scope:

This standard describes the materials and application of fused polyolefin coating systems for buried service. This system is applied in pipe coating plants, both portable and fixed, using coating techniques and equipment as recommended by the manufacturer. Normally, these prefabricated, polyolefin coatings are applied as a three-layer system consisting of (1) a liquid adhesive or 100 percent solids adhesive layer, (2) a corrosion-protection inner layer, and (3) a mechanical-protection outer layer. 

Maximum temperatures. This standard is intended for pipe in potable- water service. Therefore, the maximum service temperature of this coating considered in this standard is based on the maximum service temperature of potable water. These coating systems will perform at higher temperatures. Consult the coating manufacturer for conditions and limitations. 

Conditions not described in this standard. This standard does not describe the additional materials and procedures that may be required for difficult conditions, such as those encountered in rocky areas or where soil conditions are known to be severe and in construction of underwater lines, casing pipe, and river crossings. The manufacturer should be consulted for specific recommendations when these conditions exist.

Purpose

The purpose of this standard is to provide minimum performance requirements for fused polyolefin coating systems for the exterior of steel water pipelines, including system components, application, inspection, testing, marking, and packaging requirements.