Lineshaft Pumps
Diesel Direct Driven Deepwell Pump Powered through an Angle Gear
Direct driven solutions ”The most reliable offshore fire water pump system today”.
A space- and cost-efficient fire water pump system engineered for offshore and industrial applications. The vertical lineshaft configuration combined with a right-angle gear and direct diesel drive offers a fully mechanical, robust, and reliable solution in accordance with NFPA 20 and API 610 standards.
Main Features & Benefits
- The most reliable offshore fire water pump system today
- Fully mechanical NFPA 20-compliant design for offshore fire protection
- Compact and lightweight configuration with minimal system components
- No power limitations — adaptable to various duty requirements
- High efficiency combined with low start-up excess power requirements results in lower driver power requirements
- Cool-down sequence enhances diesel engine longevity
- Easy alignment and installation
- Suitable for Hazardous Area Zone 2
- Sleeve bearings with excellent dry-running startup performance
- Submerged non-return valve available.
- API610-based shaft bearing spacing and subcritical speed operation
- Fuel-efficient operation with reduced exhaust emissions
- Skid-mounted or containerized in A60/H60 enclosure for safe or hazardous design
Description
The system consists of a vertical end-suction, multistage centrifugal pump driven by a high-speed, direct injection turbocharged diesel engine. Power is transmitted via a right-angle gear to the lineshaft pump. The system is entirely independent of external cooling systems, drawing cooling water from the pump discharge.
The pump is designed in accordance with API 610 and NFPA 20, ensuring full compliance with offshore safety standards. Journal shaft bearings are spaced according to API 610 requirements, and pump speed is maintained below 75% of critical speed. All wetted surfaces are constructed in seawater-resistant materials, such as 22% Cr Duplex, 25% Cr Duplex, or Ni-Al Bronze.
The labyrinth sealing system is non-contact, giving it the same lifetime as the pump, and sleeve bearings offer excellent dry-start performance. A submerged non-return valve can be included to eliminate water hammer during startup. Eureka has experience delivering systems with pump lengths exceeding 50 meters.
Learn More About Our Lineshaft Pumps
Angle Gear
- Type: Right-angle gear, NFPA 20-compliant
- Design: Hollow shaft with flexible coupling to pump shaft
- Features:
- Integrated non-reverse ratchet
- Internal lubrication system for bearings and bevel gear
- Adjustable impeller vertical position post-installation
Pump Non-Return Valve – Deep Well Fire Water Applications
- Diesel direct driven deepwell pump with angle gear (caisson mounted)
- Diesel electric genset with deepwell pump (submerged electric motor)
- Diesel electric genset with deepwell pump (lineshaft and dry mounted electric motor)
The fire water pump application requires the pump to start up as fast as possible during a fire emergency, which can result in water hammer damaging the equipment. The problem normally starts at a capacity above 1000m3/h. In order to minimize the water hammering at the pump bend during start-up, a submerged check valve arrangement can be installed at the bottom of the riser column on the pump end discharge.
The NRV is available in both submerged electrical and lineshaft pump solutions.
Hypochlorite can be injected from the top unit due to the small leakage through the valve, which eliminates the need for a separate hypochlorite line.
During start-up, the increase in pump medium pressure will push the valve piston spring and open the valve.
The NRV principle has been in successful service for more than 20 years.