Pipe kw carrying capabilities

[Devonplumber]

Evening gents I have been trying to work out pipe loads but have be unable to find any formula or charts to help. Can anyone tell me the kw carrying capabilities at 1.5ls with 20c drop on 35mm,42mm,54mm,2.5"'3",4"?

 

[hammers4spanner]

Evening gents I have been trying to work out pipe loads but have be unable to find any formula or charts to help. Can anyone tell me the kw carrying capabilities at 1.5ls with 20c drop on 35mm,42mm,54mm,2.5"'3",4"?

any reason why?

isn't this normally left to mechanical engineers design specs?

 

[hammers4spanner]

think ermintrude is normally pretty good at knowing this

 

[Devonplumber]

I have been fitting biomass for 3 years and want to move on to design but everyone you ask doesn't want to tell you wait they already know.

 

[IDCHAPPY]

Tamz too, I admit I've not learned it

 

[Nostrum]

Domestic heating design guide has it all in.

 

[missplumb]

35mm - 62kw @ 20DT
42mm - 100kw
54mm - 160kw
67mm - 235kw
76mm - 310kw
108mm - 650kw
past that and your into mechanical engineer realms,

 

[Meady]

What's 22 and 28 out of intrest

 

[SilentMike]

8 is 2.7kw
10 is 4.3kw
15 is 11kw
22 is 23kw
28 is 40kw

 

[missplumb]

8mm - 2.7kw
10mm - 4.3kw
15mm - 11kw
22mm - 23kw
28mm - 40kw
35mm - 62kw

 

[missplumb]

Doh!!!! beat me to it

but obviously you also have to take into account pipe, fittings and all other resistances when calculating the correct size of pipe to use

 

[AWheating]

8 is 2.7kw
10 is 4.3kw
15 is 11kw
22 is 23kw
28 is 40kw

these out the design guide? copper? 20degree diff?? these mainly seem a little on the high side. from my memory.

 

[stevetheplumber]

we always worked to 10000 btus on 15 50 000 btus on 22, 120 000 on 28

 

[missplumb]

its taken from the 2011 edition of the design guide

 

[Sharp Point]

its taken from the 2011 edition of the design guide

Yes, i'll advocate that and as a matter of fact Ive got a revised 2013 edition in my lap as we speak.

 

[missplumb]

my mrs does all our design work so she uses the cibse technical guides, it was the only book on her shelf that i understood enough to post details LOL!!

 

[Ermintrude]

Wilo have a good app and the guide is here. http://www.academia.edu/6817441/CIBSE_Concise_Handbook_CIBSE_Concise_Handbook

 

[Ermintrude]

But the 40kw on 28 is fine. U can get it through 22mm according to guide! Doh!

 

[missplumb]

you probably could but the increase in pressure and velocity would make it noisy - so she says....

 

[AWheating]

its taken from the 2011 edition of the design guide

speed fit? Copper? Steel?

Just incase somebody reads this and assumes.

 

[missplumb]

copper