CEA 4001 - Page 50

50
T
Table 12: Minimum capacity of reduced capacity tanks
Hazard Class
Minimum capacity
m
3
LH - Wet or pre-action
OH1
- Wet or pre-action
OH1
- Dry or alternate
OH2
- Wet or pre-action
OH2
- Dry or alternate
OH3
- Wet or pre-action
OH3
- Dry or alternate
OH4
- Wet or pre-action
HHP
and HHS
5
10
20
30
50
70,
but in no case less
than
10% of the full capacity
8.3.5 Effective capacity of thanks and dimensions of suction chambers
The effective capacity of storage tanks shall be calculated as shown in Figure 4, where:
- N is the normal water line;
- X is the low water level;
- D is the diameter of the suction pipe.
Table 13 specifies minimum dimensions for the following:
- ‘A’ from the suction pipe to the low water level, (see Figure 4) ;
- ‘B’ from the suction pipe to the bottom of the sump, (see Figure 4).
If a vortex inhibitor is installed with the minimum dimensions specified in Table 13, dimension ‘A’ may be
reduced
to 0,10m.