Plan 13 Flush for Solids removal
Plan 13 Flush for Solids removal
(OP)
I wanted to know if any here has put a plan 13 flush on a regular centrifugal pump (Goulds 3196 stx) to make sure solids did not pass into the pump seal. It seems like the centrifugal force will force solids to the outer casing wall and leave clean fluid in the center for the seal to clean itself with.
I've seen problems with plan 11's getting junked up with solids in the product and making the flush useless.
I've seen problems with plan 11's getting junked up with solids in the product and making the flush useless.
-Mike





RE: Plan 13 Flush for Solids removal
If you are currently using Plan 11 and this is getting blocked then you need to consider the following:
1 Do you have an orificae in the Plan 11? Is it getting blocked?
2 If there is no orifice what is the tubing diameter and is it getting blocked?
3 Does the product solidify when pump stops and this is why Plan 11 blocks?
Perhaps if you shed some more light on the application you may get a more specific response to help you.
PS: When using a cyclone separator ensure the solids SG is heavier than the product to be effective.
RE: Plan 13 Flush for Solids removal
Pchamber = Psuction + .25(Pdischarge-Psuction)
Now I realize that this is only an approximation, but...
I would have a 9 psid from the seal to the suction line.
I am aware of the plan 31, but don't really want to install it on this application.
The solids are mostly from hard chunks of solidified caustic and assorted salts that come in slugs from process upsets, so it's not under normal operating conditions.
I just wanted to know if anyone had any success with doing this on centrifugal pumps. I am aware that they are mostly used in vertical pumps, and haven't seen them on any regular 3196's ever. That's what turned the red light on.
-Mike
RE: Plan 13 Flush for Solids removal
I believe this is a very credible source, but I wanted as many inputs as possible.
-Mike
RE: Plan 13 Flush for Solids removal
I think that if Plan 11 is blocking then plan 13 will too.
RE: Plan 13 Flush for Solids removal
I stated that I have used this alternative. But, I was not able to perform a valid comparison to determine the amount of solids introduces with Plan 13 as compared to Plan 11. I chose this alternative based on the engineering principals involved. If the solids contained in your stream are heavier than the fluid and if the fluid is drawn down the back-side of the impeller against the centrifugal affect of the impeller it seems likely that some of the solids would be spun out and the remaining fluid would have a lower solids content than it would if it came off the outside of the volute at discharge pressure.
Depending on the exact nature of your stream, flexibox may very well be correct. You may plug up a plan 13 anyway. But, I have used this alternative and feel it has been successful in some services. I feel it is appropriate for you to use it.
Johnny Pellin