Dry gas seal contamination prevention system

F - Mech Eng,Light,Heat,Weapons – 16 – J

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F16J 15/34 (2006.01) F04D 29/12 (2006.01)

Patent

CA 2196901

A seal gas pressure booster system for use with a gas compressor, particularly of the type used for boosting pressure in gas transmission, process or utility industries and which contains pressure about the shaft/casing interface with the use of dry gas seals. Seal supply gas is supplied from the discharge side of the compressor. During normal operation, sufficient head across the compressor exists to supply the necessary flow of seal supply gas against the restrictions provided by the filters, interconnections and components in the seal gas supply system. During startup, or during modes of operation where insufficient head across the compressor does not exist, the pressure booster system increases the pressure of a stream of compressor discharge gas to provide the necessary pressure differential to supply the dry gas seal with a continuous flow of clean, filtered gas.

L'invention concerne un dispositif (57) surpresseur pour la pression d'un gaz d'étanchéité pour un compresseur à gaz (10), notamment du type qui est utilisé pour accroître la pression dans les industries de transport, de transformation ou de distribution du gaz et qui retient la pression autour de la jonction entre la chemise et l'arbre au moyen de joints d'étanchéité secs à gaz (22). Le gaz d'alimentation (42) des joints d'étanchéité provient du côté de décharge du compresseur (64). Pendant le fonctionnement normal, il y a suffisamment de différence de pression à travers le compresseur (10) pour assurer l'écoulement nécessaire du gaz à l'encontre des obstacles créés par les filtres (32), les raccords et les éléments dans le système d'alimentation en gaz. Pendant le démarrage, ou au cours des modes de fonctionnement pendant lesquels il y a suffisamment de différence de pression à travers le compresseur, le dispositif surpresseur de pression (57) augmente la pression d'un courant de gaz de décharge du compresseur pour fournir la différence de pression nécessaire pour apporter aux joints d'étanchéité secs à gaz (22) un flux continu de gaz propre et filtré.

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