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Member Posts: 6,928
What type of pipe/tube?

As Brad mentioned the "equivalent length" method is MUCH easier to use and very reasonably accurate at the general velocities in hydronic systems.

You can find them on the web. Try Google. Include "equivalent length" QUOTED in your search string along with the type of pipe/tube.

www.copper.org has tables for copper tube & fittings but there's so much there that things can be a bit difficult to find.

• Member Posts: 312
Taco 008

I'm curious to know what the flow rate of the 008 is. But I dont understand the total head-feet rating?

When I look at the GPM flow curves provided by Taco, flow increases as the 'head' decreases. I presume 'head' is pressure drop in the pipe circuit, correct? (pipe size, length and number of elbows)
• Member Posts: 1,243
That's right

The longer the straw, the harder it is to blow through it.

• Member Posts: 312
Standards

Alan,

Thanks.

Are there standard pressure drop ratings available for pipe diameter, length and 90 and 45 elbows? If I had that, i could then add up everyhting in the circuit.
• Member Posts: 2,440
Fitting Losses Depend

on pipe size and velocity. A simple way is to assign each fitting a value equal to it's "equivalent feet of pipe" to which is added the actual straight pipe itself. The total equivalent feet or TEL is then multiplied by the pressure drop factor ("feet of head loss per 100 feet of pipe") for the given flow rate.

If you want, e-mail me off line and I will give you a copy of a spreadsheet I developed that does just that.

• Member Posts: 94

The Taco 008 has a relatively steep curve, and is a good candidate for systems requiring flow through long lengths of piping. Hope I didn't over simplify this, if you have specific questions I will be happy to answer them for you.
Joe Mattiello
Technical Support Technician
Tel. 401-942-8000 X 484
Fax. 401-942-2360
1160 Cranston St
Cranston, RI 02920
[email protected]
• Member Posts: 312
Great

The spreadsheet would very much appreciated! I'm sorry though, I misplaced your email and I know you scramble it to avoid spamers. If you can, send me the file to my address. I believe mine displays in the forum? I have it checked in my options page. On second thought, here it is -lol.

[email protected]
• Member Posts: 312
Actual circuit measurement

Joe,

Thanks. I dont think I have specific questions on the pump itself right now. What Im looking to do for now is measure the circuits this pump is feeding so I know what the flow is to the DHW tank and the two water coils. If I know that, plus water temps in and out and CFM flow over the coils I'll be certain the system components are sized correctly. Or completely frustrated if they are not ).
• Member Posts: 128

As a HO, I've found the following Taco resources very useful for TEL calculations, pump selection (particularly in zone valve systems), etc.

• Member Posts: 312
Duh. I just realized email shows in the reply page

OK, I do in fact have your email ).
• Member Posts: 312
Hey Mike

Well the circuit to the DHW is 1" copper and the lines to the water coils are 3/4" PEX.
• Member Posts: 312
Hey Mike

The primary loop is 1 1/4" black pipe, the circuit to the indirect is 1" copper and the lines to the water coils are 3/4" PEX.

Thanks for those other info sources. Ill check them out.

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