46 CFR § 54.05-6
Toughness test temperatures
April 15, 2021
Each toughness test must be conducted at temperatures not warmer than −20 °F or 10 °F below the minimum service temperature, whichever is lower, except that for service at or below −320 °F, the tests may be conducted at the service temperature in accordance with §54.25-10(a)(2).
[CGD 85-061, 54 FR 50964, Dec. 11, 1989]
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