1. Electromechanical Equipment DBM at Osaka Municipal Waterworks Bureau’s Kuzuha Intake Station
The Osaka Municipal Waterworks Bureau’s Kuzuha Intake Station established in 1968 is capable of passing 450,000 m3 of water each day. It intakes raw water from the Yodo River, and after passing it through a settling basin, uses intake pump equipment to transfer it to the Toyono Water Purification Plant 15 km away, which supplies the eastern and central parts of Osaka with tap water.
The time had come to update the intake pump equipment, monitoring and control equipment, and other machinery at the Kuzuha Intake Station, and the need for preparing a private power generator facility as a countermeasure in case of a prolonged power outage was urgent. To this end, the Osaka Municipal Waterworks Bureau decided to simultaneously implement the updates to major electrical systems and machinery, including construction of the private power generator facility and the new building to hold it in an efficient and economic manner using the unified design, build, and maintain (DBM) method. The detailed design and construction of a wide range of electrical systems, machinery, and architecture are now complete, and the facility has entered the operation and maintenance. The business overview and effects are described below.
- Project overview
- Update of intake pump, electric motor, rotational speed controller, and other intake pump and monitoring and control equipment, construction of architectural structures for housing private generator equipment to run the facility, and the operation and maintenance of equipment updated and newly constructed as a part of this project
- Overview of major equipment specifications
- Intake pump equipment: double suction horizontal shaft single-stage volute pumps (4)
Aperture 1,000 mm (horizontal suction) × 700 mm (horizontal discharge), regulated discharge amount of 125 m3/minute - Private generators: gas turbine engine, rated output of 3,457 kW or higher (2)
Synchronous generator 3φ3 W 6.6 kV, rated output 4,000 kVA (2) - Monitoring and control equipment: Centralized monitoring and control of Kuzuha Intake Station using a liquid crystal display (LCD) monitoring and control device and controller
- Intake pump equipment: double suction horizontal shaft single-stage volute pumps (4)
- Benefits of the DBM method
- The method ensured consistency in the electrical systems, machinery, and housing architecture that were the focus of this project’s work, ensuring the construction of a highly reliable system that will operate in a smooth and unified fashion.
- On-site construction was achieved during continuous operation of the intake facility while configuring and arranging the updated equipment with consideration given to the streamlining of updating and removal work.
- Formulation of a concrete operation and maintenance plan starting at the detailed design stage enabled equipment selection and construction that gave consideration to economic efficiency as well as operability and maintainability.
[01]Intake pump equipment (left), private generator equipment (center), LCD monitoring and control device (right)