Stop Gates and Lifting Beams
Stop Gates and Lifting Beams Intake Dewatering and Maintenance
WTR® Stop Gates and Lifting Beams are an essential component to support dewatering of intake structures for maintenance, inspection, or isolation. Stop gates, also called stop logs, are used in all types of applications where maintenance under dry conditions is required, inspection of the structure is necessary, or a flow stream needs to be isolated.
Unlike sluice or slide gates, stop gates are unique. In lieu of being “fixed” and subjected to constant submergence and corrosion, which is common with sluice and slide gates, stop gates are stored above the water. Since most raw water intakes do not require frequent dewatering, stop gates are utilized only when required.
WTR Stop Gates are designed to provide superior sealing of intakes via a dedicated guide location and installation process. Our multi-stage guide embedment process during construction of the intake assures proper fit and mating of the gates with the guides. Gates are installed with the water balanced on either side. When dewatering of the intake begins, the “on-seating head” will create a tight seal providing minimal or no leakage.
WTR Stop Gates are also designed to work in conjunction with a dedicated lifting beam, which allows for controlled engagement and disengagement of gate sections. This eliminates the need for divers in the water to connect and disconnect gate sections during insertion or removal. When inserted in the guide slot, the bias of the lifting beam will not allow disengagement of a gate section until properly seated, as confirmed by a sensing rod. When placed in the opposite bias, the lifting beam will engage with the uppermost gate section for extraction.
Stop gates can be supplied in single piece / full height configurations, multiple sections to reduce overhead lifting height, or apron wall design to minimize gate height and quantity. Other options include balancing valves, dual direction guides, access ladders, and above or below deck storage racks.
WTR Engineering, LLC, is a wholly owned subsidiary of WesTech Engineering, as of April 1, 2017. WTR designs and supplies mechanical water filtration equipment, such as raw water and wastewater screening for large flows, for both the municipal and industrial markets, including the power industry.
Benefits and Features
- Stop gates are built to site specific conditions, typically from 3ft. (1m) to 20ft. (6m) wide
- Gates are normally supplied in epoxy coated carbon steel; options for alternate materials are available
- Gates include side and bottom seals of high durometer neoprene for positive sealing
- Guides are available in 316L SS, Duplex, or Super Duplex, and should be included in the intake cathodic protection system
- Gate lifting beam accommodates submerged engagement and disengagement from gate sections
- Lifting beam operates in conjunction with sensing rod on gate to confirm seating prior to lifting beam disengagement
- Lifting beams are normally supplied in epoxy coated carbon steel; options for alternate materials are available
- Single piece / full height gates
- Multiple section gates to reduce required lifting height
- Apron wall design to minimize overall gate height and quantity of gates
- Balancing valves to allow for gravity refilling of intake
- Dual direction guides to accommodate sealing in either direction by reversing the gate
- Built in access ladders to allow for descending into the intake
- Storage racks located above the deck with access ladder or below the deck within a sump
- Each gate includes guidance rollers to prevent binding during insertion or removal under balanced water levels
- Designed for “on-seating head” to create an increasingly tighter seal to prevent leakage
- Guides located in a dedicated slot, installed in a multi stage process to assure positive fit with stop gates
- Electrical generating stations – fossil and nuclear
- Refineries and chemical facilities
- Pumping stations – flood control and irrigation
- Steel mills and industrial complexes
- Industrial raw water
- Potable drinking water plants