Flange Slip On Raised Face

At Kriloha Gaskets & Hardware, we recognize that modern process networks require components that seamlessly balance robust mechanical security with standardized line flexibility. Our Forged Slip-On Raised Face (SO-RF) Flanges represent our engineered answer for “High-Load-Joint-Security” and “Zero-Flexing-Integrity” across primary fluid arrays. Sourced from our advanced automated fabrication facilities, Kriloha bridges the gap between raw material science and precise international dimensional standards, ensuring that every slip-on component integrates flawlessly alongside your high-performance sealing gaskets.

The engineering of our slip-on raised face program is founded on Microstructural Uniformity and Deflection-Resistant Flatness. By forcing certified steel stock through controlled hot-forging paths rather than relying on lower-cost casting alternatives, we completely eliminate internal gas pockets, casting porosities, and structural micro-cracks. Sourcing our Carbon Steel (ASTM A105/A105N) program provides uniform hardness and exceptional mechanical toughness under cyclical line stress, while our Stainless Steel (ASTM A182 Gr. 304L/316L) program features low-carbon thresholds to prevent intergranular corrosion cracking along the weld line. At Kriloha, we precision-machine the Raised Face (RF) sealing surfaces on advanced CNC turning centers, finishing them with controlled phonographic serrations ( finish) that firmly anchor the gasket matrix to eliminate fluid bypass or blowout risks during sudden system pressure cycles.

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 (such as Schedule 40 or Schedule 80 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

Standard Plant Utilities & Process Lines: Ideal for main factory utility headers distributing industrial cooling water, low-pressure steam loops, plant compressed air arrays, cooling tower circuits, and non-corrosive gas manifolds.
Petrochemical & Refinery Piping Loops: Heavy-duty connection joints for crude oil transport manifolds, storage terminal trunk lines, hydrocarbon gathering systems, and fuel oil distribution networks.
Hygienic Process Pipelines (Stainless Steel): Clean-utility networks in pharmaceutical manufacturing, cosmetics packaging, dairy bottling plants, and food/beverage processing where non-porous stainless steel prevents fluid contamination and survives clean-in-place (CIP) chemical washdowns.
Marine Infrastructure & Offshore Utilities: High-reliability joint interfaces for seawater cooling lines, shipboard ballast systems, and coastal fuel transfer manifolds exposed to heavy environmental forces (when specified in Duplex or Grade 316L Stainless Steel).
Modular Industrial Process Skids: Compact structural mounting flanges used by prefabricated equipment manufacturers to link fluid manifolds directly to raised-face valves, strainers, inline instruments, and storage vessels.

Frequently Asked Questions (FAQs)

What is the operational purpose of the “Raised Face” (RF) on a slip-on flange?

The Raised Face (RF) serves to concentrate the massive clamping force generated when tightening the flange bolts into a smaller, centralized zone inside the bolt circle. By focusing this force onto an elevated step, the flange compresses the gasket far more intensely, resulting in a tighter, leak-resistant seal that can handle higher internal fluid pressures without blowing out.

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 specific welding configuration is required to install a Slip-On Raised Face flange?

A slip-on flange requires a standard double fillet weld setup 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 heat or weld spatter from damaging the machined sealing surface during field welding.

Can a Raised Face (RF) steel flange be safely bolted to a Flat Face (FF) Cast Iron valve?

It is highly recommended not to mate a Raised Face steel flange directly to a Flat Face cast iron component. Because cast iron is brittle, the concentrated clamping force generated by the raised face inside the bolt circle creates a bending moment that can crack or fracture the expensive cast iron valve body when torque is applied. Like-to-like face configurations are best engineering practice.

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, structural hardness values, yield/tensile strength data, heat treatment records, and explicit compliance with international industrial standards (such as ASME B16.5 or EN 1092-1 layouts) to guarantee complete code traceability.