Mechanical Seal Barrier Fluid
Mechanical Seal Barrier Fluid
(OP)
We used to use Propanol as a barrier fluid for our Ethylene Transfer Pump which uses a double, back to back mechanical seal arrangement, and which pumps Ethylene at
-104Deg C (-155F).
But we can not use this Propanol any more as it will contaminate the process in case of seal failure.
Is there any other liquid which is having a freezing point lower than -104Deg C and which we can use as a barrier fluid for our pump.
Thanks,
-104Deg C (-155F).
But we can not use this Propanol any more as it will contaminate the process in case of seal failure.
Is there any other liquid which is having a freezing point lower than -104Deg C and which we can use as a barrier fluid for our pump.
Thanks,





RE: Mechanical Seal Barrier Fluid
RE: Mechanical Seal Barrier Fluid
RE: Mechanical Seal Barrier Fluid
Consult you pump vendor for the conversion.
Are you using Sundyne for this transfer pump?
RE: Mechanical Seal Barrier Fluid
RE: Mechanical Seal Barrier Fluid
NSS = SUCTION SPECIFIC SPEED
ITS DIMENSIONLESS
NSS = ( N * Q^0.5 ) / NPSHR ^0.75
N = RPM
Q = M3/MIN
NPSHR = m
RE: Mechanical Seal Barrier Fluid
Appreciate your feedback; I was wondering what me3 pump nss was :)
RE: Mechanical Seal Barrier Fluid
But, if I do not find one, I will go for modifying the seal system which will be a bit more complicated and costly.
In addition, I am already in contact with the vendor (which ic an Italian company), but t is taking a long time.
Thanks,
RE: Mechanical Seal Barrier Fluid
Using Nitrogen as a buffer fluid at a lower than process pressure with a contacting seal on the inboard side is also an option.
RE: Mechanical Seal Barrier Fluid
RE: Mechanical Seal Barrier Fluid
RE: Mechanical Seal Barrier Fluid
RE: Mechanical Seal Barrier Fluid
RE: Mechanical Seal Barrier Fluid
looks u r in olefins plant, we do have similar arrangment as the one you have. we are using plan 53B using exxon barrier fluid. i am off my office now but tomorow i will get u the spec..in addition, i have some alternativ chart which might help. do u have low level (pressure )alarm in acse of primary failure?
will come back 2 u
upm
RE: Mechanical Seal Barrier Fluid
Thanks for your help. We do have both low level and low pressure alarms in the system.
The problem is that the temp. is so low to have a suitable barrier flid with the right freezing point!
RE: Mechanical Seal Barrier Fluid
Buffer fluids for cryogenic seals that can beare single or multiple alcohols such as ethyl alcohol, ethylene glycol, glycerine or propyl alcohol, this last one may be used down to - 120 deg C.