Simple question on blockages.

[jdwx]

under the basement floor horizontal pipe A meets horizontal pipe B at a 90-110 degree angle. they are merged and sewage proceeds from this point down a single pipe (125-135 angle from each A & B) and out of the building.

Pipes are cast iron. This is the original design approved by the city.

pipe A is equal or has a smaller diameter than pipe B.

is it possible that a damaged pipe A can cause a blockage in either pipe B or the single line that proceeds from this merge point.

Me and my condo association are in disagreement on this. A simple No or if it is a Yes, please state how?

 

[frodo]

simple as i can get

your drawing shows a double wye. , not a good fitting to use, it has to be level for both sides to be level, level in a sweer is not good
if one side has fall than the other side will have back fall, also not good

you also stated in an earlier post about the same line. one of them is the kitchen.
kitchens are notorious for grease clogs, when some yahoo pours anything into it besides water


take a level line, add grease, you have a clog,,i am not saying that is your problem,

you said the line was videoed. BOTH lines or just the main ?



add,,,,also, i see one line is smaller than the pther, that means a reducer has been used
that is another place where grease piles up.

 

[jdwx]

line A is a kitchen line. line B is bathroom. this was put down when the house was built in 1924 line A may be smaller, i do not know what was standard back then for kitchen lines compared to bathroom lines.
the clog is not due to build up of the bathroom line or the single line that proceeds to the front and out the building. these 2 were videod.

yes, line A may have some build up.

 

[frodo]

abandon the kitchen line and pipe sewer over head basement


good idea to pipe the bathroom over head also.

the pipe was installed in the 20's.

 

[jdwx]

i am sure that you are giving good advice. if we decide to overhaul the entire system, overhead is probably best.

you observed the fault in using a double wye. that is a problem for all pipes in the pic, not just pipe A, unless removing pipe A would resolve that issue for the remaining pipes.

respectfully, my question remains
is it possible that a damaged pipe A can cause a blockage in either pipe B or the single line that proceeds from this merge point.

pipe B is clear as is the line after the merge as seen on video
pipe A may have some buildup, may have a break, may be blocked.

 

[frodo]

..not with the video being clear,

according to you, video is clear pipes are good on the 2 lines videoed
except a belly, you say the belly is not an issue.

i do not know why it is not, but ok..

line A being blocked or a broken pipe does not effect B or the main.

if a and b are effected the blockage is the main. common since

 

[jdwx]

many thanks! This is satisfactory!

it was thoughtful of you to create a new pic. i thought mine was pretty good, hard to beat, but yours is better.

Any other votes Yes/No is appreciated. i will be taking this back to my condo association (3 units).

fyi, further explanation below is long and somewhat aside from the point of this thread.

i say the belly does not matter because the belly is still there and the problem is GONE.

pipe A was capped it no longer gets sewage from the kitchen stack. pipe A now starts 3 ft ish before merge point. there is an un-permitted, unvented, no slopsink washer that was and is on the remainder of pipe A, just before the merge. The kitchen stack which used to use pipe A, now has a new line that connects to main in the front of the building.

I do not know the exact details on how the washer was connected before the redesign, except for the washer's location.

I tried to communicate this in my previous thread, but i decided to make it simpler in this one. since i am only concerned with the integrity of the original design (without washer).

did it require the design change taken. it was done under the premise that there was a break/blockage of Pipe A 10 ft before the merge (although there were never any blockages that only affected line A). I can't figure out what was causing the overflows because i know little about plumbing and there is missing information not provided by the people who made the change and own the washer.

i knew that it was not a break in line A, and just want to confirm that the presence of a damaged Line A was not the problem.

of course IF pipe A really was damaged, then it was its own separate problem. the best solution for this separate problem may very well have been a new line, considering the age of the pipe and difficulty in accessing the break (under a door way to a storage area). but there was no reason to believe that a fix of this separate problem would also be the fix for the overflow of the main line.

 

[frodo]

nothing wrong with your drawing, i am lazy, easier for me to draw my own than down load and edit yours