RE: [MW:11492] VACUUM TEST FOR SOTRAGE TANKS ROOF AS PER API 650

Dear John,

 

If the roof is not having atmospheric vent, you have to test roof in following way mentioned in API 650 2010 7.3.7.1

 

7.3.7 Testing of the Roof

7.3.7.1 Upon completion, the roof of a tank designed to be gas-tight (except for roofs designed under 7.3.7.2, F.4.4, and F.7.6)

shall be tested by one of the following methods:

a. Applying internal air pressure not exceeding the weight of the roof plates and applying to the weld joints a bubble solution or

other material suitable for the detection of leaks.

b. Vacuum testing the weld joints in accordance with 8.6 to detect any leaks.

7.3.7.2 Upon completion, the roof of a tank not designed to be gas-tight, such as a tank with peripheral circulation vents or a

tank with free or open vents, shall receive only visual inspection of its weld joints, unless otherwise specified by the Purchaser.

 

For B, its simple to do Vacum box test

For A, you can make the internal pressure ( By U tube manometer, may be it will be 50 or 60 mm of water column) during the hydrotest.

 

With regards,

S. Sivasubramanian.

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Rajagopal Kannan
Sent: Monday, June 27, 2011 1:31 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:11488] VACUUM TEST FOR SOTRAGE TANKS ROOF AS PER API 650

 

Dear John,

No, Roof do not require vacuum testing. If you have access to both the sides of roof, you can deploy and NDT for weld examination.

Thanks and best Regards,

K.Rajagopal

On Sun, Jun 26, 2011 at 10:25 AM, manoj john <manojacgnr@gmail.com> wrote:

Dear All experts,

Please give me information about vacuum test of roof for storage tanks
as per API 650.

I am fabricating sotrage tanks as per API 650 with fixed roof with
open vent nozzle and designed for Atmospheric pressure.

My doubt is whether this tank roof require vacuum testing as per API 650.


Thanks and Best Regards.

John Abraham

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