Kobold DOG Series, Operating Instructions Manual

Page: 35 / 58

DOG
DOG K11/0422 page 35
16. Pressure Loss/Flow
The diagram applies for gases with a density of air at NPT (0 °C and 1013.25 mbar).
The pressure loss is always proportional to the density of the gas. For example, at
100% higher density there is double pressure loss.
Calculating the Actual Density
The actual density can be calculated with the following formula:
D0 = density at 1 bar abs. and 0 °C (= 273 K) T = temperature in K
(= °C + 273 for example 20 °C = 273 + 20 = 293 K) T0 = 273 K
P = operating pressure in bar (absolute pressure)
Calculating the Norm Flow
QN = norm flow at 1.013 bar abs. and 0 °C
Q = operating flow
P = operating pressure in bar (absolute pressure)
T = operating temperature in K
Pressure drop [mbar]