API PLANS A027
A series of recommendations and drawings for the installation of hardware and piping to provide a control of the seal environment in, and surrounding the pump stuffing box area.
These drawings reflect piping arrangements that have historically been used in the petroleum industry. Not all of the plans are recommended or referenced in the API Standard.
- Plan 01. A line from the pump discharge to the seal. Often called discharge recirculation
- Plan 02. Dead-end the stuffing box. Use the cooling jacket
- Plan 11. Discharge recirculation through an orifice into the gland flush connection.
- Plan 12. Discharge recirculation through a strainer and control orifice to the gland flush connection.
- Plan 13. Suction recirculation from the bottom of the stuffing box, through a flow control orifice, to the suction piping.
- Plan 21. Discharge recirculation through a flow control orifice and cooler into the seal chamber
- Plan 22. Discharge recirculation through a strainer, orifice and a cooler to the stuffing box.
- Plan 23. Pumping ring in stuffing box, pumping stuffing box fluid through a cooler, back to the stuffing box.
- Plan 31. Discharge recirculation through a cyclone separator to the stuffing box
- Plan 32. Flushing fluid from an external source to the seal
- Plan 41. Discharge recirculation through a cyclone separator, and cooler to the stuffing box.
- Plan 51. External reservoir providing a dead ended blanket of fluid to the quench connection of the API gland
- Plan 52. External reservoir providing buffer fluid for the outer seal of an un-pressurized dual seal arrangement. During operation an internal pumping ring provides circulation. The reservoir is connected to a vapor recovery system and is maintained at a pressure less than the pressure in the seal chamber.
- Plan 53. Pressurized external barrier fluid reservoir supplying clean fluid to the seal chamber. Circulation is by an internal pumping ring. Reservoir pressure is greater than the process pressure being sealed. Typically used with a tandem dual seal.
- Plan 54. Pressurized external barrier fluid reservoir or system supplying clean fluid to the seal chamber. Circulation is by an external pump or pressure system. Reservoir pressure is greater than system pressure being sealed. Typically used with tandem dual seal
- Plan 61. Tapped connect for purchaser’s use. (flush connection)
- Plan 62. External source providing a quench. Typically used with a close fitting bushing
The ANSI standard does not have a similar plan reference.