2-J.3.3 DESIGNERSa) A Designer engaged in and/or having responsible oversight for pressure vessel design shall as a minimum hold the qualification described in (1). Optionally, the Designer may also hold any of the additional qualifications described in (2) through (4).(1) General Pressure Vessel Design. The ability to demonstrate through documentation that they have a minimum of 4 yr of experience in pressure vessel design. This qualification includes all design activity required for this Division that they engage in, or as listed in the Manufacturer’s Quality Control System, except as provided for in (2), (3), and (4).(2) Heat Exchanger Design. The ability to demonstrate through documentation that they have a minimum of 2 yr of experience in each design Code activity for heat exchanger tubesheets (4.18), bellows expansion joints (4.19), and flexible shell element expansion joints (4.20).(3) Numerical Analysis. The ability to demonstrate through documentation that they have a minimum of 2 yr of experience performing design calculations not specifically addressed in this Division, including numerical analysis. A Designer engaged in the performance of numerical analysis shall be able to demonstrate through documentation that they have received instruction in the use and understanding of any numerical analysis computer program(s). This documentation shall be provided to the Designer by one of the following-a) the developer of the computer program (e.g., the software vendor)(-b) a training course acceptable to or licensed by the developer(-c) a Certifying Engineer with requisite knowledge of the computer program and qualifications to train others on its use(4) Quick-Actuating Closures. The ability to demonstrate through documentation that they have a minimum of 2 yr of experience in design activity for quick-actuating closures (4.8).(b) The experience requirements of (2), (3), and (4) may be acquired concurrently.(c) The Designer’s qualification(s) remain valid if they can demonstrate through documentation design activity completed within a continuous period of 36 months for each of their qualification(s) in (1), (2), (3), or (4).