30 JULY 2024 WorldWide Drilling Resource® 2024 Booth 1006 Groundwater Sampling with an Isomega® Bladder Pump Adapted from Information by Baker Water Systems Since groundwater generally has different conditions such as temperature, pressure, gas content, and oxidation-reduction than surface water, it is important sampling devices transport representative samples for evaluation. Devices that introduce air, gas, or significant pressure change into a sample are less desirable for preserving the chemical integrity of the sample. The chemical properties of the liquid in a well may determine which pump is best suited for each particular application. Monoflex Isomega® Bladder Pumps represent recovering groundwater samples to depths of 250 feet without compromising the chemical integrity of the sample. They are available in stainless steel, PVC, and PTFE (polytetrafluoroethylene). These pumps employ a closed collection system eliminating agitation or air contact with the sample and uses an inert PTFE bladder to ensure water sample integrity. Bladder Pumps can operate with minimal head, and a vacuum increases the pumping rate making pump operation less dependent upon head with the Monoflex Integrated Vacuum/Pressure pump controller. During operation, the chamber fills with liquid through the bottom screen inlet, past the lower ball valve, and into the pump chamber collapsing the bladder. A pressure of .45 psi per foot of depth is required to lift a sample to the surface; the pumping rate will be dependent upon each of the following: j Controller type j Pump submergence j Adjustment of the cycle time j Inside diameter of tubing lines j Depth to the water surface j Capacity of the pump body j Viscosity of the pumped liquid j Flow rate of the compressed air or gas Monoflex Isomega Bladder Pumps can be converted to air/gas displacement pumps with minor modifications. Air/gas displacement pumps are designed for initial well pumping, well purging to sampling, or to pump contaminants from recovery wells. They have a larger pump chamber, which makes them ideal for pumping large volumes of water or contaminants, but due to pump chamber requirements, they cannot be converted to bladder pumps. WTR
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