Determining Length of Sewer Throttle Pipe 1

[robmclellan]

How do I determine the length of a sewer throttle pipe?

I need to limit flows to 60 l/sec within a 200DN DI sewer (ks value of 1.5 used)

What is the formula/ way of doing this?

Thanks

 

[rconner]

I am curious what exactly is this “sewer throttle pipe” you are talking about? If the “ks” is intended to be e.g. roughness “k” (as in Colebrook "formula" etc., that you will find in a good web search), I suspect you might get only 14 or 15 m of head loss per thousand meters or so of that size at least modern, smooth-lined ductile iron (DI?) pipe (and with much lower typical k, at least if intended to be in units of mm) flowing full at that flow rate.

 

[apdeguito2009]

Hi guy!

 

[bimr]

One would assume that you are referring to a flow throttling device such as a hydro-brake. These are typically sized by the manufacturer. See the link:

http://www.hydro-international.biz/wastewater/flowcontrol.php

http://www.geotechnics-uk.com/content/hydro-brake-flow-control-and-hydro-brake-chamber

 

[Ussuri]

Using a smaller bore pipe to restrict pass forward flows and cause the upstream to back up perhaps?

However, neither that or a hydrobrake is ideal. By restricting the flow you can cause solids to settle out upstream which can cause problems. Causing blockages. That said, I cannot think of any other ways to do it that dont carry the same risk.

 

[dicksewerrat]

Change the slope on a few hundred feet of pipe to get your desired flow rate. Use Manning's find the slope you need. If the velocity goes below 2.5 fps, you will get solid settlement.

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com