Lineshaft Pumps
Diesel Electric Genset with Lineshaft-driven Pump and Dry-mounted Electric Motor
A flexible, high-performance fire water pump solution built for offshore environments. The system consists of a vertical end-suction, multistage centrifugal pump driven by a lineshaft and dry mounted electric motor. The motor is powered by a dedicated diesel generator set, forming a compact and fully self-contained fire water system for offshore installations.
The entire system is powered by a dedicated diesel generator set and designed as a self-contained unit in compliance with NFPA 20 standards.
Main Features & Benefits
- Flexible fire water solution
- Self-contained system customized to meet client specifications and compliant with IMO, SOLAS and NFPA 20
- Skid-mounted or containerized in A60/H60 enclosures for safe or hazardous areas
- Maintenance elements i.e. motor is topside
- Customized control system, engineered inhouse reduces generator and engine sizing
- Water on deck in under 15 seconds
- Start-up with water-filled risers to avoid water hammer
- Combined solution for FW and Essential duty possible
- No length limitations – suitable for installations over 50 meters
- Optional integrated non-return valve prevents water hammer and enables hypochlorite injection
Description
The system consists of a vertical end-suction, multistage centrifugal pump driven by a submerged, water-glycol filled electric motor. The motor is powered by a dedicated diesel generator set, forming a compact and fully self-sufficient fire water system for offshore installations.
The pump is API 610 compliant and designed for continuous duty under all environmental conditions. Rotor forces are dynamically balanced to ensure long bearing life and eliminate material fatigue. The submerged electric motor features insulated water-glycol-filled windings, preventing short circuits even in the event of seawater ingress.
An integrated mechanical seal and thrust bearing are housed inside the motor. There is no thrust bearing in the pump itself – all axial loads are carried by the motor bearing. The system is delivered with a control system, fully NFPA compliant, PLC-based with multiple functions, engineered for simple interface with the SAS system.
Learn More About Our Lineshaft Pump
Explore Our Generator Set Configuration
Cooling water for diesel engines and generator is provided from the fire water pump, fed to the genset through a Sea Water Harness loop to ensure correct pressure and flow. The seawater harness is fitted with t-strainers to protect the plate heat exchangers from water-transported contaminations.
Heat exchangers for jacket water, turbo after cooler and fuel return are installed on skid.
A Jacket Water heater and circulation pump will keep the diesel engine warm during stand still to give an easy start up. Further, an electric lubrication pump will operate before test starts and after each shutdown in order to reduce wear and tear for the engine.
The engine start system can be either electric (24VDC), pneumatic or hydraulic and shall have a primary and backup function. The most common solution is a dual electric start system with either pneumatic or hydraulic backup.
The genset is equipped with a fuel tank designed to support operation for 12, 18, or 24 hours, or according to project-specific needs.
A local control panel (LCP) will monitor and control the whole system. The LCP is completed with required instrumentation and control system either as an independent package or fully integrated into the Safety and Automation System (SAS). An easy-to-use touch panel is mounted in front of the LCP for local operation and monitoring
The system offers two operational modes: test mode and fire mode. In test mode, multiple alarms will cause the engine to stop, while in fire mode, a shutdown will only occur in the event of engine overspeed or a short circuit in the generator output.
The generator is water cooled, also fed from the fire water pump. An electric circulation pump will circulate the water through the generator heat exchanger in order to maintain the operating temperature within limits.
The diesel electric fire water pump system gives flexible installation as the genset can be installed remote from the pump thus located in safe area while the motor/pump can be located in hazardous area if required. The system is designed to comply with the latest edition of NFPA20 with easy access to all maintenance areas. All units will be full load tested prior to delivery at Eureka’s state of the art test center.
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.
