Reciprocating Compressor Crosshead and Distance Piece / Crankshaft and Frame Components

Question 1

What compressor component is used where complete sealing of explosive gases is necessary?

Answer 1

Multi-compartment distance piece

Question 2

When inspecting a crosshead for wear, a feeler gauge fits under one corner on the bottom, name 3 possible causes?

Answer 2

Bent Piston Rod.

worn piston rings and or rider bands.

Damaged balance nut.

Question 3

What is a common way to balance the mass of opposing compressor throws with pistons of different diameters?

Answer 3

Using balance nuts to lock piston rod to crosshead.

Question 4

What is the minimum number of steps that should be used when torqueing rod or main bearing caps?

Answer 4

3

Question 5

What is the first step in a detailed main frame inspection?

Answer 5

Visual

Question 6

What type of compressor uses a articulating connecting rod?

Answer 6

Integral

Question 7

What are two ways that vibrations due to reciprocating masses are minimized?

Answer 7

Opposed Throws
Counterweights

Question 8

True or False;
An opposed-throw compressor is typically more balanced than a single throw.

Answer 8

True

Question 9

Select two possible causes of crankshaft web deflection;

Answer 9

Compressor Frame Soft Foot
Twisted main frame

Question 10

True or False;
Anti-rotation tabs locate and prevent the shell from rotating in the housing.

Answer 10

True

Question 11

True or False;
A bump check is considered a accurate bearing clearance check.

Answer 11

False

Question 12

What is a result of main bearing wear?

Answer 12

Reduced oil pressure.

Question 13

What is the purpose of bearing spread?

Answer 13

Holds shell in place during installation

Question 14

What is the purpose of bearing crush?

Answer 14

Ensures good heat transfer

Question 15

What is a common practice after any machining on a compressor frame?

Answer 15

Cleaning out oil galleries with wire, then blowing out with compressed air