4.4 SR 04-19-2021 - Laserfiche WebLink

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City of Elk River Design Standards An integral stem nut design in those sizes is not allowed. E. All body to body bolting material shall be Type 304 SS, develop the physical strength characteristics of ASTM A307 and shall have the dimensional requirements of AWWA C- 515 and ANSI 18.2.1. All body to bonnet bolting shall be of the same size and length. All bolts shall have square or hexagonal heads. Metric bolts, socket head cap screws, or recessed alien -head type bolts filled with hot -melt type wax will not be allowed. F. Designs employing two-piece independent thrust collars will not be allowed. All stem diameters and the prescribed number of turns to open shall be as detailed in the applicable portions of Table 4 of AWWA C-515. The stem o-rings above the thrust collar shall be replaceable with the valve fully open and while subjected to full working pressure. 0-rings set in a cartridge type design will not be allowed. Valve shall be equipped with thrust washers above and below the thrust collar to reduce the operating torque of the valve. G. All internal and external surfaces of the valve shall be coated prior to assembly, with epoxy. All valve body gaskets shall be of a pressure energized o-ring design. H. All valves 14" and larger shall be equipped with lifting lugs or eyebolts for lifting. All valves 16" and larger shall be equipped with bevel gearing for horizontal or spur gearing for vertical installation to reduce operating torque. Valves equipped with bevel gears shall be equipped with flushing ports on each wedge guide channel. Where allowable, valves should be installed in the vertical position. Valves employing the use of an external and/or integral by-pass for torque reduction are not allowed. I. Valves shall be manufactured by a company domiciled in the United States, as well as have a history in manufacturing Resilient Wedge Gate Valves greater than 25 years. All Resilient Wedge Gate Valves shall be American Flow Control Series 2500 or Engineer pre - approved equal. J. Valve boxes shall be 51/4" diameter shaft suitable for T-6" of cover over the top of the watermain. Boxes shall be cast iron screw type two-piece boxes with the word "WATER" on the lid. Valve boxes shall be Tyler 6850 with 51/4" Drop Lid, or equal. K. All valve boxes shall be installed upon the valve with the use of a Gate Valve Adaptor as manufactured by Adaptor Inc. or approved equal. The adaptor shall be considered incidental to the valve box installation. 10. Trace Wire A. Open Trench - Trace wire shall be #12 AWG Copper Clad Steel, High Strength with minimum 450lb. break load, with minimum 30 mil HDPE insulation thickness. B. Directional Drilling/Boring - Trace wire shall be #12 AWG Copper Clad Steel, Extra High Strength with minimum 1,150 lb. break load, with minimum 30 mil HDPE insulation thickness. C. Trace wire — Pipe Bursting/Slip Lining - Trace wire shall be 7 x 7 Stranded Copper Clad Steel, Extreme Strength with 4,700 lb. break load, with minimum 50 ml HDPE insulation thickness. Construction Wet Tap with Valve The tapping sleeve and resilient seated gate valve assembly shall be installed on the watermain pipe after thoroughly cleaning the pipe to be tapped. The sleeve shall be assembled on the pipe and the bolts tightened per the manufacturer's specifications. Shell cutters shall be the maximum size allowed for the tap being made. Size on size taps shall utilize an inch undersized shell cutter. Electrical conductivity straps shall be provided to bypass the tapping sleeve assembly. © City of Elk River, Minnesota — All rights reserved