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closely spaced tees
just thinking outside the box, would this be beneficial, working with a typical 150,000 btu boiler. instead of "just" going with the standard closely spaced tee's could I start the heating loop with 1-1/4 black pipe then go to a two inch x 1-1/4 reducing coupling then two - 2 inch x 1-1/4 tee , then back to a reducing coupling . then back to the boiler return in 1-1/4. what i want to do is get more volume and slow the water down. will that work?
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Comments
No real advantage to this unless your venting air or collecting magnetic particles etc
The distance between the tees is the key, and keeping that flow resistance as close to 0 as possible, adding additional diameter in the "tee" really has no advantage.
IF you are building a P/S like shown below with multiple circulators, and different capacity circs, then that "horseshoe" loop needs to be sized to the max flow rate when all circs are running. that horeshoe loop becomes a hydraulic separator of sorts assuring all pumps get adequate flow. The example tries to show different sized circulators to present the concept.
If you want to build a 4 port separator device, the key is to have the barrel size about 3 times the diameter of the connection ports. that assures the least amount of pressure drop, top to bottom, and assures both pumped circuits have adequate flow without conflicting.
trainer for Caleffi NA
The magic is in hydronics, and hydronics is in me
1 is there a minimum length after an elbow to place your closely spaced tees. ( like on an air scoop)
2 if I use black pipe to do my closely spaced tees. (1-1/4 pipe) can I use a shoulder nipple or do you want to go 4 x the pipe diameter in between the center of the tees.” 5 inches”
Doesn't matter if you pump into the P/S tee assembly, or out. Fig. 6-4 shows a high head loss boiler, you want to always pump "into" that type of boiler so the added pump head shows up at the boiler and assures the pressure switch is "made" Be mindful of expansion tank connection location, pump away always, it gets complicated in multi pump P/S piping. another reason to use a separator
Fig. 6-1 shows a cast boiler perhaps, a wide open vessel, not concern about the pressure drop in that boiler.
I don't know of a specific ironclad rule for P/S piping, this is a good rule of thumb below.
With threaded pipe I alway used a close nipple between the tees. Be sure the burr is reamed out, it really does make a difference at this special tee.
With any Caleffi drawing, the visual also tells a story. Thin lines vs fat lines, blue lines vs red lines, bright red, vs light red.
Mod con symbols vs cast boiler symbol. You can learn a lot about the intent of the drawing without reading the text. These drawings have been a big help we feel to convey the story.
There are installers out there that may not read or speak english. When I train in Chicago for example I often have a Polish and Spanish translator in the room
But always read the text
trainer for Caleffi NA
The magic is in hydronics, and hydronics is in me