Abu Dhabi Gas Liquefaction Company Ltd Job Training Mechanical Technician Course Module 9 Compressors

HP Stage-2 cylinder 
4.1.5 ADGAS Reciprocating Compressors 
Most of the reciprocating compressors on the ADGAS plant are double-acting, multi-
stage units.
Instrument and service air for the Sulphur STOREX area is supplied by two 
compressors.
These compressors are: 
• balanced-opposed
• two-stage 
• two-cylinder (two casings) 
• double-acting 
The two cylinders are connected in series as shown in Figure 4.14. 
Figure 4.14: Cylinder Configuration of Sulphur STOREX Air Compressors 

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Personnel & Training Division
Job Training—Mechanical Technician 
Compressors/Rev. 0.0 
Page 25 of 90
In Figure 4.15 you can see one of these compressors at the front of the picture. The 
other identical compressor is at the back of the picture. These compressors are driven 
by electric motors. 
 
Compressor A 
second stage 
end 
Compressor B 
second stage end 
Stage-2 
discharge 
Stage-2 
suction 
Compressor A 
first stage end 
Figure 4.15: Sulphur STOREX Instrument Air Compressors (Tag# 28-K-701 A and B) 

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Personnel & Training Division
Job Training—Mechanical Technician 
Compressors/Rev. 0.0 
Page 26 of 90
Emergency instrument air for all other plant is supplied by a two-cylinder, two-
stage V-type compressor. This compressor is part of the Utilities Air Plant and is 
driven by a steam turbine. Figure 4.16 shows two views of this compressor. 
There are other small V-type compressors in the Nitrogen and Firewater Plants.
Figure 4.17: Shows the compressor used for diesel engine start-up in the Firewater 
Plant.