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125
tioned above. This is because you will end up showing the room as a partial floor
plan view. You simply omit the walls entirely from the drawing. The reason be-
hind doing so is that everybody knows that the walls are there but they are not
shown in the isometrics drawing in order to put an emphasis on the plumbing and
eliminate every detail that is not necessary. Also, a practical thing that can be dif-
ficult to some stands in laying out a 45 degree angle in isometric schematics. In
order to achieve this all you need to do is draw a square and then lay out the 45
degree angle. This will make it a lot easier to perform the degrees shift. You can
locate the chamfer by measuring equal distances from the corners that should be
in the drawing even if they are not.
The key element in drawing plumbing isometrics is to keep trying. You will
eventually get a lot better than you are now. Consult various isometrics drawn by
professionals and you will soon see that it is a lot easier than you previously imag-
ined it. Practice makes better and this goes for everything related to plumbing and
not just drawing isometrics.
How to perform a smoke test on sewer plumbing
Smoke testing is a process that is periodically performed as a part of an
ongoing sanitary sewer inspection program. It is utilized in order to identify ar-
eas that see clear water entering the system and that could be causing eventual
sanitary sewer backups. The test will see a non toxic smoke being forced into
the sewer plumbing of the neighborhood or in smaller areas. Keep in mind that
direct contact with this smoke can cause minor respiratory irritation so if there
are individuals that suffer from various respiratory conditions they should not
come in contact with the smoke.
Smoke testing forces air that is filled with smoke in a sanitary sewer line.
We are dealing with pressure so it will end up filling the main lines and any
other connections. If there are any leaks the smoke will appear on surface, thus
revealing possible places that show problems. Not much pressure is needed and
the minimum required is enough to overcome the pressure of the atmosphere. If
there are openings that can permit the smoke to follow them, smoke tests are ef-
fective, no matter the soil type, surface type or the depth of the lines tested.
The truth is that the most cost effective and efficient way to find out the loca-
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