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[MW:21902] Pneumatic test instead of hydrotest

By Materials & Welding

Dear all

We.need to.conduct HT at 36bar but due to some water disposable prob,

we need to.switched pneumatic test with nitrogen at 30bar.
Line is CS and 1km.dia is 6".

NDE RT  50%.

Is allowed by code 31.3 this  switch over?

Or we need to take 100%RT for.this switch.over?

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