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ASME B16.20-2023

Metallic Gaskets for Pipe Flanges
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ASME B16.20-2023

Metallic Gaskets for Pipe Flanges

PUBLISH DATE 2023
PAGES 246
ASME B16.20-2023

Purpose of ASME B16.20-2023

ASME B16.20-2023, titled Metallic Gaskets for Pipe Flanges, is a standard developed and published by the American Society of Mechanical Engineers (ASME). Its primary purpose is to establish dimensions, tolerances, materials, and marking requirements for metallic gaskets used in flanged piping connections, including spiral-wound, ring-joint, and jacketed gaskets. The standard ensures sealing performance, reliability, and compatibility in high-pressure and high-temperature piping systems, minimizing risks of leaks, blowouts, or system failures. It provides standardized specifications to promote safety and interoperability across industries by ensuring gaskets meet the requirements of specific flange designs and service conditions.

Typical Use

ASME B16.20-2023 is typically applied in the design, procurement, installation, and maintenance of gasketed flange connections in industries such as oil and gas, chemical processing, power generation, and petrochemicals. Common applications include:

  • Pipeline systems: Sealing flange joints in oil, gas, or chemical transport pipelines.
  • Refinery and process plants: Ensuring leak-tight connections in high-pressure and high-temperature process piping.
  • Power generation: Sealing steam or water lines in boilers, turbines, or heat exchangers.
  • Industrial HVAC systems: Providing reliable seals in large-scale heating and cooling systems.

Engineers, manufacturers, and maintenance professionals use the standard during project phases to:

  • Select appropriate gasket types and materials (e.g., spiral-wound with stainless steel and graphite, or ring-joint gaskets with soft iron or alloy) based on flange type, pressure class, and service conditions.
  • Ensure dimensional compatibility with ASME B16.5 or API 6A flanges, including inner and outer diameters, thickness, and ring-joint groove numbers.
  • Specify material properties, such as corrosion resistance or temperature limits, to match environmental and operational demands.
  • Verify quality and performance through inspection, ensuring gaskets meet marking requirements and tolerances for proper installation and sealing.

The standard is often used in conjunction with other ASME standards, such as B16.5 for pipe flanges or B31.3 for process piping, and is referenced in engineering specifications, procurement contracts, and industry regulations. The 2023 edition includes updates such as revised material specifications, refined tolerances for spiral-wound gaskets, and clarifications on marking requirements, reflecting advancements in gasket manufacturing and sealing technology.

SDO ASME: American Society of Mechanical Engineers
Document Number B16.20
Publication Date Dec. 22, 2023
Language en - English
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