How many residents can run on a forty year old eight inch sewer line?

Hi NoxiousD:

Drain lines are determined by the number of FIXTURE UNITS.. not by residents or at least not by rsidential units as much as by how many toilets, sinks, dishwashers, washing machines, etc... are on it.

In a new installation with an 8" sewer pipe with 1/8" pitch per foot, in my area, you can fit up to 1600 fixture units. If 8" pipe has 1/4" pitch per foot you can increase that number to 1900 fixture units. Now, as pipe gets older that shouldn't change.. as long as pipe hasn't gotten clogged or damaged.

Toilet is 4 fixture units
Lavatory sink is 1 fixture unit
Shower stall is 2 fixture units
Tub/shower unit is 2 fixture units
Kitchen sink is 2 fixture units
Washing machine is 3 fixture units
Dishwasher is 1 fixture unit
Laundry sink is 2 fixture units

From there you can count up what the average house you are asking about has for fixture units and then multiply that number times the number of units in question to determine fixture units. As you can see... it will be a pretty high number... ;)

Also note that I have presented you with information from Massachusetts code book..so in your area it may differ slightly,but should differ by much. Just FYI!!

Let me know if need more here...

MARK

Mark answered your question. Now, why are you asking this question? Are you having problems with the existing sewer, or are you looking to add on to the complex?

Quote:

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Originally Posted by NoxiousD

How many residents can run on a forty year old eight inch sewer line?

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One building? How many units? How many bathrooms to a unit? Washer station? You want answers? We need details! Regards, Tom