For applications from 0 % to 100 % continuous rating, according to IACS and ISO 8528-5, the following dia-
gram is applied:
Fig. 1 Load application in steps as per IACS and ISO 8528-5.
According to the diagram in Fig. 1 the maximum allowable load application steps are defined in the table
below. (24.4 bar mean effective pressure has been determined as a mean value for the listed engine types.)
Note: Our small bore GenSets has normally a better load responce than required by IACS and therefore a
standard load responce test where three load steps (3 x 33%) is applied will be demostrated at factory accept-
ance test.
Minimum requirements concerning dynamic speed drop, remaining speed variation and recovery time during
load application are listed below.
In case of a load drop of 100 % nominal engine power, the dynamical speed variation must not exceed 10 %
of the nominal speed and the remaining speed variation must not surpass 5 % of the nominal speed.
MAN Diesel & Turbo
B 21 01 1
Shop test programme for power plants
1699986-3.2
Page 2 (4)
V28/32H, V28/32S, L28/32S, L27/38S, L23/30S, L21/31S, L16/24S
2016.03.17
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