Controlling Compressor Emissions
Across the natural gas industry, measuring and controlling fugitive emissions has become a priority – to comply with regulations and to maximize natural gas recovery.
The experts at Cook Compression can provide a full system assessment and consult with operators on options to meet company objectives.
Identifying the Source of Emissions
Compressor emissions often originate from multiple sources, and several measures may be needed to achieve the desired level of control.
The most common source of fugitive emissions is the packing case:
- Along the piston rod
- Through the packing case nose gasket
- Between packing case cups
Other sources of fugitive emissions from the compression cylinder may include:
- Oil wiper packing
- Valve cover gaskets
- Valve unloader packing
- The distance piece vent/drain
Comprehensive Emissions Solutions
To reduce compressor leakage, Cook Compression offers a broad line of engineered packing case upgrades, including low-emissions rod rings, shutdown seals and purge gas systems. We also offer upgrades to address valve-related leakage, including a high-strength valve retainer.
Flow testing can be used to accurately quantify compressor seal leakage, both for the reporting of emissions data and for the comparison of upgrade options.
Best Practice Maintenance
Emissions compliance can be significantly improved through implementation of maintenance best practices for the compressor and its wear components.
For the packing case, best practices include:
- Upgrading the nose gasket to a spiral-wound gasket design
- Replacing double-acting vent seal rings with side-loaded vent seal rings
- Lapping the mating faces of the individual packing cups
- Verifying cup faces’ parallelism, cup depths, pressure packing ring clearances, piston rod surface finish, and packing case alignment
- Ensuring that proper flange bolt tightening procedures are being used
Related Case Study
California Gas Producer Hits Emissions Target with Cook
To help a major gas producer meet local requirements to reduce cylinder emissions on 90% of its reciprocating compressors, Cook Compression implemented a comprehensive upgrade of cylinder-end components. At the heart of the upgrade was the COOK CLEAN packing case – a solution that also significantly improved packing case life.