153.530—Special requirements for alkylene oxides.
When Table 1 refers to this section, a containment system must meet the following:
(a)
Except as provided in paragraphs (b) and (c) of this section, a cargo containment system must be made of:
(b)
Except as provided in paragraph (c) of this section, gaskets must be composites of spirally wound stainless steel and Teflon or similar flourinated polymer.
(c)
The Commandant (CG-522) approves a cargo containment system using materials other than those described in this section for alkylene oxides on a case by case basis if:
(1)
The person wishing to have the containment system approved completes any tests prescribed by the Commandant (CG-522); and
(2)
The Commandant (CG-522) approves the results of the tests and the material for use with alkylene oxides.
(d)
The following materials are generally found unsatisfactory for gaskets, packing, insulation, and similar uses in alkylene oxide containment systems and would require extensive testing as described in paragraph (c) of this section before being approved:
(2)
Asbestos or asbestos mixed with other materials such as with many common insulations, packing materials, and gasket materials.
(3)
Be assembled from valves, fittings, and accessories having a pressure rating of not less than 1030 kPa gauge (approx. 150 psig) (American National Standards Institute); and
(h)
The cargo containment system vapor space and each space listed in paragraphs (k) and (l) of this section must have continuous monitoring of oxygen concentration or have an arrangement to enable sampling with a portable oxygen analyzer.
(i)
Valve disks or disk faces, seats, and other wearing valve parts must be made of stainless steel containing no less than 11 percent chromium.
(1)
An inert gas system meeting the requirements that apply to the inert gas system of a containment system in § 153.500, or
(2)
A forced ventilation system meeting the requirements that apply to a cargo handling space ventilation system in § 153.312.
(l)
Cofferdams, cargo tanks, double bottom spaces, void spaces and other enclosed spaces adjacent to an integral cargo tank must have an inert gas system meeting the requirements that apply to the inert gas system of a containment system in § 153.500.
(n)
The cargo discharge piping system must have a remotely actuated quick closing shutoff valve that meets § 153.284 at the cargo transfer hose connection.
(p)
All exposed parts of the cargo containment system above or on the deck, such as tank domes, cargo piping, and loading manifolds, must be covered by a water spray system that:
(2)
Has at least two remote manual actuators, one in each emergency shutdown station required by § 153.296; and
Code of Federal Regulations
[CGD 73-96, 42 FR 49027, Sept. 26, 1977, as amended by CGD 78-128, 47 FR 21210, May 17, 1982; CGD 82-063b, 48 FR 4782, Feb. 3, 1983; CGD 82-063b, 48 FR 39629, Sept. 1, 1983; CGD 81-078, 50 FR 21174, May 22, 1985]