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Orono Metro Self Storage Plumbing Plan No. PLB 1205-00052 Page 2 May 9, 2012 3. Changes in direction in drainage piping must be made by appropriate use of wyes and bends. Sanitary tees are not allowed where the direction of flow changes from either vertical to horizontal or horizontal to horizontal(see Minnesota Rules, part 4715.2410). 4. The restroom floor drains are shown to be served with double wyes in the horizontal position on the submitted waste and vent riser diagram. Double wyes may not be used for drainage fittings in the horizontal position(see Minnesota Rules, part 4715.2420, subpart 3). Proper pipe slope cannot be maintained on both of the offset branches. 5. A cleanout shall be provided on a common vertical fixture drain or common vent serving two fixture traps that-connect to a vertical drain at the same level. The cleanout shall be the same nominal pipe size as the drain serving the fixtures. Where the vertical drain is accessible through the trap opening,the cleanout may be eliminated(see Minnesota Rules, part 4715.1000). 6. It is recommended that a cleanout be provided where new waste and vent piping connects with existing plumbing to facilitate required testing of the new installation. 7. A water heater with a maximum tank capacity of 6 gallons or less may be concealed in a ceiling space provided the water heater has been set in an overflow pan. The overflow pan must be constructed of a corrosion resistant material, have side walls extending at least 4 inches upward, and have an outlet size that is not less than the size of the supply line to the water heater. The outlet must continue undiminished in size to a point of safe disposal below the ceiling area. Tools must not be required to gain access to the water heater (see Minnesota Rules, part 4715.2240). 8. Equipment used for heating water or storing hot water shall be protected by approved safety devices in accordance with Minnesota Rules, part 4715.2210 and part 4715.2230. Verify that a temperature and pressure relief valve is provided for the water heater. It is recommended that the relief valve discharge pipe be routed independently to a point of safe disposal below the ceiling. Please note, a relief valves direct connection to a fixtures waste or vent piping is not an appropriate place of disposal. 9. Water closets in public bathrooms must have elongated bowls with open-front seats, except round bowls with closed-front seats may be used in residential or dwelling-type occupancies(see Minnesota Rules, part 4715.1420). The maximum water volume per flush of a floor-mounted water closet shall be 1.6 gallons. Water closets shall comply with American National Standards Institute Al 12.19.6 (see Minnesota Statutes, Section 326B.43, subd. 4). 10. PVC plastic pipe used for the drain, waste, and vent system shall comply with ASTM Standard D2665, D2949 or F891 (see Minnesota Rules, part 4715.0570 through part 4715.0600). 11. The installation of chlorinated polyvinyl chloride(CPVC)pipe for water distribution systems must meet the following requirements(see Minnesota Rules, part 4715.0520): a. Pipes less than 2%-inch in size must comply with ASTM Standard D2846. b. Pipes 2V2-inch to 6-inch in size must be schedule 80 and must comply with ASTM Standard F441. c. Solvent weld joints must either include the use of a.primer which is of contrasting color to the pipe and cement or a one-step solvent cement complying with ASTM Standard F493 and ASTM Standard D2846 (see Minnesota Rules, part 4715.08 10, subpart 2). d. The installation must be in accordance with International Association of Plumbing and Mechanical Officials(IAPMO)Installation Standards 20-98.