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I am curious about the foil tape on the single wall vent pipe. Is that a requirement in your jurisdiction? I have never seen that as a requirement. The vent for a Catagory 1 appliance is under negative pressure. The IFGC has very little information on installation requirements of single wall "vent" pipe. Very little on specifics as to how sections of single wall vent pipe are to be fastened together, sealed, supported. I am an oldtimer, and we always used at least 3 screws in each joint of single wall vent pipe. Never used tape. Anybody have jurisdiction requirements that go farther than screws in each joint? Such as how often the vent must be supported horizontally? For instance IFGC Chapter 5 vents says All portions of single wall metal pipe shall be supported for the design and weight of the material supported. That leaves a lot up to the discretion of the AHJ.
I was talking about a bracket for the expansion tank. None required
 

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I am curious about the foil tape on the single wall vent pipe. Is that a requirement in your jurisdiction? I have never seen that as a requirement. The vent for a Catagory 1 appliance is under negative pressure. The IFGC has very little information on installation requirements of single wall "vent" pipe. Very little on specifics as to how sections of single wall vent pipe are to be fastened together, sealed, supported. I am an oldtimer, and we always used at least 3 screws in each joint of single wall vent pipe. Never used tape. Anybody have jurisdiction requirements that go farther than screws in each joint? Such as how often the vent must be supported horizontally? For instance IFGC Chapter 5 vents says All portions of single wall metal pipe shall be supported for the design and weight of the material supported. That leaves a lot up to the discretion of the AHJ.
Yep, 3 screws per joint. When people use foil tape on the joints they’re usually trying to hide something.
 

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Yep, 3 screws per joint. When people use foil tape on the joints they’re usually trying to hide something.
Not if they squeegee the tape down well, then it's just going the extra, unneccesary mile.
 

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I Like Tater Tots
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Discussion Starter · #47 ·
That was an existing vent that was reused. It is not a requirement or a necessity in our area.

I am curious about the foil tape on the single wall vent pipe. Is that a requirement in your jurisdiction? I have never seen that as a requirement. The vent for a Catagory 1 appliance is under negative pressure. The IFGC has very little information on installation requirements of single wall "vent" pipe. Very little on specifics as to how sections of single wall vent pipe are to be fastened together, sealed, supported. I am an oldtimer, and we always used at least 3 screws in each joint of single wall vent pipe. Never used tape. Anybody have jurisdiction requirements that go farther than screws in each joint? Such as how often the vent must be supported horizontally? For instance IFGC Chapter 5 vents says All portions of single wall metal pipe shall be supported for the design and weight of the material supported. That leaves a lot up to the discretion of the AHJ.
 
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@dhal22
I would guess nothing prohibits an isolation or drain valve no matter how unnecessary.
Most if not all codes forbid a valve that can isolate a safety device from the system it's protecting.
 

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Most if not all codes forbid a valve that can isolate a safety device from the system it's protecting.
Can you tell me what code numbers that’s in the model codes under ?

I’ve never read that in the model codes. I’m sure some jurisdictions may have it amended into the code but that wouldn’t qualify as most.
 

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Can you tell me what code numbers that’s in the model codes under ?

I’ve never read that in the model codes. I’m sure some jurisdictions may have it amended into the code but that wouldn’t qualify as most.
Aren't you in Alabama?
 

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I’ve never read in a code book that a thermal expansion tank is required, I’ve always read that thermal expansion control must be provided for.
The city code I work under doesn’t require thermal expansion control unless the system is normally closed by a any type of check valve.

There are more than just expansion tanks for the control of thermal expansion.

There are ballcocks and hose Bibb adapters that provide protection against thermal expansion. Of course the toilet would have a stop valve that could isolate the thermal expansion from the system.
 

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I’ve never read in a code book that a thermal expansion tank is required, I’ve always read that thermal expansion control must be provided for.
The city code I work under doesn’t require thermal expansion control unless the system is normally closed by a any type of check valve.

There are more than just expansion tanks for the control of thermal expansion.

There are ballcocks and hose Bibb adapters that provide protection against thermal expansion. Of course the toilet would have a stop valve that could isolate the thermal expansion from the system.

They're only required here on commercial projects. That or a pressure relief valve on the backflow.
 

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Can you tell me what code numbers that’s in the model codes under ?

I’ve never read that in the model codes. I’m sure some jurisdictions may have it amended into the code but that wouldn’t qualify as most.
In My Opinion, this code requires a valve at the expansion tank. See 7. Also, I find the code commentary books very helpfull for guidance and interpretation. Every contractor in the trades can benefit from the understanding that comes from reading the code commentary books. You would be armed with a book that can aide you in the event you come up against an inspector that may have a missinterpretation of the code. They are available in softback versions that can be kept on your truck.
606.1 Location of Full-Open Valves

Full-open valves shall be installed in the following locations:
  1. On the building water service pipe from the public water supply near the curb.
  2. On the water distribution supply pipe at the entrance into the structure.
  3. On the discharge side of every water meter.
  4. On the base of every water riser pipe in occupancies other than multiple-family residential occupancies that are two stories or less in height and in one- and two-family residential occupancies.
  5. On the top of every water down-feed pipe in occupancies other than one- and two-family residential occupancies.
  6. On the entrance to every water supply pipe to a dwelling unit, except where supplying a single fixture equipped with individual stops.
  7. On the water supply pipe to a gravity or pressurized water tank.
  8. On the water supply pipe to every water heater.
 

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In My Opinion, this code requires a valve at the expansion tank. See 7.
606.1 Location of Full-Open Valves

Full-open valves shall be installed in the following locations:
  1. On the building water service pipe from the public water supply near the curb.
  2. On the water distribution supply pipe at the entrance into the structure.
  3. On the discharge side of every water meter.
  4. On the base of every water riser pipe in occupancies other than multiple-family residential occupancies that are two stories or less in height and in one- and two-family residential occupancies.
  5. On the top of every water down-feed pipe in occupancies other than one- and two-family residential occupancies.
  6. On the entrance to every water supply pipe to a dwelling unit, except where supplying a single fixture equipped with individual stops.
  7. On the water supply pipe to a gravity or pressurized water tank.
  8. On the water supply pipe to every water heater.
What code would that be ?

But the statement you quoted by me was in the context of a code NOT prohibiting a valve between the expansion tank and the source of expansion.

You posted a code that says a valve shall be installed. Ok that’s fine..👍

Read the quoted part of post #50 and then read my response.
 

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What code would that be ?

But the statement you quoted by me was in the context of a code NOT prohibiting a valve between the expansion tank and the source of expansion.

You posted a code that says a valve shall be installed. Ok that’s fine..👍

Read the quoted part of post #50 and then read my response.
The thermal expansion tank is not a relief valve. Valves are not to be installed between a water heater and its relief valve. I do not see anywhere that prohibits a valve between the thermal expansion tank and the water heater, or any code prohibiting an installation of a valve at the thermal expansion tank. The expansion tank can be installed anywhere on the cold water distribution piping that suppies cold water to the tank water heater downstream from a pressure reducing valve or check valve. I think we are in agreement.
 
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