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
exh
, standard 0 ... 30 mbar
Operating pressure Δp
exh
, range with increase of fuel consumption 30 ... 60 mbar
Operating pressure Δp
exh
, where a customized engine matching is needed > 60 mbar
Table 1: Exhaust gas back pressure after turbocharger
Intake air pressure turbocharger
Operating pressure Δp
intake
, standard 0 ... –20 mbar
Operating pressure Δp
intake
, range with increase of fuel consumption –20 ... –40 mbar
Operating pressure Δp
intake
, where a customized engine matching is needed < –40 mbar
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
exh
+ Abs(Δp
intake
), standard 0 ... 50 mbar
Operating pressure Δp
exh
+ Abs(Δp
intake
), range with increase of fuel consumption 50 ... 100 mbar
Operating pressure Δp
exh
+ Abs(Δp
intake
), where a customized engine matching is needed > 100 mbar
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
exh
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.
▪ At the same time the pressure drop Δp
intake
in
the intake air path must be kept below stated
standard operating pressure at all operating
conditions and including aging over lifetime.
MAN Diesel & Turbo
B 16 00 0
Exhaust gas system
1655213-2.6
Page 4 (4)
L28/32S, L27/38S, L23/30S, L21/31S, L16/24S, L23/30DF, L28/32DF, L16/24,
L21/31, L23/30H, L27/38, L28/32H
2015.01.14
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