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34. Arrangement of bilge pipes
(1) In every ship to which these regulations apply all pipes from the pumps for draining cargo spaces or any part of the machinery space shall be distinct from pipes which may be used for filling or emptying spaces in which water or oil is carried.
(2) All bilge pipes used in or under coal bunkers or fuel storage tanks or in boiler or machinery spaces, including spaces in which oil-settling tanks or oil fuel pumping units are situated, shall be of steel or other suitable material.
(3) Bilge suction pipes in such a ship shall not be led through oil tanks unless the pipes are enclosed in an oiltight trunkway. Such pipes shall not be led through double bottom tanks.
(4) Such pipes shall be made with flanged joints and shall be thoroughly secured in position and protected where necessary against the risk of damage. Efficient expansion joints or bends shall be provided in each line of pipe, and where a connection is made at a bulkhead or elsewhere with a lead bend the radius of each bend and the distance between the axes of the straight parts of the pipes shall be not less than 3 times the diameter of the pipe and the length of any bend shall be not less than 8 times that diameter.

35. Diameter of bilge suction pipes
(1) Subject to the provisions of subregulation (2) the internal diameter of main and branch bilge suction pipes shall be determined to the nearest standard size calculated according to the following formulae—

d m  = 25 + [1.68   L ( B + D ) ]    d b  = 25 + [2.15   I ( B + D ) ]  where   d m  = internal diameter of the main bilge suction pipes in millimetres.    d b  = internal diameter of the branch bilge suction pipes in millimetres.  L  = length of ship in metres.  B  = breadth of ship in metres.  D  = moulded depth of ship at bulkhead deck in metres.  I  = length of compartment in metres. 
(2) No main bilge suction pipe in any ship of Classes I to II(A) inclusive, shall be less than 63 millimetres in bore, and no branch suction pipe shall be less than 50 millimetres or need be more than 100 millimetres in bore.

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36. Precautions against flooding through bilge pipes
(1) In every ship to which Part II applies the bilge and ballast pumping systems shall be so arranged as to prevent water passing from the sea or from water ballast spaces into the ship’s cargo spaces or into any part of the machinery space or from one watertight compartment in the ship to another. The bilge connection to any pump which effects suction from the sea or from water ballast spaces shall be made by means of either a non-return valve or a cock which cannot be opened at the same time to the bilges and to the sea or to the bilges and the water ballast spaces. Valves in bilge distribution boxes shall be of a non-return type. An arrangement of lock-up valves or of blank flanges shall be provided to prevent any deep tank in such a ship being inadvertently run up from the sea when it contains cargo or pumped out through a bilge pipe when it contains water ballast, and instructions for the working of such arrangement shall be conspicuously displayed nearby.
(2) In every such ship provision shall be made to prevent the flooding of any watertight compartment served by a bilge suction pipe in the event of the pipe being severed or otherwise damaged in any other watertight compartment through collision or grounding. Where any part of such a pipe is situated nearer to the side of the ship than one-fifth of the mid-ship breadth of the ship measured at the level of the deepest subdivision load waterline or in any duct keel a non-return valve shall be fitted to the pipe in the watertight compartment containing the open end of the pipe.
(3) In every ship to which these regulations apply, the bilge main shall not be situated nearer to the ship’s side than one-fifth of the breadth of the ship measured at right angles to the centre line of the ship at the level of the deepest subdivision load waterline, and where any bilge pump or its pipe connecting it to the bilge main is not so situated the arrangements shall be such that damage to the ship’s side penetrating to the extent of one-fifth of the ship’s breadth measured as described in this subregulation shall not put the other bilge pumping arrangements out of action.

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37. Bilge valves, cocks, etc.
(1) In every ship to which Part II applies all distribution boxes, valves and cocks fitted in connection with the bilge pumping arrangements shall be in positions which are accessible at all times in ordinary circumstances and shall be so arranged that in the event of flooding one of the bilge pumps may operate on any watertight compartment in the ship. If in any such ship there is only one system of pipes common to all such pumps, the necessary valves or cocks for controlling the bilge suctions shall be capable of being operated from above the ship’s bulkhead deck. If an emergency bilge pumping system is provided in addition to the main bilge pumping system it shall be independent of the main system and shall be so arranged that a pump is capable of being operated on any watertight compartment under flooding conditions; in that case the cocks and valves necessary for the operation of the emergency system shall be capable of being operated from above the bulkhead deck:
Provided that in any ship of Class II(A) of under 30.5 metres in length provided with a hand pump of the lever type for each watertight compartment in accordance with the provisions of regulation 31(1), the valves and cocks on the bilge main for controlling the bilge suctions shall not be required to be capable of being operated from above the ship’s bulkhead deck if they are in the same compartment as a power pump.
(2) In every such ship every operating rod for bilge suction valves or cocks shall be led as directly as possible. Every such rod passing through a cargo or coal bunker space shall be protected against damage in such spaces.
(3) In every such ship every valve or cock which is required by this regulation to be operated from above the bulkhead deck shall have its control at its place of operation clearly marked to show the purpose it serves and how it may be opened and closed and shall be provided with a means to indicate when it is open and when it is closed.

38. Bilge mud boxes and strum boxes
Bilge suctions in the machinery space of every ship to which these regulations apply shall be led from readily accessible mud boxes placed wherever practicable above the level of the working floor of such space. The boxes shall have straight tailpipes to the bilges and covers secured in such a manner as will permit them to be readily opened and closed. The suction ends in hold spaces and tunnel wells shall be enclosed in strum boxes having perforations approximately 10 millimetres in diameter, and the combined area of such perforations shall be not less than twice that of the end of the suction pipe. Strum boxes shall be so constructed that they can be cleared without breaking any joint of the suction pipe.