All horizontal piping shall be run in practical
alignment and at a uniform grade of not less than 1/4 of an inch per
foot and shall be supported or anchored at intervals not to exceed
10 feet. All stacks shall be supported at their bases, and all pipes
shall be rigidly secured.
All changes in direction shall be made by the
appropriate use of forty-five-degree Y's, half Y's, long sweep quarter
bends, sixth, eighth or sixteenth bends, except that single sanitary
T's may be used on vertical stacks and short quarter bends may be
used in soil and waste lines where the change in direction of flow
is from horizontal to the vertical. T's and crosses may be used in
vent pipes.
No double hub, double T or double sanitary T-branch
shall be used on soil or waste lines. The drilling and tapping of
house drains, soil, waste or vent pipes and the use of saddle hubs
and bands are prohibited.
In the installation of any drainage system,
dead ends shall be avoided.
All pipes passing under or through walls shall
be protected from breakage. All pipes passing through or under cinder
concrete or other corrosive material shall be protected against external
corrosion.
Workmanship shall be of such character as fully
to secure the results sought to be obtained in all of the sections
of this chapter.
All plumbing installed by the owner shall comply
with the requirements of this chapter, and in such event the word
"owner" shall be substituted for the word "plumber" throughout this
chapter.
