Part A

Operation and maintenance instructions

Starting (the centrifugal pump and axial-plunger pump)

1) Open the suction check valve wide, opening at the same time the air vent on the top side.

2) Close the air vent as soon as liquid flows out of it.

3) Start the motor leaving the discharge valve closed.

4) Check that direction of rotation is as indicated by the arrow.

5) Slowly open the discharge check valve until operating requirements are reached.

6) Check on the ammeter that power requirements do not exceed the motor possible rating.

7) Check tightness of the packing gland. Leaks must be reduced to a few drops it is required to prevent harmful heating of the packing and the shaft.

During operation

The pump output is to be controlled by operating on the discharge valve and never on the suction valve which must always remain wide open.

Stopping

After switching off the motor close the suction and the discharge valves of the pump.

Part B. Translate the following sentences into Russian.

1. Check the wear of internal pans by throttling the suction valve at the pump and noting the amount of vacuum pulled by the pump. 2. If neither steam nor power is available, move the pump by hand. 3. It may be necessary to renew the gears, the casing or the gaskets which are sometimes fitted between the casing flanges. 4. Have you checked all clearances? If you’ve done it, renew worn parts if necessary. 5. It looks like complete failure of the starboard circulating pump, the jacket water temperature is very high.

Exercise 6. Discuss the causes and remedies of the most common troubles with the pumps