[MW:30416] 16-inch diameter at least two welders shall be used

Dear Experts in Pipeline Welding;

Some Standard states for pipelines greater than 16-inch diameter, at least two welders shall be used, operating simultaneously and in opposite quadrants. But as per international standards or codes nowhere mentioned this requirement for the pipeline welding. 

I am interested to know how does above statement requirements profound the integrity of weld joint. What are all the causes if anyhow its not complied?

 

Regards,

PKB.

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