compressor cylinder components a/b Flashcards
Rod reversal to the movement of the crosshead pin under alternating forces of compression and tension.
a) true
b) false
True
Piston speed is constant while travelling from BDC and TDC.
a) true
b) false
False: It depends on the angle of crank throw
Piston ring end gap is checked with the rings installed on the piston.
a) true
b) false
False: Piston ring end gap is checked with the rings installed in the cylinder without piston.
On a large, two-stage, double-acting compressor, it is most likely that the first-stage piston is made of aluminum while the second-stage piston is made of cast iron to help to balance the reciprocating weight.
a) true
b) false
True
Decreasing suction pressure results in __ compressor rod loading.
a) increasing
b) lowering
Increasing
The proper way to set clearance between the piston and the cylinder head is to have 2/3 on the head end and 1/3 of the total clearance left on the crank end.
a) true
b) false
True
What happens if the surface on the piston rod is scratched or damaged?
It could ruin the seal through the packing seal area or oil wiper area.
What is the purpose of properly setting the piston to head clearances?
It prevents the piston from hitting the head during operation.
Inlet cooling water temperature should be slightly warmer than the inlet gas temperature.
a) true
b) false
True
When a cylinder is hydro-tested after an overhaul, the test pressure used is 1 1/2 times normal operating pressure.
a) true
b) false
True
Name two (2) types of cylinders liners.
a) ____
b) ____
a) dry
b) wet
We inspect (measure) cylinders to see if they are:
a) straight
b) round
c) within specified dimensions
d) all of above
d) all of above
A honed surface on a cylinder surface promotes what two (2) things?
a) ______
b) ______
a) cylinder and ring lubrication
b) ring sealing and break-in
The top of the cylinder is the best location for the cooling water inlet to keep the cylinder full of coolant.
a) true
b) false
False: The bottom is the best location for the cooling water inlet to prevent trapping air
Clearance pockets are used primarily to control pressure.
a) true
b) false
False: Clearance pockets control output
List the four (4) different ways that a compressor packing must be able to move in order to work effectively.
a) ____
b) ____
c) ____
d) ____
a) axially
b) rotate
c) laterally
d) expand/contract
The markings on the oil wiper rings must face the cylinder side for proper installation.
a) true
b) false
False: The markings on the oil wiper rings must face the crank end
What are balanced nuts used for?
Used to fin tune the weight balancing oppossing multi stage reciprocating compressors parts
What is the rule of thumb for setting piston clarance when there is no manufacturers specificatione?
1/3 piston to crank end and 2/3 piston to head
What ring do you use when piston rides over valve ports?
Uncut rider band
What are 3 types of piston rings?
Butt joint, angle joint, step joint,
Butt joint is the most common used on compressor and oil control rings.
Step joint reduce leakage when a more sufficient seal is needed.
What temp do you want the cooling water come in at and where does it enter at and leave at?
5 to 10°C higher Then the incoming gas. Water should enter from the bottom of the cylinder and exit at the top to ensure the water jacket is full of cooling water with out any air pockets.
Using water that is too cold for compressor cooling can result in what?
Using water that is too cold for compressor cooling can result in condensation inside the cylinder which washes out lubrication and accelerates wear
What are clearances pockets?
Used to control the output of a compressor while keeping up with the pressure they can be either fixed or variable control clearance pockets
What. Does VVCP mean?
Variable volume clearance pocket
When should you adjust a VVCP ?
When the machine is not running
