Indirect drain for boiler ? - Plumbing Zone

dkonrai · 11-26-2019, 08:44 PM

Long story short.
Roof top boiler. Mechanical guy had to relocate about 50 feet from plan.
Boiler, and closed loop has 3/4 inch relief valves.
Boiler drain is 1 1/4.
Is it better to run a 2 inch line, 90 up to a receptacle? Or run seperate, boiler drain, boiler relief, closed loop relief?
Per plan I have installed a roof receptacle that has a 2 inch dam, and a 3/4 make up protected by a rpbfp.
Or run all seperate lines?
Never run into a situation like this in all my years.
Thanks in advance.

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**GAN** · 12-02-2019, 08:46 AM

Wow. First take a step back. If you installed per the "Approved Drawings", I would not alter it without a "Licensed Design Professional" (Architect or Engineer). Most locations an alteration without an approved change of work order leaves you in a position you don't want to be in.

If no drawings were provided and this is an as-built situation, there is still a question. For instance if this was just a swap out form an old to new unit (without a set of drawings) you have more leeway. To me in (Illinois) a condensate type drain is not required to terminate into a receptor on a roof. It can discharge on a roof and evaporate or run to scuppers. Since your looking at a temp issue, you need a receptor to deal with heat.

I would cut into the roof an install a floor sink, trap & vent it next to the unit. Then run all indirect into it. You mention an R.P.Z., not knowing you location. We are mandated to install those not more than 5" AFF, unless there is a walkway and discharge the relief onto a floor (providing a FD is in the same area) or indirect into a receptor.

Not knowing you area installing on outside I hope your not in an area subject to freezing, unless you utilize a hot box. Or install within the building mech room and run the line clearly marked non-potable water.

dkonrai · 12-14-2019, 12:37 AM

Ok done.
We moved the drain closer to the boiler.
Located in California, bayarea.
I passed inspection guess that's all that matters?

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MASTRPLUMB · 12-14-2019, 12:52 AM

Great looking work !

skoronesa · 12-14-2019, 07:50 AM

In that last picture, couldn't you have had all those copper legs come over to the boiler pad at the same height? If they all came over just above the pad you could have done one more piece of unistrut with some clamps. That one inch line looks like 6'+ of unsupported pipe.

Is there enough room between those pipes for a pipe cutter or will the next guy be swearing at you?

Will you be insulating all this?

.

11-26-2019, 08:44 PM	#1
dkonrai Junior Member Join Date: Oct 2019 Posts: 28 My Photos	Indirect drain for boiler ? Long story short. Roof top boiler. Mechanical guy had to relocate about 50 feet from plan. Boiler, and closed loop has 3/4 inch relief valves. Boiler drain is 1 1/4. Is it better to run a 2 inch line, 90 up to a receptacle? Or run seperate, boiler drain, boiler relief, closed loop relief? Per plan I have installed a roof receptacle that has a 2 inch dam, and a 3/4 make up protected by a rpbfp. Or run all seperate lines? Never run into a situation like this in all my years. Thanks in advance. Sent from my moto g(7) using Tapatalk skoronesa and MASTRPLUMB like this.

12-02-2019, 08:46 AM	#2
GAN Super Moderator Join Date: Jul 2012 Location: St. Louis Metro Posts: 2,023 My Photos	Wow. First take a step back. If you installed per the "Approved Drawings", I would not alter it without a "Licensed Design Professional" (Architect or Engineer). Most locations an alteration without an approved change of work order leaves you in a position you don't want to be in. If no drawings were provided and this is an as-built situation, there is still a question. For instance if this was just a swap out form an old to new unit (without a set of drawings) you have more leeway. To me in (Illinois) a condensate type drain is not required to terminate into a receptor on a roof. It can discharge on a roof and evaporate or run to scuppers. Since your looking at a temp issue, you need a receptor to deal with heat. I would cut into the roof an install a floor sink, trap & vent it next to the unit. Then run all indirect into it. You mention an R.P.Z., not knowing you location. We are mandated to install those not more than 5" AFF, unless there is a walkway and discharge the relief onto a floor (providing a FD is in the same area) or indirect into a receptor. Not knowing you area installing on outside I hope your not in an area subject to freezing, unless you utilize a hot box. Or install within the building mech room and run the line clearly marked non-potable water. ShtRnsdownhill, Tango and MASTRPLUMB like this. __________________ Il. Lic.# 058-106725, Il. C.C.D.I. Lic. # XCO396 Remember valor, honor, independence, family & clan; I do whenever I hear the ceol mor, the "great music" of the Highland bagpipe. I swear upon the holy iron of my dirk that I will not forget.

12-14-2019, 12:37 AM	#3
dkonrai Junior Member Join Date: Oct 2019 Posts: 28 My Photos	Ok done. We moved the drain closer to the boiler. Located in California, bayarea. I passed inspection guess that's all that matters? Sent from my moto g(7) using Tapatalk skoronesa likes this.

12-14-2019, 07:50 AM	#5
skoronesa Senior Member Join Date: Oct 2015 Location: East Bumfuk, Mississippi Posts: 3,244 My Photos	In that last picture, couldn't you have had all those copper legs come over to the boiler pad at the same height? If they all came over just above the pad you could have done one more piece of unistrut with some clamps. That one inch line looks like 6'+ of unsupported pipe. Is there enough room between those pipes for a pipe cutter or will the next guy be swearing at you? Will you be insulating all this? . MASTRPLUMB likes this. __________________ Want privacy from the diy/hacks? Too bad, the motherland has fallen, freedom is dead. "I'd rather have Questions that can't be answered, than Answers that can't be questioned"

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12-14-2019, 12:52 AM	#4
MASTRPLUMB Senior Member Join Date: Mar 2019 Posts: 124 My Photos	Great looking work !