船舶動力英語（簡體書）

1. Foundation
The foundation of marine pumps is a steel base frame. Ensure the foundation has set hard before mounting the pump set. The surface must be smooth and flat. Position the pump on the steel base frame or foundation, then align and bolt in position.
2. Alignment of Pump and Driver
After fitting and bolting on the driver, centre it in the flange.
3. Connecting the Piping
Never use the pump as an anchorage point for the piping. The pipes must be supported very near the pump and connected to the pump without transmitting any stresses or strains to it. Make sure the pump does not bear the weight of the piping. The nominal bore of the pipes should be the same as or greater than that of the pump nozzles. The suction pipe must not have any valves, fittings etc. , which might interfere with the flow, at a distance of not less than 5 times the suction pipe bore from the pump,to ensure uniformity of flow to the impeller.
4. Coupling Guard
Safety regulations specify that the pump can only be operated if the coupling has a guard. The coupling guard must be fitted before startup.
5. Final Check
It must be possible to rotate the rotor easily by manually turning the coupling through 360°. Ensure all auxiliary lines are correctly connected up.
6. Maintenance
(1)The pump must run quietly, smoothly and free from vibrations at all times. Rough running can cause damage to the bearings and shaft seal.
(2) The pump must never run dry.
(3) The temperature of the ball and roller bearings may rise to 50 ℃ above ambient temperature but must not exceed 80 ℃. The shut-off valves in the various supply lines must not be closed during operation.
(4) Standby pumps must be started-up from time to time to ensure that they are in a state of constant readiness; also rotate the shaft by hand at frequent intervals.
(5) A sealant reservoir for the mechanical seal should always be filled with water containing a washing up liquid.
(6) Lubricate the pump as described in the design and operating instructions.
(7) Before working on the pump and driver, switch the set off and ensure it cannot be accidentally switched on. Switch off and lock off the main switch.
(8) If it is likely that handling and storage has caused the grease to become contaminated, solidify, drain or form condensed water, make sure the pump is repacked before startup.
The pump must also be repacked every time the bearings are dismantled.
(9) Check the mechanical seal every day for overheating. A leaking seal should be removed, checked and replaced, if necessary.