AWWA C217-16 pdf download.Microcrystalline Wax and Petrolatum Tape Coating Systems for Steel Water Pipe and Fittings
This standard describes exterior coatings that consist of cold-applied micro- crystalline wax or petrolatum primers and tapes and their applications to special sections, connections, and fttings to be used with buried, submerged, and above- ground steel water pipelines. The primers and tapes are not intended for use with steel joints or sections of steel pipe where coatings of cement mortar or concrete are applied directly onto the bare steel pipe. These coatings may be field- or shop- applied according to the provisions of this standard.
1.1.1 Conditions not described in this standard. This standard does not describe the additional materials and procedures that may be required for dificult conditions, such as those encountered in building some submarine lines, casing pipe, river crossings, and lines that are in rocky areas or in severe soil stress. Consult the manufacturer for the additional materials and procedures that may be required for these conditions. These materials may not be described in this standard.
Sec. 1.2 Purpose
The purpose of this standard is to provide the minimum performance require- ments for cold-applied tape coatings made with microcrystalline wax and petrola- tum, including material, application, inspection, testing, marking, and packaging requirements.
Sec.1.3 Application
This standard can be used as a guide for specifying, applying, inspecting, and testing cold. applied microcrystalline wax and petrolatum conforming to ANSI/ AWWA C217 for the exterior of special sections, connections, and fttings for steel water pipelines. The stipulations of this standard apply when this document has been referenced and then only to cold applied tape coatings made with microcrystalline wax and petrolatum.
4.3.1 General. The tape coating system consists of a cold-applied micro- crystalline wax or petrolatum primer and tape applied to the exterior surface of buried or submerged steel water pipe. When construction or soil conditions exist where mechanical damage may occur, the use of an overwrap of an extra thick- ness of tape, a suitable outerwrap, reinforcements, or special backfill provisions may be required (Sec. 4.5). If these conditions exist, consult the manufacturer. Where voids or other surface irregularities are encountered, a microcrystalline wax or petrolatum-based fller material may be required where the tape will not be in full contact with the steel surface.
4.3.2 Primer. The primer shall be a compound of micocrystalline wax or petrolatum and may contain suiable inhibitors. The primer used shall be supplied by the tape manufacturer and shall conform to the requirements given in Tables 1 and 2. The primer shall protect the metal surface before application of the tape and promote adhesion of the tape to the surface.AWWA C217-16 pdf download.