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Re: [MW:23147] Hydrostatic temp.

By Materials & Welding
If your question is related to ASME Sec VIII-Div I, then UG-99-(h) recommends as below

"The metal temperature during hydrostatic test be maintained at least 30°F (17°C) above the minimum design metal temperature, but need not exceed 120°F (48°C), to minimize the risk of brittle fracture."
Also the test liquid shall be at a temperature higher than the nil-ductility transition temperature of the material being tested.- Reference ASTM E1003.

The nil ductility temperature is the highest temperature at which a material experiences complete brittle fracture without appreciable plastic deformation.


Regds/Jignesh


On Sunday, 5 July 2015 11:09:24 UTC+5:30, Prakash Gotimukul wrote:
Dear All,
Any topic that you raise, please give details of equipment/product and relevant code/standards that you are refering. This will make the topic easy to understand and elicit replies.After all we are interested in standard requirement, unless it is a open, general question.?

Rgds
G.Prakash
AIS, AIA LLC TX, USA
Tel: +9714 2778511 Mob:+97152 979 5678

On Sat, Jul 4, 2015 at 3:59 PM, sajid ahmad <sajid.qaqc@gmail.com> wrote:

Dear experts
What is the maximum and minimum temperature to be allowed in order to hydrostatic/pneumatic test.
Regards
M.Sajid

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