Section 181.310 - Fire main and hydrants(a) A vessel that has a power driven fire pump must have a sufficient number of fire hydrants to reach any part of the vessel using a single length of firehose.(b) Piping, valves, and fittings in a fire main system must comply with subpart G, part 182, of this chapter.(c) Each fire hydrant must have a valve installed to allow the firehose to be removed while the fire main is under pressure.(d) Spanner wrenches must be provided where a 40 millimeter (1.5 inch) diameter firehose is required by § 181.320(b) . Existing vessels as of July 22, 2016 have 180 days to comply with this requirement.CGD 85-080, 61 FR 982, Jan. 10, 1996, as amended at 62 FR 51358, Sept. 30, 1997; USCG-2012-0196, 81 FR 48299, July 22, 2016