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ASME B16.5 Flanges
Forged Carbon Steel, Stainless Steel & Alloy Steel Flanges | NPS 1/2″–24″ | Class 150–2500
ASME B16.5 flanges including Weld Neck, Slip-On, Blind, Socket Weld, Threaded and Lap Joint flanges. For stockists, distributors, EPC contractors and industrial project buyers, we provide bulk export supply with material traceability, inspection documentation and technical support.
Material is available in carbon steel, stainless steel and alloy steel grades for oil & gas, petrochemical, refinery, power generation, water treatment, and other industrial piping applications.
Note: Pressure-temperature ratings depend on the applicable material group and operating temperature. The required class should always be confirmed together with material, temperature and project specifications. JS FITTINGS supplies the main flange configurations used in industrial piping systems. Weld Neck (WN) Flanges are forged flanges with a tapered hub designed for butt welding to the pipe. They are commonly selected for piping systems where pressure, temperature, mechanical loading and fatigue resistance are important. Typical applications include: For Weld Neck Flanges, the bore should be confirmed according to the connected pipe size and wall thickness. Slip-On (SO) Flanges are designed to slide over the pipe and are normally attached by fillet welding. They are widely used where installation simplicity and cost efficiency are important. Typical applications include: Available in different materials, pressure classes and facing configurations according to project requirements. Blind Flanges (BL) have no center bore and are used to close the end of a pipe, valve, pressure vessel or other piping component. They are commonly used for: Because a blind flange is exposed to the internal pressure of the closed system, the correct pressure class, material and thickness are particularly important. Socket Weld (SW) Flanges are commonly used for smaller-diameter piping systems where the pipe is inserted into the flange bore and welded. They are widely selected for: Socket Weld Flanges are available in carbon steel, stainless steel and alloy steel grades. Threaded Flanges, also called Screwed Flanges, have an internal thread that connects with an externally threaded pipe. They can be used where welding is undesirable or restricted, depending on the application and project specification. Common thread options include: Threaded flange selection should consider pipe thread type, pressure class, material and service conditions. Lap Joint Flanges are normally used together with a Stub End. The flange can rotate around the pipe connection, making bolt-hole alignment easier during installation. They are useful for piping systems requiring: Lap Joint Flanges are particularly useful when stainless steel or other higher-cost pipe materials are required while the backing flange can be manufactured from a more economical material. ASME B16.5 includes several pressure classes: The Class number should not be treated as a direct maximum working pressure in PSI. Actual allowable pressure depends on factors including: For this reason, a quotation should specify the flange class together with material and operating conditions. The flange facing affects gasket selection and sealing performance. Raised Face is one of the most widely used facing configurations for industrial steel flanges. The raised sealing surface concentrates the gasket load around the sealing area. Common applications: Flat Face flanges have a flat sealing surface. They are commonly specified where the connected equipment or piping system requires a flat-face connection. The FF configuration should be matched with the appropriate gasket and mating flange. RTJ flanges contain a machined ring groove designed for a metal ring gasket. They are commonly selected for demanding high-pressure and high-temperature services, particularly in oil & gas and petrochemical applications. When ordering RTJ flanges, the flange type, groove configuration and corresponding gasket requirements should be confirmed. Common carbon steel grades include: ASTM A105 is widely used for forged carbon steel flanges in industrial piping systems. A350 LF2 is commonly specified where low-temperature service requirements need to be considered. Common stainless steel grades include: These grades can be selected for applications requiring improved corrosion resistance or specific process-service performance. Common alloy steel flange materials include: The appropriate alloy grade should be selected according to the operating temperature, pressure and project material specification. For example, a typical RF flange RFQ should not only state NPS 6 Class 300. The supplier may also need to confirm: For project orders, JS FITTINGS can provide the corresponding dimensional information and technical confirmation before production. One of the most important points when ordering a Weld Neck or other bored flange is the bore dimension. A flange may have the same nominal pipe size and pressure class but require a different bore depending on the connected pipe wall thickness. For industrial project orders, flange identification and material traceability are important parts of quality control. Depending on the order requirements, flange markings may include information such as: Heat-number traceability can be linked to the material documentation supplied with the order. JS FITTINGS provides inspection and documentation options according to the customer’s project requirements. Critical flange dimensions are checked against the applicable drawing and standard. PMI can be arranged to verify the material composition of the supplied flange. Ultrasonic testing can be arranged where required by the purchase specification. MPI can be provided for applicable forged components and project requirements. EN 10204 3.1 MTC can be supplied for applicable orders, including material and mechanical test information. Customers can arrange independent inspection through recognized inspection agencies according to the project requirements. After machining and inspection, flange surfaces can be protected according to the transportation and project requirements. Available options include: For export shipments, flange protection and packing should be considered together with the destination, transportation method and storage conditions. ASME B16.5 flanges are widely used throughout industrial piping systems. Used for pipelines, gathering systems, refineries, terminals and process facilities. Used for process piping, equipment connections and fluid transfer systems. Used in steam, cooling water and auxiliary piping systems. Used for pumps, valves, pipelines and treatment equipment connections. Used in slurry, water, compressed air and process piping systems. Suitable for engineering, procurement and construction projects requiring documented flange specifications and inspection. A common question from buyers is whether to use ASME B16.5 or ASME B16.47. The basic distinction is the nominal size range. If your requirement is NPS 1/2″–24″, ASME B16.5 is normally the applicable flange dimensional standard. For large-diameter flanges from NPS 26″ and above, ASME B16.47 should be considered. JS FITTINGS supplies both ASME B16.5 and ASME B16.47 flange solutions, allowing customers to select the applicable standard according to the pipe size and project specification. More ASME B16.5 vs ASME B16.47 flange , please click here. For a fast and accurate quotation, please provide as much of the following information as possible: Providing these details allows our sales and technical team to review the requirement and prepare a more accurate quotation. JS FITTINGS is a China-based manufacturer and exporter of industrial steel flanges, butt weld pipe fittings and steel pipes. Our flange product range covers common international standards and configurations for overseas stockists, distributors, EPC contractors and industrial project customers. In addition to ASME B16.5, JS FITTINGS supplies flanges according to applicable: Project-specific requirements can also be reviewed before production. Our customers are not limited to individual replacement purchases. JS FITTINGS works with: For bulk orders, we can coordinate production, inspection, documentation, packing and export shipment according to the agreed purchase requirements. If you are sourcing ASME B16.5 carbon steel flanges in bulk, please send us your size, class, material, flange type, facing and quantity. We will review the requirement and provide a practical quotation. ASME B16.5 covers pipe flanges and flanged fittings from NPS 1/2″ through NPS 24″. For larger nominal sizes, ASME B16.47 should be considered. The standard includes Class 150, 300, 400, 600, 900, 1500 and 2500. The allowable pressure depends on the material and operating temperature, so the Class should not be considered independently. Common materials include ASTM A105/A105N carbon steel, ASTM A350 LF2, ASTM A182 stainless steel and alloy steel grades. The correct material should be selected according to the project specification and service conditions. JS FITTINGS supplies: Other special flange configurations can be reviewed according to drawings and project requirements. Yes. Class 150 is one of the commonly requested pressure classes. We can supply different flange types, materials, sizes and facing configurations according to the purchase requirement. Yes. Higher pressure classes are available according to the applicable size, material and project specification. Yes. EN 10204 3.1 Mill Test Certificates can be provided according to the order requirements. Yes. Third-party inspection can be arranged according to the customer’s requirements and agreed inspection plan. Yes. For flanges where bore dimensions are important, such as Weld Neck Flanges, please provide the connected pipe size and schedule so the bore can be confirmed correctly. Have a flange requirement? Flange Type + Size + Class + Material + Facing + Bore/Schedule + Quantity + Inspection Requirements Our team will review your specification and provide a quotation based on your actual requirement. JS FITTINGS Industrial Steel Flanges | Butt Weld Pipe Fittings | Steel Pipes Email: admin@jsfittings.com WhatsApp: +86 180 0311 9682ASME B16.5 Flanges Specifications
Item
Specification
Standard
ASME B16.5 / ANSI B16.5
Nominal Size
NPS 1/2″–24″ (DN15–DN600)
Pressure Classes
Class 150, 300, 400, 600, 900, 1500, 2500
Flange Types
WN, SO, BL, SW, Threaded, Lap Joint
Materials
Carbon Steel, Stainless Steel, Alloy Steel
Carbon Steel Grades
ASTM A105 / A105N, ASTM A350 LF2
Stainless Steel Grades
ASTM A182 F304/304L, F316/316L, F321, F347
Alloy Steel Grades
ASTM A182 F5, F9, F11, F22, F91
Facing
RF, FF, RTJ, M&F, T&G where applicable
Bore
According to pipe size and wall thickness / schedule
Surface Treatment
Anti-rust oil, painting, galvanizing upon request
Inspection
Dimensional Inspection, PMI, UT, MPI and other inspection options
Documentation
EN 10204 3.1 MTC available
Third-Party Inspection
SGS, BV and other inspection agencies upon request
ASME B16.5 Flange Types
1. ASME B16.5 Weld Neck Flanges
2. ASME B16.5 Slip-On Flanges
3. ASME B16.5 Blind Flanges
4. ASME B16.5 Socket Weld Flanges
5. ASME B16.5 Threaded Flanges
6. ASME B16.5 Lap Joint Flanges
ASME B16.5 Pressure Classes
Class
Typical Designation
Class 150
150#
Class 300
300#
Class 400
400#
Class 600
600#
Class 900
900#
Class 1500
1500#
Class 2500
2500#
ASME B16.5 Flange Facing Types
Raised Face — RF
Flat Face — FF
Ring Type Joint — RTJ
ASME B16.5 Flange Materials
Carbon Steel
Stainless Steel
Alloy Steel
ASME B16.5 Flange Dimensions
Flange Bore and Pipe Schedule
ASME B16.5 Flange Marking & Traceability
Inspection & Quality Documentation
Dimensional Inspection
PMI — Positive Material Identification
UT — Ultrasonic Testing
MPI — Magnetic Particle Inspection
MTC — Mill Test Certificate
Third-Party Inspection
Surface Treatment & Flange Protection
Applications of ASME B16.5 Flanges
Oil & Gas
Petrochemical & Chemical
Power Generation
Water Treatment
Mining & Industrial Processing
EPC Projects
ASME B16.5 vs ASME B16.47
Standard
Main Size Range
ASME B16.5
NPS 1/2″–24″
ASME B16.47
NPS 26″–60″
How to Order ASME B16.5 Flanges
WN / SO / BL / SW / Threaded / LJ
ASME B16.5
For example: NPS 6
Class 150 / 300 / 400 / 600 / 900 / 1500 / 2500
For example: ASTM A105
RF / FF / RTJ
For example: SCH 40 / SCH 80 / SCH 160
Number of pieces required
MTC / PMI / UT / MPI / Third-Party Inspection / Other project requirementsExample RFQ
Why Buy ASME B16.5 Flanges from JS FITTINGS?
Manufacturing Capability
Quality & Documentation
International Standards
Bulk Supply for Stockists, Distributors & Industrial Projects
Frequently Asked Questions
What sizes are covered by ASME B16.5?
What pressure classes are available under ASME B16.5?
What materials can be used for ASME B16.5 flanges?
What types of ASME B16.5 flanges can you supply?
Can you supply ASME B16.5 Class 150 flanges?
Can you supply Class 600, Class 900 or Class 1500 flanges?
Do you provide MTC?
Can I arrange third-party inspection?
Can you supply flanges for a specific pipe schedule?
Request a Quote for ASME B16.5 Flanges
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