pipe sizing for DN20

[Simon F]

I am looking to do a job with corrugated pipe.
The stuff in plumbfix is a good price.
The info given is that the internal diameter is 21.12mm

I know that 22mm is on the same chart as copper, but is the DN20 less?
I can only find a chart for DN22 (Tracpipe)

Has anyone got this or is it classed the same?

 

[ShaunCorbs]

Run your calcs as dn20

http://gasproducts.co.uk/fileuploader/download/download/?d=0&file=custom/upload/File-1447802321.pdf

 

[Simon F]

Yes I did see the gastite chart aswell.
that also lists DN22 but gives a different set of figure to tracpipe???

 

[ShaunCorbs]

Yes I did see the gastite chart aswell.
that also lists DN22 but gives a different set of figure to tracpipe???

Dn20 posted wrong link (pg11)

 

[Simon F]

the gastite web page listed a free app.
it is basic put in the pipe length and size to get the max kw.
simple to use.