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20.08.049 for leakage at 200 psi for one (1) hour minimum. 107.1.5 All sprinkler riser piping shall be either non-ferrous metallic pipe (copper, or brass) or CPVC. All piping above the flow switch shall be protected by sheet rock or plywood. Note: No ferrous (black iron, iron or galvanized) pipe is permitted. Sec. 9.108 Units Metric units of measurement in this standard are in accordance with the modernized metric system known as the International System of Units (SI). Two (2) units (liter and bar), outside of but recognized by SI, are commonly used in international fire protection. 108.1 If a valve for measurement as given in this standard is followed by an equivalent value in other units, the first stated is to be regarded as the requirement. A given equivalent value may be approximate. CHAPTER 2 *Water Supply Sec. 9.201 General Provisions Every automatic sprinkler system shall have at least one (1) automatic water supply. When stored water is used as the sole source of supply, the minimum quantity shall equal the water demand rate times ten (10) minutes. Sec. 9.202 *Water Supply Sources The following water supply sources are acceptable: 202.1 A connection to a reliable water works system. 202.2 *An elevated tank. 202.3 A pressure tank installed in accordance with NFPA 13, Standard for the Installation of Sprinkler Sys- tems, and NFPA 22, Standard for Water Tanks for Private Fire Protec- tion. 202.4 A stored water source with an automatically operated pump. Sec. 9.203 Multipurpose Piping Sys- tem A piping system serving both fire sprinkler and domestic needs shall be acceptable when: 203.1 In common water supply con- nections serving more than one (1) dwelling unit, five (5) gallons per minute (19 L/min) per dwelling unit is added to the sprinkler system demand to determine the size of common piping and the size of the total water supply requirements. Exception: Note Chapter 4 for spe- cific hydraulic calculation require- ments. (Pleasanton April 2000) '700_4