Piping Interview Questions - Part 02

Question No. 26
What are the types of compressors?
Answer: Positive Displacement, Centrifugal and Axial, rotary screw, rotary vane, rotary lobe, dynamic, liquid ring compressors.

Question No. 27
What are types of compressor drives?
Answer: Electric motor, gas turbine, steam turbine and gas engine.

Question No. 28
How Centrifugal compressors work?
Answer: 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.

Question No. 29
What are types of steam turbine and why are they popular?
Answer: Condensing and non-condensing, Popular because can convert large amounts of heat energy into mechanical work very efficiently.

Question No. 30
Where gas turbine drive is used?
Answer: Desserts and offshore platforms where gas is available, for gas transmission, gas lift, liquid pumping, gas re-injection and process compressors.

Question No. 31
What are the auxiliary equipments of compressor?
Answer: Lube oil consoles, Seal oil consoles, Surface condensers, Condensate pump, Air blowers, Inlet air filters, waste heat system, compressor suction drum, knock out pot, Pulsation dampner, volume bottles, Inter and after coolers.

Question No. 32
What are the types of seal oil system?
Answer: Gravity and pressurized.

Question No. 33
What factors to be considered while designing compressor housing?
Answer: Operation, Maintenance, Climate conditions, Safety, Economics.

Question No. 34
What are the compressor housing design points?
Answer: Floor elevation, building width, building elevation, hook centerline elevation.

Question No. 35
What are the types of compressor cases?
Answer: Horizontal split case, Vertical split case.

Question No. 36
How to located temperature and pressure instruments?
Answer: Temperature in liquid space, at down-comer side and pressure in vapour space, in area except down-comer sector.

Question No. 37
What are necessary parts of inlet line of compressor?
Answer: 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 interstage line and in discharge line before block valve.

Question No. 38
What points to be considered for reciprocating compressor piping layout?
Answer: 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

Question No. 39
What are the types of compressor shelters?
Answer: On ground with no shelter, Open sided structure with a roof,
Curtain wall structure (Temperate climates), Open elevated installation, Elevated multi-compressor structure.

Question No. 40
What are drum internals?
Answer: Demister pads, Baffles, Vortex breakers, Distribution piping.

Question No. 41
What are drum elevation requirements?
Answer: NPSH, minimum clearance, common platforming, maintenance, operator access.

Question No. 42
What are drum supports?
Answer: Skirt for large drums, legs, lugs, saddles for horizontal drums.

Question No. 43
What are necessary nozzles for non-pressure vessel?
Answer: Inlet, outlet, vent, manhole, drain, overflow, agitator, temperature element, level instrument, and steam-out connection.

Question No. 44
What are necessary nozzles for pressure vessel?
Answer: Inlet, outlet, manhole, drain, pressure relief, agitator, level gauge, pressure gauge, temperature element, vent and for steam-out.

Question No. 45
What is preferred location for level instrument nozzles?
Answer: Away from the turbulence at the liquid outlet nozzle, although the vessel is provided with a vortex breaker, instrument should be set in the quiet zone of the vessel for example on the opposite side of the weir or baffle or near the vapor outlet end.

Question No. 46
What is preferred location for process nozzles on drum?
Answer: Minimum from the tangent line.

Question No. 47
What is preferred location for steam out nozzle on drum?
Answer: At the end opposite to the maintenance access.

Question No. 48
What is preferred location for vent?
Answer: AT the top section of drum at the end opposite the steam out connection.

Question No. 49
What is preferred location for pressure instrument nozzle on drum?
Answer: Must be anywhere in the vapor space, preferable at the top section of drum

Question No. 50
What is preferred location for temperature instrument?
Answer: Must be in liquid space, preferably on the bottom section of drum.
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