MAN B&W 6.04
Page of 12
MAN Diesel
MAN B&W S90MC-C8, K90MC-C6, S80MC-
C8, K80MC-C6, S70MC-C8, S60MC-C8,
L60MC-C7/8, S50MC-C8
198 61 77-6.0
∆m
M%
: change of specic exhaust gas amount, in
% of specic gas amount at nominal MCR
(L
1
), see Fig. 6.04.07.
∆T
M
: change in exhaust gas temperature after
turbocharger relative to the L1 value, in °C,
see Fig. 6.04.08. (P
O
= P
M
)
∆T
O
: extra change in exhaust gas temperature
when optimising point O lower than 100% M:
P
O%
= (P
O
/P
M
) x 100%.
∆T
O
= 0.3 x (100 P
O%
) [6]
b) Correction for actual ambient conditions and
backpressure
For ambient conditions other than ISO
3046-1:2002 (E) and ISO 15550:2002 (E), and
backpressure other than 300 mm WC at
specied MCR point (M), the correction fac-
tors stated in the table in Fig. 6.04.0 may
be used as a guide, and the corresponding
relative change in the exhaust gas data may
be found from equations [7] and [8], shown in
Fig. 6.04.10.
Parameter Change
Change of
exhaust gas
temperature
Change of
exhaust gas
amount
Blower inlet temperature + 10° C + 16.0° C 4.1 %
Blower inlet pressure (barometric pressure) + 10 mbar 0.1° C + 0.3 %
Charge air coolant temperature (seawater temperature) + 10° C + 1.0° C + 1. %
Exhaust gas back pressure at the specied MCR point + 100 mm WC + 5.0° C 1.1 %
Fig. 6.04.09: Correction of exhaust gas data for ambient conditions and exhaust gas back pressure
∆m
M%
= 14 x ln (P
M
/P
L1
) – 24 x ln (n
M
/n
L1
)
Fig. 6.04.07: Change of specic exhaust gas amount,
∆m
M%
in % of L
1
value and independent of P
O
∆T
M
= 15 x ln (P
M
/P
L1
) + 45 x ln (n
M
/n
L1
)
Fig. 6.04.08: Change of exhaust gas temperature, ∆T
M
in point M, in °C after turbocharger relative to L
1
value
and valid for P
O
= P
M
178 51 117.2
178 51 130.2
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