembly outside the regulator

N.B. If the slam-shut has intervened, close the inlet and outlet valve (V1 and V2) on the line and discharge the pressure before carrying out any operation.

Eliminate the causes which gave rise to intervention before reactivating it.

In the event of operating problems when personnel qualified for a specific operation are not available, call the service centre nearest you. For further information contact our SATRI service at our Arcugnano (Vicenza) works.

E5-51

7.1 GENERAL

Periodical inspection and maintenance shall be carried out according to the regulations in force (kind and frequencies).