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nhabibkhan
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Join Date: Jun 2007
Location: Lahore, Pakistan
Posts: 24

Hydrostatic Test Procedures

03/11/2009 5:09 AM

Please share your knowledge regarding Hydrostatic Test Procedure, temperature and Pressure, MAWP & MAP

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 "My Lord! truly, I'm in need of whatever good that You bestow on me!". Static Eqyuipment Design Engineer
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jdretired
Guru
Engineering Fields - Marine Engineering - New Member

Join Date: May 2007
Location: Australia.
Posts: 1642
Good Answers: 81
#1

Re: Hydrostatic Test

03/11/2009 7:00 AM

It has been a long time since I was involved in a hydrostatic boiler test. But the most important thing at the time was to fill the boiler slowly, so as not to have any ingress of air. The reason being, if any one doing an inspection does a close inspection of a crack, the air could cause a high pressure stream of water to damage or blind the person. As for the other points others will need to fill in.

Regards JD.
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Dilip Kumar Singh
Member

Join Date: Jan 2009
Location: Navi Mumbai
Posts: 9
Good Answers: 1
#2

Re: Hydrostatic Test Procedures

03/12/2009 12:29 AM

Hydortest of pressure vessels, heat exchangers etc is done to check the integrity of the vessel welds. It is used to check the strength of welds weather there are leakage or not from the welded parts.

Now the important question is at what pressure hydrotest to be performed. The answer is simple P( hydrotest) = 1.3*Design pressure if u have not calculated MAWP or MAP.

MAWP = it is maximum allowable working pressure in hot and corroded condition. This is the maximum pressure a vessel + its components can sustain in normal operating condition.

MAP = it is maximum allowable pressure in new and cold condition. This is the maximum pressure a vessel + its components can sustain in the new condition.

Now if u have calculated both MAWP and MAP then the equation for hydrotest pressure will be:

P(Hydrotest)= 1.3 * MAWP

This is to hydotest the vessel at site

P(Hydrotest) = 1.3 * MAP

This is to hydrotest the vessel at shop

Hydrotest temperature should be 17 degree celcius above minimum design metal temperature.

If u want some other information then u can refer ASME Section V111 Div1 UG99 for hydrotest of pressure vessels.
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dhayanandhan
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Engineering Fields - Mechanical Engineering - New Member

Join Date: May 2008
Location: CHENNAI, TAMIL NADU, INDIA.
Posts: 1851
Good Answers: 65
#4
In reply to #2

Re: Hydrostatic Test Procedures

11/24/2013 9:57 AM

Dear Mr.Dilip Kumar Singh,

You have pointed tout the actual norms for Hydro Static Test which is MAP or MAWP x 1.3

About 2 decades back - there was a school of thought which emphasised that the Test Pressure for Cold Condition Testing should be so calculated and buid up for hydrostatic testing such that the SAME AMOUNT of STRESS IS INDUCED IN THE PRESSURE PARTS,WHILE WORKING AT HOT CONDITION.

If at all any pressure part fails let it happen in shut down condition and NOT WHILE WORKING, which will affect the Production Schedule.

Accordingly the TEST PRESSURE to MWAP WORKED OUT as 2.18 and the Boiler worked for more than 30 yerars.

DHAYANANDHAN.S
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dhayanandhan
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Engineering Fields - Mechanical Engineering - New Member

Join Date: May 2008
Location: CHENNAI, TAMIL NADU, INDIA.
Posts: 1851
Good Answers: 65
#5
In reply to #2

Re: Hydrostatic Test Procedures

11/24/2013 10:41 AM

Dear Mr.Dilip Kumar Singh,

In my post No.4 above there is a typing error.

Instead of typing "YOU HAVE POINTED OUT THE ...." I have typed "You have pointed tout " that is instead of POINTED OUT it is typed as POINTED TOUT.

Pl. ignore this error. I regret for this error.

DHAYANANDHAN.S
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takle
Associate

Join Date: Jun 2008
Posts: 25
#3

Re: Hydrostatic Test Procedures

03/15/2009 10:54 AM

Hydrotest procedures are varying from country to country. Test pressure would be 1.3 to 1.5 times the working pressure.
Fill the presure vessel with the water by removing air from top most portion. Raise the pressure as per conditions and check for steady pressure, weld joints etc carefully.
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