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Octogenarian Marries Two Youngsters
Ironman
Member Posts: 7,429
This 100+ year old system was originally coal fired, gravity flow. Someone converted it to forced flow, gas fired with this beast 50+ years ago:
The old gal was still chugging along at 472k btus.
The new owners wisely decided that they needed something more efficient after a March natural gas bill of $1,000.
The load calc came to 195k btus with a design temp of 10*. More than enough for Staunton, VA where ACCA specs 14*. It's interesting that the EDR came to 227k btus and when I ran the load calc with a design temp of 0*, it came to 227k btus also. It was common many years ago to use 0* design temp around here. The dead men may have been a lot more scientific than we give them credit for.
We chose to go with two HTP UFT 120 boilers + a 40 gal. indirect. Because we were going with 2 boilers and we also wanted to protect the new boilers from rust and debris from the old system, we made our own LLH/dirt separator/MBR. Don't ask what's inside: it's top secret.
The old gal was still chugging along at 472k btus.
The new owners wisely decided that they needed something more efficient after a March natural gas bill of $1,000.
The load calc came to 195k btus with a design temp of 10*. More than enough for Staunton, VA where ACCA specs 14*. It's interesting that the EDR came to 227k btus and when I ran the load calc with a design temp of 0*, it came to 227k btus also. It was common many years ago to use 0* design temp around here. The dead men may have been a lot more scientific than we give them credit for.
We chose to go with two HTP UFT 120 boilers + a 40 gal. indirect. Because we were going with 2 boilers and we also wanted to protect the new boilers from rust and debris from the old system, we made our own LLH/dirt separator/MBR. Don't ask what's inside: it's top secret.
Bob Boan
You can choose to do what you want, but you cannot choose the consequences.
You can choose to do what you want, but you cannot choose the consequences.
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Comments
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Do you plan on installing a mag filter or treating the system w/ an inhibitor?0
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I love secrets:
Work looks great, even if mysterious...New England SteamWorks
Service, Installation, & Restoration of Steam Heating Systems
newenglandsteamworks.com1 -
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National US Radiator. We had one in the house I grew up in. Would have had coal snowman when built and in the 50s the gas boiler and pump was installed. Heated great. Split open a year after the gas valve stuck open and about blew the thing to the moon. I'm still amazed my Dad knew how to shut off the gas to it! In 1989 a WM HE was installed then the folks moved out.0
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@Ironman is that cell-core pvc for venting?Serving Northern Maine HVAC & Controls. I burn wood, it smells good!0
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Maybe for air inlet only?0
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Just on the intakes; the exhausts are schedule 40. I wondered how long it would be before someone asked that.Solid_Fuel_Man said:@Ironman is that cell-core pvc for venting?
Bob Boan
You can choose to do what you want, but you cannot choose the consequences.-1 -
I need some education please. I have always found that you do not screw copper into steel, when did it become OK to do that?
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It’s a closed system @cgdelzell, less of a concern. But I’m wondering about the bushings on the gas piping @Ironman? That’s allowed in your area?0
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I like it. But maybe you could just whisper to us the top secret bits, and no one else will be the wiser?New England SteamWorks
Service, Installation, & Restoration of Steam Heating Systems
newenglandsteamworks.com0 -
Seeing how Schedule 40 PVC can only handle 140 degrees I assume these boilers operate at a low water temperature?0
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The IFGC prohibits cast iron bushings, but the UPC allows them. Brass, steel and stainless bushings are okay according to the IFGC. That 1 1/4 X 3/4 bushing is the thickest fitting in the line. IDK why the IFGC still prohibits them. That would be a good question for @Tim McElwain .Danny Scully said:It’s a closed system @cgdelzell, less of a concern. But I’m wondering about the bushings on the gas piping @Ironman? That’s allowed in your area?
If you have a Honeywell replacement gas valve on your truck that says 1/2 X 3/4, you'll find a 3/4 X 1/2 bushing included.
PVC is rated for 149*, not 140. But the pipe manufacturer does not certify it for appliance venting, the APPLIANCE manufacturer does that. HTP certifies PVC venting for that boiler as long as the included CPVC nipple is used. The boiler has a flue temp sensor which limits flue gas temp to 145* inside the boiler. Keep in mind that flue gas temps drop quickly as they move down the pipe.captainco said:Seeing how Schedule 40 PVC can only handle 140 degrees I assume these boilers operate at a low water temperature?
Bob Boan
You can choose to do what you want, but you cannot choose the consequences.0 -
Maybe a little down the road.New England SteamWorks said:I like it. But maybe you could just whisper to us the top secret bits, and no one else will be the wiser?
Bob Boan
You can choose to do what you want, but you cannot choose the consequences.1 -
Dressed up a little:
Bob Boan
You can choose to do what you want, but you cannot choose the consequences.0 -
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Soon. I may be able to tell one of the ingredients soon. We're still testing.Bob Boan
You can choose to do what you want, but you cannot choose the consequences.0 -
I'll guess 1/4" steel mesh formed into a roll0
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I'm guessing some stainless steel wool....and some type of magnet in there.....Serving Northern Maine HVAC & Controls. I burn wood, it smells good!0
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I have done both on a couple of my prefabbed headers...0
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