Dry Gas Seal Systems System Design Considerations

One of the main functions of the seal gas system is to supply clean (filtered) dry gas to the primary seal. Figure 8-15 shows a typical seal gas mum

Figure 8-15. Typical dry gas seal system schematic for a tandem arrangement dry gas seal.

Figure 8-15. Typical dry gas seal system schematic for a tandem arrangement dry gas seal.

system for a tandem seal arrangement. Note the optional secondary seal gas supply to be used with tandem seal having an internal baffle. Figure 8-16 shows a typical seal gas system for a double-opposed seal arrangement. The source of the seal supply (tandem) and buffer gas (double) is normally compressor discharge gas, but is not limited to that source. An alternate supply of gas may be required for startup, if the suction side of the compressor can go sub atmospheric. The system design pressure must be able to accommodate the higher of either settle out pressure or system relief pressure. Care must be taken to exclude all liquids from any of the

SEAL CAS SUPPir

SEAL CAS SUPPir

Figure 8-16. Typical dry gas seal system schematic for a double-opposed arrangement dry gas seal.

buffer streams. This may require heat tracing or liquid knock-out provisions and sometimes both. The material of construction is normally austi-netic stainless steel. For many of the systems, stainless tubing will be adequate (see Figure 8-17). When pressures are high or the system is very large, rigid stainless pipe is required.

Figure 8-17. Dry gas seal console. (Courtesy ofA-C Compressor Corporation)
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