Parallel Pump Operations
Parallel Pump Operations
(OP)
Hello,
In parallel operations whether identical pump or not...
What could it change the system curve or pump performance in operations.
What is the point of the parallel pump applications. There could be many application types, For instance same or different point suction or discharging same point...
Thanks
In parallel operations whether identical pump or not...
What could it change the system curve or pump performance in operations.
What is the point of the parallel pump applications. There could be many application types, For instance same or different point suction or discharging same point...
Thanks





RE: Parallel Pump Operations
Dejan IVANOVIC
Process Engineer, MSChE
RE: Parallel Pump Operations
RE: Parallel Pump Operations
RE: Parallel Pump Operations
Your saying damage of impeller; It is same for identical pumps or different pumps operations....
Thanks.
RE: Parallel Pump Operations
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Parallel Pump Operations
Whether you are dealing with an existing system that has problems or must be modified or an entirely new system, there will be no substitute for developing a very thorough understanding of all of the characteristics of the system and its elements.
One caution, if the pumps (or some of the pumps) have relatively flat head vs. flow curves, very small changes in shaft speed can have dramatic effects. As an example, I have seen pumps shift loads effectively instantaneously where one pump momentarily "hogs" the load, and the flow rate at another pump "stalls." Since that pump no longer has much (or any) flow, its shaft speed increases because its motor operates with less "slip" due to the lower torque required. Since head varies with the square of shaft speed, the pump now can produce greater head, and it takes over the load forcing another pump into the "stall" situation. Meanwhile, the first pump that "hogged" the load has its shaft speed reduced because of the greater torque load on its motor. Since its head is reduced because of the reduced shaft speed, its ability to deliver to the system is reduced sometimes to the point of going into its "stall" in a continuing sequence of similar events.
Valuable advice from a professor many years ago: First, design for graceful failure. Everything we build will eventually fail, so we must strive to avoid injuries or secondary damage when that failure occurs. Only then can practicality and economics be properly considered.