Frick RWF II 100 Скачать руководство пользователя

Страница: 40 / 78

070.610-IOM (JUL 21)

Page 40

RWF II Rotary Screw Compressor Units

Maintenance

evidence of drag or contact in pump and increase

clearance where necessary

6. Rapid Wear.

a. Examination of a pump that has gradually lost its

ability to deliver capacity or pressure would show a

smooth wear pattern on all parts. Rapid wear shows

up as heavy grooving, galling, twisting, breaking, or

similar severe signs of trouble.

Preventive maintenance

Performing a few preventive maintenance procedures will
extend the life of your pump and reduce the cost per gal

lon pumped.

1. Lubrication

- Grease all zerks after every 500 hours of

operation or after 60 days, whichever occurs first. If ser

vice is severe, grease more often. Do it gently with a hand
gun. Use #2 ball bearing grease for normal applications.
For hot or cold applications, use appropriate grease.

2. Packing adjustment

- Occasional packing adjust

ment may be required to keep leakage to a slight weep; if
impossible to reduce leakage by gentle tightening, replace
packing or use different type. See Technical Service
Manual on particular model series for details on repacking.

3. End clearance adjustment

- After long service the

running clearance between the end of the rotor teeth and

Maintenance schedule

Follow this schedule to ensure trouble-free operation of the compressor unit.

Table 12: Maintenance schedule

c. Check alignment.

d. May have a bent shaft or rotor tooth. Straighten or

replace.

e. May be a foreign object trying to get into the pump

through the suction port.

4. Pump not up to capacity

a. Starving or cavitating - increase suction pipe size or

reduce length.

b. Strainer partially clogged - clean.

c. Air leak in suction piping or along pump shaft.

d. Running too slowly - is motor the correct speed and

is it wired up correctly

e. Relief valve set too low or stuck open.

f. Pump worn out.

g. Tighten end clearance.

h. Head position incorrect.

5. Pump takes too much power.

a. Running too fast - is correct motor speed, reducer

ratio, sheave size, etc. being used.

b. Liquid more viscous than unit sized to handle - heat

the liquid, increase the pipe size, slow the pump down,

or get a bigger motor.

c. Discharge pressure higher than calculated - check

with pressure gauge. Increase size or reduce length

of pipe, reduce speed (capacity), or get bigger motor.

d. Pump misaligned.

e. Extra clearance on pumping elements may not be

suffi cient for operating conditions. Check parts for

a. Check bolts, shim packs, center inserts, keys, and all bolt torques.

b. Check and torque all terminals in the processor and starter panel per the specification posted in the enclosure.

c. Check calibration of slide valve, slide stop, pressures and temperatures. Calibration should be conducted with NIST certified devices.

d. Verify tightness of bolts on suction and discharge flanges. See

Table 13

for torque requirements.

e. Vibration measurement must be carried out continuously to obtain optimum preventive control on bearings. If not continuously controlled,

then every 6 months, more frequently if levels increase. See additional notes in

Maintenance program

section below.

f. Units with variable speed drives - check for excess vibration and skip frequencies anytime unit operating conditions change.
g. The filter may need to be changed more frequently based on differential pressure or as directed by oil analysis.

h Refer to

070.210-IB

for foot mounting alignment.

Frequency or hours of operation (maximum)

Task description

200

1000

5000

8000

,000