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In determining the available pressure to overcome friction in the piping system, head meter and other losses shall be deducted from the minimum available pressure source. When the pressure exceeds 100 psi (690 kPa) at any plumbing fixture, the pressure shall be reduced by an approved type reducing valve. The minimum size of fixture supply pipes are shown in Table 18-29-604.5.
Where individual pressure balancing in-line valves for individual fixture fittings are installed, such valves shall comply with ASSE 1066. Such valves shall be installed in a location with access. The valves shall not be utilized alone as a substitute for the balanced pressure, thermostatic or combination shower valves required by Section 18-29-424.3.
(Amend Coun. J. 10-14-21, p. 37722, Art. VI, § 14)
The installation of a water service pipe shall be prohibited in soil and ground water contaminated with solvents, fuels, organic compounds or other detrimental materials causing permeation, corrosion, degradation or structural failure of the piping material. Where detrimental conditions are suspected, a chemical analysis of the soil and ground water conditions shall be required to ascertain the acceptability of the water service material for the specific installation. Where detrimental conditions exist, approved alternative materials or routing shall be required.
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