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    SECTION 11285

    GATES AND APPURTENANCES

   PART 1 - GENERAL

   1.01 SECTION INCLUDES

    A. Flap Gates.

    B. Sluice Gates.

    C. Stop Log Grooves.

    D. Special Gate Operators.

    E. Floorstands.

   1.02 RELATED SECTIONS

    A. Section 05500 - Metal Fabrication.

    B. Section 09915 - High Build Glazed Coatings.

    C. Section 11900 - Pipe and Appurtenances.

    D. Section 11951 - Electric Motors.

    E. Section 13320 - CSO Detention Basin Operating and Monitoring System.

    F. Section 16010 - Basic Electrical Requirements.

   1.03 REFERENCES

    A. AWWA C501: Sluice Gates.

    B. ASTM A36: Structural Steel.

    C. ASTM A126: Gray Iron Castings.

    D. ASTM A276: Stainless and Heat-Resisting Steel Bars and Shapes.

    E. ASTM B308: Aluminum-Alloy 6061-T6.

    F. ASTM B584: Copper Alloy Sand Castings.

    G. ASTM D2000: Classification for Rubber Products.

    H. ANSI B16.1: Pipe Flanges and Flanged Fittings.

   1.04 DESIGN REQUIREMENTS

    A. Schedules: Gate types, sizes, operators and other pertinent operational data are indicated on Drawings.

    B. Maximum allowable leakage rate: 0.1 gpm per foot of perimeter in accordance with AWWA C501.

   1.05 SUBMITTALS

    A. Submit under provisions of Section 01300.

    B. Shop drawings: Indicate layout, general assembly, components, dimensions, anchor bolt setting, weights for each size and type of gate, operators, support details and materials of construction referenced to applicable standard specifications. Refer to Section 11951 for required motor data.

    C. Product Data: Include data sheets for each type and size of gate and operator combination.

    D. Manufacturer's written installation instructions.

   1.06 OPERATION AND MAINTENANCE DATA

    A. Submit operation and maintenance data under provisions of Section 01730.

   1.07 QUALITY ASSURANCE

    A. Gate manufacturer shall supply gates, operators and related appurtenances and be responsible for their compatibility.

   1.08 DELIVERY, STORAGE AND HANDLING

    A. Deliver to site, store, protect and handle gates under provisions of Section 01600.

    B. Protect gates and components from physical damage including effects of weather, water and construction debris.

   PART 2 - PRODUCTS

   2.01 FLAP GATES

    A. Manufacturers:

    1. Rodney Hunt Company, Orange, MA.

    2. Waterman Industries, Inc., Exeter, CA.

    3. Substitutions: Under provisions of Section 01600.

    B. Type: Series FV-AC-Rodney Hunt Company; Model P5-25F-Watermain Industries.

    C. Designed for combined sewage overflow.

    D. Materials:

    1. Body: Cast iron, ASTM A126-B.

    2. Resilient Seat: Neoprene.

    3. Flap: Cast iron, ASTM A126-B.

    4. Hinge Arms: High tensile bronze, ASTM B584-CA865.

    5. Hinge Pins: ASTM A276, Type 316 stainless steel.

    6. Anchor Bolts and Nuts: ASTM A276, Type 316 stainless steel.

    E. Flanges: Faced and drilled 125 lbs standard for wall thimble or pipe flange mounting.

    F. Resilient Seat: Bonded in a groove machined in body to provide a wide contact surface for the machined end cover.

    G. Flaps: Spherically dished design to withstand maximum operating loads.

    H. Hinge Pins: Designed in double shear.

    I. Hinge Arms:

    1. Two pivot points.

    2. Adjustable lower pivot with limited rotation and threaded upper hinge post to adjust flap gate sensitivity.

    3. One lubrication fitting supplied for each pivot.

    4. Anti-locking bar between hinge arms to prevent excessive rotation about lower hinge pin.

    J. Steel leaf spring attached to body and extended over cover limits travel of cover to 90 degrees from vertical during pump discharge operation. Provide a rubber pad at spring to cover contact point.

   2.02 SLUICE GATES

    A. Manufacturers:

    1. Rodney Hunt Company, Orange, MA.

    2. Waterman Industries, Inc., Exeter, CA.

    3. Substitutions: Under provisions of Section 01600.

    B. Sluice gates shall have rising stems and shall meet the requirements of AWWA C501.

    C. Materials:

    1. Body: Cast Iron, ASTM A126 Class B.

    2. Seating Faces: Bronze, ASTM B584.

    3. Fasteners: ASTM A276, Type 316 stainless steel.

    4. Stems: ASTM A276, Type 316 stainless steel.

    5. Wedges, Thrust Nut, and Lift Nut: High tensile bronze, ASTM B584-CA865.

    6. Wedge Seats: ASTM A276, Type 304 stainless steel.

    7. Anchor Bolts and Nuts: ASTM A276, Type 316 stainless steel.

    D. Gates intended for modulating service shall have nylon lift nuts and stems, and seating surfaces shall have a finish of 63 microinches or better.

    E. Type of closure, frame, and wall thimble, and operating heads shall be as indicated on Drawings.

    F. Sluice gate operators shall be manual, electric motor, or cylinder as indicated in the gate schedule and shall meet the requirements of AWWA C501.

    G. Manual operators shall be equipped for operation by a portable electric operator.

    H. Design: Liberal factors of safety shall be used throughout the design and especially in the design of parts subject to intermittent or alternating stresses. In general, the working stresses shall not exceed one third of the yield point or one-fifth of the ultimate strength of each material. The gates shall be designed to fit into the structures as shown on the Drawings.

    I. Anchor Bolts: Anchor bolts shall be furnished by the gate manufacturer. Anchor bolts shall be of the hooked end type. Each anchor bolt shall be provided with two nuts and sufficient thread to permit one of the nuts to be installed on the concrete side of the form or template.

    J. Standard Sluice Gates: Standard sluice gates shall be heavy duty, upward opening, rising stem, cast iron sluice gates. These gates will be used to control the flow of sewage and will be normally fully open or fully closed.

    K. Frames: The gate frames shall be of a heavy pattern, cast iron construction. Gate frames shall be "U" shaped cross section ample to prevent distortion and shall be provided with front and rear flanges. The frame shall be completely through-drilled to allow anchor bolts to be tightened from the front in those locations where side and bottom clearances are limited. All joint surfaces and bearing areas shall be machined. Seat facings shall be suitably expanded under heavy pressure into dovetailed grooves machined in the frame.

    L. Side Guides: Side guides shall consist of heavy iron castings of such length that at least one half of the gate leaf remains within the side guides when the gate is fully open. A machined shot shall be provided for the entire length of each guide to engage a tongue on the gate leaf. The guides of self-contained gates shall have extended tops provided with pads for mounting of the yoke. These pads shall be machined to a plane perpendicular to the movement of the gate slide. Side guides shall be reinforced with heavy ribs at the points of contact with side wedges. Guides shall be designed to withstand all hydraulic and wedging stresses. Wedge seats shall be securely attached to the guides.

    M. Gate Leaves: The gate leaves shall be made of cast iron adequately reinforced with stiffening ribs to withstand the full differential seating and unseating heads without distortion. Each gate shall be provided with machined tongues to engage the guides on each side extending the full length of the leaf. Each leaf shall be provided with a heavily reinforced socket to receive the stem terminal nut. Construction of the socket shall be such that the terminal nut can be keyed to the stem after the stem has been screwed into the nut.

    N. Wedges: Adjustable wedges of hardness sufficiently different than that of the wedge seats in the side guides to prevent galling when in contact shall be provided on each gate leaf. The number of wedges shall be as recommended by the manufacturer of the gate, except that not less than two wedges shall be provided on each side of the gate. Each wedge shall be securely attached to the gate leaf and shall be equipped with an adjusting bolt and lock nut.

    O. Yoke: Self-contained gates shall be provided with a cast-iron or structural steel yoke designed for the thrust of the floor-stand or hoist with a safety factor of five. The top of the yoke shall be machined to receive the operating mechanism. The pads on the yoke that contact those on the top of the guides shall be machined on contact faces and bolted to the guides to take the thrust developed under maximum operating conditions.

    P. Wall Thimbles: Wall thimbles shall be furnished for all sluice gates that are not attached to pipe flanges. Wall thimbles shall be section "F", "E", or mechanical joint. The depth shall be as indicated on the Drawings and listed in the gate schedule. They shall be cast iron, one piece construction, of adequate section to withstand all operational and reasonable installation stresses. Wall thimbles shall be internally braced during concrete placement. A center ring or water stop shall be cast around the periphery of the thimble. The front flange shall be machined and have tapped holes for the sluice gate attaching studs and metal stamped vertical centerlines with the word "top" for correct alignment. Wall thimbles shall be provided with holes in the invert to allow air escape during concrete placement beneath the thimble. A permanent gasket of uniform thickness or suitable mastic shall be provided between the sluice gate and wall thimble.

   2.03 STOP LOGS GROOVES.

    A. Provide aluminum stop logs grooves as shown on Drawings.

    B. Manufacturers:

    1. Rodney-Hunt Company, Orange, MA.

    2. Substitutions: Under provisions of Section 01600.

    C. Materials:

    1. Guides: Aluminum B308 6061-T6.

    D. Design:

    1. Guides:

    a. Structural shapes or formed plates.

    b. Maximum rigidity with strap on the back for embedded type to lock it into the concrete or with a side angle for surface mounting using anchor bolts.

    c. Frame invert angle or channel is welded to the lower ends of the guides to form a sealing surface for the resilient seal mounted on the disc.

   2.04 SPECIAL GATE OPERATORS

    A. Electric Gate Operators:

    1. Manufacturers:

    a. Limitorque Corp., Lynchburg, VA.

    b. Substitutions: Under provisions of Section 01600.

    2. Operating Stands: Mount electric operator drive unit on a heavy pattern operating stand designed to transfer the thrust to the concrete floor. Anchor Bolts and Nuts: ASTM A276, Type 316 stainless steel.

    3. Drive Units:

    a. Mount motor vertical or horizontal above the gear unit. Enclose in NEMA 4 housing: Motor, gearing, mechanism, handwheel mechanism, limit switches, lubricants, heating elements, wiring and terminal facilities.

    b. Gearing: Design for 100 percent overload, permanently lubricated, and effectively sealed against entrance of foreign matter.

    c. Reduction Gear Ratio: Construction to permit the reduction gear ratio to be changed, if required.

    d Handwheel: Instantly disengages when drive unit is energized. Drive unit rotor will not turn during handwheel operation.

    e. Drive unit: Responsive to electrical control at all times.

    4. Motors:

    a. Motors shall be high torque, low starting current design made expressly for gate control service, capable of operating the gate for at least three cycles of travel without overheating.

    b. Type L4-3. Refer to Section 11951.

    c. Motor bearings shall be permanently lubricated.

    d. Design motor so that the motor comes up to speed before the stem load is encountered in either the opening or closing mode of operation.

    5. Torque Limit Switches:

    a. Limit torque and thrust loads during operation.

    b. Provide with micrometer adjustment and reference setting indicator.

    c. Micrometer adjustment to permit a variation of approximately 40 percent in the torque setting.

    d. Torque switch Contacts: Rated for 5 amperes at 240 volt AC.

    e. Provide four trains of geared limit switches, each train independently adjustable and with provisions for four switch contacts.

    f. Provide operator with two limit switch assemblies.

    6. Provide space heating elements sized to prevent condensation in both the motor and the geared limit switch compartment. Heating elements: Rated for 120 volt AC.

    7. Provide terminal facilities for connection to motor leads, switches and heating elements in the limit switch compartment.

    8. Visual Gate Position Indicators:

    a. One for each gate installation.

    b. House indicator in a NEMA-4 enclosure with a condensation proof plastic read-out window. Indicator read in percent open for 0 to 100 percent.

    9. Control Modules:

    a. Type: Electronic solid state.

    b. Mounted within operator housing.

    c. Contains reversing motor starter with motor overload protective device; a control power transformer for controls; and space heaters.

    d. Provide operator with a slide-wire type position feedback potentiometer which provided a position feedback signal to the control module. Provide feedback potentiometer with anti-backlash gearing or operate directly from the weir shaft as required to minimize hyteresis.

    e. Provide operator with "Open, Close and Stop" momentary contact pushbuttons on the operator housing for local electric operation in the manual mode. Pushbuttons: Heavy-duty, oil-tight, with rubber boots.

    f. Modulating Operation:

    i. Control module accepts a standard 4-20 mA dc analog input signal with a load impedance of not greater than 400 ohms.

    ii. Provide "loss of signal" detection circuit which causes the gate operator to hold its last position upon loss of the 4-20 mA dc control signal.

    iii. Gate Operating Control Systems: Refer to Section 13320.

    g. Provide "Manual-Off-Automatic" selector switch on the operator housing.

    B. Portable Operators:

    1. A portable electric operator shall be furnished for each type of operating gate. Operators shall have heavy duty electric power drives with forward-reverse and control switches. Operators shall engage and drive the circumference of adapters. They shall include overload release devices of the adjustable, spring-loaded, drive pawl type. Support brackets shall be provided to support the portable operators at points designated by the Engineer.

    2. Portable operators shall develop a momentary torque of at least 2-1/2 times the operating torque required for operating the largest gate. Motors shall be rated for 115 volt, single phase, 60 hertz operation, and be equipped with 3-wire, type S.O. cords, with armored caps. Four 50-ft heavy duty extension cords shall be furnished with the operators.

   2.05 FLOORSTANDS

    A. Furnished by gate manufacturer.

    B. Crank-operated type with either single or double gear reduction depending upon lifting capacity required. Provide with threaded cast bronze lift nut to engage operating stem. Tapered roller bearings above and below flange on operating nut to support both opening and closing thrusts. Floorstands to operate at rated capacity with not greater than 40-lb. pull on crank or hand wheel. Gears, where required, of steel with machined cut teeth designed for smooth operation. Pinion shafts on crank-operated floorstands, either single or double ratio, supported on tapered roller bearings or other approved bearings. All components totally enclosed in cast-iron case and cover. Positive mechanical seals on operating nut and pinion shafts to exclude moisture and dirt and prevent leakage of lubricant. Lubricating fittings for lubrication of all gears and bearings. Floorstands having cast-iron pedestal with input shaft or hand wheel, arrow with word OPEN.

    C. Provide clear, transparent, rigid, plastic stem covers for rising stem gates.

    D. Provide floorstands to be used with portable operators with removable hand wheels or cranks.

    E. Anchor Bolts, Washers and Nuts: ASTM A276, Type 316 stainless steel.

   2.06 SHOP FINISHING

    A. Clean and shop prime gates under provisions of Section 09915.

    B. Coordinate shop coats with finish coats. Finish coats may be applied at factory if recommended by gate manufacturer.

    C. Apply a heavy shop coat of grease or other suitable rust resisting coating to bearing surfaces and other surfaces not to be painted.

   2.07 SOURCE QUALITY CONTROL

    A. The completely assembled gate shall be shop inspected for proper seating. Seat facings shall be machined and wedges adjusted to exclude a 0.004-inch thickness gauge between the frame and disc seating surfaces. The gate disc shall be fully opened and closed in its guide system to insure that it operates freely. Floorstands and benchstands shall operated to insure proper assembly and operation.

    B. All work shall follow the best modern practice in the manufacture of high-grade machinery. All parts shall be manufactured to standard sizes and gages so that repair parts, furnished at any time, can be installed in the field without any fitting, chipping, or re-machining. Like parts shall be interchangeable. The gates shall be completely assembled in the shop to insure that all parts fit together properly.

   PART 3 - EXECUTION

   3.01 INSTALLATION

    A. Anchor bolts and wall thimbles for each gate shall be carefully set to template before concrete is placed.

    B. Installed gates in accordance with manufacturer's instructions and adjust gates to not lean or bind.

    C. Apply finish paint system under provisions of Section 09915. Touch-up damaged finished surfaces.

    D. Stems shall be installed in proper alignment.

    E. Operators shall be accurately set and plumbed and shall be in proper alignment with the gate and stem before it is grouted in place.

    F. Bolts shall be tightened and all items requiring lubrication shall be lubricated.

    G. Provide for connection of electric gate operators to electrical service. Refer to Section 16010.

   3.02 FIELD QUALITY CONTROL

    A. Perform field inspection and testing under provisions of Section 01400.

    B. Manufacturer's Field Services: Furnish factory-authorized service representatives to inspect gates and operators during installation, to assist in adjusting and testing, to supervise initial operation and to make final adjustments as necessary to ensure satisfactory operation.

    C. Minimum Length of Field Services:

    1. Slide Gates: 2 trips; 2 days per trip.

    2. Butterfly Gates: 2 trips; 2 days per trip.

    3. Sluice Gates: 2 trips; 2 days per trip.

    4. Adjustable Weir Gates: 3 trips; 2 days per trip.

    5. Electric Gate Operators: 3 trips; 3 days per trip.

    D. All field service time is exclusive of travel time.

    E. Test gates in the presence of Engineer to verify specified leakage rates.

    F. Furnish labor, equipment and materials for conducting tests.

   3.03 COMMISSIONING

    A. Start-up and commission electric operating gates under provisions of Section 01650.

   3.04 DEMONSTRATION

    A. Perform electric operating gate demonstrations and furnish instructions to Owner's personnel under provisions of Section 01650.

    B. Equipment demonstrations and instructions are in addition to the Manufacturer's Field Services specified in Article 3.02.

    END OF SECTION