Compressor technology and reliability
STORAGE, HANDLING & DISTRIBUTION GAS HANDLING AT LNG TERMINALS
BURCKHARDT COMPRESSION
Compressor technology and reliability
Across the LNG landscape, compressors play a crucial role in the efficient transport and storage of gas. Their continued reliability and efficiency are essential for effective operations in modern gas supply networks. Ageing assets can benefit from upgrades and overhauls that use the latest materials and reverse engineering techniques to update compressors and extend their service life. Even if different manufacturers supplied the original equipment, it is possible to find expertise and knowledge from a single source that can support a variety of machines and keep downtime to a minimum.
Rakesh Kulkarni, Engineering Sales Manager at Burckhardt Compression, looks at landbased compressors and how their performance can be improved.
Downstream applications in LNG terminals predominantly use oilfree reciprocating compressors. These avoid the need for lubrication systems and filter maintenance as making oil separation and gas filtration technologies unnecessary, guaranteeing the cleanliness of the heat exchangers and high-pressure re-liquefaction system.
Managing boil-off gas
Oil-free compressors are integral to the efficient and safe operation of LNG terminals. Their primary function is to manage boil-off gas( BOG)— the vaporized LNG that results from ambient heat absorption during storage and transportation. By compressing BOG, these compressors enable its re-liquefaction or use as fuel, minimizing product loss and reducing emissions.
Accurate data collection is crucial for identifying maintenance issues
Oil-free reciprocating compressors are favored for this role due to their ability to handle cryogenic temperatures, with inlet gas temperatures reaching as low as-170 ° C. They are designed with specific materials for wear components, such as piston rings and seals, to ensure reliability and minimize maintenance under these extreme conditions.
Common designs such as the Laby ® and the Laby ® GI have been developed by Burckhardt Compression. These compressors are specifically designed for both landbased and marine LNG applications. They can compress gas to 300 bar without cylinder lubrication, making them suitable for both reliquefaction processes and on-board vessels with dual-fuel engines.
Managing the local energy grid
Once BOG is reliquefied or used as fuel, the processed natural gas can be introduced into the distribution grid. This integration ensures a continuous supply of natural gas to meet consumer demand, enhancing the flexibility and reliability of the energy supply chain. Compressors are also used for transport over longer distances and at local storage and delivery stations to maintain gas pressure.
This entire infrastructure should be properly maintained to ensure safe and reliable operation, leading to decades of dependable service. However, ageing assets will eventually need more significant interventions if they are to continue working without being replaced.
Experienced service providers can provide comprehensive revamps, including reverse engineering parts and introducing upgraded materials.
Comprehensive assessments
The event that determines the need for an intervention can range from a change in local legislation, such as emissions regulations, to an unplanned outage that affects
92 PECM Issue 78