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Inspecting Pumps, Siphons and Controls

Inspecting Pumps, Siphons and Controls. NC Certified Subsurface Systems Inspector Training School 2012. CIDWT Disclaimer.

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Inspecting Pumps, Siphons and Controls

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  1. Inspecting Pumps, Siphons and Controls NC Certified Subsurface Systems Inspector Training School 2012

  2. CIDWT Disclaimer These materials are the collective effort of individuals from academic, regulatory, and private sectors of the onsite/decentralized wastewater industry. These materials have been peer-reviewed and represent the current state of knowledge/science in this field. They were developed through a series of writing and review meetings with the goal of formulating a consensus on the materials presented. These materials do not necessarily reflect the views and policies of the Consortium of Institutes for Decentralized Wastewater Treatment (CIDWT). The mention of trade names or commercial products does not constitute an endorsement or recommendation for use from these individuals or entities, nor does it constitute criticism for similar ones not mentioned.

  3. NDWRCDP DisclaimerThis work was supported by the National Decentralized Water Resources Capacity Development Project (NDWRCDP) with funding provided by the U.S. Environmental Protection Agency through a Cooperative Agreement (WPA No. X-830851-01-0) with Water Environment Research Foundation (WERF) in Alexandria, Virginia. These materials have not been reviewed by the U.S. Environmental Protection Agency, NDWRCDP, or WERF. The contents of these materials do not necessarily reflect the views and policies of the NDWRCDP, WERF, or the U.S. Environmental Protection Agency, nor does the mention of trade names or commercial products constitute their endorsement or recommendation for use.

  4. Dosing Systems Form 6.2 Dosing Systems (DS)

  5. 1. Indicate type of dosing device Pump Siphon

  6. Indicate Dosing regime • Demand • Timer

  7. Alarm Pump On PumpOff What is a Demand-dosed System? • “Socially-controlled” • Controlled by flow into the tank

  8. What is a Timer-dosed system? • Flow controlled by time • Timers • ON: OFF • Programmable Logic Controller • PLC • Computer

  9. 2. Controls

  10. Piggy back switch 2. a. Type of controls Control panel Plugger panel

  11. 2. b. Is enclosure watertight?

  12. 2 c. Electrical components sound • Exposed wiring • Corrosion

  13. 2. d. Alarm test switch working properly? Need Pic of test switch

  14. 2. e. DEMAND AND TIMER: At time of inspection, control switch (HOA) was set at: • “Hand” • “Auto” • “Off” Make sure it is set Auto when finished

  15. 2. e. TIMER SYSTEM: At time of inspection, timer was set at: • “On” Mode Setting • Seconds • Minutes • “Off” Mode Setting • Hours • Minutes

  16. Older Style Analog Timer 24-Hour Cycle Controller OMRON Analog Timer

  17. 2. f. Timers, meters and counters operable • Verify performance by lifting floats and observing operation • Event / Cycle counter • Elapsed time meter

  18. 2. g. Telemetry operable • Land line in place • Dialer reaches someone

  19. Status • Acceptable • Panel on AUTO • Electrical components in good condition • Alarm test switch operates both audible and visible alert • Meters and counters operational • Timer settings correct • Telemetry operable

  20. Status • Unacceptable • Alarm not audible or visible • Electrical components damaged • Meters or counters not logging actual operation • Wrong timer settings • Telemetry not operable • Red flags • Panel on OFF - If operates properly in ON then it is acceptable, but make a note

  21. Unacceptable

  22. 3. Water level sensors a. Type of sensor • Floats • Pressure Transducers • Ultrasonic • Other:

  23. Float switches Mercury Float Switch Mechanical Float Switch

  24. Other sensors • Pressure Bell • Pressure transducer • Ultrasonic • All are single devices with multiple functions • Mostly proprietary

  25. 3. b. Pump floats/sensors securely fastened • Float tree • Bracket

  26. 3. c. Pump floats/sensors functioning properly • Float switch • Operate by hand • Other proprietary controls • Contact manufacturer

  27. Alarm Single Differential Float PumpOn PumpOff Float Control Installation • Configuration • What are the floats supposed to do? Check the plans! • Are they properly configured?

  28. Timed-dosing configurations • When switch comes up, timer determines when pump operates Alarm Single Differential Float Timer enable Off Courtesy of American Mfg. Inc

  29. Timed dose: equalization with override Should only provide one timed dose Override Alarm Enable Redundant Off Courtesy of American Mfg. Inc

  30. Peak Enable Alarm Enable Off Timed dose: peak enable Increases the rate of dosing up to design or “peak” flow Courtesy of American Mfg. Inc

  31. 3. d. Alarm float/sensor operating both audible and visible • Trip float by hand • Lights • Buzzers

  32. Status • Acceptable • Sensors present, tethered and properly functioning • Unacceptable • Sensors missing, not tethered or not operating • Red flags • Grease on floats

  33. 4. Discharge assembly Discharge assembly: N.A.____________ a. Anti siphon/air release device N.A._____ YesNo b. Backflow prevention (check valve) present N.A.___ Yes__No ___ c. Air release located below check valve N.A.___Yes__No____ d. Quick disconnect present N.A.___Yes__No____ e. Isolation valve present N.A.___Yes__No____ f. Air release valve present N.A.___Yes__No____ g. Inline filter present N.A.___ YesNo____

  34. Pump Discharge Assembly • Anti-siphon hole? Prevents siphoning if the check valve gets stuck open. Prevents air lock of pump Check valve? Prevents drainback into the tank from the field. NOT USED IN COLD CLIMATES. Air release below valve

  35. Pump Discharge Assembly • Quick disconnect Allows removal of pump without cutting pipe Isolation valve present Prevents backflow from field during inspection and O&M

  36. Discharge assembly devices • Quick disconnect may be a threaded union or a cam lock fitting • Isolation valve may be brass or PCV

  37. 4. f. Air release valve on supply line? • Air release valve may be required if supply line is long and changes elevation over it’s run. • Proper function • Listen for air • No leaks • Bubbles are leaks • Green area around box • May not be closing properly

  38. 4 g. Inline filter present • Required?

  39. Status • Acceptable • Discharge assembly in good working order • Parts comply with permit • Unacceptable • Discharge assembly not working • Parts are missing or inappropriate

  40. 5. Pump/Siphon

  41. 5. a. Siphon operating properly • Activates and doses to component • Confirm delivery • Pressure manifold • D-box

  42. 5. b. Type of pump: • Multi-stage • Single-stage No Sump Pumps

  43. 5. c. Pump operating properly? • Turns On/Off • Effluent delivery to correct component is confirmed

  44. Confirming delivery: pressure-dosed gravity system • Pressure manifold cleanout

  45. Confirming delivery: Low-pressure pipe system • Lateral turnup • Note nature of effluent

  46. Confirming delivery: Drip dispersal At Schrader valve on air Release/vacuum breaker

  47. Confirm delivery via flow meter • Flow meter

  48. Confirm delivery via flow meter • Flow meter

  49. Confirming delivery: Advanced treatment components • Media filter or ATU • At distribution system of unit

  50. Status • Acceptable • Pump or siphon operates • Delivers dose to proper component

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