GD Test - ESP

Objectives Of GD - Test - ESP

  • To know the flow pattern within the ESP area.
  • To know the average velocity in the field
  • To know the co efficient of variation
  • To know standard deviation

Objectives Of GD - Test - ESP

Gas Distribution test is conducted inside ESP during plant shutdown. Also, the flow concentration can be adjusted with the help of diverters placed on G. D. screens

  • The Gas Distribution test is conducted after installation of honey comb and diverter plates inside the duct. This test is conducted only after completing overall activities of flow adjustment is carried out in the unit overhaul. Pre test is not required as the flow is changed after conducting overhaul activities in the boiler, duct and ESP.
  • The Gas Distribution test may be conducted as stand alone or in parallel with post CAVT by hot wire anemometer. The test is conducted in each pass of the ESP and the readings are taking between first and second field of ESP to get flow pattern through first field. The reading are taking at pre- decided location from top to bottom and from left to right in each pass.
  • The readings are then tabulated which gives us the readings with all details like average velocities, deviations etc, accordingly graphs are also plotted and the same are analyzed. If any flow concentration is observed in the readings or readings below average are found, then the diverter adjustment is proposed or done to get uniform flow pattern inside the ESP pass. The reports with conclusion etc are submitted to clients.
  • This testing helps to improve the ESP performance by properly utilizing the electrode capacities/area and ash collection.
  • The time required for the testing is about five to six hours for taking reading. For studying the flow pattern and adjustments to be carried out, if any as per study, it may take about 24 hrs to do the adjustment and counter checking the same by another set of readings.
  • The client is required to keep all the parameters and flow constant during testing


  • Improvement in ESP performance.
  • More ash collection.
  • Improvement in SPM provided perfect ash evacuation from the ESP hoppers is done and electrical fields are healthy.