Which code applies to Welding on In-Service equipment containing Flammables (hot tapping)?

Which code applies to Welding on In-Service equipment containing Flammables (hot tapping)?

• A. API 2201
• B. API 651
• C. API 510
• D. ASME Section V

Answer: (A)

When you have to weld on equipment that is already in service and contains flammable material, the key is to follow a code that specifically covers hot tapping and live-welding procedures. API 2201 provides the guidance for performing welding on in-service lines or vessels with flammable contents, including the safety controls, permit-to-work, fire watch, purge or inerting, and the proper methods to make a branch connection without igniting vapors. This focus on hot tapping and live-work in the petroleum environment is what makes it the appropriate code for these scenarios. The other codes address different topics. API 651 deals with cathodic protection for underground tanks and piping, API 510 covers inspection, repair, and alteration of pressure vessels (in-service) but not the detailed welding practices for hot tapping, and ASME Section V governs nondestructive examination rather than the welding procedures for live, flammable service.

When you have to weld on equipment that is already in service and contains flammable material, the key is to follow a code that specifically covers hot tapping and live-welding procedures. API 2201 provides the guidance for performing welding on in-service lines or vessels with flammable contents, including the safety controls, permit-to-work, fire watch, purge or inerting, and the proper methods to make a branch connection without igniting vapors. This focus on hot tapping and live-work in the petroleum environment is what makes it the appropriate code for these scenarios.

The other codes address different topics. API 651 deals with cathodic protection for underground tanks and piping, API 510 covers inspection, repair, and alteration of pressure vessels (in-service) but not the detailed welding practices for hot tapping, and ASME Section V governs nondestructive examination rather than the welding procedures for live, flammable service.