Main Feed Pumps Parts

(Page 3) End item NSN parts page 3 of 51
Part Number
NSN
NIIN
002-003990-021 Hexagon Plain Nut
009971888
002000-03 Annular Ball Bearing
001448589
00213-0073 Needle Roller Bearing
002273245
00213-0571 Annular Ball Bearing
005543913
00213-0573 Annular Ball Bearing
002939302
002222 O-ring
005956327
003-007868-094 Socket Head Cap Screw
000518606
003-07941-045 Setscrew
008213597
003-07941-068 Setscrew
006825971
003-07941-070 Setscrew
006825972
0030107 Round Plain Nut
001856461
0030107-7 Round Plain Nut
001856461
0032222 Round Plain Nut
001856389
003222EE O-ring
010062129
003226ED O-ring
001661112
00384710 Tube Coupling Inverted Nut
002889390
004-99974 Annular Ball Bearing
002939302
0042832 Annular Ball Bearing
002939163
0042980 Annular Ball Bearing
002939302
0042980-3 Annular Ball Bearing
002939302
Page: 3 ...

Main Feed Pumps

Picture of Main Feed Pumps

A deaerating feed tank (DFT), often found in steam plants that propel ships, is located after the main condensate pump and before the main feed booster pump. It has these three purposes:

Based on the relevant theoretical Rankine cycle diagram, there are four main processes, or steps:

In the practical implementation of a Rankine cycle, it is common to break the single pump (process 1 to 2) into three pumps: (in water flow order: condensate pump, feed booster pump and then feedwater pump).

A surge volume allows the plant to change bells (power output level) without running the feed pump dry or flooding the turbines. Consider the plant running in a steady state condition.

The bell is increased, more power output demanded, the rate of feed is increased. This draws more water from the condenser, perhaps to the point of being dry and starving the boiler resulting in a loss of propulsion. This is until the water, converted to steam, provides its energy to the turbine and then is condensed in the condenser.

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