Approximate Capacity Correction For Altitude - Quincy Compressor QR-25 Series Instruction Manual

SECTION 7 SECTION 7
SECTION 7 SECTION 7 SECTION 7

Approximate Capacity Correction for Altitude

Altitude
(ft.)
Sea Level
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
11000
12000
14000
15000
QR-25 Series
52201-105, May 2003
25 PSIG 40 PSIG
1.00 1.00
0.996 0.993
0.992 0.987
0.987 0.981
0.982 0.974
0.977 0.967
0.972 0.961
0.967 0.953
0.962 0.945
0.957 0.938
0.951 0.931
0.945 0.923
0.938 0.914
0.927 0.897
0.918 0.887
Notes:
1.) Correction factors are approximate and shown for single stage com-
pressors.
2.) For two stage compressors use the interstage pressure to find the
correction factor.
3.) This chart does not allow for air tools which require more free air at
altitiudes above sea level.
4.) To find the capacity of a compressor at a given altitude, multiply the
rated capacity of the compressor by the factor corresponding to the
altitude and discharge pressure. The result will be the actual capacity
(CFM) of the compressor at the given altitude.
REFERENCE INFORMA REFERENCE INFORMA
REFERENCE INFORMA REFERENCE INFORMA REFERENCE INFORMATION
Correction Factors
60 PSIG 80 PSIG
1.00 1.00
0.992 0.992
0.984 0.977
0.974 0.967
0.963 0.953
0.953 0.940
0.945 0.928
0.936 0.915
0.925 0.900
0.915 0.887
0.902 0.872
0.891 0.858
0.878 0.839
0.852 0.805
0.836 0.784
32
90 PSIG 100 PSIG 125 PSIG
1.00 1.00
0.998 0.987
0.972 0.969
0.959 0.954
0.944 0.940
0.931 0.925
0.917 0.908
0.902 0.890
0.886 0.873
0.868 0.857
0.853 0.840
0.837
0.818
Quincy Compressor
3501 Wismann Lane, Quincy IL - 62305-3116
TION TION
TION TION
1.00
0.982
0.962
0.942
0.923