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Piping Design Engineer Interview Questions Part-5 (Compressors)

Piping Design Engineer Interview Questions

1.What are the types of compressors?
Positive displacement, centrifugal and axial, rotary screw, rotary vane, rotary lobe, dynamic, liquid ring compressors.
2.What are the types of compressor drives?
Electric motor, gas turbine, steam turbine and gas engine.
3.How centrifugal compressors work?
High speed impellers increase the kinetic energy of the gas, converting this energy into higher pressures in a divergent outlet passage called a diffuser. Large volume of gas at moderate pressure.
4.What are the types of steam turbine and why are they popular?
Condensing and non-condensing, popular because they can convert large amounts of heat energy into mechanical work very efficiently.
5.Where gas turbine drive is used?
Desserts and offshore platforms where gas is available, for gas transmission, gas lift, liquid pumping, gas re-injection and process compressors.
6.What are the auxiliary equipment of compressor?
Lube oil consoles, seal oil consoles, surface condensers, condensate pump, air blowers, Intel air filters, wast heat system, compressor suction drum, knock out pot, pulsation dampener, volume bottles, inter and after coolers.
7. What are the types of seal oil system?
Gravity and pressurized.

8. What factors to be considered while designing compressor housing?
Operation, maintenance, climate conditions, safety, economics.
9. What are the compressor housing design points?
Floor elevation, building width, building elevation, hook center line elevation
10. What are the types of compressor cases?
Horizontal split case, vertical split case.
11. What are compressor suction line requirements?
Minimum 3D straight pipe between elbow and inlet nozzle, increases based on inlet piping layout 4D
12. What are necessary parts of inlet line of compressor?
Block valve, strainer, break out flanges in both inlet and outlet to remove casing covers, straightening vane in inlet line if not enough straight piece in inlet line available, PSV in inter stage line and in discharge line before the block valve.
13. What points to be considered for reciprocating compressor piping layout?
High pulsation, simple line as low to grade as possible for supporting, analog study, all branches close to line support and on top, isolate line support from adjacent compressor or building foundations
14. What are the types of compressor shelters?
On ground with no shelter, open-sided structure with a roof, curtain wall structure (temperature climates), open elevated installation, elevated multi-compressor structure

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