Endress+Hauser Proline Promass 80 - Pressure loss; Pressure loss formulas for Promass F, M and E

10 Technical data PROline Promass 80
90 Endress+Hauser
Pressure loss Pressure loss depends on the fluid properties and on its flow rate.
The following formulas can be used to approximately calculate the pressure loss:
Pressure loss formulas for Promass F, M and E
Pressure loss formulas for Promass A, H and I
Reynolds number
Re
≥ 2300
1)
Re < 2300
∆p = pressure loss [mbar]
υ = kinematic viscosity [m
2
/s]
= mass flow [kg/s]
ρ = fluid density [kg/m
3
]
d = inside diameter of measuring tubes [m]
K...K2 = constants (depending on nominal diameter)
1)
To compute the pressure loss for gases, always use the formula for Re ≥ 2300.
Reynolds number
Re
≥ 2300
1)
Re < 2300
∆p = pressure loss [mbar]
υ = kinematic viscosity [m
2
/s]
= mass flow [kg/s]
ρ = fluid density [kg/m
3
]
d = inside diameter of measuring tubes [m]
K...K3 = constants (depending on nominal diameter)
1)
To compute the pressure loss for gases, always use the formula for Re ≥ 2300.
Re
2m
·
⋅
π
d υρ⋅⋅⋅
---------------------------
=
∆
p
K
υ
0,25
m
·
1,85
ρ
0,86–
⋅⋅ ⋅
=
∆
pK1υ m
·
K2 υ⋅
0,25
m
·
2
⋅
ρ
-------------------------------------
+⋅⋅=
m
·
Re
4m
·
⋅
π
d υρ⋅⋅⋅
---------------------------
=
∆
p
K
υ
0,25
m
·
1,75
ρ
0,75–
K3 m
·
2
⋅
ρ
--------------------
+⋅⋅ ⋅
=
∆
pK1υ m
·
K3 m
·
2
⋅
ρ
--------------------
+⋅⋅=
m
·