Where static water pressure
in the water supply piping is exceeding 80 psi (552 kPa), an approved
regulator preceded by an adequate strainer shall be installed and the static pressure
reduced to 80 psi (552 kPa) or less. Pressure
regulators) equal to or exceeding 11
inches (40 mm) shall not require a strainer. Such regulator(s) shall control the pressure
to water outlets in the building unless otherwise approved
by the Authority Having Jurisdiction
. Each such regulator and strainer shall be accessibly located aboveground or in a vault equipped with a properly sized and sloped boresighted drain
to daylight, shall be protected from freezing, and shall have the strainer readily accessible
for cleaning without removing the regulator or strainer body or disconnecting the supply piping.
Pipe size determinations shall be based on 80 percent of the reduced pressure where using Table 610.4.
An approved expansion tank shall be installed in the cold water distribution piping downstream of each such regulator to prevent excessive pressure from developing due to thermal expansion and to maintain the pressure setting of the regulator. Expansion tanks used in potable water systems intended to supply drinking water shall comply with NSF 61. The expansion tank shall be properly sized and installed in accordance with the manufacturer's installation instructions and listing. Systems designed by registered design professionals shall be permitted to use approved pressure relief valves in lieu of expansion tanks provided such relief valves have a maximum pressure relief setting of 100 psi (689 kPa) or less.