Register to reply

How to get from pump flow rate to pressure change

by zzinfinity
Tags: head, pressure, pump
Share this thread:
zzinfinity
#1
Nov8-12, 05:48 PM
P: 47
Hi,
Essentially what I need is a pump that will pump 40 gallons of water per hour to a height of 8 feet. Ignoring pressure losses in the lines (for now) I used the bernouli equation to determine that I need a pressure change of 3.44 psi in my pump. I found these pumps that look suitable but all list a max head far lower than the 8 feet I need. http://www.drsfostersmith.com/produc...m?pcatid=21414

I was thinking maybe just use one with a higher volume flow to compensate for the head loss. Maybe the 100 gph one? Is there a way to determine exactly what I need? Thanks!
Phys.Org News Partner Engineering news on Phys.org
Tiny UAVs and hummingbirds are put to test
Britain to trial driverless cars from 2015
NIST corrosion lab tests suggest need for underground gas tank retrofits
SteamKing
#2
Nov8-12, 06:43 PM
Emeritus
Sci Advisor
HW Helper
Thanks
PF Gold
P: 6,334
If the pump cannot deliver a head greater than 8', increasing the flow will not compensate. Find a pump which can deliver at least 8' of head, or re-design the piping system to reduce the head loss.
zzinfinity
#3
Nov8-12, 06:54 PM
P: 47
Fascinating. Fluid mechanics has always baffled me. Thanks!

huntoon
#4
Nov8-12, 07:50 PM
P: 145
How to get from pump flow rate to pressure change

http://www.drsfostersmith.com/pic/ar...id=285&aid=282

here is their product comparison including head values.
zzinfinity
#5
Nov8-12, 10:30 PM
P: 47
Out of curiosity, is there a fundamental reason why a pump that can pump 200 gph to a height of 5 feet, can't also pump 100 gph to a height of 10 feet?


Register to reply

Related Discussions
Flow rate in a pump Mechanical Engineering 14
Building a high flow rate pulsatile pump Engineering Systems & Design 0
Pressure change and flow rate Introductory Physics Homework 1
Flow rate depending on pressure with constant inlet rate. Engineering, Comp Sci, & Technology Homework 1
Pump head and flow rate relation Mechanical Engineering 3