SELECT PLAN
Drawing A
Drawing B
| 1 | - Buffer gas panel (feeding block) |
| 2 | - Vendor |
| 3 | - Purchaser |
| 4 | - If required |
| V | - vent (if required) |
| FI | - flow indicator |
| FIL | - coalescing filter used in barrier gas feeding |
| FSH | - high flow switch |
| GBI | - buffer gas inlet (plugged) |
| GBO | - barrier gas outlet (normally closed) used only to depressurize the stuffing box |
| PI | - pressure indicator |
| PCV | - pressure control valve, sets the pressure above the process pressure of the inner seal |
| PSL | - low pressure switch |
Barrier gas installation. Externally supplied barrier gas is used to positively prevent process fluid from leaking into the atmosphere. Pressure of the barrier gas is higher than the medium pressure on the technological process side of the inner seal. Venting of the gland box may be required prior to start-up and operation, to avoid the collection of gas in the pump.
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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