SELECT PLAN
Drawing A
Drawing B
| V | - vent |
| F | - flushing |
| LBI | - buffer liquid inlet |
| LBO | - buffer liquid outlet |
| LSH | - high level switch |
| LSL | - low level switch |
| LI | - level indicator |
| FI | - flow indicator |
| PS | - pressure switch |
| PI | - pressure indicator |
| 1 | - Purchaser |
| 2 | - Vendor |
| 3 | - To collection system |
| 4 | - Normally open |
| 5 | - If required |
| 6 | - Tank |
| 7 | - Buffer fluid refill |
Application of external unpressurized tank for feeding buffer liquid to external unpressurized double sealing system. During normal operation the circulation is forced and maintained with an internal pumping ring. The tank is normally vented continuously to the gas recovery system and the pressure in it is lower than the pressure in the gland box.
LEGEND - CIRCULATING SYSTEMS acc. to API 682 (610)
Standard flushing and auxiliary equipment systems presented above are the systems most often used in industry. The equipment presented here is the necessary minimum option and, after agreements made with the user, the systems below can be extended increasing their functionality.
Drawing on the left (A) shows diagrammatic arrangement of conduits and instrumentation, while the drawing on the right (B) shows the most important details of the stuffing box (the seal chamber).
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