43 21 29.pdf

SABER Solicitation FA2517-08-R-5002

43 21 29 - 1 05/08/09

SECTION 43 21 29

FLOW MEASURING EQUIPMENT POTABLE WATER OR SEWAGE TREATMENT PLANT

PART 1 GENERAL

1.1 REFERENCES

1.1.1 The latest issue of the publications listed below and referenced to thereafter by basic designations only, forms a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

1.1.1.1 AMERICAN WATER WORKS ASSOCIATION (AWWA)

a. AWWA C700 Standard for Cold Water Meters - Displacement Type, Bronze

Main Case

b. AWWA C704 Propeller-Type Meters for Waterworks Applications

1.1.1.2 ASME INTERNATIONAL (ASME)

a. ASME B16.1 Standard for Gray Iron Threaded Fittings; Classes 125 and 250

b. ASME PTC 19.5 Flow Measurement

1.1.1.3 ASTM INTERNATIONAL (ASTM)

a. ASTM A 126 Standard Specification for Gray Iron Castings for Valves, Flanges, and Pipe Fittings

b. ASTM B 61 Standard Specification for Steam or Valve Bronze Castings

1.1.1.4 U.S. DEPARTMENT OF DEFENSE (DOD)

a. MIL-P-24441 Paint, Epoxy-Polyamide

1.2 SYSTEM REQUIREMENTS

1.2.1 The flow measuring equipment shall be as specified. The design shall permit ease of installation and shall not have any features hazardous to personnel or detrimental to the equipment. Provision shall be made to align and adequately lubricate moving parts. Interior parts shall be easily accessible for adjustment, repair, and replacement.

1.3 SUBMITTALS

1.3.1 Government approval may be required on any of the following items. Items requiring submittals shall be listed on the Submittal Register. Copies of all submittals shall be provided per the requirements in Section 01 33 00, Submittal Procedures, or as listed on the Submittal Register.

1.3.1.1 SD-03 Product Data

a. Flow measuring equipment components

43 21 29 - 2 05/08/09

b. Read-out device

1.3.1.2 SD-06 Test Reports

a. Flow measuring equipment calibration

b. Open channel test

c. Dimensional inspection report

d. Closed channel test

1.3.1.3 SD-08 Manufacturer's Instructions

a. Flow measuring equipment components

b. Submit manufacturer's written recommendation for installation and handling.

1.4 QUALITY ASSURANCE

1.4.1 Requirements

1.4.1.1 Perform calibration and submit test report for flume in variable head meter for open channel.

Submit dimensional inspection report and flow versus differential head curve for variable head meters for closed channel; accuracy shall be plus or minus 1.0 percent over a 10 to 1 flow range. Submit as required in paragraph entitled "Field Tests and Inspections."

PART 2 PRODUCTS

2.1 MATERIALS AND EQUIPMENT

2.1.1 Unless otherwise specified, all materials and equipment shall be standard commercial products in regular production by the manufacturer and suitable for the required service.

2.1.1.1 Variable Head Meter for Closed Channel

a. Shall include an orifice plate, a flow nozzle, a Venturi tube, as differential head producer, a diaphragm meter as differential measurement, and an indicator and an integrator as read-out device[s]. Remote transmission also shall be included. Meter shall be provided for potable water, plant water, water for chlorination, air for aeration, recirculated plant effluent, plant effluent, plant influent, bypass line, primary sludge, return sludge, sludge to waste, digested sludge flow where indicated.

2.1.1.2 Orifice Plate

a. Shall be of the differential producing type with circular hole, and designed for insertion in the specified pipe size where indicated. The orifice plate shall measure the specified flow. The orifice plate with a flange union to hold the plate perpendicular to the axis of the pipe shall be provided. The flange shall have a pressure rating of (125 psi) and shall have threaded ends.

The orifice plate shall be of stainless steel and shall be furnished with a tab designating line size, orifice size, and flow direction. The orifice plate shall be in accordance with recommendations of the ASME PTC 19.5, except as modified herein. The pressure taps shall

43 21 29 - 3 05/08/09 be of the flange one diameter upstream and one-half diameter downstream corner type and sized in accordance with recommendations of the ASME PTC 19.5.

2.1.1.3 Flow Nozzle

a. Shall be of the differential producing type having a modified Venturi flow nozzle contour, and designed for at least 90 percent head recovery for insertion in the specified pipe size where indicated. The nozzle shall measure the specified flow. The flow nozzle shall have (125 psi) flanged ends conforming to ASME B16.1. Construct the nozzle of cast iron conforming to

ASTM A 126, Grade B. The throat liner shall be of bronze conforming to ASTM B 61. The length of the throat liner shall be equal to 75 percent of the throat diameter. The inlet pressure tap shall be one diameter upstream and the outer pressure tap shall be one-half diameter downstream the throat type. The taps for use with sewer and sludge must have built-in capabilities for manual rodding of the holes.

2.1.1.4 Venturi Tube

a. Shall be of the differential producing type, and designed for potable water, sewage, sludge service with at least 90 percent head recovery in accordance with recommendations of the

ASME PTC 19.5 for use in the specified pipe size where indicated. The Venturi shall measure the specified flow. The Venturi shall have (125 psi) flanged ends conforming to ASME B16.1.

The laying length shall be approximately that indicated. Construct the body of cast iron conforming to ASTM A 126, Grade B. The throat section and vent bushing shall be bronze conforming to ASTM B 61. For sludge service, equip the tube with manual vent cleaners requiring not more than ( 90 degrees) rotation for full operation. For sludge service, provide a water purge system and two matched assemblies of piping, valves, rotometers, and fittings.

The purge system shall operate on a clean water supply of ( one gpm) at a regulated pressure of

( 10 psig)greater than line pressure. The Venturi interior waterways shall be finished with an anti-stick coating.

2.1.1.5 Modified Venturi

a. Shall be of the differential producing type, and designed for potable water, sewage, sludge service with at least a 90 percent head recovery for use in the specified pipe size where indicated. The Venturi shall measure the specified flow. The laying length shall be approximately that indicated. The modified Venturi shall be of the insert type constructed of fiberglass reinforced polyester. The holding flange shall be carbon steel, bronze, or fiberglass reinforced plastic with integral pressure taps for mounting between ( 125 psi) ASME B16.1 flanges.

2.1.1.6 Diaphragm Meter

a. Shall meet the indicated range, and a minimum differential of not less than (one inch). The maximum differential shall be equal to the range squared but shall not exceed (100 inches) of water column. It shall have stainless steel bellows with built-in overrange protection to prohibit deformation of the bellows. Contain the bellows in a forged brass or cadmium-plated forged carbon steel housing to withstand a working pressure of at least ( 500 psi). Transmit the output motion of the bellows to the local read-out device. There shall be zero adjustment in the diaphragm meter. Accuracy shall be plus or minus 0.5 percent of full scale over a 3 to 1 flow range.

2.1.1.7 Variable Head Meter for Open Channel

43 21 29 - 4 05/08/09

a. Shall include a weir and a flume as head producer, a stilling well with float and cable as head measurement, and an indicator or a recorder and an integrator as read-out device(s). Remote transmission also shall be included. Meter for potable water, plant influent, bypass line, plant effluent recirculation, return sludge, plant effluent flow shall be provided where indicated.

2.1.1.8 Weir

a. Shall be of the type as indicated. The weir shall measure the specified flow. The upstream face of the weir plate shall be flat and smooth. Any bolts or rivets used to fasten the plate shall be countersunk flush with the plate. Bolt holes shall include provision for adjustment of height and level. The edges of the weir plate exposed to flow shall not exceed (1/8 inch) in thickness;

where thicker plates must be used, the edge shall be beveled ( 45 degrees) or more to the required ( 1/8 inch). Make the weir plate of stainless steel or fiberglass reinforced polyester laminate containing at least 30 percent fiberglass by weight.

2.1.1.9 Parshall Flume

a. Shall be of the Parshall type, and shall measure the specified flow. The flume shall have a converging upstream section, a throat, and a diverging downstream section. The complete unit shall have vertical walls. Stilling wells and throat floor shall be inclined downward. Construct the flume of polyester resin reinforced with not less than 30 percent fiberglass by weight and provided with locking devices for engagement with the grout around the liner. Reinforcing ribs shall be an integral part of the flume while removable bracing shall be provided to ensure proper maintenance of liner dimensions during shipment and installation.

2.1.1.10 Flume

a. Shall be of the characterized type, and shall measure the specified flow. The flume shall have a cast iron measuring section having a circular inlet and a characterized outlet. The inlet line size shall be as indicated on plans. The inlet shall be ASME B16.1, 862 ( 125 psi), flanged. The flume shall have a flat invert free from pockets and obstructions. Equip the flume with a manual vent cleaner and sediment trap.

2.1.1.11 Float and Cable

a. Shall meet the indicated range with the specified head measurement. Measure the crest level in a stilling well as indicated. The measuring system shall include a float, cable, drum, transfer gear assembly, and cam mechanism to provide uniformly graduated units of flow. The float shall be of polyester, stainless steel, or copper, and of a weight and shape that conform to the application requirements. The cable shall be plastic-coated multi-strand stainless steel, stainless steel beads, or multi-strand monel. Groove the drum to prevent overlapping of the cable. The float and cable with stops to prevent overranging and to provide a zero adjustment shall be provided. All materials of construction shall be corrosion-resistant. Protection tubes for the cables shall be provided. Accuracy shall be plus or minus 2 percent of the actual rate over a 5 to 1 range.

2.1.1.12 Variable Area Meter for Open Closed Channel

a. A variable area meter shall be provided as indicated. Make the variable area meter of a tapered tube with a float that shall indicate a flow range as specified. The tube shall be glass with flow units etched on it and shall be placed vertically for reading. It shall consist of fiberglass, 43 21 29 - 5 05/08/09 stainless steel, or aluminum with stainless steel fitted ends and fluorinated hydrocarbon rubber or chloroprene 0-rings. The float shall be stainless steel and easily read. The metering tube shall be easily removed for range change or cleaning without tools or removing the meter from the line. A needle valve for adjusting flow shall be provided where indicated. Accuracy shall be plus or minus 5 percent over a 3 to 1 range.

2.1.1.13 Propeller Meter

a. A propeller meter shall be provided where indicated. The meter shall measure the velocity and convert it to flow units. The meter shall meet the specified range for use in the indicated pipe size. Materials shall conform to the applicable requirements of AWWA C704. The propeller meter shall be of the saddle type for a working pressure of ( 125 psi) and be supplied with a steel welding saddle and separate straightening vanes. The propeller meter shall be of the tube type for a working pressure of ( 125 psi) and be furnished complete with a tube, built-in straightening vanes, and ( 125 psi) ASME B16.1 flanged ends, or threaded connections, as appropriate for the pipe. The meter head with a conical shaped three-blade propeller mounted transversely in the line shall be provided. The meter shall be completely sealed from water pressure and able to withstand thrust on the front of the propeller. Accuracy shall be plus or minus 2 percent of actual rate over a 10 to 1 range.

2.1.1.14 Electromagnetic Meter

a. A magnetic flow meter shall be provided where indicated. The magnetic flow meter shall measure the specified flow and be suitable for the indicated pipe size. The magnetic flow meter system shall include a flow tube, local read-out receiver, [remote transmission,] and interconnecting cable where indicated. The flow meter shall be a [tetrafluoroethylene-lined stainless steel or steel] [chloroprene-lined stainless steel or steel] [polyurethane-lined stainless steel or steel] [vitreous enamel-lined stainless steel or steel] [glass-lined stainless steel or steel]

[tetrafluoroethylene-lined aluminum] [fiberglass] tube with the necessary cores and coils to provide a magnetic field without any interference and with (150 psi) [modified ASME B16.1 carbon steel flanges] [Dresser type coupling] [Victaulic type couplings] [integral fiberglass flanges]. Electrodes shall be of stainless steel. The tube shall operate at the specified voltage and frequency, single-phase ac power. A weatherproof housing shall cover the magnets, coils, and connections. A transformer within the transmitter housing to provide 120 volts power to the receiver shall be provided. A system for cleaning the electrodes or tube automatically without taking the tube out of service. Automatic mechanical cleaning of electrodes or tube shall not be acceptable. The metering tube shall have an approximate laying length as indicated. All necessary cable between the transmitter and receiver. Accuracy shall be plus or minus one percent over a 10 to 1 range. The receiver shall convert the ac voltage signal generated in the flow tube to a uniform flow signal. There shall be an adjustment for zero and span.

2.1.1.15 Volumetric Meter

a. A volumetric meter shall be provided where indicated. The meter shall conform to AWWA

C700. The meter shall be of the rotating-disc type for use in the indicated pipe size and shall be of the frostproof type, if applicable.

2.1.1.16 Ultrasonic Meter

a. An ultrasonic meter shall be provided where indicated. The meter shall have a velocity range of 0 to 20 feet per second for use with the indicated pipe size. The flow meter shall consist of

43 21 29 - 6 05/08/09 separate transmitting and receiving transducers clamped to the outside of the pipe to measure the liquid flow without, in anyway, intruding into or altering the pipe. The primary element employing a single pair of electro-acoustic transducers mounted diagonally in a flow tube, and in direct contact with the liquid flow to be measured a single transducer with twin crystals encapsulated in an epoxy housing mounted on the outside of the pipe. The transmitting crystal shall emit a continuous ultrasonic pulse or frequency into the liquid stream to be reflected back to the receiving crystal. It shall measure the difference in frequencies which is proportional to the liquid flow. The transmitter shall contain all necessary circuitry enclosed in nema 4

[indoor] [outdoor] housing suitable for wall/panel mounting and connected to the transducers by the indicated length of cable. It shall produce an accurate 4 to 20 ma dc signal linear with flow rate. It shall provide linearity of plus of minus 0.5 percent and repeatability of 0.1 percent under simulated flow. Long term drift of the pulse rate output shall be less than 0.1 percent. It shall operate with 115 or 230 volt plus or minus 10 percent, 50 or 60 hz electrical power. The unit shall function over an ambient temperature range as indicated for both indoor and outdoor applications. The flow rate indicator shall be integrally mounted in the transmitter housing.

Graduate 6 inch scale length in fps/gpm.

2.2 READ-OUT DEVICE

2.2.1 The meter with the following read-out device shall be provided which shall read at the indicated flow range.

2.2.1.1 Local Read-Out

a. [an indicator] [a recorder] [and an integrator] shall be provided for local read-out of flow. The scale graduation shall be [uniform] [square root]. The read-out shall be visible through a shatterproof clear window. The read-out mechanism shall not be affected by the intended end use environment. The unit shall be non-corrosive and weatherproof or provided with a separate weatherproof housing with a sealed door for access to the mechanism, and designed to prevent the accumulation of moisture or fog inside the case. A suitable mounting shall be provided.

2.2.1.2 Local Read-Out and Remote Transmission

a. Shall be as indicated and provided for local read-out and transmission of flow data to remote read-out. The scale graduation shall be [uniform] [square root]. The read-out shall be visible through a shatterproof clear window. The read-out and transmission mechanism shall not be affected by the intended end use of environment. The transmission shall be impulse duration type or milliampere dc analog signal type to the remote read-out. Actuate all transmission by the output motion or the ac voltage signal of the meter. Power required shall be as indicated.

When impulse duration type transmission is used, the system shall have a 15 second maximum cycle actuating a cam-operated contact. The contact shall be of the totally-enclosed type. The unit shall be non-corrosive and weatherproof or provided with a separate weatherproof housing with a sealed door for access to the mechanism, and designed to prevent the accumulation of moisture or fog inside the case. A suitable mounting shall be provided.

2.2.1.3 Indicator

a. Shall be a minimum of ( 6 inches) long.

2.2.1.4 Recorder

43 21 29 - 7 05/08/09

a. Shall be a minimum of 10 inches in diameter and shall rotate as specified. The chart drive shall be driven by a synchronous motor as indicated.

2.2.1.5 Integrator

a. Shall read the total flow in the units specified using only a whole power of 10 multiplier.

2.2.1.6 Remote Read-Out

a. [an indicator] [a recorder] [and an integrator] shall be provided for remote read-out of flow.

The scale graduation shall be [uniform] [square root]. The read-out shall accept the signal output and be of the same range and flow units as the local read-out and remote transmission device. The signal shall actuate an electro-mechanical receiver in which the input duplicates the output of the remote transmission device. Ac or dc power supply shall be provided, if required. The read-out shall be visible through a shatterproof clear window. The read-out shall not be affected by the intended end use environment. The unit shall be weatherproof or provided with a separate weatherproof housing with a sealed door for access to the mechanism, and designed to prevent the accumulation of moisture or fog inside the case. A suitable mounting shall be provided.

2.2.1.7 Remote Read-Out Indicator

a. Shall be a minimum of ( 6 inches) long.

2.2.1.8 Remote Read-Out Recorder

a. Shall be a minimum of (10 inches) in diameter and shall rotate as specified. The chart drive shall be driven by a synchronous motor as indicated.

2.2.1.9 Remote Integrator

a. Shall read the total flow in the units specified using only a whole power of 10 multiplier.

2.3 ELECTRICAL REQUIREMENTS

2.3.1 Unless indicated or specified otherwise, the electrical components of the meters, such as chart drives and electrical disconnecting (isolating) means, are included under this section. Wiring for signal circuit shall be provided as specified by the equipment manufacturer. The interconnecting conduit and wire (except when otherwise specified herein, or when included in factory-assembled equipment) and the electrical connection of the meters to the electrical power circuit are specified in Division 16.

2.4 SPARE PARTS

2.4.1 All standard recommended spare parts shall be provided as specified in the manufacturer's instruction manuals for each component in the system. Furnish one year's supply of charts and ink for each recording device.

PART 3 EXECUTION

3.1 MATERIALS PROTECTION

43 21 29 - 8 05/08/09

3.1.1 The entire tube, except the throat section of the [flow nozzle] [Venturi] [characterized flume], shall receive a series of coats of paint conforming to MIL-P-24441. Apply the paint in the following order: one coat of Formula 150, one coat of Formula 151, one coat of Formula 156, and one coat of Formula 152. The final total dry-film thickness shall be not less than ( 10 mils).

Furnish all other items in accordance with the manufacturer's standard practice suitable for end use environment.

3.2 INSTALLATION

3.2.1 Furnish the services of an engineer representative of the manufacturer of the flow measuring equipment for checking the installation, making the necessary adjustments and calibrations, placing the equipment in operation, and performing the acceptance tests. The representative also shall be available for not less than 2 days to instruct operating personnel in the use, operation, and maintenance of the equipment during the initial operating period. Install all flow measuring equipment in accordance with the recommendations of the manufacturer. Install variable head meter[s] for closed channel[s] in accordance with the ASME PTC 19.5. Install weir[s] with the top exactly level at the elevation indicated.

3.3 FIELD TESTS AND INSPECTIONS

3.3.1 Test and calibrate in place the flow measuring equipment to demonstrate that it meets the accuracy requirements for the full range of flows specified herein. All labor, equipment, and incidentals shall be provided required for the tests, including electric power and water required for tests. The Contracting Officer shall witness all field tests and conduct all field inspections.

The Contractor shall give the Contracting Officer ample notice of the dates and times scheduled for tests. Rectify any deficiencies found and retest work affected by such deficiencies at the

Contractor's expense. Record data from each field test shall be recorded and documented in a formal field test report.

END OF SECTION 43 21 29