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220.127.116.11 Aboveground Tanks
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The vacuum jacket used as an outer vessel for storage tanks in cryogenic fluid service shall be of welded steel construction designed to withstand the maximum internal and external pressure to which it will be subjected under operating conditions to include conditions of emergency pressure relief of the annular space between the inner vessel and the outer vessel. [55:18.104.22.168.1]
The jacket shall be designed to withstand a minimum collapsing pressure differential of 30 psi (207 kPa). [55:22.214.171.124.2]
A connection shall be provided on the exterior of the vacuum jacket to allow measurement of the pressure within the annular space between the inner vessel and the outer vessel. [55:126.96.36.199.3.1]
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