1 Introduction
MANUAL TME400-VCF · EN08 · July, 01
st
2021
1.4.2.10.
Pressure loss
The measuring points for determining pressure loss are 1 x DN upstream and down-
stream of the meter. The pressure loss is calculated according to the following for-
mula:
where: p pressure loss [mbar]
Zp coefficient of pressure loss [-]
operating density [kg/m³]
Qm volume flow at measurement conditions [m³/h]
DN nominal meter diameter [mm]
Perforated plate straightener L1 according to ISO/DIN
Perforate plate straightener L2 according to ISO/DIN
Perforated plate straightener L3 according to ISO/DIN
Perforated plate straightener LP-35 RMG standard
Bend straightener RB 19 according to ISO/DIN
The values for Z
p
are rough averages. The exact value is calculated from the pres-
sure loss, which is determined when testing the meter.