Detail Piston Rod Pressure Packing
Different designs are proposed :
- with leaked gas recovery ( venting) , mainly for process gases ( inflammable, sour, toxic, wet or costly gases) .
- with ( lubricated packing case) or without lubrication ( dry packing case) according to the process specifications or as requested by the user.
- with internal cooling. The cooling of the packing cases is particularly recommended when working dry or at very high pressures.
- with inert buffer gas ( in accordance to API 618 ) , to minimize residual leakage of the process gas. The packing case is equipped with a chamber into which is introduced an inert gas ( usually nitrogen) at a higher pressure than the venting pressure.
- with inert purge gas ( in accordance to API 618 ) . This alternative is based on the same principle as the inert buffer gas, in this case, however, the packing case has an inert gas inlet and outlet ( there is only an inlet for the buffer gas) .
- with oil recovery in the case of combined packing cases.
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