Ansi B16.5 Stainless Steel Flange Class 150 Dn125 Forged So Flange

Ansi B16.5 Stainless Steel Flange Class 150 Dn125 Forged So Flange

Core Features

  • American National Standard Compliance (ASME/ANSI B16.5): Precision-machined to conform strictly to ASME/ANSI B16.5 dimensional blueprints. This ensures 100% bolt-pattern, alignment, and pitch circle diameter (PCD) interchangeability across standard global Class 150 pipelines, valves, and vessel connections.
  • DN125 / 5-Inch Nominal Standard Sizing: Engineered with a precision-machined clearance internal bore optimized to slide smoothly over standard DN125 (5-Inch Nominal Pipe Size) stainless steel piping networks or industrial process loops.
  • Forged Structural Density: Hot-forged from premium austenitic stainless steel stock (typically available in low-carbon 304L or 316L grades). This mechanical process refines the internal grain matrix and completely eliminates casting porosities, internal air pockets, and structural micro-voids, providing an exceptionally high burst-pressure threshold.
  • Low-Profile Slip-On (SO) Hub Profile: Features a low-profile raised hub or collar surrounding the center bore. This architecture distributes mechanical and thermal stress more effectively than a standard hubless plate ring, making it highly resilient under systemic line vibration.
  • Double Fillet Weld Joint Security: Attached to the pipeline by sliding directly over the outer diameter of the pipe and securing via both an external fillet weld around the hub neck and an internal fillet weld along the inside bore face, creating a high-integrity, leak-proof mechanical joint.

At Kriloha Gaskets & Hardware, we recognize that modern processing networks require components that combine standard pipeline security with specialized material versatility. Our ASME/ANSI B16.5 Class 150 Stainless Steel Forged DN125 Slip-On (SO) Flanges represent our engineered answer for “High-Load-Joint-Security” and “Zero-Flexing-Integrity” across primary processing arrays. Operating from our high-precision automated manufacturing hubs, Kriloha bridges the gap between raw metallurgy and exact geometric perfection, ensuring every slip-on flange functions flawlessly alongside your high-performance sealing gaskets.

The engineering of our DN125 stainless slip-on program is founded on Microstructural Uniformity and Deflection-Resistant Flatness. Rather than relying on lower-cost, unpredictable casting techniques that leave hidden internal air pockets or structural micro-cracks, Kriloha utilizes fully certified, hot-forging paths. By forcing the internal metal grain flow to trace the contour of the flange ring and low-profile hub, our components offer exceptional tensile strength. They comfortably withstand high bolt-torque loads across the 8-bolt ANSI circle without warping or bowing over time. The “L-Grade” low-carbon threshold (in our 304L/316L offerings) prevents intergranular corrosion cracking along the weld line, making it perfect for field installations where subsequent heat treatment is impractical. At Kriloha, we precision-machine the flat sealing surface on advanced CNC turning centers, finishing them with controlled phonographic serrations ( finish) that mechanically grip the gasket matrix to resist blowout under sudden system pressure cycles.

Manufacturing and provisioning these critical high-grade components involves strict Dimensional Tolerance Checks, Volumetric Material Inspections, and Surface Roughness Calibration. We collaborate directly with your project engineering, procurement, and facility maintenance teams to supply precise internal bores tailored to standard pipe outer diameters and unique wall-thickness schedules (such as Schedule 10S or Schedule 40S matching). By choosing Kriloha Gaskets & Hardware, you are investing in a “Future-Proof” industrial partnership that prioritizes your system’s lifetime reliability through superior metallurgy and micro-tolerance engineering.

Primary Industrial Applications

  • Hygienic Process Pipelines: Clean-utility networks in food processing, beverage bottling lines, dairy plants, and cosmetics manufacturing where smooth, non-porous stainless steel prevents fluid contamination and survives clean-in-place (CIP) steam washdowns.
  • Moderate-Pressure Plant Utilities: Ideal for primary factory utility lines distributing high-pressure industrial water, cooling tower loops, factory compressed air networks, and inert gas loops.
  • Chemical Processing & Reagent Transfer: High-reliability connection interfaces for industrial processing loops transporting volatile solvents, organic and inorganic acids, industrial reagents, and corrosive chemical waste.
  • Water Treatment & Environmental Utilities: High-density interfaces for chemical dosing skids, municipal wastewater filtration networks, and corrosive fluid drainage manifolds.
  • Modular Industrial Process Skids: Compact structural mounting flanges used to securely link prefabricated small-to-mid diameter piping manifolds directly to raised-face valves, strainers, instrumentation blocks, and storage vessels.

Frequently Asked Questions (FAQs)

What is the structural difference between a Slip-On (SO) flange and a standard Flat Plate flange?

While both types slide over the pipe outer diameter and utilize double fillet welding, a standard plate flange is completely flat and collarless. A Slip-On flange features a low-profile raised hub or collar surrounding the center bore. This hub provides additional structural reinforcement at the weld zone, helping to distribute pipeline stresses and making it better suited for slightly higher mechanical loads or vibration profiles compared to a completely flat, hubless plate flange.

What are the standardized bolt hole dimensions for a DN125 / 5-Inch Class 150 Slip-On flange?

According to the ASME B16.5 Class 150 standard, a 5-inch (DN125) flange features an outer diameter of 10.0 inches (254 mm) and a bolt circle diameter of 8.50 inches (215.9 mm). It utilizes 8 bolt holes designed to accommodate 3/4-inch diameter bolts or stud bolts.

What specific welding configuration is required to install an ASME Slip-On flange?

A slip-on flange requires a double fillet weld configuration for proper code-compliant installation:

One robust fillet weld around the exterior where the hub neck meets the outer diameter of the pipe wall.

A secondary fillet weld inside the bore, where the pipe end is slid back slightly (typically equal to the pipe wall thickness plus 3mm) from the flange face to prevent damaging the sealing surface during field welding.

When should I select Grade 304L stainless steel over Grade 316L for this product?

Grade 304L is highly economical and excellent for freshwater processing, commercial HVAC, standard food-grade utilities, and clean factory environments. If your pipeline is handling aggressive chemical acids, highly concentrated salt brines, or is installed in an offshore marine environment exposed to heavy salt spray, upgrading to Grade 316L (which contains molybdenum) is recommended to prevent pinhole pitting and weld-zone intergranular corrosion.

Are Material Test Reports (MTRs) provided with these forged flanges from Kriloha?

At Kriloha Ltd., quality assurance is completely non-negotiable. Every shipment from our facility can be accompanied by comprehensive Material Test Reports (MTRs) confirming exact chemical compositions (including precise Carbon, Chromium, and Nickel content), hardness values, yield/tensile strength data, and explicit compliance with international industrial standards to guarantee complete code traceability.

This is the heading

Lorem ipsum dolor sit amet consectetur adipiscing elit dolor

Request a Quote

Enter your details here

Great! We’ve received your information.

We couldn’t process your submission. Please retry

Scroll to Top

Get a Quote

Great! We’ve received your information.

We couldn’t process your submission. Please retry