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 MA Plumbing Code - Min Offset
Author: ravalhardikm (MA)

Hello All,

I work in a municipality and have a quick question to those with the knowledge of Plumbing Code (Preferably Massachusetts).

Is there a requirement about minimum offset from the lowest house plumbing fixture to the town sewer main? The link below contains a hand drawn image which should explain my question in detail.


[picasaweb.google.com]


We are thinking of incorporating that into our sewer design standards. Any input is appreciated.


Thanks

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 Re: MA Plumbing Code - Min Offset
Author: packy (MA)

in massachusetts, plumbers are responsible for the pipes for a distance of 10 feet beyond the foundation wall. after that, a licensed sewer contractor takes over.
for that reason, i don't believe the plumbing code addresses that issue.

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 Re: MA Plumbing Code - Min Offset
Author: jimmy-o (CA)

And the op describes himself as a "sewer engineer" ( on another forum ) so I would think he should know the answer!!!!!

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 Re: MA Plumbing Code - Min Offset
Author: hj (AZ)

There is no way that requirement could be enforced. To do so would automatically, require an entire residence to be elevated if the lot's surface, which normally establishes the height of the connections to it, were below what the ordinance would require. The closest thing that comes to it, is the requirement that if the plumbing is lower than the rim of an upstream manhole, then a backwater valve is required.

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 Re: MA Plumbing Code - Min Offset
Author: hj (AZ)

Here the plumber is responsible for the sewer to the properly line.

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 Re: MA Plumbing Code - Min Offset
Author: Nayman's Drain Services (Non-US)

Plumber is responsible for point where drain turns into sewer. (1 meter/3 feet)

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 Re: MA Plumbing Code - Min Offset
Author: LemonPlumber (FL)

developed but length less 18"max foot per foot,?Do you mean uphill?4 inch at or near 1/16 per foot is greater than needed so if Mas. would not except it ,the state is second.,Minus a vent .You showed a wall to enclose a fixture.with out a three inch vent.Would never have time spent.If the fixture alone could be dropped indirectly out side only the full size trap .Freeze is not really covered!Sorry have no real mass. experience.You need a vent.maybe more than that.Maybe by exception less.mass plumbers are always watching!



Edited 1 times.

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 Re: MA Plumbing Code - Min Offset
Author: Nayman's Drain Services (Non-US)

hey Lemon,
wanna translate so we can understand?
I'd like to know the answer too, but it don't make sense in rhyme

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 Re: MA Plumbing Code - Min Offset
Author: hj (AZ)

Lemon, you do not even understand the original question. It had NOTHING to do with the piping inside the building, vents, or anything else. 1/16" pitch is ONLY allowed for 6" and larger, unless it has a mechanical engineer's design and approval stamp.

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 Re: MA Plumbing Code - Min Offset
Author: ravalhardikm (MA)

Thanks Lemon but this is a generic drawing that I scribbled just for this question. I understand the need for a vent etc. But my concern is different.

If the lowest fixture does not have enough slop to the main then any backup in main would cause sewer backup in the house. We are concerned that if such backups arise then the town will be held responsible for allowing such fixtures. So I want to know if there is any standard/rule in the plumbing code which addresses this.

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 Re: MA Plumbing Code - Min Offset
Author: ravalhardikm (MA)

Packy, I don't think you understand the question. This has nothing to do with the pipe slope and who takes what responsibility. It is about the lowest a fixture can be installed in comparison with the sewer main.



Edited 1 times.

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 Re: MA Plumbing Code - Min Offset
Author: ravalhardikm (MA)

thanks jimmy-o, great answer, just what I was looking for. BTW I have not described myself as "sewer engineer" any where.

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 Re: MA Plumbing Code - Min Offset
Author: jimmy-o (CA)

Nothing was intended to offend....but apparently this is someone else by the same name, who asked the same question:

About ravalhardikm
How did you find @#$%&?
google search
What is your Plumbing related field/trade:
Sewer Engineer

Post Reply

 Re: MA Plumbing Code - Min Offset
Author: hj (AZ)

quote; If the lowest fixture does not have enough slope to the main then any backup in main would cause sewer backup in the house.

Again, that is a function of how high the HOUSE is above the main, since the fixtures are set in place inside it. The common answer is that any fixture BELOW the main requires a sewage pump. and if the relative elevation of the upstream manhole, which is what determines the "flood level" for that building, is such that the structure is lower than that, then a backwater valve, or other flood control, is required, or is at least advisable, inside the building. Your question is flawed, because the elevation of fixtures in the house AT the point of connection, has nothing to do with the possibility of the building flooding during a backflow, or overloaded, condition. The sewers will "back up" until they find a "relief" point which is normally the lowest manhole rim above the flooded section.

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 Re: MA Plumbing Code - Min Offset
Author: LemonPlumber (FL)

Any failure understood, could not be plumbed to!Indirect is the installed only protect.Any other would be reject.Back fall at a city tap is not their problem/until you report it!!!!!.you could only ask to correct.The post seems to wonder, as I am now.Is the city sewer at or in your house? Suspect that you need to know.where your sewerage ends and the cities show,s.Sorry .

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 Re: MA Plumbing Code - Min Offset
Author: LemonPlumber (FL)

Nayman,Here we,ll also run the buildings sewer.Responsible for that to a city tap often thirty meters instead.To the city tap we go.but from the start you must know!Is it the city or yours.Fall as set is just downward and as little as installing can get.Knowing why will make the average inspector die!Indirect done correctly will make them sigh.Frost baffled receivers .I don,t want to try.

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