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P844.4 - Standard for Impedance Heating of Pipelines, Vessels, Equipment, and Structures - Application Guide for Design, Installation, Testing, Commissioning and Maintenance

This document aids the user in specifying, installing, operating, testing, and maintaining impedance heating systems that will: A) Maintain design temperature of contained material or heated surfaces B) Provide electrical, thermal, and mechanical durability and reliability C) Minimize hazards to the user and/or the surroundings Design information, selection parameters, and data in this document are not intended to provide a complete design of impedance heating systems. The information will provide guidelines for: A) Selecting the optimum impedance heating system design B) Establishing design criteria and constraints for the heated pipeline or vessel to assure system compatibility C) Preparing specifications to obtain quotations on impedance heating systems D) Developing information on installation, operation, testing, commissioning and maintenance of the impedance heating systemThis standard provides for the design, installation, testing, operation, and maintenance of impedance heating systems for pipes, vessels, and structures. This standard applies to general industry impedance heating applications in ordinary locations as well as in hazardous areas having explosive atmospheres. This standard, when used with other recognized codes and standards, is intended to cover impedance heating systems including, system design, specification, installation, operation, testing, commissioning and maintenance. This standard also addresses the following associated systems which are important to the performance of impedance heating systems: A) Heating system B) Piping system C) Thermal insulation system D) Electric power supply system E) Electric grounding system F) Control and monitoring system
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