Pump Design In WaterCAD 6.0
Pump Design In WaterCAD 6.0
(OP)
Can anybody please,tell me how to design a pump in WaterCAD 6.0.Our project site has 130 ft of elevation difference.
When iam trying to use standard extended method for the pump.It is showing me fields to input shutoff head, design head and discharge, and Max operating head and discharge.What are these fields exactly.
Your help is greatly appreciated.
When iam trying to use standard extended method for the pump.It is showing me fields to input shutoff head, design head and discharge, and Max operating head and discharge.What are these fields exactly.
Your help is greatly appreciated.





RE: Pump Design In WaterCAD 6.0
RE: Pump Design In WaterCAD 6.0
Build your network in WaterCAD, include appropriate minor losses (bends, Ts, expansions/contractions, etc.) and try out various real pump configurations.
You will probably have to design for some fire flow and the local authority and/or State will have rules for this. You may be required to provide fire flow in addition to normal peak flow, with some residual pressure, at the highest point.
RE: Pump Design In WaterCAD 6.0
Mr. McGrath and Mr. Francesca.
How can I find out the design head.My project is a residential custom homes on the hill. We need to feed the water from existing reservoir tank which is appr. 130 ft lower from the highest finish floor using a pump.Minimum pressure required is 45 psi and max is 95 psi.Velocity of the pipes should not exceed 20fps.These are the agency criteria.
Can you suggest any manufacturer manual for this kind of situation.
Thanks
RE: Pump Design In WaterCAD 6.0
Check the average flowrate required (you can find some details on residential consumption from past threads). 20 fps is a high velocity, though not very bad. I would consider not more than 10 fps. Once you fix the pipe size corresponding to the required flowrate and the design velocity, you can check the pressure drop by Darcy's equation or any other formulae comfortable to you.
This software will be of much use to you,
http://www.xs4all.nl/%7Ekostermw/dP/
Add the pressure drop in the pipe to the discharge elevation and you will end up with the head requirement of the pump.
Crane Technical Paper 410 is an excellent reference for pipe sizing calculation.
RE: Pump Design In WaterCAD 6.0
The velocity limit will set the pipe size. You need to come up with some demand flows -- fire flow, if required by the agency, and consumption, with appropriate peak factor.
Smith & Loveless is a popular pump manufacturer and their engineers will work with you to check your design.
Really, if you don't know how to design a pump, you should hire an expert. Pump stations are expensive, and purchasing the wrong pump because you made a small error in the calculations (forgetting to add minor losses, using too high of a Hazen-Williams coefficient, etc) will cost far more than the services of an experienced engineer to design the pump.
RE: Pump Design In WaterCAD 6.0
then you will get the friction losses. Add the friction loss to the head loss to get the total head. Multiply it by a factor approx 10% to get the design head of the pump.
Having obtained the design head and already you have the flow that the pump has to deliver you have to fill them in WaterCad.
If it is not clear, use the help in WaterCad or have a look on Haestad Book, "Advanced Water Modeling..."