• High-Pressure Hydrocarbon & Refinery Piping: Reliable connection joints for downstream processing loops, crude oil transport headers, and heavy fuel distribution manifolds operating under Class 300 or Class 600 parameters.
• Heavy-Duty Utility Steam & Boiler Feeds: Robust flanged connections for primary high-pressure steam distribution headers, boiler mainlines, and thermal fluid condensate lines.
• High-Head Pump & Compressor Manifolds: Heavy-duty, space-saving connection interfaces designed to withstand severe mechanical vibration and fluid pulsations from large-scale industrial pumps and compressors.
• Municipal Water & Waste Utilities: Standard space-saving connection joints for large-scale water treatment headers, heavy sewage drainage networks, and high-volume municipal pumping manifolds.
• Modular Heavy-Duty Process Skids: Compact structural mounting flanges used to securely link prefabricated heavy-wall manifolds directly to valves, strainers, and high-pressure storage vessels.

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

While both flange types slide over the outer diameter of the pipe, 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 higher mechanical loads, vibrations, or heavy thermal expansion cycles.

When should I select an RTJ face profile over an RF profile for a 12-inch flange?

A Raised Face (RF) profile is ideal for low-to-medium pressure applications (Class 150 and Class 300) using composition or elastomeric gaskets. A Ring Type Joint (RTJ) profile features a deep, precision-machined V-groove designed to crush a solid metallic ring gasket under high bolt torque. RTJ configurations are highly recommended for high-pressure, high-temperature, or critical-service pipelines running under Class 600 parameters where an absolute metal-to-metal seal is required.

What specific welding configuration is required to install an ASME B16.5 Slip-On flange?

A slip-on flange requires a standard double fillet weld setup for a 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 protect the sealing surface from weld spatter during field welding.

Why is the Schedule 80 designation critical when ordering a 12-inch slip-on flange?

The “Schedule” dictates the wall thickness of the pipe. A 12-inch Schedule 80 pipe has a significantly thicker wall (and therefore a smaller inner diameter) than a standard Schedule 40 pipe, though the outer diameter remains the same. Ordering a slip-on flange specified for Schedule 80 ensures that the internal bore and hub clearance are properly proportioned to slide onto the pipe while perfectly matching its structural characteristics at the weld zone.

Are Material Test Reports (MTRs) provided by Kriloha for Class 300 and Class 600 components?

At Kriloha Ltd., quality assurance is completely non-negotiable. Every high-pressure, heavy-duty shipment from our warehouse is accompanied by comprehensive Material Test Reports (MTRs) confirming exact chemical compositions, hardness values, yield/tensile strength data, and explicit compliance with international industrial standards (ASME B16.5 / EN 1092-1) to guarantee complete industrial traceability.