Line Isolation & Weld Testing

ISS offers line isolation and flange weld testing services. We have a full complement of line isolation and weld testing equipment designed to service lines from 3/4" to 36" in diameter and larger. This service allows hot work to be safely performed on open-ended piping by creating a vapor barrier using a double block and bleed isolation plug that isolates hydrocarbon vapor with a through-port vent to prevent back-pressure buildup.

Flange weld testing is another value-added service that can be provided with the same tool. The weld testing is performed by straddling the weld with a seal on each side. The annular space between the seals is pressurized to the desired test pressure. This process takes into account hoop stress and axial stresses. 

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