Ansi B16 5 A105 Sch40 Class150 Slip On Raised Face Steel Flange

At Kriloha Gaskets & Hardware, we recognize that modern fluid processing networks require balancing strict metallurgical compliance with structural value. Our ASME/ANSI B16.5 Class 150 Forged Carbon Steel ASTM A105 Schedule 40 Slip-On (SO) Raised Face (RF) Flanges represent our engineered answer for “High-Load-Joint-Security” and “Zero-Flexing-Integrity” across essential processing arrays. As a leading premier manufacturer and supplier of integrated flow control elements and pipeline hardware, Kriloha utilizes automated multi-axis production workflows to ensure that our forged slip-on configurations provide superior mechanical longevity compared to unpredictable cast alternatives.

The engineering of our ASTM A105 slip-on program is founded on Microstructural Uniformity and Deflection-Resistant Flatness. By forcing certified carbon steel stock through controlled hot-forging paths rather than relying on lower-cost casting alternatives, we eliminate internal gas pockets, voids, and structural micro-cracks. The refined metal grain structure smoothly traces the contour of the flange ring and low-profile hub, providing the high structural modulus required to withstand intense bolt-torque demands across the bolt circle without warping or bowing over time. The internal bore is meticulously calibrated to slide smoothly over standard Schedule 40 pipe gauges. At Kriloha, we precision-machine the Raised Face (RF) sealing surfaces on advanced CNC vertical turning lathes, adding controlled concentric phonographic micro-serrations ( finish) that firmly anchor your chosen gasket matrix to eliminate fluid bypass or blowout risks.

Manufacturing and provisioning these critical flow-control connection pieces involves strict Dimensional Tolerance Checks, Volumetric Material Inspections, and Face 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. 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

Standard Plant Process Utilities: Ideal for primary factory utility lines distributing high-pressure industrial water, cooling tower loops, factory compressed air networks, and inert gas loops.
Midstream Hydrocarbon & Petroleum Lines: Heavy-duty, economical connection joints for non-corrosive crude oil transport, gathering manifolds, storage terminal trunk lines, and fuel oil distribution networks where corrosion risks are minimal.
Steam & Condensate Networks: Reliable connection joints for secondary steam utility pipelines, boiler feed lines, and thermal fluid transport lines exposed to elevated thermal cycles.
Municipal Water & Sewage Infrastructure: High-volume provisioning for large-scale water treatment headers, municipal pump station manifolds, and wastewater filtration networks.
Modular Industrial Process Skids: Compact structural mounting flanges used to securely link prefabricated 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.

Why must the internal bore of the slip-on flange match the pipe schedule (e.g., Schedule 40)?

Unlike a weld neck flange (where the inside diameter must match the pipe exactly to prevent a lip inside the fluid stream), a slip-on flange slides over the outside diameter of the pipe. However, specifying a Schedule 40 match ensures that the flange bore maintains the precise, optimized structural clearance tolerance needed for proper double fillet welding, alignment stability, and consistent strength around that specific pipe wall configuration.

What specific welding configuration is required to install an ASTM A105 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 raised sealing face during welding.

How is this carbon steel flange protected against environmental rust during transit and storage?

Because carbon steel is vulnerable to atmospheric oxidation, our high-quality A105 flanges come standard with a protective surface treatment. This typically includes a light yellow or black anti-rust lacquer, a rust-preventative oil finish, or heavy-duty hot-dip galvanization depending on your long-term storage and field installation environment requirements.

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 (Carbon, Manganese, Silicon content), hardness values, yield/tensile strength data, and explicit compliance with international industrial standards to guarantee complete code traceability.