CFR > Title 46 - Shipping > CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY > SUBCHAPTER O—CERTAIN BULK DANGEROUS CARGOES (parts 150 to 155) > PART 154—SAFETY STANDARDS FOR SELF-PROPELLED VESSELS CARRYING BULK LIQUEFIED GASES > SUBPART C—Design, Construction and Equipment (§154.170 to §154.1440) > 154.1335—Pressure and vacuum protection.

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-522); 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:
(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]