ASME B16.5 Pipe Flanges Standard
Engineering definition, metallurgical mechanisms, standard testing specifications, and manufacturing guidelines for closed-die forgings up to 50 kg.
Quick AnswerFeatured
The definitive American standard covering pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for pipe flanges NPS 1/2 through NPS 24.
Technical Explanation & Metallurgical Principles
ASME B16.5 is the global engineering benchmark for steel pipe flanges across Classes 150, 300, 400, 600, 900, 1500, and 2500. It defines strict dimensional requirements for Weld Neck, Slip-On, Blind, Threaded, Socket Weld, and Lap Joint configurations, guaranteeing interchangeability worldwide.
Key Engineering Specifications & Parameters
| Technical Parameter / Metric | Engineering Benchmark / Value |
|---|---|
| Size Scope | NPS 1/2" to 24" (DN 15 to DN 600) |
| Pressure Rating Scope | Class 150# to 2500# (PN 20 to PN 420) |
| Facing Types | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
Application at Jayesh Forge (Rajkot Plant)
Jayesh Forge manufactures 56 standard ASME B16.5 configurations up to 50 kg max piece weight with complete dimensional compliance and EN 10204 3.1 MTC certification.
Related Materials, Standards & Products
Applicable Material Grades
Engineered Product Lines
Related Metallurgical & Testing Terms
Raised Face (RF Flange Facing)
A raised annular gasket sealing surface elevated 1/16" (1.6mm) or 1/4" (6.4mm) above the flange bolt hole circle.
Weld Neck Flange (WN Flange)
The premier high-integrity forged flange configuration featuring a long, tapered circular hub that butt-welds seamlessly to process pipe.
Blind Flange (ASME B16.5 & DIN)
A solid circular forged disk with bolt holes but no central bore, used to terminate the end of a piping run, valve nozzle, or pressure vessel inspection opening.
Flange Pressure Rating Classes (150# to 2500#)
Standardized pressure-temperature designations (Classes 150, 300, 400, 600, 900, 1500, 2500) that define the allowable operating pressure of a flange across temperatures.
Questions Regarding ASME B16.5 Pipe Flanges Standard
Under our strict 50 kg maximum piece weight commitment, Jayesh Forge covers up to 12" NB in Class 150, 8" NB in Class 300, and 4" NB in Class 2500.
Request a Forging Quote with ASME B16.5 Pipe Flanges Standard Compliance
Our Rajkot metallurgy desk is ready to review your technical drawings, testing protocols, and delivery schedules for custom closed-die forgings strictly up to 50 kg.