Proline Promass 80A, 83A
22
Hauser
Pressure loss in SI units
Pressure loss depends on the fluid properties and on the flow rate.
The following formula can be used to approximately calculate the pressure loss:
Pressure loss coefficients
a0003595
Pressure loss diagram for water
1
Standard version
2
High-pressure version
Reynolds number
a0003381
Re
≥
2300
1)
a0003380
Re < 2300
a0003379
–
Δ
p = pressure loss [mbar]
– v = kinematic viscosity [m2/s]
–
g
= mass flow [kg/s]
–
ρ
= density [kg/m³]
– d = inside diameter of measuring tubes [m]
– K…K1 = constant (depends on nominal diameter)
1)
To compute the pressure loss for gases, always use the formula for Re
≥
2300.
DN
Standard version
High-pressure version
[mm]
d [m]
K
K1
d [m]
K
K1
1
1.1 · 10
–3
1.2 · 10
11
1.3 · 10
11
–
2
1.8 · 10
-3
1.6 · 10
10
2.4 · 10
10
1.4 · 10
-3
5.4 · 10
10
6.6 · 10
10
4
3.5 · 10
-3
9.4 · 10
8
2.3 · 10
9
3.0 · 10
-3
2.0 · 10
9
4.3 · 10
9
Re =
p
n r
· d ·
·
4 ·
g
D
n
r
p = K ·
·
·
0.25
1.75
–0.75
g
D
n
p = K1 ·
·
g
[mbar]
[kg/h]
1
DN 2
10000
1000
100
10
1
0.1
1
10
100
1000
DN 4
DN 1
2
