North Sea successes for Waukesha and Pulsafeeder pumps
01 June 2008
AxFlow Aberdeen has been expanding its reputation and business in the North Sea oil and gas industry, winning orders for pump units to be used on a Produced Water Package (PWP). The PWP comprises the Opus Compact Flotation technology with Mare’s Tail skid, motive water skid and reject collection skid and its primary role is to treat produced water prior to its disposal overboard.
AxFlow Aberdeen’s role has been to supply the motive water and reject return pumps and design and build a chemical injection package.
The contract for the motive water and reject return pumps was placed by Opus Maxim and covered the supply and factory acceptance testing (FAT) of four API Waukesha positive displacement rotary pumps for the produced water handling package. The compact flotation units (CFUs) provide effective removal of small oil droplets and other compounds from produced water, which proves to be difficult when using traditional gravity based methods. Two 320U2 reject return pumps capable of delivering 46.4m_/h were selected along with two 420U1 motive water pumps capable of delivering 66.2m_/h. Both of these ATEX certified pumps were fitted with an API 682 double mechanical shaft seal system. They have 37kW electric motors, drive and flexible coupling all mounted on a carbon steel base plate. The variable speed drive for the pumps was provided using four ABB ACS 800 frequency inverters.
The DeOiler Chemical Injection Package, designed and built by AxFlow, is required to improve the clarity of the produced water on the PWP in order to meet governmental specifications for overboard discharge. The pumps specified for this duty were three Pulsar 25HJ (Duty) and one Pulsar 25HJ (Standby) diaphragm metering pumps. The unit was supplied with a 750 litre working capacity day tank and instrumentation unit containing flow meters, check valves and relief valves.
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