source url Process equipment is subject to high temperature and pressure as well as heavy external loading and static fatigue. Component failure means costly repairs and down time.
Artisan has the tools and the engineering expertise to help prevent these problems.
http://alpineguide.cz/cs--kontaktOranÃƒâ€žÃ‚Â¹Ãƒâ€¦Ã‚Â¾ovÃƒâ€žÃ¢â‚¬Å¡Ãƒâ€¹Ã‚Â This customer wanted to use a standard steam jet for a non-standard application. The standard design shown in the photo made a sharp transition between the nozzle and a thin conical shell. The fillet weld added a reasonable transition for routine applications, but was unsuitable for rapid increases in temperature. Start-up and operation parameters were severe because steam jet components were being heated at a rapid rate. Our engineers used Transient Finite element heat transfer analysis to learn that standard stainless steel parts would not uniformly heat, causing severe thermal discontinuity stress leading to part failure. The analysis was then used as a redesign tool for optimizing the part for the lowest thermal discontinuity stress.
The improved design for high temperature cyclic operation smoothly blended the cone to the steam nozzle, limiting the transient differential thermal strain. The picture of the 125 lb nozzle insert assembly shows the smooth transition at the 100% radio-graphed circumferential weld seam. The surfaces were also polished to reduce surface imperfection; thus increasing the fatigue limit of the material.