Slip-On Flange (SO Flange)
Engineering definition, metallurgical mechanisms, standard testing specifications, and manufacturing guidelines for closed-die forgings up to 50 kg.
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A forged pipe flange designed to slide over the outer diameter of process pipe and be secured using two fillet welds (one internal and one external).
Technical Explanation & Metallurgical Principles
Slip-on flanges (SO) feature an inside diameter slightly larger than the outside diameter of the matching pipe. They are favored for lower initial material and alignment costs in low-to-medium pressure piping systems (Classes 150# to 600#).
Key Engineering Specifications & Parameters
| Technical Parameter / Metric | Engineering Benchmark / Value |
|---|---|
| Welding Connection | Dual fillet weld (inside bore and hub back) |
| Pressure Scope | Class 150# to 1500# (primarily 150# and 300#) |
| Bore Tolerance | +0.8mm / -0.0mm per ASME B16.5 |
Application at Jayesh Forge (Rajkot Plant)
Drop-forged in Rajkot from ASTM A105 and SS 304L/316L strictly up to 50 kg for commercial process and water distribution manifolds.
Related Materials, Standards & Products
Related Metallurgical & Testing Terms
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.
ASME B16.5 Pipe Flanges Standard
The definitive American standard covering pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for pipe flanges NPS 1/2 through NPS 24.
Questions Regarding Slip-On Flange (SO Flange)
The abrupt dual-fillet weld geometry creates higher stress concentrations than the smooth tapered butt-weld transition of a weld neck flange.
Request a Forging Quote with Slip-On Flange (SO Flange) 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.