Dairyland Polarization Devices

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Dairyland Isolation Switches

Introduction
When decouplers are installed on a pipeline for AC voltage mitigation and over-voltage protection, there may be occasions where disconnection of the decoupler is required. Reasons for disconnection of the decoupler include:
• Isolation of high frequency signals from locators and coating defect instrumentation
• Decoupler isolation from close interval survey (CIS) operations
• Decoupler testing
• Certain pipeline test procedures would otherwise be affected if the decoupler remained in the circuit

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