A、A.primarily to lubricate the shaft seals
B、B.due to the inability of this type of pump to lift water to cover the suction (eye) of the impeller
C、C.to initially unload the pump by having its head pressure equal to discharge pressure
D、D.in order to overcome the potential energy of water in the discharge line
更多“A centrifugal bilge pump requires priming （）.”相关的问题
A、centrifugal pump is cheaper than reciprocating pump B、the size of centrifugal pump with same capacity is smaller than that of reciprocating pump C、centrifugal pump makes maintenance easier than reciprocating pump does D、all of the above
A、motor overload would open B、relief valve would open C、pump would eventually overheat D、motor would overheat
A、A.motor overload will open B、B.relief valve will open C、C.pump will overheat D、D.motor will overheat
A、stop-check valves installed in the bilge manifolds B、using a positive displacement reciprocating bilge pump C、installing eductors in all bilge rose boxes D、installing a swing check before each bilge valve
A、A.bilge well connected to that valve, plus the second bilge well being pumped will be completely emptied B、B.bilge system will lose vacuum and prevent the other bilges from being pumped out C、C.bilge well aft connected to that valve will siphon its contents to the forward bilge wells D、D.discharge pressure will be too high
A、pump must always be primed B、volute must impart a radial and rotary motion of the water suction side C、connection must guide the liquid to the lantern rings D、stuffing box should not be allowed any water leakage
A、Bitumen is used in bilges and peak tanks. B、Paint is used in bilges and peak tanks. C、Bitumen is used in bilges and double bottom tanks D、. Varnish is used in bilges and peak tanks.
A、add strength to the bilge well strainer B、permit rapid flow of water to the bilge wells C、prevent cargo sifting into the bilge wells D、preven oil, water , or other liquid from reaching the cargo
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