18
velocity readings (as indicated by the meter) by the
following density correction factor:
Act Vel
Std Vel
.
.
.
.
T
P
=
+
+
460
460 70
14 7
.
Where
T = Ambient temperature in °F
P = Ambient pressure in psia
If you use metric units, the equation becomes:
Act Vel
Std Vel
.
.
.
.
T
P
m
m
=
+
+
273
273 211
1014
.
.
Where
T
m
= Ambient temperature in °C
P
m
= Ambient pressure in kPa
