compressor cylinder components part b

Question 1

What happens to compressor rod loading when suction pressure decreases?

Answer 1

Increases

Lowering suction pressure causes an increase in compressor rod loading.

Question 2

How should clearance between the piston and the cylinder head be set?

Answer 2

⅔ on the head end and ⅓ on the crank end

This ensures proper alignment and function.

Question 3

What is the consequence of a scratched or damaged piston rod surface?

Answer 3

Ruins the seal through the packing seal or wiper grease

A damaged surface can lead to leaks and loss of efficiency.

Question 4

What is the purpose of properly setting the piston to head clearances?

Answer 4

Prevents piston from hitting the head during operation

Proper clearance is crucial for avoiding mechanical failure.

Question 5

True or False: Inlet cooling water temperature should be slightly warmer than the inlet gas temperature.

Answer 5

True

This helps maintain efficiency and prevents condensation.

Question 6

True or False: The test pressure used when hydro-testing a cylinder after an overhaul is 1½ times the normal operating pressure.

Answer 6

True

This ensures the integrity of the cylinder under pressure.

Question 7

Name two types of cylinder liners.

Answer 7

1. Dry
2. Wet

Additional context regarding cylinder liner types may be required.

Question 8

Inspect (measure) cylinders to see if they are
Straight
Round
Within specified dimensions
All of the above

Answer 8

All of the above: straight, round, within specified dimensions

Regular inspection ensures proper function and longevity.

Question 9

A honed surface on a cylinder promotes what two things?

Answer 9

1. Sealing
2. Lubrication

A honed surface is crucial for effective sealing and lubrication.

Question 10

True or False: The top of the cylinder is the best location for the cooling water inlet to keep the cylinder full of coolant.

Answer 10

False

The inlet should be at the bottom to prevent trapping air.

Question 11

Clearance pockets are used primarily to control pressure. True or False?

Answer 11

False

Clearance pockets help manage pressure within a system.

Question 12

List the four (4) different ways that a compressor packing must be able to move in order to work effectively.

Answer 12

• Rotate
• Laterally
• Expand
• Contract

These movements allow the compressor packing to function properly and maintain efficiency.

Question 13

The markings on the oil wiper rings must face the cylinder side for proper installation. True or False?

Answer 13

False

The markings must face the crank end for correct installation.

Question 14

Clearance pockets are used primarily to control pressure. True or False?

Answer 14

True

Clearance pockets help manage pressure within a system.

Question 15

List the four (4) different ways that a compressor packing must be able to move in order to work effectively.

Answer 15

• Rotate
• Laterally
• Expand
• Contract

These movements allow the compressor packing to function properly and maintain efficiency.

Question 16

The markings on the oil wiper rings must face the cylinder side for proper installation. True or False?

Answer 16

False

The markings must face the crank end for correct installation.

Question 17

if the liner is hooter than normal what does this indicate

Answer 17

packing is leaking excessively

Question 18

true or false the radial cut ring must be installed on the pressure side

Answer 18

true

Question 19

how often should you check rod run out

Answer 19

yearly for misalignment due to settles foundations

Question 20

true or false
rod run out is normally checked with the unit cold in both the vertical and horizontal planes

Answer 20

true

Question 21

what is a major cause of horizontal run out

Answer 21

pipe stain

Question 22

what pattern should be used deglazing

Answer 22

cross hatch pattern 40-60 deg

Question 23

What must be checked before starting a new compressor or after replacement of certain parts?

Answer 23

Piston rod runout

This includes parts such as the cylinder, piston, piston rod, or crosshead.

Question 24

Why is it important to keep rod runout within limits?

Answer 24

To keep the rod running true through the piston rod packing

This ensures the longest possible packing life with minimal leakage.

Question 25

What influences vertical rod runout?

Answer 25

Piston to cylinder bore clearances and crosshead to crosshead guide clearances ## Footnote These factors are crucial for maintaining alignment.

Question 26

What happens to the cylinder and piston during operation?

Answer 26

They grow through thermal expansion ## Footnote This affects the alignment of the piston and crosshead.

Question 27

How is the piston centerline set during cold rod runout setting?

Answer 27

Lower than the crosshead centerline ## Footnote This adjustment helps align them at operating temperatures.

Question 28

Which type of pistons grow more during thermal expansion?

Answer 28

Larger diameter aluminum pistons ## Footnote They expand more than steel or cast iron pistons.

Question 29

what is done to make the cylinder straight and round

Answer 29

ridgid honing

Question 29

what industrial comprssors with non removable cast in block cylinders must be re bored and honed to the next oversize and have oversized pistons installed true or false

Answer 29

true

Question 29

true or false lubrication holes are usually drilled in place if needed and cylinder honing to take away humps and properly size the liner bore

Answer 29

true

Question 30

when should the compressor be shut down immediately

Answer 30

high temps stange sounds pressure falling or rising out of the norm

Question 31

what tool is used for measuring multiples cylinders but must be zeroed to known dimension using a outside micrometer

Answer 31

dial bore gauge

Question 32

what causes liner cracking

Answer 32

hot spots

Question 33

what causes discolouration

Answer 33

over heating

Question 34

what causes premature or excessive liner wear

Answer 34

dust or contamination coming through air filter or leaks in intake duct system

Question 35

when capacity must be changed by varying amounts on a reg basis what is the best choice

Answer 35

vvcp variable volume clearance pocket