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B 16 00 0
L28/32S, L27/38S, L23/30S, L21/31S, L16/24S, L23/30DF, L28/32DF, L16/24,
L21/31, L23/30H, L27/38, L28/32H
Resulting installation demands
If the recommended exhaust gas back pressure
cannot be kept due to exhaust gas after treatment
installations. Following items need to be consid-
ered.
Exhaust gas back pressure after turbocharger
Operating pressure Δp
Operating pressure Δp
Operating pressure Δp
Table 1: Exhaust gas back pressure after turbocharger
Intake air pressure turbocharger
Operating pressure Δp
Operating pressure Δp
Operating pressure Δp
Table 2: Intake air pressure turbocharger
Sum of the exhaust gas back pressure after turbocharger and the absolute value of the intake air pressure before
turbocharger
Operating pressure Δp
Operating pressure Δp
Operating pressure Δp
Table 3: Sum of the exhaust gas back pressure after turbocharger and the absolute value of the intake air pressure before turbocharger
Maximum exhaust gas pressure drop – Layout
▪ Shipyard and supplier of equipment in exhaust
gas line have to ensure that pressure drop Δp
over entire exhaust gas piping incl. pipe work,
scrubber, boiler, silencer, etc. must stay below
stated standard operating pressure at all oper-
ating conditions.
▪ It is recommended to consider an additional
10 mbar for consideration of aging and possible
fouling/staining of the components over lifetime.
▪ Possible counter measures could be a proper
dimensioning of the entire flow path including all
installed components or even the installation of
an exhaust gas blower if necessary.
Exhaust gas system
, standard
exh
, range with increase of fuel consumption
exh
, where a customized engine matching is needed
exh
, standard
intake
, range with increase of fuel consumption
intake
, where a customized engine matching is needed
intake
+ Abs(Δp
), standard
exh
intake
+ Abs(Δp
), range with increase of fuel consumption
exh
intake
+ Abs(Δp
), where a customized engine matching is needed
exh
intake
▪ At the same time the pressure drop Δp
the intake air path must be kept below stated
standard operating pressure at all operating
conditions and including aging over lifetime.
exh
MAN Diesel & Turbo
1655213-2.6
Page 4 (4)
0 ... 30 mbar
30 ... 60 mbar
> 60 mbar
0 ... –20 mbar
–20 ... –40 mbar
< –40 mbar
0 ... 50 mbar
50 ... 100 mbar
> 100 mbar
in
intake
2015.01.14
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