What Pipe size to use?

[tamerbeeh]

The flow rate is 7 m3/hr and pressure of 44 BAR , what the PVC pipe size to be picked ? and why ?

Second question if 7 pipes of the above are connected into header what will be the size of the PVC header ?

Thanks

 

[europipe]

Gas? Liquid? Roughly:
In case of gas velocity max. 30m/s in case of liquid max. 3 m/s.
Then you can calculate the size of the pipe.
Buy Crane TP410 for further education.

 

[tamerbeeh]

Fluid is Water and i need to know how to calculate it and how to get the velocity

 

[Latexman]

At 44 bar, you also have to worry about not exceeding MAWP. That may limit the size too.

Good luck,
Latexman

 

[zdas04]

What page is that on in your text book? The question sure looks a lot like homework to me.

David

 

[Latexman]

tamerbeeh,

If homework, the professor wants to measure your knowledge and ability, not ours.

Good luck,
Latexman

 

[tamerbeeh]

Hey , I just want to design it for the Reverse osmosis unit i am working in !! ..It's not homework , i need to get the pipe sizes to make the purchasing order!

 

[chicopee]

Not only pressure but also temperature to worry about. Wire mesh reinforcement may work. Since you are an engineer, have you thought about Bernouilli's equation.

 

[BigInch]

One size larger than the inlet/outlet of the RO unit.

Let your acquaintances be many, but your advisors one in a thousand’ ... Book of Ecclesiasticus

 

[europipe]

And order the reducers then too. ;-)

 

[BigInch]

Oh, and make the header 2 sizes bigger than that.
Feed the header, or take from the header, from its middle.

Let your acquaintances be many, but your advisors one in a thousand’ ... Book of Ecclesiasticus

 

[Artisi]

When all else fails, employ a qualified engineer to sort out your problems.

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.)

 

[BigInch]

Finally .... some good advice.

Let your acquaintances be many, but your advisors one in a thousand’ ... Book of Ecclesiasticus

 

[Artisi]

I've had second thoughts re your posting - however, you need to do some work

http://www.engineeringtoolbox.com/pvc-cpvc-pipes-pressures-d_796.html

http://www.engineeringtoolbox.com/pvc-pipes-friction-loss-d_803.html

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.)

 

[zdas04]

So you noticed that PVC at 68F can only handle 44 bar in Sched 80 in sizes 1-inch an smaller.

That was the main reason that I was pretty sure that this was homework--only in a classroom would someone specify to the design engineer that he was required to use a specific material. I've had clients tell me that they prefer a particular material, and I try to accomodate their preferences, but if the pipe needs to be 8-inch, and it needs to handle 638 psig I know that PVC or HDPE aren't going to cut it.

David

 

[Latexman]

How long are these lines? 1m? 1km? In between?

What's the pressure drop of the RO unit when clean and when dirty?

How much pressure do you need to push the RO water to where it needs to go?

It seems there are more questions, than answers.

Good luck,
Latexman

 

[BigInch]

In the end I've always found that the number of answers equals the number of questions and where that chain stops is usually determined by who's asking.

Let your acquaintances be many, but your advisors one in a thousand’ ... Book of Ecclesiasticus

 

[boo1]

Volumetric flow, Q, can be determined from the continuity equation = A*V

Modified for flow in gallons per minute, this is:
Q = 2.448*V*d**2
Where Q = Volumetric flow, gpm
V = Velocity, ft/sec, assume V=8 ft/sec (water max V for plastic pipe)
d = Inside diameter, inches


d=sqrt(30.8/(2.448*8))=1.25 inches