Demagnetizing Gas Piping: Safe Methods Explained

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SUMMARY

The discussion focuses on the safe methods for demagnetizing a 16" .375 wall X52 carbon steel gas pipe that has been depressurized and cold cut for welding. Two primary methods are highlighted: applying heat and using electrical degaussing techniques. The exact temperature for heat application is crucial for maintaining the pipe's integrity, while the electrical method requires clarification on the polarity of the electrodes used. The welding process itself can re-magnetize the pipe, necessitating effective demagnetization before proceeding.

PREREQUISITES
  • Understanding of carbon steel properties and welding techniques
  • Knowledge of degaussing methods and their applications
  • Familiarity with electrical polarity in welding
  • Basic principles of magnetism in metals
NEXT STEPS
  • Research the specific temperature ranges for demagnetizing carbon steel
  • Learn about electrical degaussing techniques and equipment
  • Investigate the effects of welding on magnetized materials
  • Explore safety protocols for working with gas piping systems
USEFUL FOR

Welders, pipeline engineers, safety officers, and anyone involved in the maintenance and repair of gas piping systems will benefit from this discussion.

William Brown
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< Mentor Note -- thread moved to HH from the technical engineering forums, so no HH Template is shown >[/color]

Hello and thank you for your time, OK enough of that Question I have is
(1) A gas pipe in-service 16" .375 wall X52 carbon pipe and has been depressurized & cold cut and to weld a new spool piece to replace old on. At this time it was found to be magnetized. What is the safest way to demagnetize pipe to be welded?
I have read two ways. One is with heat but no one has told me the temperature which could be a factor in the integrity of the pipe and two rapping the lead but which end the positive or negative and which current electrode positive or electrode negative
Please explain in full detail & thank you very much
 
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William Brown said:
(1) A gas pipe in-service 16" .375 wall X52 carbon pipe

I was reading this and thinking what the ?

how can you magnetise a carbon pipe ... then I realized the OP omitted an important word ... steel as in carbon steel :rolleyes:
 
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