Head Pressure

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Damammel

Member
Nov 29, 2007
19
eastern CT
I would like to know if anyone has the actual math needed to figure head pressure. I have been through many of the threads but can't seem to find all the info needed. I am trying to determine if a Taco 011 pump is to big of a unit for my setup. The line running from the shed to the house starts with 1 1/4 black pipe in the shed about 15'. Then it is run through 1 1/4 pex for about 55 feet to 1 1/4 black pipe in the house 20'. After that is splits to two 3/4 copper lines about 10' with a filter on each line. From there it is piped into the boiler and pulls from the return lines for the hydronic heat. So it actually moves water through the boiler and up to the attic above the 2nd floor which must be about another 40'. The measurements are only in one direction so it would be doubled to add the return lines. Any help would be greatly appericated.

Thanks,
Derek
 
Pump "head" and pump "pressure" are two different things.

To give you all that info would take several pages of writing. Try doing a Google search.
 
Seach Taco's website. I know they have a quick and dirty guide to calculating which pumps make sense based on flow requirements, head requirements, etc. I wish I had the link....but I know it's out there....
 
It gets even worse.....

For any configuration of plumbing, head loss varies with flow rate - there's much more loss at high flow rates than at low rates.

Given a complete list of every component and fitting as well as the length, diameter, and material of each section of pipe it would be possible to calculate the head loss vs. flow rate curve, and from that (and the pump curves) you could get a sense of what flow the 011 or any other circulator would give you.

You could also connect a two-port pressure gauge across the circulator. From the pressure drop you can determine the flow rate that it's achieving.
 
Take a look at an online used book seller. Search for Cameron Hydraulic Data. The editor on my 18th edition is C.C. Heald. Buy a copy and it will cover everything you need to know (and a lot more that you dont need to know). Its an engineers reference book that Ingersol Rand pumps used to put out and is on a lot of engineers bookshelves. If that doesnt cover you, the Crane Flow of fluids technical paper 410 covers it in more detail.
 
damammel said:
I would like to know if anyone has the actual math needed to figure head pressure. I have been through many of the threads but can't seem to find all the info needed. I am trying to determine if a Taco 011 pump is to big of a unit for my setup. The line running from the shed to the house starts with 1 1/4 black pipe in the shed about 15'. Then it is run through 1 1/4 pex for about 55 feet to 1 1/4 black pipe in the house 20'. After that is splits to two 3/4 copper lines about 10' with a filter on each line. From there it is piped into the boiler and pulls from the return lines for the hydronic heat. So it actually moves water through the boiler and up to the attic above the 2nd floor which must be about another 40'. The measurements are only in one direction so it would be doubled to add the return lines. Any help would be greatly appericated.

Thanks,
Derek
Click to expand...

Might help..... https://www.hearth.com/econtent/index.php/forums/viewthread/33393/P0/
 
Thanks for the info. I will have to do some more research to find my best pump. I don't know if this or dealing with black pipe is the tougher part of the install. :) Otherwise the boiler is burning good. I have the storage tank heated now and working the bugs out of the heat to the house.
 
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