- This topic has 2 replies, 3 voices, and was last updated 22 years, 7 months ago by
SylvanLMP.
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MasterPlumbers
need specs and sewer line detail. to replace existing sewer line under concrete slab. backfill material and trench detail.
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Tony ,can I ask what you do for a living?
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In reply to message posted by [email protected]:
need specs and sewer line detail. to replace existing sewer line under concrete slab. backfill material and trench detail.
I would Use
Extra heavy cast Iron UN COATED laid in clean fill with a 1/4″ per ft pitch hydrostatically tested with a 10 ft head of water left for 24 hours without a drop of water or pressure.
All piping passing under a foundation wall shall be protected from carrying any structural weight by an arch lentil or Iron pipe sleeve.
The annular opening of this sleeve shall be made gas and water tight to protrect the building Occupants from dangerious sewer gases.
A clean out shall be placed every 50 ft or every change of direction greater then 45 degrees.
No 1/4 bends shall be used on sanitary or soil lines. Only 1/8 bends or long sweeps or 1/16 or 1/32 bends ( 11/1/4 22/1/2 , 45 or 60 )
If this is a combination system by use of interpolation you can size this piping by either fixture units (7.48 gallons per unit) Or you can use square feet of roof and area drains with properly vented sanitary lines and a fresh air inlet.
On interpolation get a ten year frequency report as over loading the system is punishable by a huge fine.
The F A I shall be 6″ or more above grade and shall be half the size of the building house trap BUT in no case less the 3″
The vent terminal for this should be 4″ to prevent hoarfrost and if this is a promenade deck then the vent shall terminate 7 feet above grade.
The lead in the hub of the cast Iron when caulked shall not depress more then 1/8 per inch and be filled with clean virgin lead 1″ depth and figuring 1 pound per inch of piping diameter.
The connection to the main public sewer must be above the crown weir and at a right angle to the existing flow
Will you have the need for a back water valve or any provisions for ground water infiltration?
There are a lot more stupid technical stuff involved BUT considering you have to know it as you would never attempt to do ILLEGAL plumbing activity by not having the proper licensing or training.
You Knowing the crushing strength of the material is a given.
If you don’t own a joint runner you may get over with push gaskets or MJ couplings.
It is a great idea to protect piping with HOT applied coal tar enamel using 15# felt used with a dauber brush and a large enough kettle to make sure you do not run out of hot.
You do know the lead for the caulked joint has to be poured in one pouring correct?
Considering I do write codes for some agencies and am a Certified low pressure boiler and unfired pressure vessel inspector and a code instructor YOU can contact me directly to write your specifications when you send me a deposit and your local code book where I will make the necessary corrections to make sure your work far exceeds your local country bumpkin plumbing standards.
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