Siemens OCM III, Инструкция по эксплуатации, Страница: 65 / 112

BS-3680 FINITE CREST WEIR, P3 = 5
‘U’ parameters required * ‘U’ parameters calculated **
U0 = crest width b U3 = C
U1 = crest height p U4 = Cp
U2 = crest length L
*
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:
q = (2/3)
1.5
x g
0.5
x C x Cp x b x h
1.5
where : q = flow rate C = a function of h and L
g = gravitational acceleration
b = crest width
Cp = a correction factor as a function
h = head of h and p applied to C
RATIOMETRIC CALCULATION, P4 = 1
¤
For flows that can be calculated by the equation:
q = q
cal
x C/C
cal
x Cp/Cp
cal
x (h/h
cal
)
1.5
where : q = flow rate
q
cal
= flow rate at maximum head
h = head
h
cal
= maximum head
C = discharge coefficient for head
C
cal
= discharge coefficient for maximum head
Cp = correction factor for C
Cp
cal
= correction factor for C
cal
¤
Refer to Operation \ Flow Calculation.
7ML19985AB01 OCM III 66