Distance between two weld joint

[siva Guru]

Dear All

Can you advice, 

two weld  joint how much Min distance between weldjoints.

Please clarify, if possible please provide code reference.

Best regards

Guru

[Hernan Arturo Castillo Mier]

Hello:

 

 

 

 

 

 

 

Hernán Castillo Mier

Ingeniero Senior Confiabilidad e Integridad

FACILITADOR AUTORIDAD TÉCNICA EQUIPO ESTÁTICO

INSPECTOR AUTORIZADO

API 510 (33119)

Avantel: 8*1571

Teléfono: 668-2396

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[Kannayeram Gnanapandithan]

Ref BSEN 15952-5

[Adam Janzeer]

Dear ALL 

As per my knowledge, It's a good engineering practice mostly highlighted on our project specification or client procedure.

For your reference refer below clause extracted from SHELL DEP 31380131

3.3 ASSEMBLY OF PIPING COMPONENTS
For butt-welding of all piping components (e.g. pipe ends, fittings and welding neck
flanges), a uniform root gap shall be provided as specified in the relevant Welding
Procedure Specification.
Flange bolt holes shall straddle the vertical centerline of the pipe where the flange is
installed vertically, and the north-south line where the flange is installed horizontally.
Refer to DEP 31.38.01.11-Gen. for flange misalignment acceptance criteria of misalignment
of flanges.
The minimum distance between the edges of two pressure-containing welds shall be twice
the wall thickness of the thicker pressure part. The same requirement applies to the
distance between non-pressure attachment welds and a pressure-containing weld in order
to allow non-destructive inspection of the pressure-containing weld.

Longitudinal welds in two adjacent pipes should be 180° apart, but in any case shall be separated
by at least twice the wall thickness of the thicker pipe. When pneumatice leak test in accordance
with ASME B31.3, para. 345.4 is performed in lieu of hydrostatic leak test, the minimum spacing of
the longitudinal welds SHALL [PS] be followed.

If the pipe contains a longitudinal weld, this weld SHALL [PS] not be located at the bottom of the
pipe after installation; it should be located at least 45° from the bottom of the pipe.

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[Maha Charu]

Good info

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[mohsin tufail]

20mm or three times of the wall thickness which is greater

[Adam Janzeer]

Dear moshin

Based on which reference....

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[mohsin tufail]

reference aramco standard w-11 

11.1

The minimum distance between parallel butt welds shall be 20 mm or 

three times the wall thickness of the joint, whichever is greater

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[atul khatri]

Dear Siva,

You must be aware that min. separation distance between two welds is to isolate there heat affected zone (HAZ).

HAZ depends on so many factors out of which thickness is the key one.

So as Mohsin and Adam suggested, these requirements are mainly guided by client's specifications based on their practical experiences or lesson learnt. 

So you could take gap between two welds as maximum between 50 mm (based on good engineering practice), twice the wall thickness of the thicker pressure part (As Adam advised) and 20 mm or three times the wall thickness of the joint (as Mohsin advised).

If you go with the above for sure you will not face any issue.

Also take note that if you are asking about the weld joints for piping spool, it will be good to have the minimum spool length as equal to pipe nominal diameter for 6" and above and for lesser size it should be 100 mm. 

Thanks

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[Kannayeram Gnanapandithan]

As per DIn EN 12952-5,(2012) 8.1.7. should be greater than 40mm

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[Paidi]

Dear Shiva

Please see your project specification ....Distance between weld join will varies as per Client standards... 

In general ..3 times of WT should be required ...

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Thanks  & Best Regards,

Suresh Paidi