Pressure Loss - Endress+Hauser Proline Promass 80E Technical Information

Proline Promass 80E, 83E

Pressure loss

Endress+Hauser
Pressure loss depends on the fluid properties and on the flow rate. The following formulae can be used to
approximately calculate the pressure loss:
Reynolds number
Re ≥ 2300 *
Re < 2300
Δp = pressure loss [mbar]
ν = kinematic viscosity [m2/s]
g = mass flow [kg/s]
* To compute the pressure loss for gases, always use the formula for Re ≥ 2300.
Pressure loss coefficients for Promass E
DN
8 5.35 · 10
15 8.30 · 10
25 12.00 · 10
40 17.60 · 10
50 26.00 · 10
[mbar]
10000
1000
100
10
1
0.1
0.01
0.001
Pressure loss diagram for water
2 · g
Re =
p n r
· d · ·
D n
0.25 1.85
g
p = K · ·
Dp = K1 · · n
g
+
ρ = fluid density [kg/m3]
d = inside diameter of measuring tubes [m]
K to K2 = constants (depending on nominal diameter)
d[m] K
–3 7
5.70 · 10
–3 6
7.62 · 10
–3 6
1.89 · 10
–3 5
4.42 · 10
–3 4
8.54 · 10
DN 8
0.1
1
r
–0.86
·
n
0.25 2
g
K2 · ·
r
K1
7
7.91 · 10
7
1.73 · 10
6
4.66 · 10
6
1.35 · 10
5
4.02 · 10
DN 40
DN 25
DN 15
DN 50
10
100
a0004623
a0004626
a0004628
K2
7
2.10 · 10
6
2.13 · 10
5
6.11 · 10
5
1.38 · 10
4
2.31 · 10
1000 [t/h]
a0004606
21