STANDARD INSERT FLANGES TECHNICAL DATA
Roll-on Insert Flanges. The style of insert flange known as the
Roll-on is the original insert flange, and has been an industry
standard since the late 1940s. Developed many years ago as a method
of connecting pipe without welding, it is still the only commercially
available pipe flange where welding is not required. Though initially
designed for roller expansion, today many weld and appreciate
the flexibility to choose the method of fabrication.
10.2 Roller Expansion. Roller expansion is a strong, reliable and extremely cost effective method of joining insert flanges to pipe and fittings. For many years roller expanding has been successfully used by other industries in hydraulic systems, tubular heat exchangers and other industrial applications, and is recognized by the major piping and pressure vessel codes. A roller expanded joint is made by expanding a pipe into the bore of an insert flange. The insert contains grooves into which the pipe material is forced, creating a very strong and leak-tight joint. The insert expansion is accomplished with a tool containing three or more rollers in a cage on a tapered mandrel. As the mandrel is rotated, it moves longitudinally, forcing the rollers outward and expanding the pipe. Nearly all metallic materials can be roller expanded. In most cases, if the pipe has been properly expanded, the joint will be stronger than a comparable welded joint. This is because the work hardening inherent in the process increases the material strength, while welding tends to reduce the strength of the pipe material in the heat affected zone adjacent to the weld. Furthermore, applications requiring the extra low carbon grades of austenitic stainless steels for welding purposes can often utilize the straight grades, which are stronger and less costly. A roller expander and its auxiliary tools are very light and small compared to the welding equipment required to make the same attachment. Transportation is easier, and use in congested areas is facilitated. Since roller expansion uses no heat or flame, it can be safely used in explosive atmospheres where welding would be impossible.10.3 Use with Tangential Fittings. To accommodate the expansion process, tangential or long radius fittings may be required.
11.2 Setup for Expanding Operation. Start with a clean and well oiled expander. Slide the roller cage toward the small end of the tapered mandrel. After loosening the thumb screw on the adjustable collar, turn in the stop collar toward the rotating thrust collar up to the first thread on the mandrel. Tighten the thumb screw into the slot provided. Slide the bolting ring and insert over the pipe, approximately 1/32" from the end of the pipe, with the gasket face of the insert and the 45 degree chamfer of the flange toward the operator. Slide the roller cage into the end of the pipe as far as possible. (Figure 1)
11.3 Completing Expansion. Check the positioning of the rotating thrust collar by sighting vertically and horizontally so that it is parallel with the gasket face. Turn mandrel clockwise by hand until tight. Using a hand wrench, turn mandrel clockwise approximately 10 to 12 turns, or until insert is tight on pipe without any wobble. Loosen thumbscrew and turn stop collar clockwise until firm contact is made with the thrust collar. Tighten thumbscrew. This presets the adjustable stop collar so that subsequent roll-on flanges may be expanded quickly and easily with a power wrench. (Figure 2) Remove the expander. If wobble is noted, back off stop collar 1 or 2 turns and repeat tightening procedure until a leak-proof joint is achieved. Flange is now ready for assembly into the line.
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