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Not more than 3 meters, generally one layer.
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Generally speaking, one clip per meter, two per layer is enough.
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It is enough for you to play two floors at most, because the pipe is through the wall, there is no problem with fixing, mainly afraid of slight shaking and noise when the water is dripping!
There are no clear requirements, just leave the manholes well.
There is grease in the kitchen, which is easy to stick to the pipe wall, easy to block, or the running water is not smooth. Therefore, it is better to separate the sewer pipes from the kitchen and bathroom.
Of course, it is good that it can be opened for maintenance when it is blocked, and if there is no maintenance port, the pipe can only be dismantled.
Two roots, each household shall be separated.
There is no clear provision in the construction quality acceptance specification for building water supply and drainage and heating engineering to install a water-stopping ring, so the water-stopping ring can not be installed when the design is not clearly specified in the construction.