PRINTED ON RECYCLED PAPER
M1 rev G 0101
where
(
)
(
)
(
)
(
)
K
Pa
Pc
Tc
Ta
=
+
+
æ
è
ç
ö
ø
÷
+
+
æ
è
ç
ö
ø
÷
14 7
14 7
460
460
.
.
Pa = Actual gas pressure at entrance to meter, psig.
Pc = Calibrated gas pressure marked on the meter dial, psig.
Ta = Actual gas temperature at meter, °F
Tc = Calibrated gas temperature marked on meter dial, °F
Example:
Meter calibrated for compressed air at 100 °F and 80 psig. reads 100 SCFM at an
actual temperature of 70 °F and pressure of 85 psig. What is the actual flow rate?
(
)
(
)
(
)
(
)
K
=
+
+
æ
è
ç
ö
ø
÷
+
+
æ
è
ç
ö
ø
÷
85 14 7
80 14 7
100
460
70
460
.
.
Therefore, actual flow rate = 1.05 x 100 = 105 SCFM
6.
Correction
Factors
(Continued)
INDICATOR
ASSEMBLY
GEAR
MOVEMENT
HOUSING
PULSATION
SNUBBERS
METER BODY
FLOW
6.2
Compressed Gas Service
If the gas pressure or temperature varies from the values marked on the meter dial, then a
correction factor, K, must be applied to the meter reading to obtain the actual flow rate.
( )( )
K
=
=
105 106
105
.
.
.
Cutaway View From Front
Dial Removed
Figure 9
7.
Cutaway
View
