11 Within cargo tanks.
12 Not permitted in steering gear hydraulic systems, otherwise Class III systems only.
13 On vent risers on decks only.
14 Accessible location inboard of required shell valve(s) may be permitted. Slip-on joints are not permitted where there are no shell valve(s), for example, when outboard end >450 mm below free board deck or outboard end < 600 mm above summer waterline. For such instances, the overboard piping is required to be of substantial thickness per definition in 4-6-2/9.13.3.
15 Permitted in Class III piping in machinery spaces of Category A, other machinery spaces, accommodation spaces and open deck. Additionally, on open decks restrained slip type joints only are permitted for pressures up to 10 bar (10.2 kgf/cm2, 145 psi).
16 On the open deck only.