46 CFR §154.532

1. (a)Except connections for tank safety relief valves and except for liquid level gauging devices other than those under §§ 154.536 and 154.1310, liquid and vapor connections on a cargo tank with a MARVS greater than 69 kPa gauge (10 psig) must have, as close to the tank as practical, a:
   1. (1)Stop valve capable of local manual operation; and
   2. (2)A remotely controlled quick-closing shut-off valve.
2. (b)If the nominal pipe size of a liquid or vapor connection is less than 50 mm (2 in.), an excess flow valve may be substituted for the quick-closing valve under paragraph (a) of this section.
3. (c)One valve may be substituted for the manual controlled stop valve and the remotely controlled quick-closing shut-off valve required under paragraph (a) of this section if that valve:
   1. (1)Meets §§ 154.540 and 154.544; and
   2. (2)Is capable of local manual operation.