A video inspection of an underground sanitary run shows a belly where the pipe reverses slope for several feet. The slab has not been poured yet. What is the correct field response?
Correct Answer
C) Correct bedding and pipe grade before the run is covered
Gravity drainage depends on continuous slope; a belly should be corrected before the pipe is covered and access is lost. Other choices leave a maintainability and blockage problem.
Why This Is the Correct Answer
Gravity drainage depends on continuous slope; a belly should be corrected before the pipe is covered and access is lost. Other choices leave a maintainability and blockage problem.
Why the Other Options Are Wrong
Option A: Accept it because wastewater will eventually pass
In mechanical and plumbing, Accept it because wastewater will eventually pass is the wrong selection for Pipe slope reversal: it leaves out the controlling Pipe slope reversal result: Correct bedding and pipe grade before the run is covered.
Option B: Limit pipe slope reversal to raise the downstream cleanout only
The trap in B is Raise the downstream cleanout only. That selection is wrong because the option delays or omits the controlling step.
Option D: The MEP foreman should pour the slab and rely on future flushing
Choice D (Pour the slab and rely on future flushing) is rejected because it points to Pour the slab and rely on future flushing, but.
Memory Technique
Picture a panel space on the jobsite; pipe slope reversal is solved by the action that leads to Correct bedding and pipe grade before the run is covered.
Reference Hint
Open Pipe and Excavation Contracting, 2011; use the index entry or section for "Gravity sanitary pipe grade control" to confirm that Gravity drainage depends on continuous slope; a belly should be corrected before the pipe is covered and access is lost.
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