API 650, Appendix V, provides the normal operating external pressure range as 0.25 kPa (0.036 lbf/in2) to 6.9 kPa (1.0 lbf/in2). I understand API 620 tanks stipulates the maximum partial vacuum to be at least 1 in. wc. Is there an upper limit too on the design vacuum pressure for API 620 tanks?
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Design vacuum pressure for API 620 tanks
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