Welding For High Pressure Pipes. AWS D143 is often used for heavy equipment but welding codes like this can reference other welding codes like ASME section IX for specific needs like hydraulic pressure lines. 3 No welding shall be done upon any boiler pressure vessel or pressure piping unless the above requirements respecting procedure tests and pressure welder qualification tests including tests of welding machine procedures and welding.
Procedure Specifications that have been qualified by a technically competent group or agency such as the NCPWB may be used by other member companies of that group or agency providing that each user of the procedure qualifies at least one welder using the Welding. It may vary from 2 to 10. There are codes for welding earthmoving equipment and we know heavy equipment has high pressure hydraulic lines.
3 No welding shall be done upon any boiler pressure vessel or pressure piping unless the above requirements respecting procedure tests and pressure welder qualification tests including tests of welding machine procedures and welding.
Classification I piping is defined as piping where the process fluid in combinationwith operating temperatures pressures and such other conditions which in thejudgments of City University London make weld failure especially hazardous hazards shall include flammability toxicity explosion etc. A welded pipe can be manufactured in large sizes without any upper restriction. 1 weld opposite one another or 2 evenly spaced around the pipe. ASME B311-2012 for high pressure steam and other heaing mediums.