Maintaining a Septic System_copy
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The kitchen sink drain line was of two inch diameter ABS pipe material, running in excess of thirty feet. For the length of the pipe, alone, it is not surprising he was having a clogged kitchen sink drain. When the run to the stack, or main sewer line is this long, the grade on the pipe is usually compromised. The International Plumbing Code requires the pitch of the pipe to fall 1/4" per foot of horizontal travel. The pipe runs in a ceiling which is usually made a distance of no more than 8" from the sub-floor above, due to the size of joist supporting the floor above the ceiling. The pipe may not penetrate the joist 2" from the top or 2" from the bottom of the joist.
Since the top of the two inch pipe is set at no closer than two inches to the top of the floor joist, the bottom of a 2" pipe is resting at 4" from the top of the joist. So, plumbers attempt to have the last few feet of pipe running along side the joist to prevent being restricted by penetration codes. This would mean the bottom of the 2" pipe can rest at bottom (or ceiling side) of the joist after running a distance of 16 feet. The 2" drain line running a distance of 30 feet was flat at some points and back pitched. A plumbing inspector should never had permitted the design of the plumbing system to have 2" pipe running more than 16 feet, according to The International Plumbing Code.
When a long length of pipe, carrying debris from the kitchen sink drain line has little fall, or is back pitched, the debris lays in the pipe until it accumulates and builds a blockage. The water attempting to flow down is not enough to remove the blockage because the debris, building over time hardens. Now, there is little the home owner can do, but cable the line. Chemical drain cleaners will not have an effect on the drain.