Page 313 - Compression Machinery for Oil and Gas

298 SECTION II Types of Equipment

Flaregas of molecular weight Variable Speed motor, 50–100% Demin water Tandem 5.1–23.7 1.05/2.8

16 Large range DGS

Flaregas of molecular weight speed motor Demin buffered carbon seal 10.9–40.4 0.91/2.9

15 Large range Fixed water N 2 ring

6.40 turbine water

Fig. Acethylene flow driver buffered restrictive type 1.1/4.4
Injection 14 See High and power Steam Demin Water ring 13.5

Liquid driver low DGS

Without 13 Hydrogen recovery High power, molecular weight Steam turbine – Double 8–12 1.2/3.5

or
With 12 Offshore vapor recovery Offshore high VRU, discharge pressure speed Fixed motor Tandem DGS 36–45 7.2/21.5

Compressors vapor VRU stages –

Screw Offshore recovery Offshore side with stream between speed Fixed motor Oil-cooled mechanical seal 47.5/38.5 2.0/7.0

Dry 11 –

Stage speed

2 Butadiene molecular Oil-cooled mechanical
of 10 High weight Fixed motor – seal 54.2 1.05/2.6
Examples

6.8 feature injection type seal weight (kg/kmol) pressure
TABLE Nos. Process Special Driver Liquid Shaft Molecular Suction abs) (bar