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New Handy Site On Plumbing

Suppose we wish to know how far back from the center of a vertical stack we must keep the center of a 45° Y in a horizontal drain in order to connect later on with a 1/6 bend, or 60° elbow. Represent this distance by letter C.
From drawing we find: C = A X 1.41.
Distance back equals Offset times 1.41.
If Offset is 36": C = 36 X 1.41 = 51".
Distance back is 51".
Any distance can be measured in the same manner.
A 45° elbow or 1/8 bend may be used in place of the Y. The same measures will apply.

This drawing and these measures can also be applied to the case when a horizontal drain connects with a vertical stack where the Y is on the stack, as, for instance, connecting ceiling work to a stack.

There is yet another combination of fittings which though less frequently met with than that combination just explained, still it is very desirable to know. This combination is that of a 60° Y and 1/8 bend or 45° elbow, or the combination of 1/6 and 1/8 bends.

Now in this case as in that previously explained consider the figure in light solid lines as a box. Let the center of the 60° Y be at the lower nearer corner of the box. The center of the 45° elbow or 1/8 bend be at the further upper corner of the box diagonally opposite the Y.

As in the previous case as we Offset we Rise. However, in this case the measures have a different proportion to each other than they did in the previous case.

Represent the Offset by letter A.
Represent the Diagonal by letter B.
Represent the Rise by letter D.
To find the Diagonal when the Offset is known.
From drawing B = A X 2.
Diagonal equals Offset times 2.
Suppose the Offset is 36".
Then the Diagonal equals 36X2 = 72".
To find the Rise when the Offset is known.
D = A X 1.41.
Rise equals Offset times 1.41.
If Offset is 36" Rise is 36 X 1.41 =51".