Proper flange installation helps keep the connection tight and the system working as planned. Flanges connect pipes, valves, and fittings, forming sealed joints that support the flow of liquids or gases. By following the mentioned below steps contribute to longer-lasting results.
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Check flange and pipe face condition:
Before assembly, inspect both flange and pipe faces. Surfaces must be free of dust, oil, or rust particles. Even minor damage may interfere with sealing. Clean the surfaces using suitable cloths or brushes, taking care not to scratch the contact area.
Select matching gaskets:
Gaskets fill the gap between two flanges. Pick the correct material and size based on system pressure and the medium flowing through. Gaskets must line up with the bolt holes and fit neatly into the flange faces. This supports a more uniform seal during tightening.
Align flange faces:
Align the two flange faces carefully to prevent stress on the piping system. Both should be parallel and centered. Use alignment tools or temporary bolts to hold them in place. Poor alignment may lead to leaks or damage under pressure.
Insert bolts and washers:
Place bolts through the aligned holes. Ensure all bolts are of the same grade and length. Flat washers should be added under the nut side for better load distribution. Avoid using damaged or mismatched bolts, as this may affect clamping force.
Tighten in a crisscross pattern:
Tighten the nuts in stages using a crisscross or star pattern. This method applies pressure evenly across the flange face. Start with hand tightening, then move to torque wrenches. Gradual tightening in several passes helps seat the gasket properly.
Verify torque values:
Use the recommended torque values for each bolt based on flange size and gasket type. Overtightening may damage the gasket, while under-tightening may cause leaks. Using a calibrated torque wrench provides more consistent results.
Perform pressure check:
Once the flange is installed, carry out a system pressure test if necessary. This helps detect any minor leaks or misalignments before starting full operation. If pressure loss is noted, check each bolt and gasket for alignment or defects.
