Flush plan for heavy oil pump
Flush plan for heavy oil pump
(OP)
We use flush plan 54 for our heavy oil(Atmospheric Residue)
pump in the refinery.
The operating temperature is 340C.
We use dual mechanical seal in this service.
We encounter seal leakage problem very often.
Is there any better flush plan in this service?
pump in the refinery.
The operating temperature is 340C.
We use dual mechanical seal in this service.
We encounter seal leakage problem very often.
Is there any better flush plan in this service?





RE: Flush plan for heavy oil pump
Seals on Atm: Bottoms are usually under low pressure unless you have a pump that allows discharge pressure in the seal chamber (and these are thankfully not so common) so a single metal bellows seal with Tungsten face and SiC seat with a plan 02/62 flush plan works well. The important things to remember are to warm up thoroughly before start up and use a constant dry steam quench to the atmospheric side of the seal. Lifetimes of 7 years plus have been recorded using this arrangement.
RE: Flush plan for heavy oil pump
RE: Flush plan for heavy oil pump
RE: Flush plan for heavy oil pump
A more positive device is a dry running high temperature metal bellows seal which is used in place of the floating bush. As it's name suggests it will run without lubrication other than the low pressure steam quench. One caveat is that the steam pressure must be controlled to a maximm of 3 psi and the drain must be as open as possible. NTH is right though, you should run the single seal option past your safety people especially if the service is above auto-ignition temp. If in doubt have a look at the reccomendations of API682.