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How to know the tank is designed to stand with external pressure

How to know the tank is designed to stand with external pressure

(OP)
Hi everyone
How to know the oil tank is designed to protect external pressure ?

Tank data
Design Code : API 650
Design Press : ATM
Design temp : 150 oc
Operate Press. : ATM
Operate temp : 100 oc
vent : yes

Thank you

RE: How to know the tank is designed to stand with external pressure

Design Code : API 650
Design Press : ATM

RE: How to know the tank is designed to stand with external pressure

See Section 5.2.1(b), last sentence, in the current API-650.
If designed for additional external pressure, it should show up on the nameplate or in the design calculations or on the drawings.
If not designed for any additional external pressure, it could be evaluated per Appendix V. Generally, small tanks will have higher external pressure ratings than large tanks.

RE: How to know the tank is designed to stand with external pressure

Per section 5.2.1.b, tanks designed to the basic standard are suitable for external pressure up to 1 inch of water without any additional calculations. Your tank should be good up to that external pressure (internal vacuum).

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