Bs-3680 U-Flume, P3 = 4 - Siemens OCM III Instruction Manual

BS-3680 U-Flume, P3 = 4

'U' parameters required *
U0 = approach diameter
U1 = throat diameter
U2 = hump height
U3 = throat length
*
obtain from manufacturer's specifications.
**
calculated by OCM-3. May be viewed by accessing 'U' parameter.
Reference
ABSOLUTE CALCULATION, P4 = 0
For flows that can be calculated by the equation:
1.5 0.5
q = (2/3) x g x Cv x Cu x Cd x D x h
where : q = flow rate
g = gravitational acceleration
b = throat width
h = head
RATIOMETRIC CALCULATION, P4 = 1
For flows that can be calculated by the equation:
q = q x Cu/Cu x Cd/Cd
cal cal
where : q = flow rate
q = flow rate at maximum head
cal
h = head
h = maximum head
cal
Cu = shape coefficient for head
Cu = shape coefficient for maximum head
cal
Cv = velocity coefficient
Cv = velocity coefficient for maximum head
cal
Cd = discharge coefficient for head
Cd = discharge coefficient for maximum head
cal
¤
Refer to Operation \ Flow Calculation.
7ML19985AB01
Da
D
p
L
¤
1.5
¤
x Cv/Cv x (h/h
cal cal
OCM III
'U' parameters calculated **
U4 = Cv
U5 = Cd
U6 = Cu
U7 = A
Cv = velocity coefficient
Cu = shape coefficient
Cd = discharge coefficient
1.5
)
cal
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