ASME B16.20-2023 PDF

Full title and description

ASME B16.20-2023 — Metallic Gaskets for Pipe Flanges. This standard specifies materials, dimensions, tolerances and marking requirements for metal ring‑joint gaskets, spiral‑wound metal gaskets, metal‑jacketed gaskets (and filler material) and grooved metal gaskets with covering layers intended for use with pipe flanges.

Abstract

ASME B16.20-2023 provides dimensional and material requirements and marking/identification rules for metallic gaskets designed to fit flanges described by reference flange standards (for example ASME B16.5 and ASME B16.47) and API/ISO flange specifications. It addresses spiral‑wound and jacketed gasket types for raised‑face and flat‑face flanges and includes tolerances, acceptable materials and general application guidance for manufacturers, specifiers and end users.

General information

• Status: Current — placed on stabilized maintenance (ASME).
• Publication date: Edition 2023 (published December 22, 2023; ASME product page lists the B16.20:2023 edition while some vendor listings reference late‑2023 publication). For clarity: the 2023 edition is identified as B16.20:2023.
• Publisher: American Society of Mechanical Engineers (ASME).
• ICS / categories: Flanges / piping components; Seals for pipe and hose assemblies — typically classified under ICS codes in the 23.040.x group (for example 23.040.60 / 23.040.80 for related gasket and flange standards).
• Edition / version: 2023 (B16.20:2023). Supersedes ASME B16.20‑2017.
• Number of pages: 60 pages (ASME product listing). Note: page counts reported by commercial resellers vary slightly (e.g., 60–62 pages).

Scope

Specifies requirements for metallic gaskets used with pipe flanges — including ring‑joint gaskets, spiral‑wound gaskets, metal‑jacketed gaskets and grooved metal gaskets with covering layers — and gives dimensions, tolerances, acceptable materials and marking procedures. Gaskets covered are dimensionally suitable for use with flanges described in ASME B16.5, ASME B16.47, API Specification 6A and ISO 10423 (as applicable). The standard addresses gasket types for raised‑face and flat‑face flanges and is intended to support interchangeability, traceability and safe selection/application of metallic gaskets.

Key topics and requirements

• Definitions and classification of metallic gasket types (ring‑joint, spiral‑wound, jacketed, grooved metal with covering layers).
• Dimensional tables and tolerances to ensure compatibility with referenced flange standards.
• Material selection and acceptable combinations of metal and filler/covering materials.
• Marking, identification and traceability requirements for manufactured gaskets.
• Application notes for raised‑face and flat‑face flanges and guidance on selecting gasket types for flange classes and services.
• Quality and conformity considerations; the standard is maintained under ASME stabilized maintenance to accept industry change requests.

Typical use and users

Used by gasket and flange manufacturers, piping designers, plant engineers, procurement/specification teams, inspection/test personnel and maintenance crews in oil & gas, petrochemical, power generation, process industries and any industry using ASME‑specified flanged piping systems. It is referenced when specifying gasket geometry, material and marking to ensure interchangeability and safe sealing performance.

Related standards

Commonly used alongside ASME B16.5 (Pipe Flanges and Flanged Fittings), ASME B16.47 (Large Diameter Steel Flanges), API Specification 6A (for wellhead and Christmas tree equipment), ISO 10423 and other flange/gasket dimension and testing standards (for example ISO/EN gasket standards). Users should apply B16.20 together with the appropriate flange standard for correct gasket/flange compatibility.

Keywords

metallic gaskets; spiral‑wound; ring‑joint; jacketed gasket; flange gasket; pipe flange; ASME B16.20; gasket dimensions; gasket materials; flange compatibility.

FAQ

Q: What is this standard?

A: ASME B16.20‑2023 is the ASME standard that specifies materials, dimensions, tolerances and marking requirements for metallic gaskets intended for use with pipe flanges.

Q: What does it cover?

A: It covers ring‑joint, spiral‑wound, metal‑jacketed and grooved metal gaskets with covering layers — including dimensional tables, tolerances, material guidance and marking/identification rules — for use with flanges (raised face and flat face) described by relevant flange standards.

Q: Who typically uses it?

A: Manufacturers of gaskets and flanges, piping and mechanical designers, specifiers, procurement and QA/QC staff, plant maintenance and inspection personnel across industries such as oil & gas, petrochemical, power and general process engineering.

Q: Is it current or superseded?

A: Current. B16.20:2023 is the latest edition and replaces ASME B16.20‑2017; ASME has placed the document on stabilized maintenance so it remains in effect until formally revised. Note: commercial listings may show small variations in published page count or publication metadata.

Q: Is it part of a series?

A: Yes — it is part of the ASME B16 family of piping and flange standards (e.g., B16.5, B16.47) addressing dimensions and interoperability of flanges, fittings and gaskets used in piping systems.

Q: What are the key keywords?

A: Metallic gasket, spiral‑wound, ring‑joint, jacketed gasket, flange gasket, flange compatibility, ASME B16.20.