# PUMP SIZING

### PUMP SIZING

Does anyone know what the pipe size coefficient is for steel pipe? My system is plumbed using black pipe in 1.25", 1.5", and 2". The only information I can find is for copper and PEX. I need the coefficient in order to size my circulator pump correctly.

Thanks

OSIRIS
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### Re: PUMP SIZING

if you do a search on here, there is a gentlemen Yanche that helps most of us out. Don;t know if this will help.

Yanche's Toolbox, Piping & Circulator Selection Method

WNY
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### Re: PUMP SIZING

http://www.engineeringtoolbox.com/pipes ... -t_18.html

BigBarney

This is probably the charts you need.

http://www.engineeringtoolbox.com/steel ... _1145.html

BigBarney
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### Re: PUMP SIZING

http://www.engineeringtoolbox.com/pipes ... -t_18.html

BigBarney

This is probably the charts you need.

http://www.engineeringtoolbox.com/steel ... _1145.html

I would suggest using the the design method I outlined. Just use the closest ID copper pipe coefficients to the iron pipe sizes. The D'Arcy-Weisbach formula is more difficult to use and the published iron pipe coefficients are for cold water only. Extending the coefficients to boiler water temperatures is possible but again it's complicated. The D'Arcy-Weisbach method is used for all kinds of fluids, water to poop, filled to partially filled pipe, etc. Much more complicated than needed for hydronic heating piping.

Yanche
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### Re: PUMP SIZING

Just a 'heads-up' when Yanche says it's complicated it's COMPLICATED !!!

Greg L

LsFarm
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### Re: PUMP SIZING

I'll let one of my "secrets" out of the bag.

There is a free software download for windows PC from Bell and Gosset call "System Sizer"

It is a software version of the old plastic wheel calculator I have been using for the past 30 years.

It is good for steel and copper pipe.

It also has a good design manual with it.

http://completewatersystems.com/brand/b ... tem-syzer/

A little knowledge can be a dangerous thing, so read carefully.

steamup
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