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3. Outlets. Ail interior wet standpipes shall be equipped with a one and one-half-inch (1 1/2") valve in each story, including the basement or cellar of the building and located not less than three feet (3') nor more than six feet (6') above the floor. 4. Water supply. The wet standpipe system shall deliver not less than 35 gallons of water per minute at not less than 25 pounds per square inch residual pressure from each of any two outlets flowing simultaneously for 30 minutes. When more than one interior wet standpipe is required in the building, such standpipes may be connected at their bases or highest points by pipes of equal size. Where combination standpipes are installed the one and one-half-inch (1 1/2") outlet system may be supplied from the combination system with a two-inch (2") connecting line. 5. Pressure and gravity tanks. Pressure or gravity tanks shall have a capacity sufficient to furnish at least 70 gallons of water per minute for 30 minutes. Other such tanks shall be located so as to provide not less than 25 pounds per square inch residual pressure from each of two outlets flowing simultaneously for 30 minutes. Discharge pipes from pressure tanks shall extend two inches (2") from and into the bottom of such tanks. All tanks shall be equipped with a manhole, ladder and platform, drainpipe, water and pressure gauges, and a pressure relief valve. Each pressure tank shall be tested in place after installation and proved tight at a hydrostatic pressure 50 per cent in excess of the working pressure required, but not less than 150 pounds per square inch. W/aere such tanks are used also for domestic purposes, the supply take-off for such purposes shall be located above the required capacity of such tanks. Supply tanks shall be supported on incombustible construction with not less than three-foot (3') clearances over the top and under the bottom to adjacent construc- tion. Approved pressure gauges shall be provided at pressure tanks and at the air pump. 6. Fire pumps. Fire pumps shall be approved and shall deliver not less than the required fire flow and pressure. Such pumps shall be supplied with adequate power source and shall be automatic in operation, Where the wet standpipe system is supplied with water from the domestic supply of the building, approved fire pumps shall not be required provided the domestic pump used delivers the required fire flow. 7. Hose and hose reels. Each wet standpipe outlet shall be supplied with a hose not less than one and one-half inches (1 1/2") in diameter. Such hose shall be equipped with an approved variable fog nozzle. An approved hose reel rack or cabinet shall be located so as to make the hose accessible. The hose reel rack or cabinet shall be recessed in the wall or protected by suitable cabinets. 8. Connection to fire-extinguishing systems. Wet standpipe systems may be supplied from a fire-extinguishing system comply- ing with U.B.C. Standard No. 38-1-67 and shall be connected as required in Section 3801. 9. Pressure reduction. Where the static pressure at any stand- pipe outlet exceeds 100 pounds per square inch, an approved pres- sure reduction device shall be permanently installed at the outlet to reduce the water flow so that the nozzle pressure does not exceed 80 pounds per square inch in accordance with Table No.38A. Combination Standpipes Sec. 3805. (a) General. Ail combination standpipes shall comply with the requirements of this Section. Design and in- stallation shall be in accordance with U.B.C. Standard No. 38- 3-70. Where a combination standpipe system is installed in accordance with this Section, a separate dry standpipe system need not be installed. -8-