Features & Benefits
- Improved ability to simulate coating holidays due to the customizable coating thickness 20 mils, 40 mils, 80 mils or custom to meet customer's project demands.
- Coating holiday size 1 cm2 or 1 in2.
- Non-conductive surface surrounding the bare area optimized to limit electrical field distortion while maintaining a compact installation size.
- Designed to allow for coupon pointing up placement to match the orientation of coating holidays with the highest AC current densities.
- Weighted steel core with removable coating for corrosion rate measurements as per ASTM G1-03.
- Stamped with a serial number protected from corrosion for improved traceability.
- Accurate AC corrosion risk assessment to avoid unnecessary mitigation costs.
- Regular monitoring provides the pipeline operator with historical and current operating conditions, identifies areas requiring AC mitigation, and validates the effectiveness of AC mitigation systems.
- Improved ability to simulate corrosion rates by allowing for the lateral extension of the corrosion pit under the coating.
- Compatible with remote monitoring and conventional survey equipment.
- Compatible with new and existing test stations.
T: Coating Thickness - 20 mils, 40 mils or 80 mils
H: Holiday Size - 1C (1 cm2) or 1N (1 in2)
L: Cable length - Indicate the desired length in metres
S: Cable size - 10 (#10 AWG)
C: Cable Colour - G - Green, B - Black (Slug Coupon Use)
20 mils thick simulated pipeline coating, 1 cm2 holiday size, 15 meters of #10 AWG green cable
Example of AC Coupon Measurements with an ACC3
The 24-hour average AC voltage recorded across a 10 Ω shunt connected to a 1 cm2 ACC3 was 50.0 mV and the DC voltage was 1.5 mV. The maximum AC pipe-to-soil voltage was 5.0 V.
The average DC current density of 1.5 A/m2 exceeds the 1 A/m2 limit and the AC current density of 50.0 A/m2 exceeds the 30 A/m2 limit. Therefore, there is a risk of AC corrosion at this location based on NACE SP21424-2018 and mitigation will be required.
The maximum AC pipe-to-soil voltage is below the 15 V steady-state touch voltage limit, indicating no shock hazard under normal operating conditions.