Section 154.1335 - Pressure and vacuum protection(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 (CG-OES); 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 (CG-522); 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:(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