Abu Dhabi Gas Liquefaction Company Ltd Job Training Mechanical Technician Course Module 9 Compressors
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- 4.1.2 Snubbers
- Figure 4.5
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Figure 4.3: Single-acting Reciprocating Compressor
Crankshaft Piston Connecting rod Crosshead Piston rod Packing gland Discharge valve Suction valve Crankcase Water jacket Distance piece Personnel & Training Division Job Training—Mechanical Technician Compressors/Rev. 0.0 Page 17 of 90 Figure 4.4 shows a similar compressor but this one is double-acting. The double-acting compressor discharges gas on every stroke: • As the piston moves away from the crankshaft (to the right in the figure) gas discharges from discharge valve A. • As the piston moves towards the crankshaft (to the left in the figure) gas discharges from discharge valve B. This still gives a pulsating flow but it is smoother than the discharge from a single- acting machine. 4.1.2 Snubbers To reduce pulsations and to provide a more continuous flow from the discharge, pulsation dampeners or snubbers are fitted in the discharge and suction lines. These are large drums that do the same job as the pulsation dampener and suction stabiliser used with reciprocating pumps. Figure 4.5 shows the suction and discharge snubbers on a large reciprocating compressor. Figure 4.4: Double-acting Reciprocating Compressor Suction valve B Discharge valve A Discharge valve B Discharge port Suction port Suction valve A Personnel & Training Division Job Training—Mechanical Technician Compressors/Rev. 0.0 Page 18 of 90 Where more than one cylinder is connected in parallel, the snubber can also act as a header as shown in Figure 4.5. Download 0.5 Mb. Do'stlaringiz bilan baham: 
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