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Dielectric Testing

Dielectric Testing Ensures Aerial Devices Are Safe to Use

Joseph Coupal - Thursday, June 27, 2019
ETS Inspection and Services, Boston, MA

Aerial lifts must undergo recurring safety evaluations to protect both human and mechanical resources. These safety testing measures are potentially dangerous acts in their own right as it puts operators and those working near the equipment in close proximity to extremely high voltage. Dielectric testing is accomplished by supplying precise measurable voltage to the aerial devices.

Electrical current leakages is a common occurrence within all aerial devices. This can be attributed to several factors. While small quantities of electric leakages is considered safe and tolerable, certain conditions hasten the degradation of the insulating material and transcend the device into a dangerous condition. The act of degrading insulation introduces the risk of operators being subject to direct contact with high voltage current. Faulty insulation obviously can lead to serious personal injury and death. Dielectric testing and inspection validates the insulation mechanism of an aerial device whether it can handle voltage variations under normal operating conditions or not.

It is recommend that at least once year, dielectric testing must be performed. Overtime, aerial devices may receive repairs or component replacement. So frequent testing might be necessary to meet safety standards. Contact ETS Inspection and Services to check if your aerial devices are due for dielectric testing.

Crane Inspection and Testing Checklist

Joseph Coupal - Thursday, June 13, 2019
ETS - Crane Inspection - Boston, MA

Crane Inspections come in two forms -- frequent and periodic. Prior to conducting crane inspections, it is important to have a background on what type of inspection is about to be performed and what specific items are going to be checked. Both have different objectives:

Frequent Inspection Checklist

  1. Cranes are checked for any maladjustments which may hamper its optimal performance.
  2. Check for any impairment or leakage in lines, tanks, valves, drain pumps, and other air or hydraulic systems.
  3. Inspect for any deformation or cracks in the hook. Also, note for any unusual sound. These are included in both daily and monthly inspection. A certification record must be maintained with the inspector's signature and date during monthly inspection.
  4. Check the hoist chains along with its end connections for any distortion.
  5. Thoroughly check for any excessive wear of components.
  6. Check whether the wire rope reeving system is working in accordance to manufacturer’s recommendations.
  7. Check brakes and emergency switches whether they are operational.

Periodic Inspection Checklist

Additional inspection steps that are typically performed on an annual basis:

  1. Check for any deformation, cracks or corrosion of components.
  2. Search for loose bolts or rivets; cracked or worn sheaves and drums; worn, cracked or distorted pins, shafts, gears, bearings, rollers, locking and clamping devices.
  3. Look if there is an excessive wear on brake and clutch system parts, linings, pawls, and ratchets.
  4. Check load, wind, and other indicator inaccuracy.
  5. Check for any fault or unsafe power plants including exhaust leakages and emergency shutdown feature.
  6. Inspect for worn out chain drive sprockets and excessive chain stretch.
  7. Inspect electrical apparatus for any pitting or any other impairment of controller contactors, limit switches and push-button stations.
  8. Check worn-out tires.

For more information about crane inspection and testing services in Boston, MA, contact ETS Inc..


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