8.2 WELDING AND HOT TAPPING

8.2.1 GENERAL

All repair and alteration welding shall be done in accordance with the principles of ASME B31.3 or the code to which the piping system was built.

Any welding conducted on piping components in operation shall be done in accordance with API 2201. The inspector shall use as a minimum the ‘Suggested Hot Tap Checklist’ contained in API 2201 for hot tapping performed on piping components.

8.2.2 PROCEDURES, QUALIFICATIONS AND RECORDS

The repair organization shall use welders and welding procedures qualified in accordance with ASME B31.3 or the code to which the piping was built.

See API 577 for guidance on welding procedures and qualifications.

The repair organization shall maintain records of welding procedures and welder performance qualifications and be available to the inspector prior to the start of welding.

8.3 RE-RATING

Re-rating piping systems by changing the temperatures rating or the MAWP may be done only after conforming to requirements:

1. calculations are performed by piping engineer or inspector.
2. all re-ratings piping system shall be established in accordance with the original construction code requirements or by computation using the appropriate methods in latest edition of applicable code.
3. current inspection records verify that the piping system is satisfactory for the proposed service conditions and that the appropriate corrosion allowance is provided.
4. rerated piping systems shall be leak tested in accordance with construction code or latest applicable code for the new service conditions, unless documented records indicate a previous leak test was performed at greater than or equal to the test pressure for the new condition.
5. the piping system is checked to affirm that the required pressure relieving devices are present, are set at the appropriate pressure and have the appropriate capacity at set pressure.
6. the piping system re-rating is acceptable to the inspector or piping engineer.
7. all piping components in the system (such as valves, flanges, bolts, gaskets, packing and expansion joints) are adequate for the new combination of pressure and temperature.
8. piping flexibility is adequate for design temperature changes.
9. appropriate engineering records are updated.
10. a decrease in minimum operating temperature is justified by impact test results, if required by the applicable code.

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