Slip-On Flange

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Product Description

1. Product Introduction

The Slip On Flange is one of the simplest and most economical flange types, designed for straightforward field installation where the pipe end is simply inserted into the flange's boreand fillet-welded at two points: inside the bore (the ID weld) and at the face of the flange (the OD weld). This two-weld configuration provides a moderately strong joint suitable for pressures up to CL1500, though it does not achieve the full pipe-strength butt-weld of a Weld Neck Flange. The key advantages of the Slip On Flange are its lower cost, ease of alignment (the flange can be adjusted angularly before welding to correct minor misalignment), and the reduced machining required compared to Weld Neck flanges. It also requires less accurate pipe-end preparation — a square-cut pipe end is sufficient, unlike the beveled end required for butt-welding. These advantages make Slip On Flanges the preferred choice for water lines, firewater systems, cooling water, and non-critical process lines where the cost savings justify the reduced mechanical performance. The OD weld also provides a visual inspection point for joint integrity.

2. Product Features

- Sizes from 1/2" to 80" NPS — full pipeline diameter range

- Pressure ratings up to CL1500; PN10/PN16/PN40 for European projects

- Simple two-fillet-weld installation: ID weld + face weld

- Angular alignment correction possible before welding — easy field adjustment

- Square-cut pipe end sufficient — no beveling required

- RF, FF, and RTJ facing options for all standard gasket types

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