ASTM C662-16(2021)

Overview

ASTM C662-16(2021): Standard Specification for Impervious Graphite Pipe and Threading provides standardized requirements for the sizes and types of threads used to join impervious graphite pipe and fittings. This specification also applies to impervious carbon pipe and fittings, focusing exclusively on the physical dimensions critical for performance and interoperability. Developed under the guidance of ASTM International and aligned with World Trade Organization (WTO) standardization principles, this standard ensures that impervious graphite and carbon piping systems are compatible and reliable in various industrial applications.

Key Topics

• Pipe Sizes: Determines the standard sizes for impervious graphite and carbon pipes to ensure consistency and compatibility across systems. Eight standard pipe sizes are defined.
• Thread Types and Dimensions: Specifies the precise dimensions for both male and female threads used in joining impervious graphite pipe and fittings. Standard thread counts per inch and thread depths are included.
• Physical Dimension Limits: Sets the permissible tolerances for length, inside diameter, outside diameter, and curvature. These ensure the structural integrity and fit of pipes and fittings.
• Material Definitions: Clarifies terminology for impervious graphite (graphite impregnated with resin to resist liquid permeation) and impervious carbon (non-graphitized carbon with similar impregnation).
• Application Scope: Limited strictly to the standardization of physical dimensions and threading for pipes and fittings, supporting consistent manufacturing and assembly practices.

Applications

The ASTM C662-16(2021) standard is widely utilized in industries where chemical resistance, high purity, and durability are required:

• Chemical Processing Plants: For fluid transport systems where impermeable graphite or carbon piping is required to handle corrosive chemicals safely.
• Petrochemical Facilities: In applications involving aggressive fluids or high-purity requirements, impervious graphite pipe systems help prevent leakage and contamination.
• Acid Handling and Storage: Where materials must reliably resist acid exposure without degrading or absorbing liquid.
• Pharmaceutical Manufacturing: Helps maintain purity and prevent contamination through the use of impervious, non-reactive piping systems.
• Corrosive Gas Conduits: For venting or transporting gases that would degrade traditional metal or polymer piping.

Standardized pipe sizes and threading types specified by ASTM C662-16(2021) enable manufacturers and end-users to achieve consistent assembly, maintenance, and system expansion, reducing the risk of leaks and improving overall system reliability.

Related Standards

For organizations working with impervious graphite and carbon piping, additional ASTM and international standards may be relevant, including:

• ASTM C838: Standard Specification for Perforated Graphite Pipes
• ASTM C1165: Standard Test Method for Determining Resistance of Graphite to Chemical Attack
• ASTM C571: Standard Practice for Preparing Codes and Specifications for Graphite Piping Systems
• ISO/TC 226: International standards for materials made from carbon and graphite

Implementing ASTM C662-16(2021) alongside these related standards ensures comprehensive compliance and performance, helping to safeguard critical infrastructure against chemical attack, leaks, and dimensional mismatches.

Key SEO terms: ASTM C662-16, impervious graphite pipe, impervious carbon pipe, graphite pipe threading, standard pipe sizes, ASTM graphite standard, chemical-resistant piping systems, graphite piping dimensions.