Siemens 7ML19985AB01 instruction manual BS-3680 U-Flume, P3 =

BS-3680 U-Flume, P3 = 4
‘U’ parameters required *			‘U’ parameters calculated **
U0	= approach diameter	Da	U4	= Cv
U1	= throat diameter	D	U5	= Cd
U2	= hump height	p	U6	= Cu
U3	= throat length	L	U7	= A

*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 g0.5 x Cv x Cu x Cd x D x h1.5
where : q = flow rate	Cv = velocity coefficient
g = gravitational acceleration	Cu = shape coefficient
b = throat width	Cd = discharge coefficient
h = head
RATIOMETRIC CALCULATION, P4 = 1¤
For flows that can be calculated by the equation:

q = qcal x Cu/Cucal x Cd/Cdcal x Cv/Cvcal x (h/hcal)1.5

where : q = flow rate

qcal = flow rate at maximum head h = head

hcal = maximum head

Cu = shape coefficient for head

Cucal = shape coefficient for maximum head Cv = velocity coefficient

Cvcal = velocity coefficient for maximum head Cd = discharge coefficient for head

Cdcal = discharge coefficient for maximum head

¤Refer to Operation \ Flow Calculation.

7ML19985AB01 OCM III 64