HB-244_02_(FRV40-225-005-010)_Bearings _Lineshaft_and_Thrust _Model_SKF_and_Michell_Bearing_(pages_76_-_106).pdf

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Operatmn & Maintenance Instructions for Mam Thrust & Journal Beanngs

OM1 1666

18.1 General I

Before carrying out any maintenance or inspection work, switch off machinery. Lock off the controls and secure and the isolate shaft.

A Ensure control gear, barring gear and any other equipment capable of moving the shaft is locked out and labelled "Not to be used'; or similar.

A DO not touch any moving parts.

18.2 Tools and Equipment

The following tools and equipment may be necessary to carry out maintenance on the bearing:

0 Allan key set

Wrenchmg key set

Openjawed spanner set

Feeler gauges.

Emery paper, plain scraper

Lifting equipment

Permanent sealing compound (e.g. Curil-T)

0 Liquid screw locking compound (e.g. LOCTITE 242)

PTFE sealant tape.

Oil with the viscosity indicated (see bearing inspection plate)

Detergents

Clean doth

Operation & Maintenance lnstmct~ons for Main Thrust & Journal Bearmgs

18.3 Maintenance Schedule 1

For a bearing that is operating constantly, routine maintenance should take place annually.

If the user only operates the bearing periodically, maintenance periods may be able to take place less frequently. This is however, at the users' d~scretion. An annual inspection is recommended as a minimum service requirement

A basic guide to maintenance is given in Table 8.

Maintenance work Schedule

Oil Change (see Section 7.4)

These are estimates only, and frequency may alter depending on site environment.

Michell can advise the user accordingly.

Exterior cleaning of the bearing I every 100-1000 hours every 5000 operating hours.

Bearing Inspection During preventatwe marntenance work for machine or immediately if:

Bearing temperature exceeds 10°C over the indicated value (see calculations)

Unusual noises or odours occur

Unusual changes in the oil colour are vis~ble.

Inadmissible vibrations occur. . Oil flow rates and oil inlet pressure readings drop below admissible values, where applicable.

Water flow rate readings drop below admissible values, where applicable

Table 8: Maintenance Schedule

Ooerat~on & Maintenance Instructions for Main Thrust & Journal Bearines

18.4 Oil Change 1

1 8.4.1 General

Oil changes will be at differing periods depending on the frequency of bearing operation and the condit~ons in which the bearing is operating. Approximate oil change times are ind~cated in Section 7.3.

Please observe the instructions for the use o f the lubricating oil. The manufacturer can provide information on waste oil disposal.

A Risk o f Pollution:

18.4.2 Procedure for draining oi l 1

Run the bearing to warm up the oil. This will ease the flow of oil from the bearing, and also remove any impurities and residues.

Shut down the machine and secure it against unintended operation.

Loosen and remove the drain plug and washer, and fully drain the bearing of oil.

0 Beware hot oil.

0 Collect and dispose o f used oi l under the correct regulations.

If the o i l is visibly altered in colour, o r contains unusual residues, an inspection is recommended to eliminate the cause.

Once all oil has drained from the bearing, replace the drain plug and washer.

18.4.3 Procedure for refilling the bearing -self contained bearings

Remove the air vent in top door.

Pour the correct grade of lubricating oil into the filling hole in the top door.

Let the oil settle into the bearing. Check the oil level to the oil dip rod. . When level is correct, replace the air vent.

Operailon & Matntenance lnstmct~ons for Mam Thrust & Journal Bearrnns

9.1 General I

The Procedure given in this section describes in detail the procedure for conducting major maintenance procedures. The procedure covers the removal and inspection of all thrust pads and journal bush allowing also removal and inspection of meter ring pistons.

Any technical queries can be referred to the Engineering Team at Michell.

9.2 Preparation I

Check through the safety procedures at the start of Section 2. Understand and follow the instruciions very carefully.

Before commencing work on the bearing ensure that the thrust shaff is in mid axlal clearance position, hence the thrust pads are unloaded.

0 Make sure the workspace is clean. Contamination and damage to the bearing affect operating performance and could lead to premature failure.

A DO not use any violence o r force.

9.3 Removing the connections 1

Switch off, drain and disconnect cooling system. Refer to manufacturer instructions.

Drain oil from the bearing as described in Section 8.4.

Disconnect and remove RTD instrumentation.

19.4 Removing the oi l scraper I

Remove screws and remove top door and gasket.

Remove screws and remove weir door and gasket

Remove scraper.

Remove screws and lift out oil guide tray

19.5 Removing the Casing Top I

Unscrew stop screws from casing top.

Remove screws and remove half retaining rings.

Carefully withdraw outer seals and slide along shaft to a safe place.

A Do not use excessive force and damage lip of seal.

Remove lantern rings and carefully withdraw inner seals and slide along shaft to a safe place.

Operation & Maintenance lnst~ctions for Main Thrust & Journal Bearings

. Remove oil diprod.

Attach lifting equipment to shackles and take up the slack.

Remove casing joint screws and positioning dowel pins.

A Follow lifting instructions andsafety guidelines in Sections 2 and 3.

Slowly and gently separate casing top from the bottom, taking care not to damage the casing bottom. Store in a convenient but safe place. The top half journal bush is now visible.

0 When separating the casing top from the bearing assembly, ensure that i t does not damage the retaining rings.

19.6 Removing the Top Half Retaining Rings. I

Remove the joint cap screws.

Lift upper thrust assemblies clear of bearing using lifting holes provided

19.7 Removing the Bottom Half Retaining Rings I

Both bottom half thrust assemblies can be removed by rotating out of the casing bottom.

Lifting hoks and toggle holes around the periphery of the ring are provided for this purpose.

fa Take care not to damage whitemetal thrust p a d surfaces.

19.8 Disassembly of Half Retaining rings 1

Remove screws from outer pad stops.

Remove outer pad stops and lift thrust pads from retaining ring.

Remove equalising segments. Note the orientation of how the segments are arranged for reassembly.

Remove screws and disc liners from retaining ring.

9.9 Removing the Top Half Bush I

Remove joint dowels and cap screws securing top and bottom half bushes together.

Lift top half bush clear of shaft using lifting holes provided.

19.10 Removing the Bottom Half Bush I

0 Take care not to jam hands when manipulating bush around shaft.

Operat~on & Mamtenance lngruct~ons for Ma~n Thrust & Journal Bearings

Jack up the shafl to the point where the shafl and the bottom half-bush are no longer in contact.

A Ensure that the jacking equipment i s safely positioned and cem'fied to carry a load greater than the mass o f the shaft.

Once the shaft is raised secure i t into position using other equipment. Do not rely on the jacking equipment alone.

Fit eyebolts to tapped holes at joint of the bottom half bush, attach suitable straps to eyebolts using shackles on one side of the bottom half bush. Gently pull on the strap wh~lst pushing down on the opposite side of the bush and rotate the bush Insert a bar into the exposed toggle hole. Continue to rotate the bush until the bush is on top of the shafl Fit eyebolts to the lifting holes and remove from the shaft.

A Use mechanical devices if possible, otherwise this stage may require some manual handling. Remember to bend the knees and not the back.

0 Take care not to damage the bush running surfaces.

19.11 Removing the Water Cooler 1

If it is necessary to clean the cooler, remove the cooler assembly.

Remove screws and withdraw doors and cooler assembly from casing bottom

Remove cooler door gaskets.

Unscrew backnuts fram cooler header connections.

Gently remove cooler from cooler doors.

When handling the cooler take care not to damage if, as this will affect cooler performance.

9.12 Removing the Casing Bottom I

Remove shaft.

Attach lifling eyes to the tapped holes in casing bottom joint face, as described in Section

3.4.

Attach lifling equipment and gently take up the weight of the casing. . Undo the holding down mounting bolts and remove.

Gently manipulate the casing bottom away from the machine.

Owration & Maintenance lnstruct~ons for Main Thrust & Journal Bearings

10.1 General

A Only use non-aggressive detergents such as VALVOLINE 150 or Alkaline cleaning compounds with pH-value 6 to 9, and a short reaction time.

A Please observe the instructions for use of the detergents.

A There may be fumes given o f f during the cleaning process. Clean parts in a well-ventilafed area. Always follow cleaner manufacturers'instructions.

0 Use a lint free cloth when cleaning the bearing. Thread from such cloths couldget into the lubricating oi l and cause overheating, and in extreme cases, failure o f the bearing.

. Clean the following parts thoroughly:

1. Casmg Top

2. Casing Bottom

3. Bush Halves

4. Thrust pads.

5. Retaining ring

6. Cooler assembly

7. seal@), where applicable

In addition inspection may be required on the bearing components, accordmg to the

Maintenance Schedule outhned in Section 8.3.

The remaining part of this section gives basic inspection guidelines for some major bearing components. However, if any wear or damage is evident on any of the bearing components, consult Michell Bearings immediately as it may adversely affect bearing performance.

The following sections assume the bearing has been d~smantled according to Section

9.

Operat~on & Maintenance Instructtons for Mam Thrust & Journal Bear~ngs

110.2 Checking the Thrust pad and Half Bushes

Examine the journal bushes. The appearance of the running surface should be that shown in Figure I 1 below.

Direction of Rotation - Dull Finish Matt Surface

Figure 11: Journal Bush Awearance Afler Use

Examine the thrust pads. The appearance of the running surface should be that shown in

Figure 12 below.

Direction of Rotation

F~gure 12. Thrust Pad Appearance

There may be some scoring and wear on the bushes and thrust pads. Provided wear is no greater than 0.125mm the components are still serviceable. If there is any sign of the bearing surface coming away from the backing material, the bush and pads must be replaced.

Inspect the collar surface for any signs of damage. If it is necessary to change pads or bushes, the collar should be repaired, othenvise the replacement parts may only have a short life.

Operation & Ma~ntenance lnstruct~ons for Mam Thrust & Journal Beanngp

110.3 Checklng the Water Cooler. 1

If necessary, clean the outside of the cooler with a wire brush

Clean the bore of the tubes if necessary using a high pressure water jet or steam cleaning.

Any remaining deposits or blockages can be removed using a cleaning rod or hypochlorite cleaning solution.

A There may b e fumes given of f during the cleaning process. Clean parts in a well-ventilated area. Always follow cleaner manufacturers' instructions.

0 When using cleaner rods, take care no t to damage the cooler tubes.

10.4 Miscellaneous I

Examine sealing on all plugs and connections. If leaks are evident, remove and renew the seal as necessary.

Qperatim & Mamtenance Instruct~ons for Mam Thrust & Journal Beanngs

I11 .I Before Installation I

Make sure bearings are stored in the irrtended mounting position, in a dry room only.

111.2 Corrosion Protection for Standstill Periods up to 6 Months

If the bearing is to be profected from corrosion, use the following procedure:

Dismantle the bearing (see Section 9).

Clean the bearing (see Section 10).

Paint or spray the casing top. the casing bottom and the shaft with TECTYL 511

Assemble the bearing (see Section 5).

Plug all connection holes.

Use Self adhesive, permanent tape to seal the gaps between the shaft, baffle, seal and casing.

Put a bag of desiccant (silica gel) inside to absorb humidity and prevent the formation of condensat~on in the bearing.

111.3 Corrosion Protection for Standstill Periods between 6 Months to 1 Year I

* Repeat the presewation procedures detailed in Section 11.2.

(11.4 Corrosion Protection for Standstill Periods longer than 1 year I 0 Dismantle the bearing according to Section 9.

Preserve and store bearing parts separately.

Operation & Mamtenance Instructions for Mam Thrust & Journal Bearmgs

112.1 Ordering Spares i

As a minimum, it is recommended that replacements should be carried for all Whitemetal components. Consideration should also be given to stocking the parts listed below:

Jointing compound (i e. Curil-T) - RTD Assemblies

Seals and Gaskets.

112.2 Table of Torque's:- 1

Bolt Size (mm) I Tightening Torque (Nm)

Plug Size (Inches) Tightening Torque (Nm)

G318 1 30

The Metric System and Equivalents

Linear Measure Liquid Measure

1 centiliter = 10 milliters = .34 fl. ounce 1 centimeter = 10 millimeters = .39 inch 1 deciliter = 10 centiliters = 3.38 fl. ounces 1 decimeter = 10 centimeters = 3.94 inches 1 liter = 10 deciliters = 33.81 fl. ounces 1 meter = 10 decimeters = 39.37 inches 1 dekaliter = 10 liters = 2.64 gallons 1 dekameter = 10 meters = 32.8 feet 1 hectoliter = 10 dekaliters = 26.42 gallons 1 hectometer = 10 dekameters = 328.08 feet 1 kiloliter = 10 hectoliters = 264.18 gallons 1 kilometer = 10 hectometers = 3,280.8 feet

Square Measure Weights

1 sq. centimeter = 100 sq. millimeters = .155 sq. inch 1 centigram = 10 milligrams = .15 grain 1 sq. decimeter = 100 sq. centimeters = 15.5 sq. inches 1 decigram = 10 centigrams = 1.54 grains 1 sq. meter (centare) = 100 sq. decimeters = 10.76 sq. feet 1 gram = 10 decigram = .035 ounce 1 sq. dekameter (are) = 100 sq. meters = 1,076.4 sq. feet 1 dekagram = 10 grams = .35 ounce 1 sq. hectometer (hectare) = 100 sq. dekameters = 2.47 acres 1 hectogram = 10 dekagrams = 3.52 ounces 1 sq. kilometer = 100 sq. hectometers = .386 sq. mile 1 kilogram = 10 hectograms = 2.2 pounds 1 quintal = 100 kilograms = 220.46 pounds Cubic Measure 1 metric ton = 10 quintals = 1.1 short tons

1 cu. centimeter = 1000 cu. millimeters = .06 cu. inch 1 cu. decimeter = 1000 cu. centimeters = 61.02 cu. inches 1 cu. meter = 1000 cu. decimeters = 35.31 cu. feet

Approximate Conversion Factors

To change To Multiply by To change To Multiply by inches centimeters 2.540 ounce-inches newton-meters .007062 feet meters .305 centimeters inches .394 yards meters .914 meters feet 3.280 miles kilometers 1.609 meters yards 1.094 square inches square centimeters 6.451 kilometers miles .621 square feet square meters .093 square centimeters square inches .155 square yards square meters .836 square meters square feet 10.764 square miles square kilometers 2.590 square meters square yards 1.196 acres square hectometers .405 square kilometers square miles .386 cubic feet cubic meters .028 square hectometers acres 2.471 cubic yards cubic meters .765 cubic meters cubic feet 35.315 fluid ounces milliliters 29,573 cubic meters cubic yards 1.308 pints liters .473 milliliters fluid ounces .034 quarts liters .946 liters pints 2.113 gallons liters 3.785 liters quarts 1.057 ounces grams 28.349 liters gallons .264 pounds kilograms .454 grams ounces .035 short tons metric tons .907 kilograms pounds 2.205 pound-feet newton-meters 1.356 metric tons short tons 1.102 pound-inches newton-meters .11296

Temperature (Exact)

°F Fahrenheit 5/9 (after Celsius °C temperature subtracting 32) temperature