Reciprocating Compressor Cylinder Components A+B Assignment Flashcards
True or False;
A single acting compresses on one side of the piston only
True
A piston rod is not running true through the packing. What is this called?
Rod Run Out
True or False;
Uncut rider rings should be used when they pass over a valve port.
True
What is the purpose of measuring or trammeling the position of the piston rod relative to the crosshead?
To facilitate quick assembly
What is a ‘rule of thumb’ for setting piston to cylinder head clearance if you do not have manufacturer specifications available?
1/3 crank end 2/3 head end
True or False;
Rod reversal is necessary to allow oil to flood around the crosshead pin.
True
What type of cooling is most common on large compressors?
Liquid Cooling
True or False;
It is important to keep the cooling water temperature above the incoming gas temperature to prevent condensation in the cylinders
True;
+5.5C (10F) above inlet gas temperatures
What are three types of cylinders used in reciprocating compressors?
Cast Integral
Wet Liner
Dry Liner
Which ring material is commonly used in oil free compressors?
Teflon
Which end of the cylinder are clearance pockets installed on?
Head End
What pressure is used for cylinder hydrostatic testing?
1.5 times the maximum working pressure
Improper preload of the cylinder will not effect rod run out.
False;
Preload is to ensure that rod runout is within manufacturers spec, when the compressor frame and cylinders are at operating temp since thermal growth affects alignment
2 reasons for keeping rod runout to to a minimum:
Minimize Wear
Minimize Leakage
Three causes of rod runout:
- Balance nut not square to crosshead
- Worn crosshead or guides
- Worn rider bands
Pressure breaker rings are radially cut.
True
Dots and / or letters on the packing rings should face the crankshaft.
False;
Face towards cylinder(pressure side)
What is used on pairs of single-acting packing rings to ensure that the gaps don’t align?
Dowels
Liquid-cooled packing cases are normally used in non-lubricated packing applications.
True;
Used to prevent shortened ring life caused by excessive heat in the packing case.
Why does the cooling water enter the bottom of the flange and leave out of the top in liquid-cooled packing cases?
To prevent trapped air
To prevent air from entering the cylinder, double-acting packing ring sets are used.
True
2 reasons that cooling water enters the bottom of the cylinder near the discharge valves and then exits out the top near the suction valves?
- Prevent cooling system from hydro locking
2.Creates more even temperature across Cylinder
