- Field assembled insulating flange shall be tested with 1500VDC applied across the flange for 1 minute without causing break down or flash over.
- Electrical test to verify the insulating of the joint/ flange assembly for minimum of 1 MΩ for new flange.
- Electrical insulation of in service insulating joints can be measured by Swain Clamp On Ammeter.
Swain meter to measure pipe current (photo from William H Swain company website)
- Electrical insulation of in service insulating joints can be tested by remote reference potential methods, if the potential difference is greater than 10 mV, then the insulation is sound.
- Point to point voltage measurement: if the potential difference is greater than 10 mV, then the insulation is sound.
- Magnetic compass method may be utilised for shorting of the insulating joints.
- Radio Frequency (RF) tester shall give reliable dielectric testing results, e.g. Tinker & Rasor RF-IT Note: proper types to be used.
- No Ohm meter method should be accepted as dielectric testing for insulating flange joint in service.
- High voltage insulation tester such as Megger tester shall NOT be used for in service environment.
- Welding should be carried out with the short connection of insulating joints, the jumper cable should be removed as long as welding is completed.
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