Thermal Systems

Compressor Seal Systems

Compressor seal systems prevent process gas from escaping along the shaft of a compressor to the atmosphere — a critical function in any application where the gas being compressed is flammable, toxic, explosive or valuable. Whether using wet seals with barrier fluid or dry gas seals with seal gas, the sealing system is one of the most maintenance-sensitive components in a gas compressor installation, and barrier fluid selection directly affects seal performance, reliability and service life.

NEXT Lubricants supplies barrier fluids for compressor seal systems across gas processing, petrochemical, pipeline and industrial gas compression applications.

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Compressor Seal Systems — Operation, Applications & Barrier Fluid Role

Gas compressor shaft seals prevent process gas from leaking along the compressor shaft to the atmosphere or into the bearing housings. In wet seal systems — widely used in centrifugal compressors across oil and gas, petrochemical and pipeline applications — a pressurised barrier fluid is injected at the seal faces at a pressure above the process gas pressure, preventing gas from migrating outward. The barrier fluid absorbs a small amount of process gas at the inner seal face and is returned to a degassing system before being recirculated. In dry gas seal systems, a controlled flow of clean seal gas maintains the gap between seal faces without liquid barrier fluid — though support fluid is still used in the bearing and lubrication systems.

Barrier fluid selection for wet seal compressor systems requires matching the fluid viscosity, thermal stability and compatibility with the process gas to the operating pressure, temperature and speed of the specific compressor. Process gas dissolves into the barrier fluid at the inner seal face — the extent of this dissolution, and its effect on barrier fluid viscosity and physical properties, depends on the gas composition and operating pressure and must be considered in fluid selection. In sour gas or reactive gas service, chemical compatibility between the barrier fluid and the process gas components is an additional requirement.

Natural Gas Pipeline Compression

Centrifugal compressors on natural gas transmission pipelines use wet seal or dry gas seal systems with barrier fluid support across high-pressure, continuous duty applications where seal reliability is a pipeline availability requirement.

Refinery & Gas Processing

Process gas compressors in oil refineries and gas processing plants use compressor seal systems across a range of gas compositions and pressures, where barrier fluid compatibility with the specific process gas and seal operating conditions governs fluid selection.

Sour Gas & Acid Gas Service

Industrial facilities recover waste heat from exhaust gases, process streams and cooling systems using thermal oil as the transfer medium, capturing energy that would otherwise be lost and redistributing it to process heating or power generation applications.

Offshore & Subsea Compression

Offshore platform and subsea compressors use compact, high-reliability seal systems where barrier fluid performance under offshore operating and maintenance conditions is a key consideration in fluid selection and system design.

Related Applications

Explore Other Barrier Seal Applications

Compressor seal systems are one part of a broader barrier seal and fluid landscape. NEXT Lubricants also supports the following application.

Dual Mechanical Seal Systems (API Plan 52 & 53)

Barrier and buffer fluids for dual mechanical seal systems in pumps, mixers and agitators across chemical processing, pharmaceutical, food and industrial rotating equipment applications.