Fatigue cracking of high pressure oil tube

• High pressure pipe failed by fatigue in the fusion line of longitudinal weld.
• Fatigue was caused by vibration of the line due to clamp missing.
• Crack initiated and propagated through the high concentration region of weld joint.
• Change of specified material (UNS S31803) by AISI 304L contributed to the failure.
• As recommended, seamless tube of duplex stainless steel must be used.

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