Application of Asphalt Coatings to Corrugated Steel Sewer and Drainage Pipe

A862/A862M: Standard Practice for Application of Asphalt Coatings to Corrugated Steel Sewer and Drainage Pipe

For engineers and infrastructure professionals tasked with ensuring the longevity and performance of critical underground systems, understanding material protection is paramount. ASTM A862/A862M, the "Standard Practice for Application of Asphalt Coatings to Corrugated Steel Sewer and Drainage Pipe," provides an essential framework for achieving robust corrosion resistance in these vital conduits. This authoritative standard offers proven methodologies for applying protective asphaltic layers, safeguarding investments in public works and private developments against aggressive environmental factors.

What is A862/A862M?

ASTM A862/A862M is a comprehensive standard practice developed by ASTM International that details the procedures for applying shop-applied asphaltic coatings to corrugated steel sewer and drainage pipe. Its primary purpose is to ensure that these coatings provide effective, long-term protection against corrosion and abrasion, thereby extending the service life of the pipe systems. This standard is a cornerstone for manufacturers and specifiers aiming for consistent, high-quality protective finishes.

Scope & Purpose

This practice governs the post-application of asphaltic materials to corrugated steel pipe and corrugated structural steel plate, specifically for shop-applied coating operations. It defines various classifications of asphaltic coatings, including standard full coatings, paved inverts, and smooth linings, catering to different service conditions. While it focuses on the application process, it does not cover the performance requirements or testing of the coatings themselves, which are addressed by complementary standards. The standard is intended for use during the manufacturing process to establish a baseline for durable pipe protection.

Who Must Comply?

• • Primary audience: Materials Engineers, Production Engineers, Quality Control Inspectors, Civil Engineers, and Highway Engineers involved in the design, manufacturing, and specification of corrugated steel pipe for infrastructure projects.
• • Industries affected: Construction, Infrastructure Development, Water and Wastewater Management, and Pipe Manufacturing.
• • Compliance nature: While often specified by contract and project requirements, compliance is generally voluntary unless mandated by specific project specifications or regulatory bodies.
• • Enforcement: Compliance is typically verified through project inspections, quality control audits by manufacturers, and third-party verification during construction or fabrication.

Key Requirements Overview

The standard requires that steel surfaces be thoroughly cleaned of all contaminants, including dirt, grease, dust, and moisture, immediately prior to the coating operation. Professionals must ensure that asphaltic materials are applied at specified temperatures, typically between 392°F and 410°F (200°C to 210°C) for the main tank, to achieve optimal adhesion and flow. Key provisions include a two-stage dipping process for the initial coating application to ensure uniform thickness and adherence, with a cooling period between stages. Furthermore, the standard mandates proper handling and storage of coated pipe to prevent damage to the asphaltic layer, including the optional use of inorganic dusts to prevent sticking.

Related Standards & References

ASTM A862/A862M is intrinsically linked to ASTM A849, "Specification for Post-Applied Coatings, Pavings, and Linings for Corrugated Steel Sewer and Drainage Pipe." While A862/A862M details the "how-to" of application, A849 defines the