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Tech/Engineering - Petroleum Eng/Sci / Pipeline | | English term or phrase: encirclement welded split sleeve | Out of Service welding and cutting
All maintenance welding of hydrogen pipelines shall be to the same standards and requirements called for in the construction section above.
A weld that cannot be repaired as outlined above may be repaired by installing a full encirclement welded split sleeve using circumferential fillet welds or cutting out and replacing that section of pipe.
If a segment of a pipeline is repaired by cutting out the damaged portion of the pipe as a cylinder, the removed section should be cut at least two pipe diameters on each side of the defect or weld.
The replacement pipe must be of comparable strength and metallurgy and be suitable for the hydrogen service at the intended maximum allowable working pressure (MAWP). The replacement section of pipe must be pre-tested to match the MAWP of the pipeline.
All field girth butt welds not strength tested must be radiographically examined after installation.
Cold cutting of pipelines for tie-in and repairs is preferred to reduce the possibility of ignition keeping in mind that this does not reduce any of the requirements for safe maintenance activities. |
| | | Selected response from:
Airton J Souza
Brazil
Local time: 00:38
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