33. In every tanker of Class VII(T) of 500 tons or over isolation valves shall be fitted in the fire main at poop front in a protected position and on the tank deck at intervals of not more than 40 metres to preserve the integrity of the fire main system in case of fire or explosion.
34. In every ship of Class VII(T) of 500 tons or over there shall be provided not less than four firemen’s outfits complying with the requirements of regulation 46. In addition one such outfit carried in any such ship shall include a breathing apparatus of the air-hose type and the remainder shall include breathing apparatus of the self-contained type: provided that where the air hose of an air-hose type breathing apparatus is required, in order to comply with paragraph 1 of Schedule 5 in Merchant Shipping Notice MSN 1665 to exceed 36 metres in length a self-contained breathing apparatus shall be provided either in addition to or as a substitute for that air-hose breathing apparatus.