East Alligator district centre water supply assessment : Kakadu National Park
D . Pidsley
Jamieson, M.; Pidsley, D.; Paiva, Jerome
E-Publications; E-Books; PublicationNT; Technical Report ; 26/1991
Made available via the Publications (Legal Deposit) Act 2004 (NT).
Water-supply -- Northern Territory -- Kakadu National Park; Groundwater -- Northern Territory -- Kakadu National Park; Kakadu National Park (N.T.)
Power and Water Authority
Technical Report ; 26/1991
1 v. : ill., maps ; 30 cm.
Check within Publication or with content Publisher.
Technical Report WRD91026 Viewed at 15:07:48 on 29/07/2010 Page 17 of 107. 2.1.4 Booster PUl!!Wi Two Grundfos Type CH4-40 booster pumps with pressure tanks operate in parallel from the 45 kL s,nd in a lead-lag relationship at 49 kL tanks near the ranger the outlet house. A schematic of the pipework associated with these pumps is shown in Diagram 3. The operational characteristics of these pumps is shown in Appendix 3. These pumps when manufactured were set up in such a way so that they would sustain the pressure at the pump above 170 kPa, and to switch off when the pressure reached 320 kPa. These se,ttings can be changed however, and it is not known if this has happened. Initially, only one of the pumps will cut in (when there is draw off in the pressurised part of the system) , but the second pump will only operate if the first pump is not able to supply sufficient pressuri:!: (to keep pressure above 170 kPa) , and so the pumps then operate in parallel. There is another booster pump in the system next to the 60 kL tank. It is a Southern Cross REA pedestal mounted booster pump run by a diesel Lister motor. It is not known what size impeller is in this pump or at what speed the motor will drive it, so pump perfol:mance is difficult to predict. This booster is used to pump water from the 60 kL tank to the 9 kL tank and Merl 1 ablutions block, or to pump water back to the 45 kL and 49 kL tanks near t::J.e ranger houses. This booster is usually not used. 2.1. 5 Other Feat'Jres of the system The main production bores, RN 23499 and RN 23450 are powered by an 8 KVA diesel generator, situated about 30 m from these bores, adjacent the decommissioned bore, RN 20637. This generator can only operate one s'.lbmersible pump at a time as the start up load of an additional pump would be beyond its capacity. The generator is start'ad manually and this runs the submersible, pump down the bore. There are check valves operated by float switches on the inlets of the 45 kL and 49 kL tanks which close when these tanks are full and so stop flow from the bore. A no flow switch at the bore head then activates and the bore and generator are turned off. 005MJ