Flange
Flange dimension, rating, and face standards for process and waterworks piping.
ASME B16.5
ASMEPipe Flanges and Flanged Fittings
ASME B16.5 is the foundational standard for pipe flanges and flanged fittings globally. It establishes the comprehensive dimensional and pressure-temperature rating system for flanges up to 24 inches. This standard ensures that flanges from different manufacturers are completely interchangeable, facilitating safe and modular construction of high-pressure piping systems.
ASME B16.47 Series A
ASMELarge Diameter Steel Flanges — Series A (MSS SP-44 basis)
ASME B16.47 Series A specifies the dimensions and ratings for large diameter steel flanges (NPS 26 to NPS 60). Originally based on the MSS SP-44 standard, Series A flanges are heavier, thicker, and designed for rigorous pipeline and heavy industrial applications.
ASME B16.47 Series B
ASMELarge Diameter Steel Flanges — Series B (API 605 basis)
ASME B16.47 Series B specifies dimensions and ratings for large diameter flanges (NPS 26 to NPS 60). Originally based on API 605, Series B flanges are engineered to be lighter and more compact, requiring more bolts of smaller diameter to maintain the gasket seal.
ASME B16.36
ASMEOrifice Flanges
ASME B16.36 specifies dimensions and tolerances for orifice flanges. These are specialized flanges equipped with pressure tap holes used in conjunction with orifice plates to measure the flow rate of liquids and gases in piping systems.
ASME B16.1
ASMECast Iron Pipe Flanges and Flanged Fittings
ASME B16.1 covers the dimensional and pressure-temperature rating requirements for gray cast iron pipe flanges and flanged fittings. It is predominantly used in low-pressure, ambient-temperature services like municipal water, wastewater, and HVAC systems.
ASME B16.24
ASMECast Copper Alloy Pipe Flanges and Flanged Fittings
ASME B16.24 specifies requirements for cast copper alloy (brass and bronze) flanges. These are used primarily in marine environments, seawater cooling systems, and specialized oxygen or potable water services where corrosion resistance and non-sparking properties are required.
API 6A
APIWellhead and Christmas Tree Equipment
API 6A is the primary standard for wellhead and christmas tree equipment used in upstream oil and gas production. It includes specifications for extremely high-pressure flanges (up to 20,000 psi) designed to contain subterranean reservoir pressures at the wellbore.
API 605
APILarge Diameter Carbon Steel Flanges (historical)
API 605 was the historical standard developed by the American Petroleum Institute for large diameter, compact flanges used in refineries. It has been officially withdrawn and incorporated into ASME B16.47 as "Series B".
EN 1092-1
ENCircular Flanges for Pipes, Valves and Fittings (PN designated)
EN 1092-1 is the European standard for steel flanges. Instead of the American "Class" system (e.g., Class 150), it uses the Nominal Pressure (PN) designation system (e.g., PN16, PN40), which roughly corresponds to the allowable pressure in bars at room temperature.
JIS B2220
JISSteel Pipe Flanges
JIS B2220 specifies steel pipe flanges for the Japanese industrial system. It utilizes the "K" rating system (e.g., 5K, 10K, 20K) to designate pressure classes, representing the working pressure in kgf/cm² at ambient temperature.
AWWA C207
AWWASteel Pipe Flanges for Waterworks Service
AWWA C207 is the American Water Works Association standard for steel ring and blind flanges intended for water and wastewater service. It is designed to be a highly cost-effective, lighter alternative to ASME B16.5 for massive water pipelines operating at ambient temperatures and low pressures.
ASME B16.48
ASMELine Blanks
Dimensions, ratings, materials, marking, and tolerances for spectacle blinds, spades, and spacers installed between flanges.
ASTM A694
ASTMCarbon and Alloy Steel Forgings for High-Pressure Transmission-Service Components
Material requirements for forged flanges, fittings, valves, and parts for high-pressure transmission service.
ASME B16.47
ASMELarge Diameter Steel Flanges
Family reference for large-diameter steel flanges covering Series A and Series B dimensional systems.
MSS SP-44
MSSSteel Pipeline Flanges
Pressure-temperature ratings, materials, dimensions, tolerances, and marking for steel pipeline flanges.