Basic Consideration
for Vessel Sizing, gas velocity constant K, varies from 0.06
to 0.5 with the vessel type and whether or not mist eliminators are used –
(GPSA data book)
Applicable settling law used: intermediate
law
|
Parameters
|
Feed Gas Suction Scrubbers
|
Feed Gas Discharge Scrubbers
|
|
Gas Flow MMscfd / scrubber
|
125
|
125
|
|
Liquid Flow, BPD
|
10
|
10
|
|
Liquid Density, lbs/ft3 *)
|
62.1
|
34.8
|
|
Pressure (opr), psia
|
435
|
785
|
|
Temperature (opr), °F
|
95
|
120
|
|
Gas Density, lbs/ft3
|
1.596
|
2.833
|
|
Compressibility Factor
|
0.916
|
0.880
|
*) estimated
Sizing is based on removing > 150 micron
droplets
Slug volumes have not been considered
L/D ratio 2 – 4 for vessels
Assumed liquid flow in the feed gas
separator for CV sizing is 10 bpd; actually no liquid flow is present in the
streams
Mist extractors have been assumed
EQUATIONS
Sounder – Brown Relationship
Separation coefficient in this case is for
a vertical separator.
The actual gas volume qacc can be calculated from the standard conditions using
the parameters given.
RESULTS
Based on the calculated diameters, the
vessels have been sized as follows:
Feed Gas Suction Scrubber 6’ – 6” diameter x 12 feet long T/T vertical
(2000mm x 3660mm)
Feed Gas Discharge Scrubber 6’ – 6” diameter x 12 feet long T/T vertical
(2000mm x 3660mm)
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