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.