GENERAL
The fabricated slide gates where shown in the plans and specifications and listed in the slide gate schedule shall be as manufactured by Coldwell-Wilcox Technologies, LLC of Cincinnati, Ohio. Gates shall be aluminum self-contained or conventional rising or non-rising stem type with embedded or surface mounted guide frames as called out by the specifications and site drawings.
The equipment provided shall be fabricated, assembled and placed in proper operating condition per the drawings, specifications, engineering data, instructions and recommendations of the gate manufacturer unless otherwise noted by the engineer. Gates and operators shall be supplied with all parts and accessories as specified within the site specifications and drawings and as required for a complete installation.
GOVERNING STANDARDS
Except as modified or supplemented herein, all gates and operators shall conform to the applicable AWWA standards.
MANUFACTURER'S QUALIFICATIONS
Slide gates shall be the latest standard product in regular production by a manufacturer whose products have proven reliable in similar service. A single manufacturer shall supply slide gates.
MATERIALS
All materials will comply with applicable provisions and recommendations of the following, except as otherwise shown or specified:
- Frame, Leaf ASTM B209, B308, Alloy 6061-T6
- Stem ASTM A276 Type 304(L) or 316(L) Stainless Steel
- Fasteners ASTM A276 Type 304(L) or 316(L) Stainless Steel
- Seals Neoprene ASTM D2000 50-60 Durometer
- Seats UHMW
- Stem Cover Butyrate, Clear
- Hand wheel ASTM A-126, Class B Cast Iron
- Hand Crank A36 Steel
SUBMITTALS
Manufacturer’s data and drawings shall be submitted for approval in accordance with site specifications and engineering drawings. Manufacturer’s submittal shall include but not limited to gate material specification sheet, gate data summary sheet, calculation sheets, site plan drawings and paint/coating data sheets. Calculation sheets shall contain operator forces, tensile and buckling strength of stem, structural strength calculations and other calculations to verify that the design meets the specification requirements.
PERFORMANCE
Gates shall be designed and shop tested to the applicable AWWA governing standard. Design and operating heads shall be per the site schedule and/or specifications.
DISC
Disc shall be constructed of _" aluminum plate type 6061 -T6 reinforced with structural members to withstand maximum seating heads and unseating heads as required by the schedule and specification. The stem mounting clips or the thrust nut pocket shall be welded to the disc. Deflection of the disc shall not exceed 1/720 of the span under the design head.
FRAME
Gate frame shall be self-contained embedded channel mount or conventional/self-contained surface flange mount type. Frame shall form guides consisting of extruded and/or structural aluminum type 6061-T6 shapes weighing a minimum 3.9 pounds per foot. Gate guides shall extend at least 1.5 times or more past the disc height to allow the gate too fully open. Guides shall be designed and constructed to withstand the total thrust caused by water pressure. Guides shall be embedded in concrete or surface mounted to concrete as shown on the plans.
STEM
Operating stem shall be of Type 304(L) or 316(L) stainless steel minimum 1-1/4 inches diameter and attached to the disc by stem mounting clips or thrust nut and pocket. Stem shall be designed to transmit in compression at least 2-1/2 times the rated output of the operating mechanism with a 40-pound effort on the crank or hand wheel.
Stems shall have a slenderness ration (L/R) of 200 or less. The threaded portion of the stem shall have machined cut _" pitch by _" lead left hand threads of the Acme type unless otherwise specified. Stainless steel or manganese bronze couplings threaded and keyed, or bored and pinned to the stems shall join stems of more than one section. All threaded and keyed couplings of the same size shall be interchangeable. Stems shall be provided with adjustable stop collars to prevent over travel on manually operated gates.
STEM GUIDES
Stem guides shall be UHMW bushing block aluminum angle frame mounted on self-contained gates and bronze bushed ASTM A126, class B cast iron for conventional gates and shall be spaced as required by manufacturer.
SEALS
Flush bottom seal shall be a compressible neoprene at the invert of the opening and extended into the side guides forming a complete seal for the entire width of the disc. Neoprene "J" seal can be bolted to the aluminum frame for additional sealing capabilities on the unseating side. Hardware shall be Type 304 or 316 stainless steel.
MANUAL OR ELECTRIC OPERATED GATES
HANDWHEEL TYPE: A hand wheel operator shall be provided with a 1:1 ratio. An acme threaded manganese bronze lift nut shall be provided to engage the operating stem. Anti-friction bearings shall be provided to properly support both opening and closing thrusts. The hand wheel shall operate the gate under the specified operating heads with not greater than a 40 pound rim pull approximately 36 inches above the operating floor. All components shall be totally enclosed in a cast iron weatherproof housing. Hand wheel operator shall be bench stand mounted or cast iron floor stand mounted with or without a cast iron or A36 fabricated steel wall bracket.
HANDCRANK TYPE: A hand crank operated gearbox shall be provided with a gear ratio as needed to ensure 40 pounds or less rim pull at the hand crank under the specified operating heads approximately 36 inches above the operating floor. An acme threaded manganese bronze lift nut shall be provided to engage the operating stem. Anti-friction bearings shall be provided to properly support both opening and closing thrusts. All components shall be totally enclosed in a cast iron weatherproof housing. Hand crank operator shall be bench stand mounted or cast iron floor stand mounted with or without a cast iron or A36 steel fabricated wall bracket.
TEE WRENCH TYPE: A tee wrench operated 2" square nut stem mounted with a 1:1 ratio or a 2" square nut gearbox mounted with a gear ratio as needed to ensure 40 pounds or less rim pull at the tee wrench under the specified operating heads. A manganese bronze lift nut shall be provided to engage the operating non-rising stem. Anti-friction bearings shall be provided to properly support both opening and closing thrusts. All components shall be totally enclosed in a cast iron weatherproof housing. Tee wrench operator shall be bench stand mounted, floor box mounted or cast iron/A36 steel fabricated wall bracket.
ELECTRIC ACTUATOR TYPE: The electric actuators shall be sized for the required breakout torque and average operating torque including a 1.50 safety factor. The electric actuators shall be bench stand or pedestal mounted. Actuators can be either open/close or modulating service and shall be designed for twelve inches (12") per minute disc travel (48 RPM actuator speed). Disc travel may vary from nine (9) to fifteen (15) inches per minute depending on design requirements. The electric motor actuator shall include, but not limited to, the motor, gearing unit, limit switches, torque switches, manganese bronze stem nut, declutch lever, compartment heater and hand wheel for manual operation at 40 pounds or less rim pull. As a minimum the motor actuator shall be Nema 4 (weathertight) construction. Coldwell-Wilcox Technologies furnishes electric actuators manufactured by EIM, Limitorque, Auma, Rotork and equal.
A clear plastic stem cover with closed, open, 1/4, 1/2 and 3/4 position indicator decals shall be supplied for each rising stem.
PAINTING
Steel components such as the hand wheel and operator bearing housing shall receive manufacturer's standard TNEMEC series N140-1255 pota-pox beige and TNEMEC series 69 pond 28BL finish prior to shipment. Total system shall be 12-16 mils DFT.
SHOP TESTING
Each gate shall be fully assembled and shop-inspected in the vertical position for proper seating. The disc shall be fully opened and closed in its guide system to ensure that it operates freely and seals per the AWWA standard.
INSTALLATION
Installation shall be in complete accordance with manufacturer's instructions and recommendations. Anchor bolts will be set in accordance with approved manufacturer's drawings.
START-UP AND TEST
Contractor shall make adjustments required to place system in proper operating condition. Contractor shall conduct functional field test of each slide gate in the presence of the Owner's Project Representative to demonstrate that each part and all components together function correctly.
|
