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Old 05-16-2020, 08:22 AM   #21
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Quote:
Originally Posted by ironandfire View Post
Yes ! It's always bugged me that nobody has a clear understanding of how to interpret a set of plans. My thought is that plans are theory and not gospel . Some guys seem to see it the other way around. I don't know how many times I've heard " Put it in just like it shows".
Case in point. Combination waste and vent for a sink. You'll never see that on a set of plans.
most plumbing plans are NOT drawn up by a licensed plumber but some hack engineer or architect that just goes with a cad program, I have seen many times they spec for an 1 1/4 inch vent..WTF there are no DWV pipes that are 1 1/4 inch unless you go with copper and thats not code...

usually for commercial you follow where the pipes go because other trades have their specified spot to run their utilities so everything fits where it should...or thats the plan....
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Old 05-16-2020, 09:21 AM   #22
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A combination waste and vent is too specialized for the engineer to illustrate even though it's an engineered venting system. Too much detail for a set of plans. I would assume they're just illustrating a simple theory that a fixture needs to be vented.
Specs on the other hand offer a level of detail the plans don't. And never really are specific on venting options (which should give me, as a professional, the option to do whatever).
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Old 05-16-2020, 09:25 AM   #23
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The owner has a specific request; "No 3/8" rod".
O.k. , I'd be more than happy to your drinking fountain supply with that material.
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Old 05-16-2020, 06:00 PM   #24
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I did a re-model years ago on a condo. The condo was up on the 12th floor. The owner moved some fixtures around in addition to replacing fixtures.

When I was working on the kitchen sink, I noticed that the cast iron stack was 5". That was new to me. That 5" stack was both the vent & drain for the condo kitchen sink.

With other commercial jobs that I was on, there were {2} separate lines for the fixtures. One was a dedicated vent that went up through the roof, and the other line was a dedicated drain line. A perfect example is carrier systems.

But with the condo re-model that I mentioned earlier, the only line for both the vent and the waste was this vertical 5" cast iron. That is a combination waste & vent. The plumbing code requires a few things, like the stack cant reduce in size; it has to remain the same size all the way up through the roof, no water closets can dump into it {neither can urinals}, it can't offset, and it has to be over-sized. Over-sized in the sense that if you add up the DFU's for the stack, the code would allow maybe a 3" vertical stack, but since this will be a combination waste & vent, the code requires the vertical stack to be 5".

It's been a while since I've done anything commercial, now a days I just do small residential stuff.

I am checking my code book and what I am describing is called "Waste stack vent" in my code. Section 910.

I know it as a combination waste & vent. I forgot that offsets are allowed but only above the last fixture. That is called the stack vent. That section can have offsets, but has to be the same size as the entire stack's diameter.

Any of you guys who do a lot of commercial, feel free to jump in.
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Old 05-16-2020, 06:05 PM   #25
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In Pennsylvania, I think they call that a Philly single stack. Don't know if Pa. is I. P. C.
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Old 05-16-2020, 07:07 PM   #26
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Quote:
Originally Posted by Tommy plumber View Post
I did a re-model years ago on a condo. The condo was up on the 12th floor. The owner moved some fixtures around in addition to replacing fixtures.

When I was working on the kitchen sink, I noticed that the cast iron stack was 5". That was new to me. That 5" stack was both the vent & drain for the condo kitchen sink.

With other commercial jobs that I was on, there were {2} separate lines for the fixtures. One was a dedicated vent that went up through the roof, and the other line was a dedicated drain line. A perfect example is carrier systems.

But with the condo re-model that I mentioned earlier, the only line for both the vent and the waste was this vertical 5" cast iron. That is a combination waste & vent. The plumbing code requires a few things, like the stack cant reduce in size; it has to remain the same size all the way up through the roof, no water closets can dump into it {neither can urinals}, it can't offset, and it has to be over-sized. Over-sized in the sense that if you add up the DFU's for the stack, the code would allow maybe a 3" vertical stack, but since this will be a combination waste & vent, the code requires the vertical stack to be 5".

It's been a while since I've done anything commercial, now a days I just do small residential stuff.

I am checking my code book and what I am describing is called "Waste stack vent" in my code. Section 910.

I know it as a combination waste & vent. I forgot that offsets are allowed but only above the last fixture. That is called the stack vent. That section can have offsets, but has to be the same size as the entire stack's diameter.

Any of you guys who do a lot of commercial, feel free to jump in.

That might have been a sovent system.

Iíll admit I donít know all the codes around the country, but I donít think a combo waste/vent can be used on multiple levels.
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Old 06-09-2020, 07:54 PM   #27
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To use a combo wv system (around here anyway) the pipe usually has be over sized (I don't remember right now how much per fixture unit; I'm not going to look it up right now) and graded as per the spec of the size in the code book. Its been a few years. My old company liked to use them on floor drains and floor sinks, in particular floor sinks in the middle of a grocery store for condensate drains for the freezers and refrigerators because there is a lot of distance to run a vent for a floor sink between a floor sink in the middle of a store and the wall.

They work fine, but they are almost ALWAYS a fight with the inspector.
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