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capacity of 1 1/4 pipe to displace air in a radiator
misterheat
Member Posts: 158
Good morning all, recently i have added a radiator to the end of a run that feeds 3 radiators . The first 2 rads are fed by 1 1/2 pipe and after the second tee it reduces to 1 1/4 (why they did it this way is beyond me .Its very old piping ) The last radiator is big for a big room and it replaced a smaller one which was not quite heating the room properly . Since the change to the new bigger rad ,it is only heating the first 3 sections of the rad during the long calls for heat in the morning after a 3 degree set back . I m still under my sq ft (386) for my IN5 boiler . The new rad is 5 tube 25 high 16 sections its a big rad for a big big drafty room . Have i exceded my capacity to displace the air in this new rad ?? It has a heat timer vari valve open all the way on it . Because this is basically the end of the run (main ) . * This is a branch and not the official main . The main that runs directly off the boiler is 2 inch . I will get some pictures up soon to help .Thanks
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It has nothing to do with "ability to displace air". All that was changed was the radiator? No changes to the runout ? Is that runout pitched correctly? Is the upfeed from the main to the runout branch piped using a 45 or a 90? Does that 1-1/4" to the last radiator feed anything else? That new radiator looks to be about 65sq.ft EDR if it's a column type and not a tube type. Is the 1-1/4" pipe a "main"? Is so, that's a problem. Mains shouldn't be less than 2". Pics will help.1
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Another thing to keep in mind with a bigger rad. A bigger rad has the capacity to heat more, but it won't heat more than the amount of steam getting to it. If you had say a 10 section rad there before and the first 3 sections got hot when the thermostat called for heat and you replace that with a 16 section rad it will still only heat the first 3 sections. This is with all things being equal, same vent same pipe etc. Also each pipe size has an EDR capacity it is capable of delivering. I suspect as was already eluded to the piping may not be adequate for what you are trying to do.1
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SO the pipes in question are the one that goes toward the back wall . the one with the drip pipe it goes around the corner . the first 2 rads are 1 1/2 than i included a picture of the 2nd rad tee and as u see reduces to 1 1/4 and then goes to the last rad. SO starting at the 1 1/4 tee it runs straight 7 feet 90s into 5 feet of 1/14 and then turns 90 up thru floor to valve0
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its a tube style rad .pitches look good.i guess its considered a main but it end in a radiator0
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We could use a picture or two of the new radiator showing it's valve and vent.
Also, how was that boiler skimmed? I don't see a skim port?Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
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The radiator is actually 48 sqft. The runout to it should be 1-1/2, and the "main" itself should be 2", or dripped somehow. Hopefully we can accomplish heating this radiator with a better venting approach (for now).0
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I have a 60sqft radiator on a 1 1/4" runout and it works perfectly fine. I also have another 50sqft on a separate 1 1/4" runout that is around 10 feet long and it also works fine.
Why should this specific one be 1 1/2" and not 1 1/4 for a 48sqft rad? Not able to get proper pitch?Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
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Any runout over 8 feet should be up sized. Im suggesting that on paper, it should be 1-1/2, but as you've exemplified, sometimes things can still work perfectly fine when they're wrong on paper. That's why our 1st approach will be venting.0
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Ah.Danny Scully said:Any runout over 8 feet should be up sized. Im suggesting that on paper, it should be 1-1/2, but as you've exemplified, sometimes things can still work perfectly fine when they're wrong on paper. That's why our 1st approach will be venting.
I was remembering what Abracadabra had also mentioned, and that was TLAOSH stated 55sqft was the limit. I didn't realize that was only for up to 8 feet.
One of mine is only 2 feet long, but the other is at least 10. It has good pitch and I keep my pressure really low so maybe that's why it works.Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
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Try reducing the venting on the first 2 radiators.0
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Steam will take the path of least resistance, simple as that0
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In the picture "boiler3", does that horizontal pipe slope back toward the boiler, or the other way?All Steamed Up, Inc.
Towson, MD, USA
Steam, Vapor & Hot-Water Heating Specialists
Oil & Gas Burner Service
Consulting0 -
That's the pipe I suggested a couple months ago needed to be pitched. It's a return. He says it is pretty much level. I think he said he would address that when the weather breaks.Steamhead said:In the picture "boiler3", does that horizontal pipe slope back toward the boiler, or the other way?
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