Help with translating a sentence

Thread Content

The last edit to this post was made by 11-qqaazz on 2012-8-24 at 10:31. As the title suggests: How should the following sentence be translated? “250°F (120°C) or to within 35°F (19°C) of the glass transition temperature (whichever is lower) for design temperatures in excess of 150°F (65°C).” Here is the context: The maximum design, operating, and test temperatures for Class I vessels are set as follows: (a) 150°F (65°C) for design temperatures less than or equal to 150°F (65°C); (b) 250°F (120°C) or to within 35°F (19°C) of the glass transition temperature (whichever is lower) for design temperatures exceeding 150°F (65°C). The maximum design, operating, and test temperatures for Class II vessels are limited to an inside wall temperature of 250°F (120°C) or to within 35°F (19°C) of the glass transition temperature of the resin (whichever is lower). The minimum design temperature for both Class I and Class II vessels must be −65°F (−54°C). The last edit to this post was made by 11-qqaazz on 2009-3-26 at 22:12.]