I. Preparing the Pipe and Flange

Inspect the Flange and Pipe
- Ensure that the slip-on flange and pipe are free from any defects, such as cracks, rust, or debris.
- Verify that the flange matches the pipe size and material specifications.
Cut the Pipe
- Cut the pipe to the required length, ensuring a straight and clean cut to facilitate proper fitting.
- Deburr the cut edges to remove any sharp edges or burrs that could interfere with the installation.
Clean the Pipe and Flange
- Clean the pipe end and the inside of the flange to remove any oil, grease, dirt, or contaminants.
- Use a suitable cleaning agent and ensure the surfaces are dry before proceeding.

II. Fitting the Flange to the Pipe

Slide the Flange onto the Pipe
- Slide the slip-on flange onto the pipe end, ensuring it moves freely without obstruction.
- Position the flange at the correct location on the pipe, allowing for a small gap (typically around 1/16 to 1/8 inch) between the pipe end and the flange face to accommodate welding.
Align the Flange
- Align the flange properly with the mating flange or the connecting component.
- Use alignment tools or gaskets to ensure the flange is correctly positioned and centered.

III. Welding the Flange to the Pipe

Tack Welding
- Perform tack welding at multiple points around the flange to hold it in place.
- Ensure that the tack welds are evenly spaced and secure.
Perform Full Welds
- Begin with the initial weld pass (root pass) around the circumference of the pipe where it meets the flange.
- Follow with additional weld passes (filler and cap passes) to build up the weld and ensure a strong and leak-proof joint.
- Use appropriate welding techniques and filler materials based on the pipe and flange material specifications.
Inspect the Weld
- Inspect the weld visually and, if necessary, using non-destructive testing methods (e.g., radiographic or ultrasonic testing) to ensure the weld quality and integrity.

IV. Ensuring Proper Alignment

Recheck Alignment
- After welding, recheck the alignment of the flange with the mating component to ensure no movement occurred during welding.
- Make any necessary adjustments to maintain proper alignment.
Install Gaskets and Bolts
- Place the appropriate gasket between the flanges.
- Insert bolts through the flange holes and hand-tighten the nuts.

V. Tightening and Testing the Installation

Tighten Bolts Evenly
- Use a torque wrench to tighten the bolts in a cross-pattern sequence to ensure even pressure distribution.
- Follow the recommended torque values specified by the flange manufacturer.
Leak Testing
- Perform a pressure test (hydrostatic or pneumatic) to verify the integrity of the flange connection and ensure there are no leaks.
- Monitor for any signs of leakage and tighten bolts further if needed.
Final Inspection
- Conduct a final visual inspection of the installed flange and surrounding area to ensure everything is secure and properly aligned.

By following these steps, the installation of Slip-On Flanges can be performed accurately, ensuring a secure and reliable connection in piping systems. Proper preparation, alignment, welding, and testing are crucial for the long-term performance of the flange connection.

Installation Process of Slip-on Flanges