2 pipe hydronic system

Dan Foley

Karl,

I can't say it any better than Mark just did. -DF

PS Karl & I worked together at Arlington Heating many years ago. He was also in the trade in Denver at one time. Maybe he has crossed paths with you, ME?

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reddog

2 pipe hydronic system

my partner and I disagree a bit, maybe someone can provide a solution.
On a newly installed 2-pipe system, with the pump sized appropriate for the job, is it absolutely nessesary to have the take-offs to the radiators come off the main with a 45 degree?

Empire_2

45* angle

This angle is not always possible and in my opinion as long as your pump is pumping away from the expansion tank and it is sized properly to move entrained air in the system, I dont care if you pipe up down 45* 66 etc...

Robert O'Connor_7

Karl.

If your pump is sized right and is "Pumping Away" I see no reason to change the piping. A forty five will flow better than a ninety but only slightly. Arguements could be made for both but IMHO doesn't effect much especially if you use circuit setters or TRV for control.

Robert O'Connor/NJ

Mark Eatherton1

Any time...

You can reduce the friction of the piping, it will result in a better (higher) flow rate to the heat emmitters.

I prefer to use 45's, but I think it's more of the craftsman in me then common sense, because I've seen MANY systems where not one 45 degree fitting was used, and it works just fine.

Remember this. All of the components and flow rates that we choose in the design of our heating systems is based on "design" conditions. Those conditions rarely occur for more than 2% of the time that the system is running.

Also, our heat loss calculations do not take into consideration "real time events", like internal gains, solar gains and the flywheel mass effect of the building itself.

In reality, all of the components we are selecting, and installing, are oversized by at least 30 % and possibly as high as 50% depending on your situation.

So, as it pertains to maintaining the craft in craftsmanship, I say go for it. As it pertains to delivering silent comfort, it doesn't really make that big of a difference, unless you're designing way out on the bleeding edge of reality anyway, in which case you'd BETTER know what you're doing...

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ME

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bigugh_4

45's are swinging joints

45's were used mostly to allow pipe expansion without pushing branch piping against the holes in the floors. two 90's and a 45 made a expansion of the main possible. better than 4-90's. The Flexable pipe we now have has done away with that. I did get into a copper system that busted itself apart because of expansion in a ell. so it happens all the time. Just think where the main is going to go, when it heats up and push comes to shove how are the branches going to behave. Its kinda like freezing, no amount of insulation will protect a pipe from freezing, insulation only changes the time it takes, Heat and heat alone prevents freezing!

reddog

Thanks Dan I do appreciate the chance and the Knowledge that you gave me.