Description
Product recirculation from seal chamber to pump suction via a flow control orifice.
Features
- Provides continuous vent for vertical pumps.
Use
- Wherever Plan 11 is not usable due to low-pressure margin between discharge and seal chamber pressure.
- Used in vertical pumps provided differential pressure is sufficient to provide.
Caution
- Check margin between seal chamber pressure and suction pressure.
- Orifice size should be at least 1/8” (3.2mm).
- With purchaser approval, the flow control orifice may be omitted if it is not needed to achieve the required flush flow rate.
- A distributed flush injection is not recommended with a piping plan 13.
