Pressure loss formulas for promass a, Pressure loss coefficient for promass f – FMC Corporation - Talstar 80 Benutzerhandbuch
Seite 102
Technical data
Proline Promass 80 PROFIBUS PA
102
Pressure loss formulas for Promass A
Pressure loss coefficient for Promass F
a0001396
Fig. 42:
Pressure loss diagram for water
Reynolds number
a0003381
Re
≥ 2300 *
a0003380
Re < 2300
a0003379
Δp = pressure loss [mbar]
ν = kinematic viscosity [m2/s]
g = mass flow [kg/s]
ρ = density [kg/m³]
d = inside diameter of measuring tubes [m]
K to K1 = constants (depending on nominal diameter)
* To compute the pressure loss for gases, always use the formula for Re
≥ 2300.
DN
d[m]
K
K1
K2
8
5.35
⋅ 10
–3
5.70
⋅ 10
7
9.60
⋅10
7
1.90
⋅ 10
7
15
8.30
⋅ 10
–3
5.80
⋅ 10
6
1.90
⋅ 10
7
10.60
⋅ 10
5
25
12.00
⋅ 10
–3
1.90
⋅ 10
6
6.40
⋅ 10
6
4.50
⋅ 10
5
40
17.60
⋅ 10
–3
3.50
⋅ 10
5
1.30
⋅ 10
6
1.30
⋅ 10
5
50
26.00
⋅ 10
–3
7.00
⋅ 10
4
5.00
⋅ 10
5
1.40
⋅ 10
4
80
40.50
⋅ 10
–3
1.10
⋅ 10
4
7.71
⋅ 10
4
1.42
⋅ 10
4
100
51.20
⋅ 10
–3
3.54
⋅ 10
3
3.54
⋅ 10
4
5.40
⋅ 10
3
150
68.90
⋅ 10
–3
1.36
⋅ 10
3
2.04
⋅ 10
4
6.46
⋅ 10
2
250
102.26
⋅ 10
–3
3.00
⋅ 10
2
6.10
⋅ 10
3
1.33
⋅ 10
2
Re = p
n r
· d · ·
4 ·
g
D
n
r
p = K ·
·
·
0.25
1.75
–0.75
g
D
n
p = K1 · · g
DN 50
DN 40
DN 25
DN 8
10000
1000
100
10
1
0.1
0.001
0.01
0.1
1
10
100
1000
DN 15
DN 80
DN 100
[mbar]
[t/h]
DN 150
DN 250