To add or modify piping that is in the field, we need to verify what we are working with first. Before going to the field, gather all existing drawings, photos, and flow sheets of the area you are working on. This might help out develop sketches in advance to verify in the field.
Sometimes, mostly never, things do not get installed in the field as square as they are on our models and drawings. So we either need to locate these things for future additions
Recently, on one of the leading internet technical forums, a person posted a concern about a perceived engineering problem. Their concern was about the relative settlement between different objects that would effect the fit-up of the connecting pipes.
Where pipes pass through external walls, in basement areas, a puddle flange may be required. Location which may be below the water table or in areas liable to flooding or in areas which may need to be sealed against methane gas coming from made up ground etc.
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