SECTION VIII. (Sub-section 430) Wastewater Valves and Appurtenances. 1. General thru Gate Valves thru 430-3
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1 SECTION VIII (Sub-section 430) Wastewater Valves and Appurtenances Article Page 1. General thru Gate Valves thru Plug Valves thru Check Valves Tapping Valves Valve Boxes Air Release Valves Material Warranty Contractor Warranty Measurement and Payment 430-6
2 WASTEWATER VALVES AND APPURTENANCES SUB-SECTION GENERAL 1.1 SCOPE OF WORK The Contractor shall furnish and install all gate valves, check valves, plug valves and other special valves and appurtenances as shown on the drawings and specified herein. All references to industry standards (ASTM, ANSI, AWWA, etc.) shall be to the latest revision unless otherwise specified. Only those materials included in the Citrus County s approved materials and equipment list shall be installed unless otherwise directed. All materials shall be new unless specifically called for otherwise SHOP DRAWING SUBMITTALS Actual catalog data, brochures and descriptive literature will not be required for items of standard usage which meet the requirements of Sub- Section 430 and are included in the approved materials and equipment list. Any specialty item not shown in this list will require a complete shop drawing submittal. The Engineer may, at any time, require the Contractor to provide a complete detailed shop drawing submittal for any material which, in the Engineer's opinion, may not be in compliance with the Citrus County Utility Standards ROTATION OF OPENING All valves installed within a sewer system to be Citrus County owned shall open by turning to the left or counterclockwise, when viewed from the stem. 1.4 EXTENSION STEMS Where extension stems are required, substantial, adjustable wall brackets and extension stems shall be furnished and located as directed. Extension stems shall be provided on all buried valves when the operating nut is deeper then 30 inches below the final grade. Sufficient stem extension shall be provided so that the nut will be no more than 30 inches below finished grade. 1.5 PAINTING OF VALVES AND VALVE BOX LIDS The interior and exterior of all valves shall be epoxy coated. The topside of all sewer valve box covers shall be painted green with oil based, trafficrated paint. WASTEWATER VALVES AND APPURTENANCES 430-1
3 1.6. LOCATING MARKERS FOR VALVES A V cut shall be carved in the curb closest/adjacent to a below grade valve. This V cut shall be painted green. 2.0 GATE VALVES 2.1 GENERAL Gate valves 3 inches to 12 inches in diameter shall be designed for 200 psi minimum working pressure. Valves over 12 inches in diameter shall be 150 psi minimum working pressure. Gate valves, when full open, shall have a clean waterway equal to the nominal diameter of the pipe. The operating nut or wheel shall have an arrow cast in the metal indicating the direction of opening. Each valve shall have the manufacturer's distinctive marking, pressure rating and year of manufacture cast on the body. Prior to shipment from the factory, each valve shall be tested by applying to it a hydrostatic pressure equal to twice the specified working pressure. Gate Valves smaller than 3 shall be Milwaukee Valve No (nonrising stem) or 1153 (rising stem) or equal, 200 lb. SWP, 400 lb. WOG, heavy duty service solid wedge disc, stainless seat gland packed, union bonnet and threaded ends BURIED VALVES Gate Valves shall be iron body, fully bronze mounted, fully rubber encapsulated, resilient seat, solid wedge, non-rising stem type. Resilient seat gate valves shall conform to applicable sections of AWWA Standards C509. Valve interiors shall be epoxy coated and suitable for use in municipal wastewater All buried gate valves shall be provided with a 2 inch square operating nut and valve box All gate valves 20 inch or larger must be bevel geared for both horizontal and vertical installations. All valves shall be installed vertically unless additional depth of bury is impossible due to physical obstructions ABOVE GROUND VALVES Gate valves located above ground or inside structures shall be hand wheel operated, non-rising stem type with flanged ends and be of the same general construction as buried valves. WASTEWATER VALVES AND APPURTENANCES 430-2
4 2.4. VALVE JOINTS 3.0 PLUG VALVES All gate valves shall have mechanical joint ends, flanged ends, or screw joints to fit the pipe run in which they are to be used, except valves installed on push-on joint pipe shall have mechanical joint ends unless otherwise specified GENERAL All plug valves, unless specifically shown otherwise on the drawings, shall be of the non-lubricated, eccentric plug type with buna "N" neoprene, epoxy or fusion bonded, nylon faced plugs. Valve bodies shall be ASTM A126, Class B cast iron. Port areas of 4 inch through 20 inch valves shall be at least 80% full pipe area and 24 inch and larger valves shall be at least 70% full pipe area. The valve seat material shall consist of either a welded in 1/8 inch overlay of 90% pure nickel, or 316 stainless steel screwed into the cast iron body. Upper and lower plug stem bearings shall be sleeve-type of a stainless steel or other non-corrosive bearing material. The packing shall be adjustable and the bonnet shall be bolted. All bolts, nuts, and washers shall be 316 stainless steel for buried, non-buried, and pit installed service. All buried valves on push-on joint pipe shall have mechanical joint ends and meet the requirements of ANSI A All exposed (nonburied) valves shall have flanged ends in accordance with American Standard B16.1, Class 125. The valves shall be rated for a minimum of 150 psi, non-shock cold W.O.G. and shall provide drip-tight shut off with this pressure in either direction. The operating nut or hand wheel shall have an arrow cast in the metal indicating direction of opening. The valve manufacturer shall furnish certified copies of performance, leakage and hydrostatic testing as outlined in AWWA C504. The interior of all plug valves shall be epoxy coated OPERATORS/ACTUATORS All plug valves 8 inches and larger shall be equipped with totally enclosed worm gear actuators complying with AWWA C504. All gearing shall run in oil. The actuator housing shall be semi-steel with seals to prevent dirt or water from entering the housing. Shaft bearings shall be permanently lubricated bronze bushings. Appropriately sized hand wheel operators shall be provided for each non-buried, gear-actuated valve. WASTEWATER VALVES AND APPURTENANCES 430-3
5 3.3. BURIED VALVES Buried valves shall have seals on all shafts and gaskets on the valve covers. Buried valves shall be provided with 2 inch square operating nuts VALVE JOINTS 4.0 CHECK VALVES All plug valves shall have mechanical joint ends if buried on push-on joint pipe or flanged ends if above ground on flanged pipe. Check valves shall conform to the requirements of AWWA C508. Check valves shall be standard iron body, swing type with straight-away passageway of full pipe areas. Valves shall be bronze mounted with self-adjusting, rubber-faced disc. Disc shall operate on a 304 stainless steel shaft connected to a 316 stainless steel outside lever and 316 stainless steel spring. Valves shall be 150 psi working pressure minimum, except as noted otherwise. Springs to be rated as per manufacturer's recommendations. Buried check valves shall be installed in an approved access box with traffic rated cover. 5.0 TAPPING VALVES 5.1. BODIES Tapping valves shall be iron body, bronze mounted gate valves, non-rising stem, open left, resilient seat, 2 inch square operating nut, for vertical mounting in approximately level setting on buried wastewater lines. The valve ends shall be mechanical joint for use with cast iron pipe on one side and standard flanged (class 125) on the other. Valves shall conform to Sub-Section 100 of these specifications HYDROSTATIC AND LEAKAGE TEST After installing a tapping sleeve and valve, a hydrostatic and leakage test shall be performed. The test will be conducted by introducing water into a tap or test hole located at the neck of the outlet half of the sleeve, on sleeves furnished with said tap, and with the tapping valve in the closed position. Sleeves shall be provided with a test plug. The sleeve and valve shall be capable of maintaining a test pressure of 150 psi for 30 minutes duration, with no sign of visible leaks. All leaks shall be repaired by removing and replacing defective items with items free of defects, after which the sleeve and valve shall be re-tested. Such repair and re-testing shall be done until the installation passes the specified test. The Contractor shall furnish and install any necessary temporary restraints, gauges, pumps and other incidental and appurtenant items necessary to complete this work, and shall remove same upon completion of the test. A watertight plug shall then be inserted into the test hole. WASTEWATER VALVES AND APPURTENANCES 430-4
6 6.0 VALVE BOXES 6.1. GENERAL The Contractor shall furnish, assemble and install an adjustable 3-piece valve box for each buried valve. Each valve box installed in non-paved areas shall be installed with a 24 inch square, 6 inch thick concrete collar poured to grade around the top of the valve box cover. The concrete shall have a minimum strength of 2500 psi. Provide brass identification tag with Sewer, valve size, and valve type engraved on tag epoxyed or riveted to interior of valve box. Tag shall be 2 inch diameter, 1/8 inch thick brass, located a maximum of 2 inches below the top of the valve box BOXES Adjustable 3-piece valve boxes of suitable length shall be used. Cover shall be marked "Sewer". The top section shall be adjustable for elevation and shall be set to allow equal movement above and below finished grade. The base shall be centered over the valve and shall be on line with nut at top of valve stem and the entire assembly shall be plumb. Boxes for paved areas shall be cast iron, and boxes for non-paved areas may be PVC. Cast iron castings shall be manufactured of clean, even grain, gray cast iron conforming to ASTM Designation A48, Class 20B, Gray Iron Castings; and shall be smooth, true to pattern, free from blow holes, sand holes, projections, or other harmful defects and shall be coated with a single thin coat of coal tar epoxy. The cover will not rock after it has been seated in any position in its associated jacket DEBRIS CAP Debris caps shall be required in all valve boxes when shown on the plans and specified. The debris cap shall be comprised of a hollow member having a cylindrical outer surface, a closure for one end and three point resilient contact pads projecting from the outer surface. One contact pad shall be movable by means of a cam having a low angle of advance whereby external forces applied to the cam via the movable contact pad will not cause rotation of said cam. The cap shall have a flexible skirt providing an outward seal preventing debris from getting past the cap. The cap must withstand, without slipping, a minimum vertical force of 50 lbs. at a loading rate of 1.0 inches/minute. The cap shall have retaining prongs to retain a standard locating coil, and shall be capable of installing a standard fitting for Lock-out/Tag-out in compliance to all standards and requirements of State and Federal OSHA guidelines. WASTEWATER VALVES AND APPURTENANCES 430-5
7 7.0 AIR RELEASE VALVES Where called for on the drawings, valves shall be the Air Release Valve type as listed in the Citrus County Utilities Division (UD) standard details. An isolation valve shall be installed at the connection to the force main for general maintenance to the valve. 8.0 MATERIAL WARRANTY The manufacturer of materials furnished on the project shall supply to Citrus County, a one (1) year unconditional warranty. The warranty shall be limited to the material that shall constitute complete replacement and delivery to the site of materials only to replace defective materials with new materials conforming to the specifications CONTRACTOR WARRANTY The Contractor shall supply to Citrus County a one (1) year unconditional warranty. The warranty shall include materials and installation and shall constitute complete replacement and delivery to the site of materials and installation of same to replace defective materials or defective workmanship with new materials/workmanship conforming to the specifications MEASUREMENT AND PAYMENT The quantities of items to be measured and paid for under this section shall be as shown in the contract proposal, completed and accepted, including all incidental work and related materials. WASTEWATER VALVES AND APPURTENANCES 430-6
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