NORRES PUR AS hose family with electrostatic discharge capability... NORRES Schlauchtechnik GmbH
TRBS 2153 (formerly BGR 132), the new technical rule applicable throughout Germany since last year, presents hose manufacturers with several new challenges: the exclusive use of wall materials that are conductive or capable of electrostatic discharge is recommended by TRBS 2153 for transport hoses in hazardous areas. In September 2009, NORRES Schlauchtechnik (Gelsenkirchen, Germany) unveiled its new, permanently antistatic PUR AS hose family with electrostatic discharge capability that meets the requirements of TRBS 2153. The NORRES CONNECT Safety Clamp Systems 230, 231 and 232, which allow polyurethane hoses to be clamped to all standard connection types, are now also available for this family. These innovative techniques for connecting commercially available fittings to polyurethane hoses lead to a clear reduction in maintenance, energy and process costs. NORRES will present its formidable portfolio of PUR AS hoses with compatible CONNECT Safety Clamp Systems at the K 2010 fair in Dusseldorf from October 27 to November 3, 2010.
All products in the innovative NORRES AIRDUC®, PROTAPE® and BARDUC® PUR AS family are made from a special wall material. Hoses manufactured in this way impress with a permanent electrostatic discharge capability < 109 Ω as well as a milky transparent surface through which the delivered material is clearly visible. Conventional, conductive transport hoses or hose types capable of electrostatic discharge often only achieve these specifications with the help of migrating antistatic material and carbon blacks. It is a well-known problem of antistatic material that its effect is exclusively attributable to its migration to the hose surface, leading to an accumulation of moisture from the ambient air. However, when solids are conveyed, the antistatic material that migrates to the inner surface is continuously abraded, with the result that the antistatic is "leached out" and the discharge effect is gradually weakened. Moreover, the antistatic material can also be absorbed by the product being conveyed. The fact that hoses whose conductivity is achieved by adding carbon blacks are – not surprisingly – also coloured black is a further drawback. On the one hand, this obscures the user's view of the product being pumped while on the other, the conveyed material may be contaminated due to wear. Since the mechanism of action that is responsible for the electrostatic discharge capability is not linked to migration, there is no contamination of the conveyed material and no deterioration in the electrostatic discharge effect.
04 November 2010
