6 Inch Stainless Steel Slip On Flange Pn16

6 Inch Stainless Steel Slip On Flange Pn16

6-Inch / DN150 Forged Stainless Steel Slip-On Flange (PN16 Pressure Execution)

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

Core Features

  • 6-Inch Nominal Metric 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 lines.
  • Metric Pressure Rating Compliance (PN16): Precision-engineered to conform strictly to European DIN / EN 1092-1 (Type 01 or Type 12) dimensional templates for 16-bar pressure execution. This guarantees perfect alignment, bolt-circle layouts, and pitch circle diameter (PCD) interchangeability across international utility lines.
  • Premium Low-Carbon Stainless Steel Core: Forged from high-grade austenitic stainless steel stock (typically available in Grade 304L or 316L). Sourcing an “L-Grade” low-carbon threshold eliminates carbide precipitation during field welding, preserving maximum corrosion resistance across the heat-affected zone (HAZ) without the need for post-weld heat treatment.
  • Low-Profile Slip-On (SO) Hub Profile: Features an integrated, low-profile raised hub or collar surrounding the center bore. This architecture distributes mechanical line strains, pipe-weight loads, and thermal expansion loops far more effectively than a standard hubless plate ring.
  • Double Fillet Weld Joint Security: Attached to the pipeline by sliding directly over the outer diameter of the 6-inch pipe. The joint is permanently secured via a robust double fillet weld matrix—one external weld tracking the perimeter of the hub neck and a secondary weld inside the bore.

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 (DN150) Forged Stainless Steel Slip-On Raised Face (SO-RF) PN16 Flanges represent our engineered answer for “High-Load-Joint-Security” and “Zero-Flexing-Integrity” across essential processing arrays. As a premier manufacturer and supplier of integrated flow control interfaces and high-performance pipeline hardware, Kriloha utilizes automated multi-axis production workflows to ensure that our forged configurations provide superior mechanical longevity compared to unpredictable cast alternatives.

The engineering of our metric slip-on program is founded on Microstructural Uniformity and Deflection-Resistant Flatness. By forcing certified Grade 304L or 316L stainless 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. The internal metal grain structure smoothly traces the contour of the flange ring and low-profile hub, providing the component with an exceptional structural modulus. This allows it to withstand high bolt-torque demands across the metric 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 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 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 industrial breweries, dairy plants, and pharmaceuticals where smooth, non-porous stainless steel prevents fluid contamination and survives clean-in-place (CIP) steam washdowns.
  • 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, shipboard ballast loops, and coastal fuel manifolds exposed to heavy chloride environments (when specified in Grade 316L).
  • Moderate-Pressure Plant Utilities: Ideal for main factory utility headers distributing industrial water, low-pressure steam, compressed air networks, and cooling tower loops operating under PN16 parameters.
  • 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 are the standardized bolt hole configurations for a PN16 DN150 / 6-inch flange?

According to the modern EN 1092-1 / DIN dimensional standard for a PN16 pressure rating, a DN150 (6-inch equivalent) flange features an outer diameter of 285 mm and a pitch circle diameter (PCD) of 240 mm. It utilizes 8 bolt holes designed to accommodate M20 size bolts.

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 metric 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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