650-2021

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This document is under review as revision to an API Standard; it is under consideration within an API technical committee but has not received all approvals required
for publication. This document shall not be reproduced or circulated or quoted, in whole or in part, outside of API committee activities except with the approval of the
Chairman of the committee having jurisdiction and staff of the API Standards Dept. Copyright API. All rights reserved.
650-2021
Title: Eliminate Reference to EGW in 5.1.3.6.1(b)
Date:
Dec 31, 2014
0
Revision:
Handled By:
Doug Miller
Chicago Bridge and Iron Company
14105 S. Route 59
Plainfield, IL 60544-8984
Telephone: 815-439-6522
Fax: 815-439-6560
Email: [email protected]
__________________________________________________________________________________________
Purpose:
Eliminate a pointless exception and cross-reference.
Source:
D. Miller Dec. 31, 2014 email to B. Roberts as prompted by a user editorial cross reference
correction notification.
Impact:
Cleanup of the API 650 document.
Discussion:
A user pointed out that in 12th ed, paragraph 5.1.3.6.1 b, reference to “7.2.3.4” should actually be to
“7.2.3.5”. That is a correct observation as verified by checking the cross referencing arrangements back
in the 11th edition. This cross referencing update was missed when 7.2.3.3 was inserted.
However, I note that the connection between 5.1.3.6.1 b and “7.2.3.5” actually does not make sense.
That's because 5.1.3.6.1 only addresses bottom, roof and shell to bottom welds. 7.2.3.5 addresses only
circ and vert welds in the shell. Given the scope of 5.1.3.6.1, there is no reason to bring up 7.2.3.5 as an
exception. I found that 5.1.3.6.1 was created by the PIP item (650-524). See attached. Someone felt the
need to have an electrogas exception (note green), but it was not really needed. We should take out "with
the exception for electrogas welding in X.X.X.X" from the current 5.1.3.6.1.b.
From the PIP agenda item 650-524 Draft 71
3.1.3.6 Weld passes are restricted as follows:
3.1.3.6.1 For bottom plate welds and roof plate welds for all
materials, and for shell-to-bottom welds for Groups I, II, III, and IIIA
materials, the following weld size instructions requirements apply:
a) For manual welding processes, fillet weld legs or groove weld depths with
legs greater than 6 mm (1/4 inch) shall be multipass, unless otherwise
specified on the Data Sheet, Line 15
b) For semi-automatic and automatic welding processes, with the
exception for electrogas welding in 5.2.3.4, fillet weld legs or groove weld
depths with legs greater than 10 mm (3/8 inch) shall be multipass, unless
otherwise specified on the Data Sheet, Line 15
3.1.3.6.2 For Groups IV, IVA, V, or VI shell-to-bottom welds for all welding
processes, all welds shall be made using a minimum of two passes.
650-2021
page 1 of 2
This document is under review as revision to an API Standard; it is under consideration within an API technical committee but has not received all approvals required
for publication. This document shall not be reproduced or circulated or quoted, in whole or in part, outside of API committee activities except with the approval of the
Chairman of the committee having jurisdiction and staff of the API Standards Dept. Copyright API. All rights reserved.
Proposed Changes:
The red deletion is the only change to API 650 proposed in this agenda item.
5.1.3.6.1
For bottom plate welds and roof plate welds for all materials, and for shell-tobottom welds for Groups I, II, III, and IIIA materials, the following weld size requirements
apply:
a) For manual welding processes, fillet weld legs or groove weld depths greater than 6 mm
(1/4 in.) shall be multipass, unless otherwise specified on the Data Sheet, Line 15.
b) For semi-automatic, machine, and automatic welding processes, with the exception for
electro-gas welding in 7.2.3.4, fillet weld legs or groove weld depths greater than 10 mm
(3/8 in.) shall be multipass, unless otherwise specified on the Data Sheet, Line 15.
Below quotation of sections 7.2.3.4 and 7.2.3.5 is provide simply for reference. Note that I'm sure that the
current 7.2.3.5 is addressing Electro-gas welding even though it does not say that directly.
7.2.3.4
The reverse side of double-welded butt joints shall be thoroughly cleaned in a
manner that will leave the exposed surface satisfactory for fusion of the weld metal to be
added, prior to the application of the first bead to the second side. This cleaning may be
done by chipping; grinding; melting out; or where the back of the initial bead is smooth and
free from crevices that might entrap slag, another method that, upon field inspection, is
acceptable to the Purchaser.
7.2.3.5 For circumferential and vertical joints in tank shell courses constructed of material
more than 40 mm (11/2 in.) thick (based on the thickness of the thicker plate at the joint),
multipass weld procedures are required, with no pass over 19 mm (3/4 in.) thick permitted.
650-2021
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