46 C.F.R. § 154.1335 Pressure and vacuum protection.
Title 46 - Shipping
(a) Each cargo tank must have the following: (1) A pressure gauge that: (i) Monitors the vapor space; (ii) Is readable at the tank; and (iii) Has remote readouts at the cargo control station. (2) If vacuum protection is required under §154.804, a vacuum gauge meeting paragraphs (a)(1)(i), (a)(1)(ii), and (a)(1)(iii) of this section. (b) The vessel must have at least one high pressure alarm that: (1) Actuates before the pressure in any cargo tank exceeds the maximum pressure specially approved by the Commandant (G-MSO); and (2) Actuates an audible and visual alarm at the cargo control station, and a remote group alarm in the wheelhouse. (c) If vacuum protection is required under §154.804, the vessel must have at least one low pressure alarm that: (1) Actuates before the pressure in any cargo tank falls below the minimum pressure specially approved by the Commandant (G-MSO); and (2) Actuates an audible and visual alarm at the cargo control station, and a remote group alarm in the wheelhouse. (d) At least one pressure gauge must be fitted on each: (1) Enclosed hold; (2) Enclosed interbarrier space; (3) Cargo pump discharge line; (4) Liquid cargo manifold; and (5) Vapor cargo manifold. (e) There must be a local manifold pressure gauge between each manifold stop valve and each hose connection to the shore. [CGD 74–289, 44 FR 26009, May 3, 1979, as amended by CGD 82–063b, 48 FR 4782, Feb. 3, 1983]
Title 46: Shipping
PART 154—SAFETY STANDARDS FOR SELF-PROPELLED VESSELS CARRYING BULK LIQUEFIED GASES
Subpart C—Design, Construction and Equipment
Instrumentation
§ 154.1335 Pressure and vacuum protection.
