25362 Chemical,
I am not sure I understand your post. I am surprised that any pump would be designed without consideration of NPSH. Are you sure that the NPSH consideration is not imbedded in the standard design calculations of the very specific situation you describe? The part in your post...
Are you really talking about sulfur burning, or H2S? Most of my work has been to get H2S converted to sulfur, and we really do not want to burn it back to SO2 once we get it there. What is your industry, are you trying to make Acid?
The last time I talked with TPA was several years ago...
Thanks for the comments.
It seems that there is significant experience that 2 meters NPSHA should be no problem. I accept that information and will specify the pumps that way. I appreciate all of you pointing out that the seals will be a problem. I believe we can install external flushed...
Thanks for the input.
Montemayor,
I intended to say that the pressure on the disulfide oil is equal to the vapor pressure, therefore there is only the static head of two meters to provide NPSH.
25362,
The liquids should not segregate, as they have nearly identical specific gravities, both...
I am trying to specify a pump that will handle 5% caustic solution with small amounts of disulfide oil present. The water based caustic phase is pressurized well above it's vapor pressure, and thus has around 30 meters of NPSHA. The disulfide phase is at it's vapor pressure and thus has around...
