Page 117 - Introduction to Marine Engineering

104 Feed systems

Dump steam inlert Scum valve conn. Thermometer Air valve Vac. gauge conn
bolt conn,
Steam inlet hood

Spare boss plugged

Outlet branch
Return water box

Span steam Met

Condenser shell

Circulating water
inlet branch Inlet end water box Suction air facing Condensate tump Water levti glass

Manhole & inspection door Stay rod Diaphragm plate Tubeplata

Division rib

Drain plug

^ Boiling out valve conn. / Drain valve conn.
Return condeniate Condensate outlet Thermometer bolt conn.
Figure 5.5 Auxiliary condenser

Extraction pumps are usually of the vertical shaft, two stage,
centrifugal type, as described in Chapter 6. These pumps require a
specified minimum suction head to operate and, usually, some
condensate level control system in the condenser. The first-stage
impeller receives water which is almost boiling at the high vacuum
conditions present in the suction pipe. The water is then discharged at a