Vane Pack "k" Factor
Vane Pack "k" Factor
(OP)
Can anyone advise on allowable "k" factors for vane pack separation? This is a Peerless PBX type unit operating at about 885 Psia on sweet (0.65 gravity) gas.
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
|
RE: Vane Pack "k" Factor
These were also a lower pressure than you are working with, I don't know if there is a derate factor associated with them similar to demister pads but I wouldn't be surprised.
RE: Vane Pack "k" Factor
In general, gas load factors (or K-values) used for sizing vane packs are in the range of 1.00-1.25 m/sec for atmospheric pressure conditions. Similarly to demister pads, pressure de-rating factor is applied to predict performance at elevated pressures.
I wouldn't recommend using vane packs in systems above 10-15bar since their performance deteriorates exponentially above these pressures - especially if high liquid removal efficiency is required (e.g upstream of mol sieve dehydrators or compressors). A usual way to go is to employ:
1. Vessel large enough (no one can beat the gravity)
2. Mistmat as primary coalescing element, 100-150mm thickness, stainless steel
3. Cyclonic devices as secondary coalescers
We've had quite bad experience with vane packs in our Mol Sieve unit (KO drum) which operates at 70barg pressure. This system simply doesn't work and I would never believe to separator internals vendors, regardless of what they say.
RE: Vane Pack "k" Factor
I apologize,
Gas load factors mentioned in my post should be:
0.100 - 0.125 m/sec