ASME B16.5 Flanges Guide
Understanding ASME B16.5 Flanges
ASME B16.5 is a widely recognized standard used for pipe flanges and flanged fittings. It establishes requirements relating to flange dimensions, pressure-temperature ratings, materials, tolerances, marking and testing for the products covered by the standard.
For buyers, engineers and procurement teams, specifying the correct size, pressure class, flange type, material and facing is essential when ordering ASME B16.5 flanges.
Vandan Alloys manufactures and supplies ASME B16.5 flanges for industrial piping and process applications in India and international markets.
ASME B16.5 Flange Size Range
ASME B16.5 covers flange sizes from:
NPS 1/2 through NPS 24
The required flange dimensions depend on the nominal pipe size, pressure class, flange type and applicable configuration.
For larger nominal pipe sizes, another applicable standard may be required depending on the project specification.
ASME B16.5 Pressure Classes
ASME B16.5 flanges are available in different pressure classes, including:
Class 150
Class 300
Class 400
Class 600
Class 900
Class 1500
Class 2500
The pressure-temperature capability is not determined by the class number alone. It depends on factors including material group, temperature and applicable requirements of the standard.
ASME B16.5 Flange Types
Depending on the required application, flange requirements may include:
Weld Neck Flanges
Designed for welding directly to the pipe and commonly selected for demanding piping systems.
Blind Flanges
Used to close the end of a pipe, nozzle or piping section.
Slip-On Flanges
Installed by fitting the flange over the pipe before welding.
Socket Weld Flanges
Used with smaller-diameter piping where socket-weld construction is specified.
Threaded Flanges
Designed for threaded pipe connections where welding is not required.
Lap Joint Flanges
Used with a corresponding stub end and allow easier flange rotation during assembly.
Orifice Flanges
Used in applications involving differential-pressure flow measurement arrangements.
ASME B16.5 Flange Facing
Flange facing is an important part of the connection.
Common configurations include:
Raised Face (RF)
Provides a raised sealing surface for the gasket.
Flat Face (FF)
Provides a flat mating surface.
Ring Type Joint (RTJ)
Uses a machined groove for a metallic ring gasket.
The required facing should be clearly specified when placing an order.
ASME B16.5 Flange Dimensions
The dimensions of an ASME B16.5 flange can include:
Outside Diameter, Flange Thickness, Bore, Bolt Circle Diameter, Number of Bolt Holes, Bolt Hole Diameter and Facing Dimensions.
The actual dimensions vary according to the NPS, pressure class, flange type and configuration.
For this reason, a flange should always be identified by its complete specification rather than by size alone.
NPS and DN Identification
ASME B16.5 commonly identifies pipe and flange sizes using NPS – Nominal Pipe Size.
Customers may also provide a corresponding DN designation depending on their project documentation.
When requesting a quotation, it is recommended to provide the exact NPS along with the required flange type and standard.
ASME B16.5 Flange Materials
Flanges covered by ASME B16.5 can be supplied in materials permitted by the applicable specification.
Vandan Alloys supplies flange requirements in materials including:
Stainless Steel
Carbon Steel
Alloy Steel
Duplex Stainless Steel
Super Duplex Stainless Steel
Nickel Alloys
Other Special Alloys
Commonly requested grades can include:
304/304L, 316/316L, 321, 347, 310/310S, 904L, Duplex 2205, Super Duplex 2507 and ASTM A105, along with various nickel alloy grades, subject to the applicable specification.
ASME B16.5 Weld Neck Flanges
Weld Neck Flanges are widely used in process and industrial piping systems.
Their design provides a long tapered hub between the flange ring and pipe connection.
Weld Neck flanges are commonly selected for applications where the piping system requires a robust welded flange connection.
ASME B16.5 Blind Flanges
Blind Flanges are used where a pipe, vessel nozzle or piping branch needs to be closed.
They can also be used where future access or extension of a piping system is anticipated.
Blind flange requirements should specify the correct NPS, class, material, facing and standard.
ASME B16.5 Slip-On Flanges
Slip-On Flanges fit over the pipe and are welded into position.
They are commonly used in suitable industrial piping systems where this connection design is permitted by the project specification.
ASME B16.5 RTJ Flanges
RTJ flanges incorporate a precision-machined ring groove for a metallic ring gasket.
RTJ connections are commonly associated with demanding pressure and temperature applications.
The flange groove and corresponding ring gasket must be compatible with the specified configuration.
ASME B16.5 Flange Marking
Flanges can carry identification markings required by the applicable specification and purchase order.
Marking may include information such as:
Manufacturer Identification
Material Grade
NPS
Pressure Class
Standard
Heat Number
Other Required Identification
Correct marking supports product identification and material traceability.
Inspection & Documentation
Depending on the purchase requirements, ASME B16.5 flange orders can be supplied with relevant quality documentation.
Documentation may include:
Material Test Certificate (MTC)
EN 10204 Type 3.1
Dimensional Inspection Report
Heat Treatment Records, where applicable
Other Agreed Quality Documents
Third-party inspection can also be arranged when required by the customer or project.
ASME B16.5 Standard vs Custom Flanges
Standard ASME B16.5 flanges are produced according to the applicable dimensional and technical requirements.
For special requirements, customers may provide an approved drawing or detailed specification.
Custom machining, special materials or special drilling should be reviewed against the applicable engineering requirements before production.
ASME B16.5 Flanges for International Supply
Vandan Alloys supplies flange requirements for customers in India and overseas markets.
We support enquiries involving:
Standard ASME B16.5 Flanges
Special Flanges
Stainless Steel Flanges
Carbon Steel Flanges
Duplex & Super Duplex Flanges
Nickel Alloy Flanges
High-Pressure Flanges
Export orders can be supplied with suitable documentation and export packing according to the agreed requirement.
How to Order ASME B16.5 Flanges
For a clear quotation, provide:
NPS + Flange Type + Material Grade + Class + Facing + Standard + Quantity + Delivery Location
Example:
6" WNRF – ASTM A182 F316L – Class 600 – RF – ASME B16.5 – 20 Nos
This information allows the flange requirement to be identified more accurately.
Vandan Alloys – ASME B16.5 Flange Manufacturer & Exporter
Vandan Alloys manufactures and supplies industrial flanges from India for piping, process and engineering applications.
We offer flange requirements in different sizes, pressure classes, materials, facings and configurations according to customer specifications.
Our focus is on correct specification, dimensional requirements, material traceability, quality documentation and reliable export supply.
For ASME B16.5 flange enquiries, send your complete requirement to our team.
Request a Quotation
Vandan Alloys
Manufacturer of All Types of Flanges
3/5, Sakar Bhavan, Ground Floor, 6th Khetwadi lane, SVP Road ,Mumbai – 400 004. India
TEL+91 022 6610 9925Mobile no: 09892882255 GSTIN: 27AUMPS2067F1ZB
Email: info@vandanalloys.com ; Web: www.vandanalloys.com
Please visit Our Flanges Division:www.vandanalloys.net
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ASME B16.5 flange guide covering NPS sizes, pressure classes, flange types, materials, facings and dimensions. Vandan Alloys supplies flanges from India.
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