ASTM C662-16(2021)

Standard Specification for Impervious Graphite Pipe and Threading

ABSTRACT
This specification covers standardization of pipe sizes and thread types used to join impervious graphite pipe and fittings. This specification may also be applied to impervious carbon pipe and fittings. Physical dimensions of impervious graphite and carbon pipes and threads shall be within the limits indicated in this specification.
SCOPE
1.1 This specification covers the standardization of the pipe sizes and types of threads used to join impervious graphite pipe and fittings. The thread standards may also be applied to impervious carbon pipe and fittings. It is limited to physical dimensions.  
1.2 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 30-Sep-2021
• ICS: 23.040.50 - Pipes and fittings of other materials
• Technical Committee: D02 - Petroleum Products, Liquid Fuels, and Lubricants
• Drafting Committee: D02.F0 - Manufactured Carbon and Graphite Products

Overview

ASTM C662-16(2021), Standard Specification for Impervious Graphite Pipe and Threading, sets forth the international requirements for the physical dimensions and thread types used in impervious graphite pipe and fittings. This standard, published by ASTM International, provides a key reference for organizations involved in the manufacture, supply, and installation of impervious graphite and impervious carbon pipe systems. By adhering to this specification, manufacturers and users ensure compatibility, quality, and reliability in applications that require resistance to liquid penetration.

Key Topics

• Pipe Sizing Standardization: Specifies eight standard pipe sizes, detailing permissible variations in inside diameter, outside diameter, and length for impervious graphite pipe.
• Thread Specifications: Defines the types, dimensions, and tolerances for both male and female threads used for joining pipes and fittings. Notably, standard metric threads for impervious graphite pipe are not established under this specification.
• Material Definitions: Clarifies what constitutes impervious graphite and impervious carbon, both involving impregnation with a resinous material to render the materials impervious to liquids within specified operating ranges.
• International Principles: Developed in accordance with globally recognized standardization principles, specifically referencing the World Trade Organization Technical Barriers to Trade (TBT) Committee guidelines.
• Limitation to Physical Dimensions: The scope is specifically limited to standardization of physical pipe and thread dimensions, not addressing material performance or chemical properties.

Applications

ASTM C662-16(2021) is applicable in numerous industries and contexts where impervious graphite or impervious carbon pipe systems are required, particularly where prevention of fluid permeation is critical.

• Chemical Processing: Used in piping systems handling aggressive or corrosive liquids, where leakage prevention is essential.
• Petrochemical Facilities: Suitable for fluid transfer systems demanding high corrosion resistance and minimal leak risk.
• Industrial Equipment: Applied in manufacturing settings that require maintenance-free, long-lasting pipework with reliable joint integrity.
• Replacement Parts and Maintenance: Ensures standardized dimensions for compatibility and interchangeability of pipes and fittings in existing installations.

Organizations relying on this standard benefit from improved system integrity, easier maintenance, parts replacement, and enhanced safety through adherence to reliable dimensional and threading requirements.

Related Standards

To ensure comprehensive compliance and best practice in piping systems, the following related standards may also be relevant:

• ASTM C568: Standard Specification for Carbon and Graphite Structural Shapes
• ASTM C747: Standard Test Method for Modulus of Rupture of Graphite Electrodes and Graphite Sulfur Resistors
• ISO Standards: International equivalents and supporting documents on dimensions and properties of industrial pipes
• WTO TBT Principles: Guidelines on standardization and regulatory harmonization

Practical Value

Adopting ASTM C662-16(2021) helps manufacturers, engineers, and suppliers:

• Achieve interoperability in piping systems using industry-accepted pipe and threading dimensions
• Minimize the risk of leaks through standardized impervious graphite or carbon materials
• Facilitate global trade and acceptance of products through compliance with internationally developed standards
• Reduce installation and maintenance errors thanks to precise, uniform specifications

ASTM C662-16(2021) is a critical standard for quality assurance and engineering consistency in the use of impervious graphite pipe and threading for high-integrity industrial applications.

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C662 −16 (Reapproved 2021)
Standard Specification for
Impervious Graphite Pipe and Threading
This standard is issued under the fixed designation C662; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2.1.1 impervious carbon, n—manufactured non-graphitized
structural carbon that has been impregnated with a resinous
1.1 This specification covers the standardization of the pipe
material to make the final article impervious to liquids in the
sizes and types of threads used to join impervious graphite pipe
recommended operating range.
and fittings. The thread standards may also be applied to
2.1.2 impervious graphite, n—manufactured graphite that
impervious carbon pipe and fittings. It is limited to physical
has been impregnated with a resinous material to make the final
dimensions.
article impervious to liquids in the recommended operating
1.2 This international standard was developed in accor-
range.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
3. Requirements for Impervious Graphite Pipe
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical 3.1 The eight standard pipe sizes are shown in Table 1 with
Barriers to Trade (TBT) Committee. permissible variations in dimensions.
3.2 Fig. 1 gives the male thread dimensions for impervious
2. Terminology
graphite pipe.
2.1 Definitions:
3.3 Fig. 2 gives the female thread dimensions for impervi-
ous graphite fittings.
This specification is under the jurisdiction of ASTM Committee D02 on
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
Subcommittee D02.F0 on Manufactured Carbon and Graphite Products. 4. Keywords
Current edition approved Oct. 1, 2021. Published November 2021. Originally
4.1 impervious carbon pipe; impervious graphite pipe;
approved in 1970. Last previous edition approved in 2016 as C662 – 16. DOI:
10.1520/C0662-16R21. threading specifications
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C662 − 16 (2021)
TABLE 1 Physical Dimensions of Impervious Graphite Pipe
Pipe Size Typical Limits
A
Length
(nominal
Inside Diameter Outside Diameter
Inside
min max min max in. mm
Diameter),
+ ⁄4 −0 +60 −0
in.
in. mm in. mm in. mm in. mm
15 1 31 9
1 ⁄16 23.8 1 ⁄16 27.0 1 ⁄64 37.7 1 ⁄16 39.7 108 2740.
1 7 9 61 1
1 ⁄2 1 ⁄16 36.5 1 ⁄16 39.7 1 ⁄64 49.6 2 ⁄16 52.4 108 2740.
15 1 11 13
21 ⁄16 49.2 2 ⁄16 52.4 2 ⁄16 68.3 2 ⁄16 71.4 108 2740.
15 1 3
32 ⁄16 74.6 3 ⁄4 82.6 4 101.6 4 ⁄16 106.4 108 2740.
15 1 1 1
43 ⁄16 100.0 4 ⁄4 108.0 5
...