Seals for Caustic application
Seals for Caustic application
(OP)
For 5% and 10% Caustic @ 40 Deg C application which is the best (Optimum) flushing plan ?
We can not use plan 32. Plan 11/62 are in use but still problem of crystalisation and seal failure exist.
We can not use plan 32. Plan 11/62 are in use but still problem of crystalisation and seal failure exist.





RE: Seals for Caustic application
RE: Seals for Caustic application
Thanks for valuable input. Have you installe these seals ? Share your experience.
RE: Seals for Caustic application
We have several in use at the refinery that I service and they are performing quite well. These are much nicer than a single seal with steam or water quench because the upstream operates like tandem or dual seal and eliminates the housekeeeping issues of a quench. No more questions from operators about the fluid comming out of the seal.
Be sure to mount the reservoir properly, as the tubing to and from the Tee or cross in the flush plan is what acts like a heat exchanger for the buffer fluid. In some applications finned tubing and insulation on the return leg might be a good idea. The reservoir should be high enough to offer enough resonance time and head (a little back pressure) for the system.
Look for an article in an upcoming issue Pumps and Systems about upstream pumping seals.
RE: Seals for Caustic application
RE: Seals for Caustic application
You say Plan 11/62 is still giving you crystallisation
Has the flow rate into the box of the P11 been confirmed as being sufficient to prevent crystalisation/sedimentation?
HTH
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Milkboy
RE: Seals for Caustic application