Copper friction tables- 50 and 60 degree means

[solarCH]

Can anyone pls share a link to friction loss table for copper pipes at various dimensions?

I have the CIBSE Guide C but this (and it would appear most online tables) are for 75 degrees, would be useful to have tables for 50 and 60 degree mean temp (ie 45/55 and 50/70 designs)

 

[markfxy]

what for?

 

[REDSAW]

its all in here..

Installation Tips

 

[markfxy]

we don't have a big enough range of pipe sizes in the uk to worry about that its either gonna be 15/22 or 28 just use your common sense

 

[Sid Viscous]

Wouldn't have thought it would be all that much difference, unless you're working right to the limits

 

[solarCH]

its all in here..

Installation Tips

Thank you! I found this PDF had all the key information.

 

[solarCH]

we don't have a big enough range of pipe sizes in the uk to worry about that its either gonna be 15/22 or 28 just use your common sense

Bit worried about noise, copper runs in key areas are visible. Rest is MLCP. Its quite a big install, two flats with one boiler and some large rads.

 

[solarCH]

Back to this!

I read flow rates in copper should be between 0,3 and 1,5 m/s, the 0,3 being the limit to avoid sludge and 1,5 the limit for noise.

So the first thing I note is that MLCP 16mm piping has a MAX recommended flow rate of 0,3m/s at the radiators, 0,5m/s rad dist and 1,0m/s in the main dist pipes. Flow rates for 600W rads in a 70/50 design drop to 0,09m/s in the Uponor tables. So is sludge not a problem with MCLP?

There are 4-6m sections in the next install which cant be buried so instead of MLCP, we will use copper pinned to the wall and painted. So we have small 1,2kW rads at the end of 4m runs which must pass at less than 0,5m of people seated. Worried about noise, though we could run at 15 or 18 until I did the math: with a 70/50 design, 18x1,0mm would have a flow of 0,07m/s for a 1.2kW rad... so even a 10x0,6mm pipe would only be 0,24m/s.

Are these figures right? Can we solve the sludge issue with chemicals?

 

[Howsie]

Yes you can. Chemicals and good quality materials make a huge difference.

 

[solarCH]

which chemicals? Compound or a brand would be helpful- thansk