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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Hi John, If you are fabricating the tanks with the open vents you must follow as per API 650,,7.3.7.2,which states below: 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. Thanks and Regards, |
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: material...@googlegroups.com
[mailto:material...@googlegroups.com] On Behalf Of Rajagopal
Kannan
Sent: Monday, June 27, 2011 1:31 PM
To: material...@googlegroups.com
Subject: Re: [MW:11488] VACUUM TEST FOR SOTRAGE TANKS ROOF AS PER API 650
Dear John,
Dear Experts,
we are fabricating a dome roof oil tank with atmospheric venting this vent connected to the flame arrester, in this case, roof air test is required or not???
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
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Hi
Based on your information, the tank is not open to atmosphere, since there is a flame arrester will be installed. Hence roof pneumatic test is required.
Refer approved GAD and design calculation of Client for more clarity.
Regards
Govindan P
Dear Experts,
we are fabricating a dome roof oil tank with atmospheric venting this vent connected to the flame arrester, in this case, roof air test is required or not???
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
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Kind Regards
PINTO ANTONY.T