Calculation help needed

[hdp160]

Hi... Wavin 22mm Hep20 coiled pipe..... flow 12.5 ltr/minute...(at nominal mains water pressure at inlet) What I need to know is the expected water pressure drop over 50 metres. Many thanks in anticipation ...Nick

 

[hdp160]

BTW I've looked on their websiteam and I can't find it in the technical specifications

 

[Jay The Plumber]

if you reference the CIBSE design book, it reckons 22mm @ 12.5l/m (0.2125kg/s) and has a loss of .026 m(hd)/m

 

[hdp160]

Thank you very much Jay.... I make that a 1.3 metre head loss over 50 metres of pipe or about a 0.13 bar pressure drop?

 

[Jay The Plumber]

youre ahead of me there mate, I didnt calculate the total because I wasnt sure what the multiplier was for a bend on the loops.

 

[hdp160]

Thanks Jay..... I don't know if my sums are correct either? .. perhaps someone could give thumbs up or down..... BTW no fittings just the total pressure drop over the coil of pipe is what I'm after...

 

[Jay The Plumber]

Thanks Jay..... I don't know if my sums are correct either? .. perhaps someone could give thumbs up or down..... BTW no fittings just the total pressure drop over the coil of pipe is what I'm after...

yea mate, assuming I got my maths right then yours is fine

 

[hdp160]

Thanks...