Electronic Data Collection and Analysis System
Yin Foo, Des; Foley, Margaret
E-Publications; PublicationNT; E-Books; Report ; 39/1992
1992-08-01
Made available via the Publications (Legal Deposit) Act 2004 (NT).
Date:1992-08
English
Power and Water Authority
Darwin
Report ; 39/1992
application/pdf.
Check within Publication or with content Publisher.
https://hdl.handle.net/10070/229024
https://hdl.handle.net/10070/673447
Technical Report WRD92039 Viewed at 15:07:17 on 29/07/2010 Page 37 of 192. trialled by th,~ Western Australia Water Authority (WAWA) was made available for comparison purposes. This equipment included two data loggers namely Data Taker 2000 and unidata star Logger, and two pressure transducers. These included a Platypus Sm and a Druck 20m unit. 3.3.3 Results 3.3.3.1 Pumped Bore Results (Helical Rotor pumps) Interference from both the pump motor and this particular pump type were found to contribute significantly to the pressures (and hence to recorded water levels) sensed by all strain gauge type transducers. The precise nature of the interference WetS not ascertained, however, it is likely to be related to shock emanating from pump or column instability, or stator /rotor contact reverberations resulting in microphonic responses. A simple experiment to replicate shock effects was performed whereby a transducer at constant depth was subject to external shock using a hammer impacting a drum. The instantaneously recorded pressure vIas indicated to vary significantly from the constant hydrostatic pressure. In the pumped bore, variations in pressure equivalent to + /-1. Sm water"lere recorded at one second intervals using the Mindata logger/transducer combination, resulting in the graph shown on Figure 3.6 of Logged Head Ivith Time. The graph was produced as a "screen dump" from the I DAT!<1AN I processor. This particular tes': was performed firstly at a number of different pumped rates while maintaining constant pump motor speed (by engaging each gear). The motor speed was then increased to obtain another range of pumping rates. The exercise demonstrated::he correlation of these parameters to the magnitude of "scatter".