MARPOL Consolidated Edition 2017

Annex I: Regulations for the prevention of pollution by oil
Figure B - Measurement of h for calculation of PAc for double bottom tanks with sloping tank tops (2)
Section view
I
--. 2.om
1
h x double bottom tank length x 2·
Figure 9 - Calculation of PAs for double bottom tank without clearly
defined turn of bilge area - when wing tank is cargo tank
Centreline
I
Cargo tank
- - ----b- -----
Double bottom
D
5
l
If h is less than 2 m or fs, whichever is less, anywhere along the tank length, but h db is at least 2 m or fs. whichever is
less, along the entire tank length within the width of 2b, then:
PAs = 2b x cargo tank length
To include port and starboard.
160 MARPOL CONSOLIDATED EDITION 2017