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Yin Foo, Des; Foley, Margaret
E-Publications; PublicationNT; E-Books; Report ; 39/1992
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Power and Water Authority
Report ; 39/1992
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Technical Report WRD92039 Viewed at 15:07:17 on 29/07/2010 Page 63 of 192. strenqth of the cable needs to be determined to establish its maximum unsubffi'~rged capacity. This will be applicable in bores where deep water levels exist. Only subjective comment can be offered in relation to the cables' ~lOrkability at this stage. The standard unvented cable supplied is able to be coiled on a normal garden hose reel. 100m of cable is recommended as a maximum length to service most situations. flexible and heavier. vented cable is relatively less No particular disadvantage was percieved could be from this although permanent damage due to bending considered a potential problem. The efficiency and heat shielding requirements would need established if this type of transducer were to be used. venting to be Sydney water Board reports of corrosion problems (verb. COmIn. R. Masters and D. Evangelista) in these transducers needs to be c:~arified but appears to relate to electrolytic degradation. The effect of the "bubble" at the pressure diaphragm oriface of the transducer in percieved as a potential source of measurement instability or possible error. It has been reported that the air entrapped vlill "dissol veil after two to three days. In the test pumping context, this time frame is critical. Therefore further clarification as to the effects of this bubble on accuracy is required. The suitability of the transducers in the pumped bore needs to be examined in terms of accommodation downhole. It is recommended that conduit is used to house transducers downhole for a number of reasons. In particular , it is recorml1ended for physical protection and cable control. The minimum internal diameter required is 27mm and options therE!fore include 25mm NB pvc conduit, 32mm galvanised water pipe (or simila.r) or 32mm continuous polybutylene hose. It is expec:ted that in a number of instances, the size of bore and the diameter of pump column installed will limit these options and contingent measures need to be determined.