HOW TO INSTALL A SLIP ON FLANGE: STEP-BY-STEP GUIDE

How to Install a Slip On Flange: Step-by-Step Guide

How to Install a Slip On Flange: Step-by-Step Guide

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Slip on flanges are widely used in piping systems for their easy alignment and low-cost installation. Unlike weld neck flanges, they don’t require precise pipe cuts and are suitable for low-pressure and non-critical applications. In this guide, we’ll walk you through the step-by-step process of installing a slip on flange properly to ensure leak-proof performance and durability.



What is a Slip On Flange?


A Slip On Flange (SO flange) is a ring that is placed over the pipe end, with the flange face extending past the pipe end. It is then fillet welded on both the inside and outside for a strong connection. These flanges are easy to position and align, making them a preferred choice in many industrial piping systems.



Tools and Materials Required


Before starting the installation, ensure you have the following:





  • Slip On flange of suitable size and material




  • Pipe (clean and cut)




  • Measuring tape or scale




  • Marker




  • Welding machine (SMAW/GTAW as per requirement)




  • Grinding tool




  • Safety gear (gloves, goggles, etc.)




  • Alignment tools (optional but recommended)




Step-by-Step Installation Process


Step 1: Prepare the Pipe




  • Clean the pipe surface where the flange will be installed.




  • Use a grinder to remove any rust, oil, or burrs.




  • Ensure the pipe is cut square and smooth at the end.




Step 2: Slide the Flange onto the Pipe




  • Take the slip on flange and slide it over the pipe end.




  • The pipe end should protrude slightly (about 1/16" to 1/8") beyond the flange face to ensure proper welding.




Step 3: Mark the Welding Position




  • Use a marker to draw a reference line on the pipe where the back of the flange sits.




  • This ensures proper positioning during welding.




Step 4: Tack Weld the Flange




  • Apply 2–4 tack welds evenly spaced around the flange to hold it in place.




  • This prevents movement during the full welding process.




Step 5: Perform the Fillet Welds




  • Weld the inside circumference where the pipe meets the flange bore.




  • Then, weld the outside circumference between the pipe and the rear of the flange hub.




  • Ensure clean, smooth, and full-penetration welds to avoid leaks.




Step 6: Inspect the Welds




  • Once welding is complete, visually inspect the joints for cracks, undercutting, or porosity.




  • For critical applications, consider NDT (Non-Destructive Testing) like dye penetrant or radiographic testing.




Tips for a Successful Installation




  • Do not skip the inside weld – it is essential for sealing and strength.




  • Always use matching material electrodes for welding.




  • Follow ASME B16.5 or relevant flange standards for tolerances and installation practices.




  • Allow welds to cool naturally – avoid quenching or rapid cooling.




Conclusion


Installing a slip on flange may seem simple, but precision and proper technique are key to ensuring a long-lasting, leak-free joint. By following this step-by-step guide, you can ensure the safe and efficient installation of slip on flanges in any piping system.

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