Re: Circumferential Welding Space on Piping

From: <mapte@technip.com>
Date: Tue Feb 10 2004 - 23:28:00 EST

It is 4 times the thickness as per ASME section VII. B31.3 see para 331.2.6 & 330.1.4 the heat affected zone is 1". So 50mm or 4t which ever is greater is OK (Make sure that this is the clear distance beteween the welds.)
Also refer to your client specifications, some clients have a more stringent requirement like 5t etc.

Weld clearence is required for following:

1. Avoid overlapping of heat affected zones.
2. Allow some space for clamping to the welder for alignment
3. Allow some space for radiography.

However, if in some specific case it is not possible heat treatment of that joint (with clients consent) is also an accepted solution.

Have a nice day.
-Mandar.
This message comes from Mandar's desk.

                       "Satria, Utama"
                       <satriau@BP.com>         To:      "PipingDesign (E-mail)"
<PipingDesign@yahoogroups.com>
                                                cc:
                       02/11/2004 07:21         Subject: [PipingDesign]
Circumferential Welding Space on Piping
                       AM
                       Please respond
                       to PipingDesign

Dear Guys ;

Do you know what is the minimum space between 2 Circ. weld on Carbon Steel Pipe A 106. The size is 6" SCH 80. As a know the rule of thumb is 1D but as extreme we may chose 1 1/2" at the least as long the HAZ is not overlaping ! Is that right ?

Thanks

Best Regards,

Satria Utama Relianto
Mechanical Engineer
Discipline Engineering
Facilities Enhancement
BP Indonesia Business Unit
< email : satriau@bp.com > Telp. + 62 ( 21 ) 78548451
Fax. + 62 ( 21 ) 78549053

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[Non-text portions of this message have been removed] Received on Tue Feb 10 23:28:00 2004