6 Inch Rf So Flange Ansi-B16.5 Stainless Steel Slip On Pn16 Pipe Flange

6 Inch Rf So Flange Ansi-B16.5 Stainless Steel Slip On Pn16 Pipe Flange

6-Inch Raised Face (RF) Slip-On Flange (ANSI B16.5 / PN16 Cross-Compliant)

Category: Flanges | Sub-Category: Slip-On Flange / Hubbed Plate Family

Core Features

  • 6-Inch Nominal Standard Sizing (NPS 6 / DN150): Precision-machined with a center clearance internal bore engineered to slide seamlessly over standard 6-inch nominal outer diameter (168.3 mm) stainless steel pipelines, distribution headers, or pump discharge arrays.
  • Dual Engineering Standard Layout (ANSI & PN16): Precision-machined to cross-align with both American ASME/ANSI B16.5 (Class 150) and European metric PN16 (DIN / EN 1092-1 Type 01/12) dimensions. This specialized multi-drilled or calibrated pattern ensures absolute bolt-circle and pitch circle diameter (PCD) interchangeability on global fluid lines.
  • Premium Forged Stainless Steel Core: Hot-forged from premium austenitic stainless steel stock (typically available in low-carbon 304L or 316L grades). Sourcing a forged core ensures maximum structural yield, eliminating the risk of hidden casting porosities or micro-cracks under system tension.
  • Low-Profile Slip-On (SO) Hub Profile: Features a low-profile raised hub or collar surrounding the center bore. This architecture distributes mechanical line strain and thermal expansion loops far more effectively than a standard hubless plate ring.
  • Double Fillet Weld Joint Security: Attached via a robust double fillet weld matrix—one external weld tracking the hub neck and one internal weld along the inside bore face where the pipe sits slightly stepped back—forming a highly stable, leak-proof mechanical joint.
  • Precision CNC Raised Face (RF) Sealing: The elevated mating face concentrates bolt-clamping forces onto a targeted zone. Finished with standardized micro-grooved phonographic or concentric serrations ( finish) to ensure maximum gasket mechanical friction and prevent fluid blowout.

At Kriloha Gaskets & Hardware, we recognize that mid-to-large bore process networks require components that seamlessly balance robust mechanical security with standardized line flexibility. Our 6-Inch Raised Face (RF) Stainless Steel Forged Slip-On (SO) Flanges represent our engineered answer for “High-Load-Joint-Security” and “Zero-Flexing-Integrity” across essential processing 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 6-inch stainless slip-on 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 low-carbon “L-Grade” chemistry (such as 304L or 316L) prevents intergranular corrosion cracking along the weld line during installation. 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 8-bolt circle without warping or undergoing structural relaxation over time. 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.

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 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 stainless metallurgy and micro-tolerance engineering.

Primary Industrial Applications

  • Hygienic Process Pipelines: Clean-utility networks in food processing, large-scale breweries, dairy plants, and pharmaceuticals where smooth, non-porous stainless steel prevents fluid contamination and survives clean-in-place (CIP) steam washdowns.
  • Moderate-Pressure Plant Utilities: Ideal for main factory utility headers distributing industrial water, low-pressure steam, compressed air loop arrays, cooling tower circuits, and non-corrosive gas piping operating under Class 150 or PN16 parameters.
  • 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.
  • Marine Infrastructure & Desalination: Critical, lifetime rust-resistant joints for seawater cooling networks, reverse osmosis water purification blocks, and coastal fuel manifolds exposed to heavy salt spray (when specified in Grade 316L).
  • Modular Industrial Process Skids: Compact structural mounting flanges used by equipment manufacturers to link prefabricated mid-diameter piping manifolds directly to raised-face valves, strainers, inline instruments, 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 configurations for a 6-inch Class 150 / PN16 Raised Face flange?

According to both the ASME B16.5 Class 150 and EN 1092-1 PN16 standards for a 6-inch (DN150) flange, the configuration features 8 bolt holes. For the ANSI pattern, it utilizes a 9.50-inch (241.3 mm) bolt circle diameter to accommodate 3/4-inch bolt sizes. The cross-compliant layout ensures these dimensions align cleanly for simple installation across international plant systems.

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

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

Grade 304L is highly economical and excellent for freshwater processing, commercial HVAC loops, 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 mandatory to prevent localized pinhole pitting.

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, Nickel, and Molybdenum content where applicable), hardness values, yield/tensile strength data, and explicit compliance with international industrial standards to guarantee complete industrial traceability.

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