How Pneumatic Slug Testing Works
Field Setup and Slug Test for Groundwater Sampler or Direct Push Monitoring Well
- The Slug Test Manifold is threaded onto the top of the rods or installed with an adapter on well casing. Either an O-ring or Teflon® tape is used to seal the connection.
- The pressure transducer is lowered through the rod bore so it is below the static water level a known distance. The transducer must be placed so that when the water level is depressed with air pressure the transducer is always below the water.
- The airtight fitting on the transducer cable is tightened by hand to seal the connection.
- Transducer cable is attached to the data logger.
- Data logger is attached to 115 volt power supply. Power inverter from vehicle 12V outlet is sufficient.
- Data cable from logger is attached to computer RS232 port for data transmission.
- Computer is powered on and Slug Test Data Acquisition Software is activated.
- Release valve is closed. Inlet valve is opened. Pressure regulator is closed.
- Air supply (pump or compressed air cylinder) is attached to the quick connect at the pressure regulator.
- The pressure regulator is slowly opened to pressurize well head and depress water level the selected distance. Usually less than 2 psi of air pressure is required.
- Close inlet valve and leak check the system.
- Monitor transducer response on computer screen and air pressure on gauge to verify system is stable.
- Quickly open the release valve to initiate the slug test.
- Allow sufficient time for water level to recover to static level. Slug test complete.
What the Data Looks Like...
