Verified gap of socket weld?

Why we need to verify the gap of socket weld?

To permit the thermal expansion of pipe during welding operation.

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Thanks and one more questions:

  1. Max. and Min. in mm are allowed?
  2. Which NDT method application to check the gap?

Generally 1.5mm before welding & i dont know in depth.
RT is used for measuring the gap after welding.

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Only shot a film to verify the gap, no IQI selection, right?
In this case, we also review the throat thickness of fillet weld.

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1/16" before welding (aprox) and what should be done in case after RT “no gap” is verified.
Is it acceptable, It is not, Why?

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Its depends.
The reason behind this gap is to avoid unwanted shear stress in the fillet and possible cracking during operation, especially those high-temperature service when pipe inside the socket will expand to a greater degree than the socket itself.

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I know that, this was not my question.
What should be done in case after RT “no gap” is verified.
Is it acceptable, it is not? Why.

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I consider on fatige cracking during operation due to thermal expansion.

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in my opinion, check the gap and throat thickness of fillet weld.
In case of RT films did not find the the gap, it should repair.

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Please share the common acceptance criteria?

Hi @Aravind_km and @dinhhoan05
Any advice for this.