In order to make best use of mechanical seals, appropriate auxiliary equipment and piping are required. The sketches shown on the right exemplify different piping arrangements. Numbering is based on the api standard. (API 610-8th, API 682-1st)

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API PLAN Drawings of piping & Seal chamber API PLAN Drawings of piping & Seal chamber 01 Integral (internal) recirculation from pump discharge to seal. 02 Dead-ended seal chamber with no circulation of flushed fluid. 11 Recirculation from pump discharge through a flow control orifice to the seal. 12 Recirculation from pump discharge through a strainer and flow control orifice to the seal. 13 Recirculation from pump discharge through a strainer and flow control orifice to the seal. 14 Recirculation from pump discharge through a flow control orifice to the seal and back to the pump suction. 21 Recirculation from the pump discharge through a flow control orifice and a cooler, then into the seal chamber. 22 Recirculation from the pump discharge through a strainer, a flow control orifice, and a cooler and into the seal chamber. 23 Recirculation from the pumping ring in the seal chamber through a cooler and back to the seal chamber. 31 Recirculation from pump discharge through a cyclone separator delivering the clean fluid to the seal chamber. 32 Flush is injected into the seal chamber from an external source. 41 Recirculation from pump discharge through a cyclone separator delivering the clean fluid a cooler and then to the seal chamber. 51 External reservoir providing a dead-ended blanket of fluid to the quench connection of the gland. 52 External reservoir providing buffer fluid for outer seal of an unpressurized dual seal arrangement. Circulation is maintained by an internal pumping ring. The reservoir is usually continuously vented to a vapor recovery system. 53 Pressurized external barrier fluid reservoir supplying clean fluid to the seal chamber. Circulation is by an internal pumping ring. Reservoir presuere is greater than the process pressure being sealed. 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 the process pressure being sealed. 61 Tapped Connections for the Purchaser's Use. 62 External source providing a quench.

API 610 8th API CODE

Reference

Quenching flow rate(set us standard)

Quenching fluid Flow rate Water 12/min Steam 0.5kg/Hr N2Gas 0.3kg/Hr

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