A—l 6

(d) The freeboard corresponding to each approved subdivision loadline and the conditions of service for which it is approved, shall be clearly indicated on the Safety Certificate. (e) In no case shall any subdivision loadline mark be placed above the deepest loadline in salt water as determined by the strength of the ship and/or the International Convention respecting Load Lines, 1930. (/) Whatever may be the position of the subdivision loadline marks, a ship shall in no case be loaded so as to submerge the load line mark appropriate to the season and locality as determined in accordance with the International Convention respecting Load Lines, 1930. (g) A ship shall in no case be so loaded that when she is in salt water the subdivision loadline mark appropriate to the particular voyage and condition of service is submerged. Regulation 11 Construction and Initial Testing of Watertight Bulkheads, &c. (a) Watertight subdivision bulkheads, whether transverse or longitudinal, shall be constructed in such a manner that they shall be capable of supporting, with a proper margin of resistance, the pressure due to a head of water up to the margin line in way of each bulkhead. The construction of these bulkheads shall be to the satisfaction of the Administration. (b) (i) Steps and recesses in bulkheads shall be watertight and as strong as the bulkhead at the place where each occurs. (ii) Where frames or beams pass through a watertight deck or bulkhead, such deck or bulkhead shall be made structurally watertight without the use of wood or cement. (c) Testing main compartments by filling them with water is not compulsory. A complete examination of the bulkheads shall be made by a surveyor, and, in addition, a hose test shall be made in all cases. (d) The forepeak, double bottoms (including duct keels) and inner skins shall be tested with water to a head up to the margin line. (e) Tanks which are intended to hold liquids, and which form part of the subdivision of the ship, shall be tested for tightness with water to a head up to the deepest subdivision loadline or to a head corresponding to two-thirds of the depth from the top of keel to the margin line in way of the tanks, whichever is the greater ; provided that in no case shall the test head be less than 3 feet (or 0-92 metres) above the top of the tank. (/) The tests referred to in paragraphs (d) and (e) are for the purpose of ensuring that the subdivision structural arrangements are watertight and are not to be regarded as a test of the fitness of any compartment for the storage of oil fuel or for other special purposes for which a test of a superior character may be required depending on the height to which the liquid has access in the tank or its connections. Regulation 12 Openings in Watertight Bulkheads (a) The number of openings in watertight bulkheads shall be reduced to the minimum compatible with the design and proper working of the ship ; satisfactory means shall be provided for closing these openings*

36