The manufacture of ASME pressure vessels, chemical reactors, industrial heat exchangers and pressurized tanks constitutes one of the most demanding areas of metalworking engineering. These equipments often operate under extreme pressures and temperatures, sometimes containing flammable or hazardous fluids, making safety an non-negotiable factor.
The Regulatory Framework: ASME Code vs. European PED Directive
In Europe, any equipment subject to a maximum allowable pressure greater than 0.5 bar must comply with the Pressure Equipment Directive (PED 2014/68/EU). The two most widely implemented normative approaches for dimensioning and manufacturing these components are the North American code ASME Section VIII Div. 1 & 2 and the harmonized European standard EN 13445.
Both specifications prescribe in extreme detail the thickness of plates, the radius of dished ends, the location of nozzles and the methodologies for calculating thermal and mechanical fatigue.
Control and Non-Destructive Testing (NDT) in Manufacturing
During the manufacture of an accumulator or heat exchanger, all longitudinal and circumferential shell welded joints undergo exhaustive inspections. Methods such as industrial radiography (RT), ultrasonic testing (UT), magnetic particle testing (MT) and liquid penetrant testing (PT) ensure that there are no porosities, slag inclusions or lack of fusion in the welds.
In addition to NDTs, the completed equipment passes a hydrostatic test at a pressure typically 1.3 to 1.5 times higher than the design pressure (PS), under the supervision of an independent Notified Body (NoBo).
Conclusion
Working with pressure equipment requires advanced technical know-how and qualified processes. Lopes & Caldas Engineering has the experience, certified welders and validated procedures to respond to any pressure vessel manufacturing need on a European level.