The pump bowls are of the diffusor type. Each diffusor has an outlet flange screwed to the next diffusor or first riser column. Together with the riser columns and discharge bend on deck, they are designed for the required working pressure.
The riser columns bring the pumped fluid up to deck level. Each column is a flanged pipe, which supports the shaft journal bearings through spider bearings at each flange connection.
As standard discharge nozzle is supplied with a 150 lbs ANSI B16.5 flange with a 1/16″ raised face.
Pumps can be furnished with other flange ratings and facing upon request. Standard orientation is horizontal.
Suction nozzle is normally submerged into a basin or fluid filled caisson. As an option pumps can be delivered with a bucket around the pump unit, making it possible to connect the pump inlet to a pipeline.
Labyrinth seal with back up seal arrangement are fitted in deck head (discharge bend).
The shaft which is machined and ground to required dimensions, is of ample size to transmit the required power and prevent excessive deflection.
The drive shaft is enclosed in the riser columns. Several intermediate shafts connected by sleeve couplings, transmit power to the pump unit. Each shaft is normally two times the column section length. This means that each shaft is supported by two journal bearings. As an option, shaft length can be made equal to column length if the dismantling height on deck is limited.
The impeller is single suction and designed with a large eye area to ensure low NPSH requirements and thus reduce the possibility of cavitations. The impeller is fitted with wear rings
Casing wear rings
The casing wear rings are inserted in the pump bowl with a slight interference fit and secured with a hollow head setscrew.
Long shaft pumps have a throat bushing fitted in the deck head to minimize leakage around the shaft. This can be a straight sleeve or a labyrinth seal. Both solutions ensure low pressure on the back up seal or mechanical seal.
Shaft sleeves are keyed to prevent rotation and are axially secured between impellers and shaft lock nut. Thus securing the impellers in the correct axial position, as well as protecting the shaft from wear under the bearings in the pump unit. As an option, the intermediate shafts can also be delivered with protective sleeves under the journal bearings in the riser.
O-ring type gaskets are provided between the pump bowls, column risers and deck head, which allows metal to metal assembly ensuring correct fit.
Axial thrust is taken by a thrust bearing in angle gear. Oil lubricated anti-friction thrust bearing is used.
Journal bearings in riser and pump unit are of the product lubricated sleeve type. Normally these bearings are of impregnated carbon with excellent dry running capabilities.
The gear is designed according to NFPA20. Right angle gear unit with bevel set, equipped with hollow output shaft to fit pump shaft. The gear unit will be delivered with special construction for vertical adjustment of the pump shaft ±10 mm. The gear unit will be designed to take axial thrust and weight of rotor assembly. The gear unit will be delivered with anti-reverse feature mounted on the output shaft. Material is offshore painted carbon steel.
Diesel Driver w/Auxiliaries
Diesel engines used in Eureka systems are designed to operate in an offshore/marine environment. The diesel engine is skid mounted, coupled with the driven unit. For each project diesel engines are selected to meet the specified power requirements of the driven unit, be it a generator or a direct driven pump.
Control panels for the diesel driven contain all components and functions necessary for self contained operation, monitoring and protection of the system. The main components typically included in the cabinet are batteries used to power the control panel in case of loss of power from the installation, battery chargers, generator protection equipment (if generator is part of the package), a touch panel in the door to operate and monitor the system locally, and a PLC. The make of PLC can be altered from the Eureka standard to adapt to the SAS system of the installation. Cabinets are IP55 as standard.
Diesel day tanks are specially designed for each project, and even for each single diesel engine if this is required by space limitations, room or container configurations etc.
Where there is a requirement to maximum temperature of the exhaust gas, Eureka may supply exhaust coolers. The temperature of the exhaust gas from the diesel engine is normally 400-450degC, and the exhaust cooler typically decreases the temperature to below 200degC. The cooling circuit is normally closed loop water/glycol with an electrically driven circulation pump powered by the generator.
The exhaust cooler is Eureka’s own design and meet the offshore requirements with regards to welding, material, surface treatment and documentation. The exhaust cooler is equipped with separate connection points for differential pressure and temperature transmitters, and instruments may be ordered as an option.
All on-skid piping will follow Norsok piping specification