1. Why anti surge control is not required in reciprocating compressors?
In Reciprocating Compressors Non return valves (NRVs) are present in the Suction Line and Discharge line, which prevents flow reversal. In case of high discharge pressure the pressurized gas gets accumulated in the cylinder and cannot go back through the NRV of suction line. So anti surge system is not required.
2. What do you understand by Surge Limit Line and Control line?
For any particular operating curve the point of minimum flow and max pressure is known as Surge limit point and the locus of all such points defines a curve called as Surge Limit line.
The Surge control line is the locus of set points of minimum flow and max pressure at operating conditions. The manufacturer normally gives these.
3. Why Cooling water is used for Lube Oil System?
The Lube Oil System is used for Lubrication of the bearings. The outlet of the system i.e the high temperature lube oil is cooled by means of cooling water. This is because if high temperature lube oil is sent back to compressor then the compressor may get damaged if the internals in the compressor are not suitable for high temperatures.
4. What are Recycle and Vent valves and where are they used?
The Recycle valves are used in case of hazardous gases while Vent valves are
Used in case of non-hazardous gases. Recycle valves are used for
both types of gases for reducing the cost of the gas or fuel vent valves thereby
the operating cost and also to recover the gas otherwise vented to flare. Actually
Vent or Blow Off valves should be used in the first place so as to prevent fast
5. What are the systems associated normally with the compressor?
Vibration monitoring, DCS, Lube Oil system
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