Manifold design

[evilchild]

I've been reading a lot of threads of manifold design but it is still confusing to me. Here is my problem:

I've a 4 inch inlet pipe which will bring in about 300-500 gpm of water from a pump. I need to design a manifold of about 7 ft length. We are going to drill holes into the 7 ft pipe to create orifices. I have to figure out the spacing and size of these orifices to get uniform flow rate from all the orifices. The pipe thickness would be 4 inches and the manifold will be used in vertical direction. Any help is greatly appreciate. Thank you

 

[BigInch]

I don't think you're missing anything. Manifold design for dispersement (small relative flows per hole), except for cross flow types, isn't that big a deal. Whenever velocity slows, due to fluid leaving one hole, the pressure in the next segment goes up, provided the fluid leaving doesn't appreciably reduce the average pressure in the manifold.

Independent events are seldomly independent.

 

[zdas04]

Katmar,
In a full tank you are exactly right. I was seeing it as an empty tank, and the dP would change over the length into an empty tank.

David Simpson, PE
MuleShoe Engineering

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