3.5.1 Pressure Conditions In The Plant And At The Regulator - Samson 46-5 Mounting And Operating Instructions

Operation

3.5.1 Pressure conditions in the plant and at the regulator

On selecting the differential pressure set point or set point range, note that the differential
pressure set point results from the known pressure drop across the fully open plant and the
differential pressure created at the restriction (orifice).
The flow rates with known differential pressure at the restriction are specified in Table 2.
Δp = Δp
set point
The minimum required differential pressure between the flow pipe and the return flow pipe is
calculated as follows:
Δp = Δp
min
Δp
Minimum differential pressure between the flow and return flow pipes in bar
min
Δp
Differential pressure created at the restriction to measure the flow rate in bar
restriction
Δp
Differential pressure set point in bar
set point
Δp
Differential pressure when the plant is fully opened (pressure drop) in bar
plant
.
V Adjusted flow rate in m³/h
K Valve flow coefficient in m³/h
VS
Fig. 6 shows schematically the pressure conditions in the plant.
p
1
Fig. 6 · Pressure conditions at the regulator
12
EB 3130 EN
+ Δp
plant restriction
& V
⎛ ⎞
2
⎜ ⎟
+
set point
⎜ ⎟
K
⎝ ⎠
VS
Δp
min
Δp
set point
Δp
plant
Type 46-5
Type 46-6
Δp
restriction
or
p
2