Need flow rate calculation for telescoping valve 2

[TLF1]

We have a 24 inch telescoiping valve with a maximum head differential of 3'-3". I would like to find a calculation or chart that We can use to estimate the flow rate at various differentials.

 

[coloeng]

You probably need to get that from the manufacturer, or post who the manufacturer is so that others will know what to provide.

 

[TLF1]

The manufacturer of the telescoping valve(s) is Whipps. I could not locate a flow chart on their web site.

 

[bimr]

There is no simple chart for something like that.

You will have to estimate the flow using the orifice equation with assumptions on pipe size, etc.

http://www.efunda.com/formulae/fluids/draining_tank.cfm

 

[zabrab]

If you cannot get a flowchart from the manufacturer, you can estimate flow as a weir for low heads and an orifice for higher heads.

E&S pond designers use a riser pipe for spillways. There is a good explanation in Section 13.6.10 (pg 41 in the link). It may give a procedure you can use.

http://www.dcr.virginia.gov/documents/swmhndbkdrft_ch13.pdf

The sticking point will be the transition between the flow regimes. It is not well defined so you will have to use your best judgement there.