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This Code shall not be construed as imposing upon the municipal, county or state authority
any liability or responsibility for damages to any person or property caused by any
defect in any piping or appliance mentioned herein, or by installation thereof, nor
shall the local governing body or any official or employee thereof, be held as assuming
any such liability or responsibility by reason of the inspection authorized hereunder
or the certificate of approval issued by the Inspector.
SECTION 2:
That Section 202, Definition of Terms, be altered by adding the following definitions
in their proper places, and that the definition on "Safe Waste System" be replaced
as follows:
DIRECTOR: The Director of the Bureau of Buildings is the administrative authority
to administer and enforce the provisions of this Code as adopted or amended.
SAFE WASTE SYSTEM: A horizontal waste system composed of main waste line, branch waste
lines, auxiliary vents and a master trap with a fresh air vent. (See Section 1605
and Drawings A15, A16 and A17 of Appendix K.)
SECTION 3:
That Section 404 entitled Trenching, Excavation and Backfill be amended by adding,
Section 404.6 entitled Excavating and Trenching Safety, to read as follows:
"All excavations or trenching over 5 feet deep shall be sloped or supported and provided
with an adequate means of exit, in accordance with Occupational Safety and Health
Administration Federal Register 29CFR 1926.650, 1926.651 and 1926.652."
SECTION 4:
That Section 504 entitled Limitations of use of materials listed in Table 500 be amended
by deleting, Section 504.8.1 and substituting the following in lieu thereof:
"504.8.1 Approved air admittance valves may be permitted for installation in plumbing
systems five branch intervals or less, with prior approval from the Director of the
Bureau of Buildings, or his authorized representative. Such valves shall comply with
ASSE 1051 listed in Table 500."
SECTION 5:
That Chapter 9, entitled Plumbing Fixtures, be amended as follows:
1.
That Section 914.1.4 be deleted and the following substituted in lieu thereof:
"914.1.4 Floor drain trap seals subject to evaporation shall be fed from an approved
plumbing fixture or by means of an approved automatic priming device designed and
approved for that purpose."
2.
That a new Section 921.9 entitled Thermal Expansion, be added as follows:
921.9 Thermal Expansion.
(a) When water is heated in a distribution system or branch of the system that has
been closed by the installation of a backflow preventer, a pressure reducing valve,
or any other checking device, an approved auxiliary relief valve shall be installed
at an accessible location downstream from the check device to limit thermal expansion
of the heated water to not more than 80 psi no-flow pressure at any fixture on the
system. A discharge line not less than ¼-inch inside diameter shall be piped to an
approved location where no water damage would result from the discharge, and any water
in the discharge pipe would drain by gravity, and be protected from freezing.
(b) The auxiliary relief valve shall be in addition to the water heater safety relief
valve. This thermal expansion control device shall be designed and trimmed for repeated
operation. The valve shall be a minimum ½-inch pipe size, shall be adjustable and
calibrated, and shall include a tag describing its function. The maximum adjustable
range of the thermal expansion valve shall be not more than 125 pounds (psi). The
maximum setting of the calibrated relief valve shall provide not more than 80 pounds
static (no-flow) pressure at any fixture in the system, but in no case shall the setting
be less than 25 pounds below that of the water heater safety relief valve.
EXCEPTION: In lieu of the above auxiliary relief valve, an approved pre-charged expansion
chamber that is permanently separated from the water may be used. The chamber shall
have a rated working pressure not less than the pressure setting of the water heater
safety relief valve, and a corresponding temperature rating not less than 210°F. The
chamber shall have the capacity to limit thermal expansion to the above specified
80 psi maximum.
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