Pumps Capacity
Pumps Capacity
(OP)
We did install FLYGT Pumps. In theory the pump can give 16.4 lit / second at 5.1 m Head. We found out that the pump gives us 12 lit/sec only. What can be the problem??
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RE: Pumps Capacity
1) Reduce the system resistance
2) Use higher dia impeller. This can be confirmed by the supplier.The motor size should be checked.
Hope u find these helpful.
Vishy.
RE: Pumps Capacity
I assume that the flow/head that you are looking for is the 16.4 l/sec at 5.1 mtrs.
The reduced flow you are getting could caused for several reasons, a few are :
1- How have you sized the "total delivery head" of 5.1 mtrs.
and did you use the correct number of bends,valve and pipe lengths, diameter of pipe, friction factor for the pipe used ??
2- Using a submersible pump, from what level did you measure the "static head " from for the pump, and to what level for the discharge point ?
3- Check the pump motor direction of rotation, before you do anything else, if its a Flygt and fitted with a 3 phase motor it should "Kick" anti clockwise (left) as you look from the top of the pump, on starting,you will most likely need to lift the pump out of the sump to check properly, if your experienced in what to look for. It the motor is larger than say 4.0 kewat, it may have Star/delta starting, if so there should be two kicks
( each about 6 seconds apart )
There are many other possible reasons, would need more info. to give additional help,just ask if you wish more help.
Good luck
Electricsub
RE: Pumps Capacity
RE: Pumps Capacity
1. Determine if the pumps are operating on their published curve.
2. Determine if there is air trapped in high spots in the force main.
3. Check your design. We all take shortcuts and assumptions that sometimes fail to model real world conditions. I have been using a software package called PS-1 that does a good job. You can download a trial version from CivilWorld.com in the hydraulics download section.