Dear Mr. Pradeep,
If it is SHELL PLATE you connect both plate without 55 MM gap, the following will happened
Assume your tank Diameter is 25000 Mts., because of your gap adjustment your diameter will decrease around 17 mm from 25000. and the radius will decrease around 8.5 mm.
So, as per API 650, clause 5.5.3 (Roundness tolerance) within the limit.
With regards,
S. SIVASUBRAMANIAN
QA/QC Manager
Larsen & Toubro Kuwait Construction Company
P.O. Box.1082,
Fax: 00965 66321511
From:
Sent: Saturday, February 28, 2009 9:57 AM
To:
Subject: [MW:1663] Buttering on Plate
Dear All!!!
We are doing some Tanks as per API 650. In one of that tank ,we faced a problem like shortened the lingth of plate..and JOINT GAP became more than the required 'Root gap'. Almost "55mm" we got .So we thought about 'Buttering'. But in API 650 not mentioned any thing about 'buttering'. So which standard we have to follow for it, and what are the test we have to conduct over there.
There was no PWHT as per WPS,Pre heat was only upto 40 ^0 C.
plate thickness is 23.4mm- 'Double 'v' groove' , ASTM 573.GR 70.
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PRADEEP KUMAR HORMIS
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