Operating two circulating pumps in parallel using one VSD
Operating two circulating pumps in parallel using one VSD
(OP)
Hi,
I am looking at an application from an energy saving perspective, where there are three circulating pumps in a manufacturing cooling process working in parallel with one another to provide the required amount of flow to the cooling application. All pumps are on/off control, and in most cases the flow required is just above the pumping capacity of one pump, so two pumps need to be left on at all times.
I am looking at the idea of operating the second pump using a Variable speed drive to control the speed of it, and the VSD controlled by a differential pressure input transducer to cause the VSD to operate at the required speed to maintain the required differential pressure across the pumping operation, and thus the load application.
thus only one pump would be run flat out, with considerable energy savings on the other.
Has anyone here ever tried this out, or can anyone see a reason why it might not work. Looking at the pump power curves I would see this as giving a constant head pressure across both pumps and the relative power input determining the flow through each pump, with the first pump pumping close to max capacity all the time.
Am i missing something that might cause this to operate incorrectly.
Thanks for any assistance rendered.
Marineelect.
I am looking at an application from an energy saving perspective, where there are three circulating pumps in a manufacturing cooling process working in parallel with one another to provide the required amount of flow to the cooling application. All pumps are on/off control, and in most cases the flow required is just above the pumping capacity of one pump, so two pumps need to be left on at all times.
I am looking at the idea of operating the second pump using a Variable speed drive to control the speed of it, and the VSD controlled by a differential pressure input transducer to cause the VSD to operate at the required speed to maintain the required differential pressure across the pumping operation, and thus the load application.
thus only one pump would be run flat out, with considerable energy savings on the other.
Has anyone here ever tried this out, or can anyone see a reason why it might not work. Looking at the pump power curves I would see this as giving a constant head pressure across both pumps and the relative power input determining the flow through each pump, with the first pump pumping close to max capacity all the time.
Am i missing something that might cause this to operate incorrectly.
Thanks for any assistance rendered.
Marineelect.





RE: Operating two circulating pumps in parallel using one VSD
JRaef.com
Eng-Tips: Help for your job, not for your homework Read FAQ731-376
RE: Operating two circulating pumps in parallel using one VSD
RE: Operating two circulating pumps in parallel using one VSD
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Operating two circulating pumps in parallel using one VSD
RE: Operating two circulating pumps in parallel using one VSD
Drivesrock
RE: Operating two circulating pumps in parallel using one VSD
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com