Orifice position in plan 22

Question

Orifice position in plan 22

Sunay1234 (Mechanical)

(OP)

13 Jun 18 13:41

We have a pump in which plan 52 + plan 22 is double seal combination is used.
In plan 22, will any of the following orifice position/s cause malfunctioning?
1. Between discharge and seal flush cooler
2. Between cooler and seal flush inlet
3. Two orifices in above-mentioned positions.

Aub_Engineer (Mechanical) · Answer 1 · 2018-06-28 14:43:36

Most diagrams show the orifice between the discharge and seal flush cooler. I would consider moving it to position #2 if the pumped fluid is near its vapor pressure. This may help prevent flashing across the orifice.

With that said, most literature will discourage the use of plans 21/22 in favor of the plan 23.

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Orifice position in plan 22