![]() Pipe stress and expansion contraction loops of cold pipe works out better than hot pipe. Latexman, am I mistaken in that thought? Insulation will be needed. ![]() Liquid ammonia will be below the freezing point of water, so you need to dry it out as much as possible in any case, otherwise it will all freeze out at the last point where the ammonia crossed 0C. Not sure about the alternative fuel and other stuff he says there, just needed to show the map of the ammonia pipeline delivery system (making a lot of money) in the USA. With that said and the owner's written permission, I can say that B31,4 has been allowed many times in the past. The good thing is that B31.4 also does not say it can't be used for lower temperatures, it just says it specifically doesn't cover lower temperatures, which in that case the engineer must make sure that he does. Liquid ammonia boils (at -33.3☌) a few degrees below the declared B31.4 low limit temperature. You must take into consideration that the lowest temperature provision of B31.4 will be exceeded. I certainly have used B31.4 to design a liquid ammonia pipeline. Use low temperature ASTM A333 pipe by the way. ![]() I don't see any of that as a problem, because I've done it before, providing you do your pipe testing at lower than the lowest temperature ammonia you will have in the pipeline.
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