Section
5 Sizes of bilge suction pipes
5.1 Main bilge line
5.1.1 The
diameter, d
m, of the main bilge line is to
be not less than required by the following formula, to the nearest
5 mm, but in no case is the diameter to be less than that required
for any branch bilge suction:
where
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d
m
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= |
internal diameter of main bilge line, in mm |
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B
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= |
greatest
moulded breadth of ship or maximum breadth of cargo hold for ore carriers,
in metres |
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D
|
= |
moulded
depth to bulkhead deck, in metres |
|
Lm
|
= |
Rule
length of ship as defined in Pt 3, Ch 1, 6.1 Principal particulars, in metres, for ships other than passenger ships
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| = |
Load line length of ship as defined in Pt 3, Ch 1, 6.1 Principal particulars in metres, for passenger ships. |
5.2 Branch bilge suctions to cargo and machinery spaces
5.2.1 The
diameter, d
b, of branch bilge suction pipes
to cargo and machinery spaces is to be not less than required by the
following formula, to the nearest 5 mm, but in no case is the diameter
of any suction to be less than 50 mm:
5.3 Direct bilge suctions, other than emergency suctions
5.3.1 The
direct bilge suctions in the main engine room, and the direct bilge
suctions in large separate boiler rooms, motor rooms of electrically
propelled ships and auxiliary engine rooms are not to be of a diameter
less than that required for the main bilge line.
5.3.2 Where
the separate machinery spaces are of small dimensions, the sizes of
the direct bilge suctions to these spaces will be specially considered.
5.4 Main bilge line − Tankers and similar ships
5.4.1 In
oil tankers and similar ships, where the engine room pumps do not
deal with bilge drainage outside the machinery space, the diameter
of the main bilge line may be less than that required by the formula
in Pt 5, Ch 13, 5.1 Main bilge line 5.1.1, provided that the
cross-sectional area is not less than twice that required for the
branch bilge suctions in the machinery space.
5.5 Distribution chest branch pipes
5.5.1 The
area of each branch pipe connecting the bilge main to a distribution
chest is to be not less than the sum of the areas required by the
Rules for the two largest branch bilge suction pipes connected to
that chest, but need not be greater than that required for the main
bilge line.
5.6 Tunnel suction
5.6.1 The
bilge suction pipe to the tunnel well is to be not less than 65 mm
bore, except in ships not exceeding 60 m in length, in which case
it may be 50 mm bore.
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