TCR Arabia offers post weld heat treatment by using electricity as source of heating for stress relieving of weld joints. All TCR Arabia heat treatment services are designed to minimize downtime, improve structural integrity, and enhance effective plant life. Additionally, depending on the mobility of the required equipment many of our heating processes can be applied on-site or at your facility.
TCR Arabia has specialized personnel and equipment to carry out a wide range of heat treatment processes like post weld heat treatment of vessels, piping, spheres and fabricated spools.
TCR Arabia specializes in local Post weld heat treatment of carbon steel piping welds (pipe-work, headers, flange joints, valves and branches) by means of the electrical resistance method, in the form of ceramic heater pads.
Codes and Standards
ASME B31.3 : Process Piping
ASME Sec IX : Welding and Brazing Qualification
AWS D10.10 : Local Heat treatment of Welds in Piping and Tubing.
PWHT Equipment at TCR Arabia
All PWHT equipment in use by TCR Arabia is purpose built and have a valid current calibration certificate. Electric power sources are 380/415/440V 3 phase 50Hz primary supply step down transformer secondary output (heat treatment unit) giving low voltage circuits. Temperature control equipment is either manually operated through energy regulators or automatically operated using modular controls. Recording of temperature, for the electrical resistance method, or the induction heating method is by means of calibrated chart type temperature recorder. Calibration frequency of recorders will be one year.
Strong Commitment to Safety
Reference shall be made to the Safety Plans, Task Risk Assessments and Safety Method Statements pertinent to the work being carried out and to the work location. All heating elements shall be thoroughly examined before use in order to ensure that the element wire is not exposed. Examination to be also made for broken beads in both the heater pad and the element tails. Twist-lock connection shall also be examined to ensure that the insulation is sound and that a good electrical joint is made. All cable connections shall be properly insulated. The component surface shall be free of contaminants.
Before a Heat Treatment is switched on particular attention shall be paid to the work area to ensure that there are no combustible materials present which can be affected by the heated zone, and that fire prevention/protection measures are available.
Documentation And Reporting Of Test Results
Upon completion of each electrical resistance Local PWHT cycle, the Local PWHT Thermocouple Identification form shall be filled in and attached to the recorder chart. The time temperature curves on the recorder chart shall be marked to identify the corresponding thermocouples. The Local PWHT Report Form shall be filled and handed over to client as generic records. PWHT chart shall be signed at the start of PWHT cycle by approved PWHT technician with weld number, date, start time etc. Thermocouple identification form will fixed on the chart after PWHT cycle.