Sewer line removal and pump around 1

[jjdj]

Question: I work on an enviromental remediation project where we need to remove a section of a sewer line due to contamination. What we need to do, is order the correct rated pump to handle the flow rate of liquids that would normally pass through this line from the upgadient areas. There are several upgradient gravity lines that connect to this one and the load in these lines are primarily from runoff water only. Is there a nice rule of thumb for sizing a pump (e.g. for a 15 in line ...need this type pump) something like this or do you need to do some fluid dynamic calcs. I dont do this sort of thing much. Thanks for any help you can offer.

 

[dicksewerrat]

You will have to calculate the capacity of the pipe. Since you say the pipe carries runoff, it will flow ful.
You need the diameter of the pipe, slope of the pipe and type of material. Use the Manning's formula. where is this pipe? Call a couple of pumping contractors like Sunbelt to get costs.

 

[DMcGrath]

There are also specialty contractors that supply a turnkey package for temporary bypass lines. I have dealt with Thompson Pump (Port Orange, FL) on a 60 MGD bypass. I have contact info if you wish.

 

[jjdj]

Thanks dicksewerrat.

So if I calculate the velocity exiting this pipe using the mannings formula that will give me the maximum velocity and then the maximum Q after multiplying V*A, correct? Then base my pump size on this capacity. Do I need to know the upgradient contributions to this line based off the rationale formula (Q=CIA)or am I pretty much done after the Manning Equation? I appreciate your patience with my lack of experience on this. Thanks again.

 

[dicksewerrat]

That should give you the max flow rate for the pipe. A spwcialty contractor will give you the best price for this. If you try to get the pump and piping, set it up and have a standby pump available it will cost you about double what they will charge. They set it up, have oncall people and pumps. Cheap insurance. I think Godwin pump also does this.

 

[waterexpert]

For a once-off, i'd suggest using the online calcs at

http://www.lmnoeng.com

Regards
Seán

http://www.expertise-limited.co.uk