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Ebara Engineering Review No.240

Development of the repair technology using the cavitation erosion resistance of fiber-reinforced plastic

by Hiroaki NAKAMOTO, Motohiko NOHMI, Keisuke HAYABUSA, Shuji HATTORI, & Xiaohui YANG

Pumps used in critical applications, such as water treatment plants and power plants, are subject to regular maintenance for long-term operation. In recent years, comparatively minor damage is often repaired using plastic repair materials with high workability; a wide variety of plastic repair materials are commercially available for various applications. Plastic repair materials are evaluated in terms of their workability, water resistance, chemical resistance, cavitation erosion resistance, wear resistance, and delamination strength. However, complete data of these parameters are not provided in manufacturer catalogs, and cavitation erosion resistance has not been quantitatively clarified. We conducted cavitation erosion tests on plastic repair materials. This study reports the results of examination of glass fiber-reinforced plastics (GFRP) with excellent cavitation erosion resistance.

Maintenance technology, Repair technology, Cavitation, Cavitation erosion, Glass fiber reinforced plastic, Plastic repair material, Cavitation erosion test, Cavitation erosion resistance

Energy saving pump series with premium efficiency (IE3) motors

by Yoichi NAKAMURA, Hiroki KIRYU, & Masaki WATANABE

Model LPS-E, LPD-E, and FSD-E energy saving pumps using premium efficiency motors for improved pump efficiency have been developed. These pumps are included in the “Save Energy Pump” series, which comprises energy saving standard pumps with premium efficiency motors. A combination of high efficiency hydraulic design and premium efficiency motor technology provides higher overall efficiency than conventional products, contributing to energy savings. The pumps also feature rust protection and high safety, and are interchangeable with conventional models in terms of installation dimensions.

Energy saving, Premium efficiency motor, Save Energy Pump, High efficiency, In-line pump, End-top pump, Standard pump, Hydraulic design, Cation electrodeposition coating, Safety measure

Combustion type gas abatement system Model G5-Dual

by Toyoji SHINOHARA, Makoto KASHIWAGI, Yasuteru AOKI, Toshiharu OCHIAI, & Kazumasa HOSOTANI

The combustion type gas abatement system Model G5-Dual has two waste gas abatement lines, allowing to maintain or to repair without interruption of waste gas abatement operations, and thus significantly reducing downtime. It also supports waste gas abatement at high gas flow rate by operating the two lines simultaneously. Accommodating up to 12 waste gas inlet ports, the system can adapt to up-to-date multi-chamber semiconductor manufacturing equipment.

Combustion type gas abatement system, Semiconductor manufacturing equipment, Downtime, Backup system, Waste gas inlet port, Waste gas abatement line, Toxic gas, Inflammable gas, Perfluoro compounds

Renewal of Shinkawa-kako Drainage Pump Station (First Report)

by Tetsuo TAKABE, Hiroyuki OSAWA, Sakae SHIMIZU, & Yoshio KUDO

The Shinkawa-kako Drainage Pump Station located in the Nishi-kanbara district, Niigata City, is one of the largest pump stations in Japan. The pump station is always exposed to seawater and subject to severe corrosion. With about 40 years having passed since the construction of the pump station, renewal of the facilities has been required. The renewal construction is extremely difficult because an ultra-large-scale tubular pump with concrete casing must be renewed during the limited period of the dry season each year, while maintaining the pumping capacity of the pump station. With Ebara’s know-how for renewal construction, however, the construction has proceeded smoothly. Various innovations and ideas have been adopted with focus on improving the on-site installation process for higher maintainability.
This first report summarizes the features of the pump station and the renewal construction design.

Drainage pump station, Renewal construction, Horizontal adjustable vane axial flow tubular pump, Concrete casing, Impeller, Underground structure, Dry season, Seawater, Corrosion, Maintenance

Applying of CFD Analysis to Countermeasures against Undesirable Vortices in a Pump Sump at the Reconstruction of Nukata Drainage Pump Station

by Fuminori ETO, Lingjia ZHAO, & Norihiko OWADA

An increase in the total capacity of the drainage pump station associated with its reconstruction may lead to formation of undesirable vortices in the pump sump. Thus, computational fluid dynamics (CFD) analysis has been conducted to examine countermeasures against such vortices. CFD analysis covering the balancing reservoir has found an optimal setup of vortex suppression devices, and its effectiveness has been determined through model testing. Since the setup of vortex suppression devices proposed in this study places a minimum burden on the existing underground structure and shortens the construction period, the study of vortices associated with the reconstruction has yielded breakthrough results. In the future, CFD analysis is expected to cover the entire portion of the study of vortices in the pump sump. This study provides a benchmark for advancement in the study of vortices.

Reconstruction, Drainage pump station, Pump sump, Balancing reservair, CFD analysis, Vortex, Countermeasures against vortices, Model testing

First Wind Tunnel Test Facility in India

by Sadayoshi TAKAHASHI, Hideaki FUEKI, Takamichi SONOBE, & Masashi KORETAKE

Ebara has delivered the first environmental wind tunnel to a Japanese company in India under an EPS (engineering, procurement, and supply) contract focusing mainly on facility design and equipment supply. The scope of delivery includes the general design of the aerodynamic wind tunnel/environmental installation (except for the building, measuring instruments, air conditioning facilities, and on-site construction) and the supply of equipment. A Göttingen type wind tunnel with high operational efficiency has been delivered; fillet type contraction nozzles have been used to ensure proper and adequate airflow around test objects. The fillet type contraction nozzles allow reducing the power consumption by 25% or more compared to our conventional Göttingen type wind tunnels. The main nozzle velocity has been increased by 4% or more by using performance data obtained from other recently delivered wind tunnels and incorporating design improvements. For the capacity of the wind tunnel delivered to India, the main nozzle (W2.9 m × H2.2 m) and the secondary nozzle (W2.05 m × H2.05 m) provide maximum nozzle outlet velocities of 136 km/h and 171 km/h, respectively.

Wild tunnel, Aerodynamic wind tunnel, Environmental installation, Nozzle lifter, Settling chamber, Contraction nozzle, Göttingen type wind tunnel, Boundary layer control (BLC) system, Airflow distribution accuracy, Power consumption reduction