Page 415 - Reciprocating Compressors Operation Maintenance

4OO Reciprocating Compressors: Operation and Maintenance

Machines may be sized on the basis of Table A-1. Different manufac-
turers may vary slightly from these sizes.

TABLE A-1
TYPICAL RECIPROCATING COMPRESSOR DESIGN DATA FOR
US-BUILT MACHINES

HP Per Maximum HP Rod Size Rod Load Speed
Stroke Stroke Per Machine (In.) (Pounds) (RPM)

9 250 500 2-% 20,000 600
12 300 1000 2-% 30,000 400
14 500 1500 3 45,000 327
16 750 3500 3-% 75,000 300
18 1000 6000 4 1000,000 277

Table A-2 shows the relative influence or importance of several of the
parameters discussed earlier.

TABLE A-2
How DIFFERENT DESIGN PARAMETERS RELATE TO
COMPRESSION RATIOS

What is Important?
Compression More Important
Ratio Factor
Very High (10-30) Clearance
High (8-10) Clearance principally,
valving somewhat
Moderate (5 Max.) Balanced, all equal
Low (2 or less) Valving

SAMPLE CALCULATION

A New Machine

Design data:
Process gas molecular weight 17.76
k-value 1,26