Odorization Equipment Depressurization: Planning and Work Controls
Updated: Sep 11
Odorization equipment should have an operator-approved, equipment-specific basis for isolation, pressure verification, depressurization, vapor control and restoration before maintenance or inspection. The applicable design and work controls depend on the actual system and site.
A closed-loop configuration may reduce planned atmospheric release, but it does not eliminate the need to identify, isolate, verify, and control trapped pressure before maintenance. Depressurization must follow the equipment-specific and operator-approved procedure for the actual system.
Potential project-specific pressure-control methods may include an approved flare, scrubber, recovery arrangement, or closed transfer path. Selection depends on gas and odorant properties, pressure, volume, equipment ratings, discharge destination, permits, and operator procedures.
Flares: A flare may be evaluated for a specific service only under the approved design, operating procedure, siting, monitoring, and permit basis. This article does not establish flare suitability.
Scrubbers:Adsorbent media may be considered for some vapor-control applications only after confirming chemical compatibility, capacity, temperature effects, flow path, pressure boundaries and changeout criteria. Spent media requires a project-specific waste determination and approved handling procedure; a generic article cannot assign its classification or disposal method.
Closed-Loop Systems: Isolate liquid odorant before maintenance, using a pressure source like natural gas or nitrogen. These systems displace odorant to a designated location, avoiding vapor release.
Depressurization requires site-specific isolation, pressure verification, vapor control, qualified personnel, restoration checks, and documentation. BPS provides operational support and documentation, not legal advice or a guarantee of safety, compliance, or emissions performance.
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Plan Depressurization Within the Operating Program
Integrate equipment isolation, depressurization, qualified personnel, documentation, and restoration steps within a site-specific pipeline operations and maintenance program.
