MARPOL Consolidated Edition 2017

Annex II: Regulations for the control of pollution by noxious liquid substances in bulk
3.2.4 Collect all water remaining in the cargo tank and its associated piping into a calibrated container for
measurement. Water residues shall be collected, inter alia, from the following points:
.1 the cargo tan k suction and its vicinity;
.2 any entrapped areas on the cargo tank bottom;
.3 the low point drain of the cargo pump; and
.4 all low point drains of piping associated with the cargo tank up to the manifold valve.
3.2.5 The total water volumes collected above determine the stripping quantity for the cargo tank.
3.2.6 Where a group of tanks is served by a common pump or piping, the water test residues associated with
the common system(s) may be apportioned equally among the tanks provided that the following operational
restriction is included in the ship's approved Manual: " For sequential unloading of tan ks in this group, the
pump or piping is not to be washed until all tanks in the group have been unloaded."
Test hose or pipe
/_ ___ _
2 10m
Cargo piping
,/ Flange
Ship's deck
Ship's side
Figure 5 -1
Cargo piping
Manifold
valve
)
Constant pressure valve
set at 100 kPa
Pressure gauge
Ship's deck
Ship's side
Figure 5-2
The above figures illustrate test arrangements that would provide a backpressure of not less than 100 kPa at
the cargo tank's unloading manifold.
214 MARPOL CONSOLIDATED EDITION 2017