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Dead Legs

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Dead Legs are areas of a piping system that rarely see flow, yet are still exposed to process, even if not explicitly cut off. In an effective asset integrity management program dead legs should be monitored closely because they are especially prone to contamination and corrosion.

Dead legs are often lines closed by welded caps, flanges, or other fittings. Though they can also take the form of blanked branches, lines with normally closed block valves, lines with one end blanked, pressurized dummy support legs, stagnant control valve bypass piping, spare pump piping, level bridles, relief valve inlet and outlet header piping, pump trim bypass lines, high-point vents, sample points, drains, bleeders, and instrument connections.

It is important to have established protocols for identifying and monitoring all dead legs in a facility. Dead legs should be removed from a system when possible, or at least isolated and drained regularly. Doing so should should lead to improvements in performance. If removing deadlegs isn’t possible, then measures should be taken to continuously monitor them for corrosion and other damage.

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Articles about Dead Legs
Blog

By optimizing the scarce SME resource time and focusing their efforts, SMEs can spend time on the things that are most important, such as why a problem occurs, as well as identifying possible solutions to problems.

Authors:
November/December 2021 Inspectioneering Journal

Dead legs pose a substantial threat to piping integrity as they are especially prone to contamination and corrosion. Tracking dead legs separately from the mainline piping should be done through controlled procedures at operating facilities.

November/December 2016 Inspectioneering Journal

This article describes a high-level dead leg integrity management program overview and is based on experience, knowledge, and adaptation of inspection management philosophies currently being implemented within the Oil & Gas and the petrochemical...

Authors: Mohamed Amer
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