Flow, Rate, Pipe Diameter W/sump Pump - Plumbing - DIY Home Improvement | DIYChatroom


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Plumbing

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 12-09-2011, 08:05 AM   #1
Member
 
Join Date: Mar 2011
Location: Hoffman Estates, IL
Posts: 103
Rewards Points: 81
Default

flow, rate, pipe diameter w/sump pump


Hi
We had the power go out this season during a heavy rain, and my backup sump pump was almost going off continuously. When I ran outside to make sure the pipe was directed away from the house, I noticed the flow of water completely fillled the exit pipe and came out at a good rate.

Now I was thinking about installing a 2nd backup pump. IF both pumps ever go off at the same time, i.e. if one pump is overwhelmed and the last line of defense is needed, will this be too much flow for the 1.5"exit pipe?

What happens when you have two equal pumps, HD watchdog specials, doubling the rate into the same pipe?

Im trying to avoid putting another exit pipe in thru the siding.

Thanks!

Advertisement

D270 is offline   Reply With Quote
Old 12-09-2011, 08:47 AM   #2
Civil Engineer
 
Join Date: Mar 2009
Location: Boston
Posts: 4,308
Rewards Points: 2,194
Default

flow, rate, pipe diameter w/sump pump


The computation of flow through a single pipe driven by two pumps requires some relatively complicated analysis. The flow does not double, because the losses in the pipe increase as the square of the velocity, and the total flow is limited by the pumps needing to overcome the total losses in the system. You can either do the mathematics, which requires a lot of detail (exact pipe diameter, length of pipe, number of bends in the system, roughness of the pipe, elevation difference between the pump intake and the outlet, and the pump output curve) or you can assume you will get about 1.5 times as much flow as from a single pump. Probably close enough.

Advertisement

Daniel Holzman is offline   Reply With Quote
Old 12-09-2011, 11:53 AM   #3
Member
 
Join Date: Mar 2011
Location: Hoffman Estates, IL
Posts: 103
Rewards Points: 81
Default

flow, rate, pipe diameter w/sump pump


wow....ok, close enough sounds good.

Thanks!
D270 is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
How to stop sump pump discharge pipe freezing??? relbeig Plumbing 8 11-12-2012 01:03 PM
How to find out why your pool pump is not fully priming tripflex How To Guides 6 07-13-2011 07:31 PM
Sump pump operation MikeKy55 Plumbing 16 05-11-2011 05:35 PM
Is yellow polyethelene or polyphenol gas pipe now the preferred gas conduit? MarkSilber Plumbing 1 09-18-2010 01:10 PM
Insulate Underground Sump Pump Pipe Basic_Homeowner Landscaping & Lawn Care 1 07-23-2008 09:32 PM




Top of Page | View New Posts