- #Drawdown test procedure pdf
- #Drawdown test procedure full
All groundwater abstraction eventually has an impact it is only a matter of where, when and whether or not the impact is acceptable.
To determine the environmental impact of the abstraction. To determine the effects of water abstraction on neighboring abstractions. To test the operation of the pumping and monitoring equipment, to make sure that everything is working safely and efficiently, and if applicable, to confirm that the contractors have done their job properly. To derive the hydraulic properties of the aquifer, such as transmissivity and the storage coefficient, or to reveal the presence of any hydraulic boundaries. How much drawdown does it take to yield a certain amount of water? To assess the hydraulic performance of a borehole, usually in terms of its yield-drawdown characteristics. To determine the reliable long-term yield (or ‘safe’ yield) of a borehole, and therefore whether or not the borehole can be regarded as a ‘success,’ and how many people it will be able to supply. Pumping tests can be undertaken for a wide variety of reasons, including the following: The way in which the water levels respond to the pumping is then analyzed to derive information about the performance characteristics of the borehole and the hydraulic properties of the aquifer. Determination of Dyne level by wetting is then performed to a standardised test procedure.Pumping tests or aquifer performance tests is a field experiment in which a well is pumped at a controlled rate and water-level response (drawdown) is measured in one or more surrounding observation wells and optionally in the pumped well (control well) itself. As soon as possible, the applicator is then drawn down over this bead, spreading it over the surface. To perform the Dyne test with a “DyneX” applicator, first apply a short bead of surface tension test fluid from a dropper bottle directly to the sample surface. Packed in a cushioned protective container. All four gates are precision ground to the same clearance to facilitate quicker test-to-test turnaround, and to provide the longest service life. For best results, we strongly suggest use on a “DyneX” drawdown platform. This restricted passage channels the flow of the Dyne fluid through the gate whilst limiting the wet film thickness applied to a maximum of only 12.5 microns. This tool can produce high quality drawdowns in a confined area, making direct benchtop testing a reality. A precision ground gate, 38mm wide, is centered on each of the four edges. The “DyneX” applicator measures only 13 x 13 x 64mm. Remarkably fast and easy clean-up saves time and cleaning supplies. With a Teflon® coated surface it is ideal for Dyne testing – no attraction to, or contamination from the applicator affects test results. #Drawdown test procedure pdf
See the Metering Rod Selection Chart PDF below for further information. With the use of such non-abrasive cleaners, metering rods can be reused repeatedly. Economical and easy to use simple clean-up with water, alcohol, appropriate solvent and low lint cloths.
#Drawdown test procedure full
These lab rods or drawdown bars can be used either to test two coatings simultaneously, or for full width substrate evaluations using one test liquid. Rods are available in 6.3mm and 12.7mm diameters. The 400mm long “Mayer” rod has 305mm of wire wound on centre. The rods, widely known as Metering Rods, Mayer Rods or drawdown bars are fabricated from 303 stainless steel the wire winding is 304 stainless steel. Liquid crystal thermometer is accurate to better than 1☌.Īpplies a highly uniform wet film coating.These wire-wound metering rods, when used on a precision surface such as the “DyneX” Drawdown Platform, will apply a highly uniform wet film thickness, which is ideal for Dyne testing. Five pre-adjusted shock absorbing levelling feet and surface mounted spirit level ensure precise levelling and firm footing. Each unit is meticulously inspected to assure flatness. The 305mm x 305mm smoothing pad with closely controlled compressibility is engineered to promote uniform fluid distribution with minimal squirm. 12.7mm thick float glass platform large enough for direct A to B comparisons or evaluation of machine caused treatment variations. Full width magnetic clamp allows precise sample positioning with secure grip.
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