Question about Hydrotest Principle for Tanks
Question about Hydrotest Principle for Tanks
(OP)
I am thinking about the hydrotest process for tanks.
Currently I am working on a tank to room a liquid which S.G. is 1.9. Per API 650, the hydrotest is required.
I have some experience for piping, normally a higher test pressure is used(i.e. 1.25 * Max Operating Pressure).
But for tanks, it seems a lower pressure is used per the smaller S.G. of the water and you also can not add presure for the water in tanks as in pipes.
I know the hydrotest is mostly for checking the leakage not the stress capability. But I am still wondering why it is acceptable even the working liquid is heavier or the working pressure is larger.
Thanks.
Currently I am working on a tank to room a liquid which S.G. is 1.9. Per API 650, the hydrotest is required.
I have some experience for piping, normally a higher test pressure is used(i.e. 1.25 * Max Operating Pressure).
But for tanks, it seems a lower pressure is used per the smaller S.G. of the water and you also can not add presure for the water in tanks as in pipes.
I know the hydrotest is mostly for checking the leakage not the stress capability. But I am still wondering why it is acceptable even the working liquid is heavier or the working pressure is larger.
Thanks.
3 years industry experience;
Oil & Gas industry in Canada.





RE: Question about Hydrotest Principle for Tanks
RE: Question about Hydrotest Principle for Tanks
petroleum, petroleum products, and other liquid products."
It seems there is no restriction for liquid lighter than water...
3 years industry experience;
Oil & Gas industry in Canada.
RE: Question about Hydrotest Principle for Tanks
3 years industry experience;
Oil & Gas industry in Canada.
RE: Question about Hydrotest Principle for Tanks
API answered a technical inquiry about this:
650-I-21/00
Question 1: Does API 650 require any additional testing beyond the hydrostatic (water) test specified in Section 5.3.5 for a tank designed for product with specific gravity greater than 1?
Reply 1: No. Section F.7.6 provides additional requirements for Appendix F tanks. The Purchaser may require more stringent testing as a supplemental requirement.
RE: Question about Hydrotest Principle for Tanks