Source: https://ecfr.io/Title-49/se49.3.178_1338_61
Timestamp: 2019-11-20 01:03:29
Document Index: 113652834

Matched Legal Cases: ['§178', 'art 178', '§178', 'art 178', '§178', 'art 178', '§178', '§178', '§171', '§173', '§178', '§173', '§178']

[49 CFR §178.338-1] Title 49 Part 178 → Subpart J → §178.338-1 : Code of Federal Regulations ';
Title 49 Part 178 → Subpart J → §178.338-1
Title 49 → Subtitle B → Chapter I → Subchapter C → Part 178 → Subpart J → §178.338-1
§178.338-1 General requirements.
(1) Design pressure means the “MAWP” as used in Section VIII of the ASME Code (IBR, see §171.7 of this subchapter), and is the gauge pressure at the top of the tank.
(2) Design service temperature means the coldest temperature for which the tank is suitable (see §§173.318 (a)(1) and (f) of this subchapter).
(c) Each tank must be designed, constructed, certified, and stamped in accordance with Section VIII of the ASME Code.
(d) The exterior surface of the tank must be insulated with a material compatible with the lading.
(1) Each cargo tank must have an insulation system that will prevent the tank pressure from exceeding the pressure relief valve set pressure within the specified holding time when the tank is loaded with the specific cryogenic liquid at the design conditions of—
(i) The specified temperature and pressure of the cryogenic liquid, and
(2) For a cargo tank used to transport oxygen, the insulation may not sustain combustion in a 99.5 percent oxygen atmosphere at atmospheric pressure when contacted with a continuously heated glowing platinum wire. The cargo tank must be marked in accordance with §178.338-18(b)(7).
(e) The insulation must be completely covered by a metal jacket. The jacket or the insulation must be so constructed and sealed as to prevent moisture from coming into contact with the insulation (see §173.318(a)(3) of this subchapter). Minimum metal thicknesses are as follows:
Stainless steel 18 0.0428 22 0.0269
Low carbon mild steel 12 0.0946 14 0.0677
Aluminum 0.125 0.1000
(2) If the jacket also supports additional loads, such as the weight of the tank and lading, the combined stress, computed according to the formula in §178.338-3(b), may not exceed 25 percent of the minimum specified tensile strength.