Dresser RCS Інструкція з експлуатації - Сторінка 7

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1. Maintenance/Replacements

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4. Turn drive shaft by hand to make sure impellers still

rotate without bumping or rubbing at any point.

5. Make sure oil levels in the main oil sumps are correct.

6. Check lubrication of driver. If it is an electric motor, be

sure that power is available and that electrical overload

devices are installed and workable.

7. Open the manual unloading valve in the discharge air

line. If a valve is in the inlet piping, be sure it is open.

8. Bump blower a few revolutions with driver to check

that direction of rotation agrees with arrow near

blower shaft, and that both units coast freely to a stop.

After the preceding points are cleared, blower is ready

for trial operation under "no-load" conditions as set up

under Item 7. The following procedure is suggested to

cover this initial operation test period.

a. Start blower, let it accelerate to full speed, then shut

off. Listen for knocking sounds, both with power on

and as speed slows down.

b. Repeat above, but let blower run 2 or 3 minutes. Check

for noises, and vibrations of .005 in. (.13 rum) or

greater.

c. Operate blower for about 10 minutes unloaded. Check

oil levels. Feel cylinder and headplate surfaces for

development of spots too hot to touch, indicating im-

peller rubs. Be aware of any noticeable increase in

vibration.

Assuming that all trials have been satisfactory, or

that necessary corrections have been made, the blower

should now have a final check run of at least one hour

under normal operating conditions. After blower is

TROUBLE SHOOTING CHECKLIST

TROUBLE

No Air Flow

Low capacity

Excessive Power

Overheating of

Bearings or Gears

Vibration

ITEM

POSSIBLE CAUSE

Speed too low

Wrong rotation

Obstruction in piping

Speed too low

Excessive pressure

Obstruction in piping

Excessive slip

Speed too high

Pressure too high

Impellers rubbing

Inadequate lubrication

Excessive lubrication

Excessive pressure

Coupling misalignment

Excessive belt tension

Misalignment

Impellers rubbing

Worn bearings/gears

Unbalanced or rubbing

impellers

Driver or blower loose

Piping resonances

REMEDY

Check by tachometer and compare with speed

shown on Roots Order Acknowledgement.

Compare actual rotation with Figure 1 and ar-

row on blower. Compare driver if wrong.

Check piping, screen, valves, silencer, to assure

an open flow path.

See item 1. If belt drive, check for slippage and

readjust tension.

Check inlet vacuum and discharge pressure,

and compare these figures with specified

operating conditions on Order.

See item 3.

Check inside of casing for worn or eroded sur-

faces causing excessive clearances.

Check speed and compare with Roots Order

Acknowledgement.

See item 5.

Inspect outside of cylinder and headplates for

high temperatures areas, then check for im-

peller contacts at these points. Correct blower

mounting, drive alignment.

Restore correct oil levels in main oil sumps.

Check oil level. If incorrect, drain and refill with

clean oil of recommended grade.

See item 5.

Check carefully. Realign if questionable.

Readjust for correct tension.

See item 14.

See item 10.

Check gear backlash and condition of bearings.

If lateral rotor play exceeds .0lD in. (.25 rum)

replace gears and bearings.

Scale or process material may build up on cas-

ing and impellers, or inside impellers. Remove

build-up to restore original clearances and im-

peller balance.

Tighten mounting bolts securely.

Determine whether standing wave pressure

pulsations are present in the piping. Refer to

Sales Office.