Petrolatum - Tapes & mastics
Durable corrosion protection of pipeline components with complex shapes is most reliably achieved by using supple petrolatum tapes that follow the contours of the components. Combination with a pipe protection fleece guarantees additional, very good mechanical protection. This method of working is expressly approved by the DVGW (Deutscher Verein des Gas-und Wasserfachs e.V. - German Association for the Gas and Water Industries) worksheets G462 and G463.
The irregular geometry of slide valve groups and ball valves in particular places high demands on the adaptability of the wrapping material. The combination of the DENSO® petrolatum products with DENSOLEN® tapes and DENSOLEN® Rockshield DRM-PP fleece provides easy to apply and safe corrosion protection with very good resistance to mechanical stresses. Pipe components such as for example lubrication and ventilation lines can be wrapped using DENSOLEN®-Tape AS40 Plus. Combined with DENSOLEN®-Primer HT, three or four layers will achieve stress class B-50 or C-50 respectively.
Surfaces and parts with complex shapes are protected using petrolatum mastics and tapes. For the combined application of DENSOLEN® petrolatum products, the DENSOLEN® products must be applied first in every case, as otherwise the petrolatum may have an adverse effect on the adhesion of the DENSOLEN® tapes. Recesses, voids and crevices must be filled void-free with DENSO® Mastic PF or DENSOPLAST®-Mastic. In the next stage of work, a total of three layers of DENSOPLAST®-Tape are applied to the part to be protected in a spiral wrap or strip by strip procedure.
The DENSOLEN® Rockshield protection fleeces have proved their usefulness in increasing the mechanical resistance of plastic corrosion protection coatings. DENSOLEN® pipe protection fleeces are laid in strip segments and flamed in the overlap area to fuse them.
Corrosion protection system for flanges
For flange connections, the flange gap and the connecting bolts pose special challenges for corrosion protection coatings.
A proven method of evening out the surface is to fill the flange gap and even out the bolt heads and nuts with DENSO® Mastic PF or DENSOPLAST®-Mastic.
Subsequent wrapping with DENSOPLAST®-Tape ensures reliable corrosion protection. The additional wrapping with DRM-PP 500 Rockshield fleece gives the anti-corrosion system high mechanical stability to resist indentation and impact stress.
