The Damstahl SUPER DAIRY Tubes are the ideal solution for critical applications. By using a specific welding method followed by a chemical posttreatment, the risk of subsequent corrosion and bacterial growth has been minimized.
Compared to common tubes, the heat tinting and discoloration have been reduced markedly. In addition, the reduced surface roughness of the main surface and the welds alike minimizes the risk of impurities sticking to the surface.
Traditionally, dairy tubes are made by laser welding, an excellent process which, in most cases, produces a fine result. However, laser welding requires an extremely fine cutting and subsequent correction of the coil. Otherwise, any lack of binding in between the weld and the base metal may cause the formation of crevices and, apart from inducing a greater risk of crevice corrosion, such defects may act as growth sites for bacteria.
When manufacturing the Damstahl SUPER DAIRY Tubes, only TIG welding is used. TIG is a slower process than laser. However, it is better for “absorbing” the defects from the possible non-ideal cutting and correction of the coil. Thereby, the risk of critical crevices is significantly reduced.
Heat tinting and impurities are both known to reduce the corrosion resistance and increase the risk of bacterial growth, and, ideally, the mechanical manufacturing should be followed by an appropriate chemical post-treatment. To cope with that, all Damstahl SUPER DAIRY Tubes have been subject to a final pickling. This pickle is carried out in a nitric acid / hydrofluoric acid solution capable of removing all heat tinting and impurities.
Along with the welding process, this ensures a maximum corrosion resistance and a minimum risk of bacterial growth. To maintain this and to avoid pollution by impurities during transportation or handling, all Damstahl SUPER DAIRY Tubes have been sealed off in both ends immediately after the final drying process.
When dealing with food and pharmaceutical products, the surface roughness is of utmost importance. Therefore, the surface roughness of the Damstahl SUPER DAIRY Tubes is guaranteed not to exceed Ra 0.4 μm, measured on the “free surface” and 0.8 μm on the welds.
The quality of the steel, along with the manufacturing, ensures the Damstahl SUPER DAIRY Tubes the optimal corrosion resistance. You get the right solution at the first attempt and the equipment benefits from visually attractive tubes with the optimal corrosion resistance and the optimal life-span. The risk of break-downs and expensive repairs is reduced, and in the end your bottom line result is improved.
Not polished or polished grit 220
Ra max 0,4 my on tube surface
Ra max 0,8 my on the welding seam
Tolerances according to EN/ISO 1127
Production norm EN 10217-7
Certificate according to EN 10204/3.1
1.4404
Outside dimensions from 25 to 101,6 mm
