Some control panels can measure the pumping rate, and the start-up technician will verify those readings with the physical measurement. This provides a measurement of the pumping rate. The technician then makes a simple calculation to determine the volume that was pumped over the time interval. The pumps run for a specific amount of time and then a measurement is taken for how far down the water was lowered in the well. The Romtec Utilities start-up technician runs the pumps and measures how much water is pumped over a given time interval. When everything is set up correctly, the draw down test is straightforward. With a filled force main, the head pressure will be consistent for the test. This will lead to an unreliable reading from the draw down test, and it will be difficult to measure if the desired pumping rate for the pump station is reached. With an empty force main, the head conditions will be very unpredictable when the pumps operate. The draw down test is used to measure the pumping rate, and in order for this measurement to be accurate, the force main must be filled. One criterion of design is the desired pumping rate and another is the TDH or Total Dynamic Head conditions. Romtec designs pump stations based on a project specific set of design criteria. In order to complete a draw down test, the force main must be filled with water. The most obvious process is to test the pumps, but the water is also required to fill the force main if it is newly installed. The first requirement for the draw down test is having water available onsite. This test is an important part of commissioning new lift stations and there are things to consider onsite to complete this test. Having the water available onsite is needed for two processes. The draw down test is conducted to measure the pumping rate in order to verify that the pumps will operate at the specified flow requirements. This step can be as easy as tapping into a nearby fire hydrant, but in most scenarios, water is scheduled to be delivered by truck for the start-up. This is done by inserting compressed air (around 100 psi) into the cylinder at TDC and then measuring how much is lost from the seals. 1.1.1 Drawdown Testing Drawdown, the well produced on a fixed choke setting, until the test objective has been reach. The first requirement for the draw down test is having water available onsite. The leakdown test measures how well the cylinder is sealing. The draw down test is conducted to measure the pumping rate in order to verify that the pumps will operate at the specified flow requirements. The Hydrogelogists best guess, even after a Step Drawdown test, often results in a pumping rate which is either too high or too low. One of these tests is called the draw down test. The role of this technician is to start the pump station for the first time and to test the functionality of the system to make sure it functions per the system design criteria. The effect upon adjacent water wells can be accurately assessed and monitored during all mining or construction activities.Romtec Utilities commissions each of its pump stations with a start-up technician. GeoSonics/Vibra-Tech’s Re:mote Monitoring instruments provide the levels of adjacent wells during testing and for pre- and post-testing. When plotted, well levels can be reviewed by mine personnel or hydrologists as part of future planning.ĭrawdown testing also relies upon the measurement of static water levels in adjacent wells. Bureau of Mines research studies (Minerals Research Contract Report, Survey of Blasting Effects on Ground Water Supplies in Appalachia, Parts I and II) which have demonstrated the value of water well drawdown testing. GeoSonics/Vibra-Tech’s experience in testing includes U.S. Long-term evaluation of wells and their ability to recover following pumping is a strong indicator of well condition. Pre-project inspection of well systems provides a reference point prior to the start of excavation or blasting and can eliminate issues at future dates.ĭrawdown testing is recommended as part of inspections for wells. Whether on-site or neighboring wells, the level of water change associated with dewatering for site development or standard quarry operations requires evaluation. A true well flow test, well recovery test, or well draw-down test requires special equipment and locating, opening, and pumping right at the well. Water quality and quantity within well systems are part of any water management program for mining and quarrying operations. (MASW) Multi-Channel Analysis of Surface WavesĬount on GeoSonics/Vibra-Tech’s reliable water table drawdown testing to keep your dig site plans from going under.Post-Blast/Post-Construction Inspections.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |