Sizing the piping of a water drainage system

[majs1978]

Hi all,

I’ve a drainage water system (represented in the attached picture) with the following data:


4 submergible electric pumps (4X225 m3/hour)
The piping must be in stainless steel.
Volumetric flow is 237m3/hour.
Manometric high is 90m.


I need help to start the piping sizing, step by step. I need to calculate the:

1. Pipe inside diameter
2. Wall thickness and material
3. Pipe bends
4. Pressure losses

Thanks for your help

 

[BigInch]

Won't work. Your check valves are backwards.

"Make everything as simple as possible, but not simpler." - Albert Einstein (1879-1955)
***************

http://virtualpipeline.spaces.live.com/

 

[BigInch]

Also need the design code and pipe lengths.

How is it that Pump flow = 225 and pipe flow = 237?

"Make everything as simple as possible, but not simpler." - Albert Einstein (1879-1955)
***************

http://virtualpipeline.spaces.live.com/

 

[majs1978]

Could you be more specific?

thanks

 

[BigInch]

try this,

http://www.pressure-drop.com/Online-Calculator/pda/0101.html

"Make everything as simple as possible, but not simpler." - Albert Einstein (1879-1955)
***************

http://virtualpipeline.spaces.live.com/

 

[Artisi]

Need more detail
length of pipelines, number of bends and head loss figures thru the various control valves etc. Minimum water level in the supply tank and the maximum level of the discharge tank - or look at the link from BigInch

 

[majs1978]

I don't have the data that you ask for...i will try to talk with my client.

I'm not a mechanical engineer, so i've many difficults in this subject, has you understand.

Do you know some internet site or some kind of guide?

Best regards

 

[Artisi]

What you are asking is a very simple straight forward task given the right information - review the answers given so far for the information needed to give a meaningful answer.

 

[pumposervicio]

hi majs1978

you need to specify the lenght of pipe to determine the pipe size and the friction losses in linear pipeline and which is the correct flow requirement? how many pump will running at a time concerning the total value of flow rate?

but here's some info that will help you.

friction loss of typical fittings: 225cu.m/hr


stainless materials : elbow (150mm @ 90deg ) = 0.45m
45deg = 0.24m
gate valves (150mm ) = 0.12m
check valves ( 150mm ) = 1.5m vertical
( swing type) = 0.75m angled

 

[vpl]

Is this homework?

If it's not, then I'd suggest finding a copy of Crane Technical Paper 210, "Flow of Fluids." It's available in both English and SI units and will walk you through the process.

Then realize that the process will be iterative. You will need to make some starting assumptions, such as your piping lengths and head losses through fittings and valves, calculate values, then go back and adjust your assumptions.

As BigInch pointed out, you need to decide what construction code you're required to follow as that will affect piping sizes.

By the way, BigInch, I don't think his check valves are backwards, he's pumping from the lower reservoir up to the one in the upper right of his drawing (based on the arrows). The check valves will prevent drainback to the lower reservoir.

Patricia Lougheed

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[BigInch]

Patricia, thought the dot was subsituted for missing directional arrows (dot shows on downside [to pumps]).

"If stupidity got us into this mess, then why can't it get us out?" - Will Rogers (1879-1935) ***************

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