MAN B&W 4.05
Page 9 of 9
MAN Diesel
198 82 88-9.1
MAN B&W 98-60 MC/MC-C/ME/ME-C/ME-B/-GI engines
Waste Heat Recovery Element and Safety Valve
The boiler water or steam for power generator is
preheated in the Waste Heat Recovery (WHR) ele-
ment, also called the first-stage air cooler.
The WHR element is typically built as a high-pres-
sure water/steam heat exchanger which is placed
on top of the scavenge air cooler, see Fig. 4.05.08.
Full water flow must be passed through the WHR
element continuously when the engine is running.
This must be considered in the layout of the
steam feed water system (the WHR element sup-
ply heating). Refer to our ‘WHR element specifica-
tion’ which is available from MAN Diesel & Turbo,
Copenhagen.
Fig. 4.05.08: WHR element on Scavenge air cooler
Scavenge air cooler
Cooling water pipes
Air cooler
Cooling water pipes
WHR air cooler
Scavenge air cooler
WHR air cooler
TI 8442
TE 8442
TI 8441
PT 8444 I AH AL
TE 8441 AH
PT 8440 I AH AL
PDT 8443 I
521 39 06-2.1.1
Fig. 4.05.09: WHR safety valve blow-off through con-
nection ‘W’ to the funnel
BP
W
Main
Engine
BN
Top of funnel
The letters refer to list
of ‘Counterflanges’
078 63 84-0.0.1
Safety valve and blow-off
In normal operation, the temperature and pressure
of the WHR element is in the range of 140-150 ˚C
and 8-21 bar respectively.
In order to prevent leaking components from
causing personal injuries or damage to vital parts
of the main engine, a safety relief valve will blow
off excess pressure. The safety relief valve is con-
nected to an external connection, ‘W’, see Fig.
4.05.09.
Connection ‘W’ must be passed to the funnel or
another free space according to the class rules for
steam discharge from safety valve.
As the system is pressurised according to class
rules, the safety valve must be type approved.
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