Flow Rate Through a Manifold

[Komo421]

Hi

I want to select a pump for a quenching tank that has an intake manifold with 12 smaller pipe inlets to the tank. The flow rate required at the discharge is 170 m3/h, two pumps are being used with one in standby. Is it possible to calculate the flow rate for each small pipe on its own or is it sufficient to assume that the flow through each pipe will be the same 170/12 = 14.167 m3/h?

Thank you

 

[BigInch]

If you have a feed to the manifold near its center and/or, if the manifold is "sufficiently large diameter", you can assume they are all very much close to the same flows in all outbound. Sufficiently large diameter means that you will have no appreciable pressure drop from the manifold's inlet to the outlet that is farthest away. It also means that the same pressure at the inlet to each branch will produce the same flow in each branch. In other words, you must know the system curves of each branch are equal as well.

"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek

 

[Artisi]

and provided all the nozzles are at the same level.

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.)

 

[Komo421]

That is good news thank you for the help.

 

[bimr]

Systems like this are designed so that the outlets (nozzles) from the manifold have a larger pressure drop across the outlet than the pressure drop through the piping. This ensures that you have equal flow through each outlet from the manifold.