Double Seal Piping Plan Query
Double Seal Piping Plan Query
(OP)
Hey there
Double (Dual) Pressurised Mechanical Seal which the Barrier Fluid is supplied by another Centrifugal Pump which goes to Barrier In connection.
Barrier Out connection has a needle valve and a gauge to throttle the pressure to get a Barrier of 2 Bar above box.
The barrier fluid then goes to drain (water).
This is not an API Plan.
What are the groups thoughts on this set up as I have seen it a few times and cannot understand why people use it.
TIA
-
Milkboy





RE: Double Seal Piping Plan Query
RE: Double Seal Piping Plan Query
You could recirculate the fluid back to the tank the supply pump is pumping from, however you will need to check the heat load on the seal and that the fluid wont boil due to being constantly recirculated.
Other dangers of this are debris being carried from the process and into the barrier fluid system
RE: Double Seal Piping Plan Query
(a) as described by JJPellin to prevent abrasives to come between the seal faces;
(b) to cool/lubricate the seal faces; and
(c) to prevent air ingress in seal cavity with negative pressure.