Hydrostatic testing of tank with high s.g liquid
Hydrostatic testing of tank with high s.g liquid
(OP)
How do you test a tank that holds liquid with s.g. >1.0, such as molten sulfur.
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Hydrostatic testing of tank with high s.g liquid
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RE: Hydrostatic testing of tank with high s.g liquid
RE: Hydrostatic testing of tank with high s.g liquid
I saw a reference in an old drawing where they filled the tank with water and then applied a slight internal pneumatic pressure, although so far I have found no reference to such a procedure in the literature. This method would also apply a lift to the underside of the tank roof which may not be advisable.
Wondering if there is any other test procedure stated anywhere else.
RE: Hydrostatic testing of tank with high s.g liquid
and no impact of leftover testing fluid onto tank's integrity etc.if faults witnessed/repairs encountered?
Best Regards
Qalander(Chem)
RE: Hydrostatic testing of tank with high s.g liquid
Consider testing by using Barite, sg 4.5, as a dry powder or as a mixed additive to H2O, to meet or exceed the 1.82 sg of molten Sulfur potential fluid pressure on the tank.
A knowledgeable Chemist could possibly recommend other H2O increasing additives.
At 74th year working on IR-One2 PhD from UHK - - -
RE: Hydrostatic testing of tank with high s.g liquid
Cheers,
John
RE: Hydrostatic testing of tank with high s.g liquid
RE: Hydrostatic testing of tank with high s.g liquid
API offers no other guidance, and in fact has recently answered the question "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?" with this answer: "No. Section F.7.6 provides addtional requirements for Appendix F tanks. The purchaser may require more stringent testing as a supplemental requirement."
RE: Hydrostatic testing of tank with high s.g liquid
Also, the book "The Aboveground Steel Storage Tank Handbook" by Digrado and Thorp says that API620, sec 5.2.3, provides two methods for tank hydrotesting combined with an air pressure up to 1.25 times design pressure. This should be similar to what IFRs describes above. However, this method requires a lot more safeguards I am sure.
I plan to check out API 620 and 650 codes soon.
Thanks for all the info everyone.
RE: Hydrostatic testing of tank with high s.g liquid
Joe Tank
RE: Hydrostatic testing of tank with high s.g liquid
I don't exactly know the impact but,if we go on increasing gravity and therby reduce vertical column.
Are we not leaving the top portions unchecked if no radiography welds health confirmation exixts?
Best Regards
Qalander(Chem)
RE: Hydrostatic testing of tank with high s.g liquid
Normally such tanks will be built and hydrotested like any other tank. If additional safety is desired, it would make more sense to specify a lower design stress, a decreased joint effiiciency for design, or increased radiography, rather than going to great lengths to overstress the shell.
The API-650 hydrotest is not intended as an overstress proof-test as is done with pressure vessels. API limits the amount of overstress by specifying the allowable hydrotest stresses, but does not require that these stresses be reached in order to properly hydrotest a tank.
RE: Hydrostatic testing of tank with high s.g liquid