Guide Frame shall extend beyond the invert at least ¾ of the distance of the gate travel. Weir gates shall be embedded or mount to the concrete with epoxy anchors. Anchor hardware shall be supplied by the gate manufacturer. Epoxy shall be supplied by the installing contractor following the recommendations of the gate manufacturer. No wall thimbles shall be required for installation. Lifts & Operators Operators shall be sized to start the gate moving under a maximum head pressure with a pull of not more than 40 lbs. (2.8 ksc). A manual hand wheel or crank shall be supplied that is compatible with the lift. The direction of operation shall be clearly and permanently identified on the lift. Electric Operators (OPTIONAL) Gate Manufacturer shall provide actuators per Electric Motor Operator Manufacturer’s recommended sizes based on Operating Forces and design requirements and shall be for open/close / modulating service. Operating Stems Each weir gate be equipped with a operating stem. The stem shall be The use of non-rising stem gates shall be restricted to applications where there is no practical alternative. 2. Stems will have roll formed Acme threads to enhance thread strength and provide a smooth surface finish. Stems shall be provided with two adjustable stop collars to limit upward and downward travel. Stems shall have a maximum L/R of 200. Stem guides with UHMW bushings shall be used to maintain an L/R of 200. 5. Stem shall be design to transmit in compression without buckling the thrust developed by an 80 pound rimpull. Where applicable, the stems shall also be designed to transmit in compression without buckling the thrust developed at 1.25 times the rate stall torque of the electric actuator. Where interconnected hoists are used each stem shall be deigned assuming all the load is transmitted by one stem. Euler’s column buckling formula shall be used assuming an end condition of 2. Stem Covers Transparent plastic stem covers shall be provided with vent holes to minimize condensation. The stem covers shall be marked with `Open’ and `Closed’ position indicators. Pedestals For non-self-contained guide frames a pedestal shall be furnished for mounting the operator. Pedestal material shall be 2.05 Structural characteristics for a 1/8” (3mm) mat laminate shall meet the following minimum physical properties:
Guide Frame shall extend beyond the invert at least ¾ of the distance of the gate travel. Weir gates shall be embedded or mount to the concrete with epoxy anchors. Anchor hardware shall be supplied by the gate manufacturer. Epoxy shall be supplied by the installing contractor following the recommendations of the gate manufacturer. No wall thimbles shall be required for installation. Lifts & Operators Operators shall be sized to start the gate moving under a maximum head pressure with a pull of not more than 40 lbs. (2.8 ksc). A manual hand wheel or crank shall be supplied that is compatible with the lift. The direction of operation shall be clearly and permanently identified on the lift. Electric Operators (OPTIONAL) Gate Manufacturer shall provide actuators per Electric Motor Operator Manufacturer’s recommended sizes based on Operating Forces and design requirements and shall be for open/close / modulating service. Operating Stems Each weir gate be equipped with a operating stem. The stem shall be The use of non-rising stem gates shall be restricted to applications where there is no practical alternative. 2. Stems will have roll formed Acme threads to enhance thread strength and provide a smooth surface finish. Stems shall be provided with two adjustable stop collars to limit upward and downward travel. Stems shall have a maximum L/R of 200. Stem guides with UHMW bushings shall be used to maintain an L/R of 200. 5. Stem shall be design to transmit in compression without buckling the thrust developed by an 80 pound rimpull. Where applicable, the stems shall also be designed to transmit in compression without buckling the thrust developed at 1.25 times the rate stall torque of the electric actuator. Where interconnected hoists are used each stem shall be deigned assuming all the load is transmitted by one stem. Euler’s column buckling formula shall be used assuming an end condition of 2. Stem Covers Transparent plastic stem covers shall be provided with vent holes to minimize condensation. The stem covers shall be marked with `Open’ and `Closed’ position indicators. Pedestals For non-self-contained guide frames a pedestal shall be furnished for mounting the operator. Pedestal material shall be 2.05 Structural characteristics for a 1/8” (3mm) mat laminate shall meet the following minimum physical properties:
Downward-Opening-Weir-Gate-Specs.docx