Siemens OCM III, Инструкция по эксплуатации, Страница: 67 / 112

BS-3680 THIN PLATE RECTANGULAR WEIR, P3 = 6
‘U’ parameters required * ‘U’ parameters calculated **
U0 = approach width B U3 = Ce
U1 = crest width b U4 = K
b
U2 = crest height p
*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
=
Ce x
2
⁄
3
√⎯⎯⎯
2 g x be x
(
h
e
)
1.5
where : q = flow rate Ce = a function of h, p, b and B
g = gravitational acceleration be = effective crest width (b + K
b
)
b = crest width h
e
= effective head (h + K
h
)
h = head K
h
= 1 mm
RATIOMETRIC CALCULATION, P4 = 1
¤
For flows that can be calculated by the equation:
q = q
cal
x Ce/Ce
cal
x (h/h
cal
)
1.5
where : q = flow rate
q
cal
= flow rate at maximum head
h = head
h
cal
= maximum head
Ce = discharge coefficient for head
Cv
cal
= discharge coefficient for maximum head
¤
Refer to Operation \ Flow Calculation.
7ML19985AB01 OCM III 68