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, (2) a corrosion-protection
inner layer, and (3) a mechanical-protection outer layer.
1.1.1 Maximum temperatures. This standard is intended for pipe in
potable-water service. Therefore, the maximum service temperature of this
coating 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.
1.1.2 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 and in construction of underwater
lines, casing pipe, and river crossings.