I understand that if metal undergoes a cold temperature excursion, its mechanical properties (e.g. ductility, yield strength, tensile strength) should return to "normal" once the material warms back to ambient temperature. Would carbon steel (say, A106) material return to "normal" properties if...
Without using process simulation software, I'd like to estimate:
(1) the temperature decrease of a nitrogen vapor stream going from +70 Deg. F and 5,000 psig through a PSV to 0 psig.
(2) the temperature decrease of a nitrogen liquid stream going from +20 Deg. F and 5,000 psig through a PSV...
At least some boiler systems I have evaluated do NOT have a high TUBE temperature (not high steam temp)shutdown.
I would appreciate comments as to why a boiler would not have high TUBE temperature shutdown instrumentation to protect the tubes from overheating and failure.
Thanks...
