Very often flanged joints leak if the recommended procedures are not followed for installation while making the joints. This guide highlights the recommendations for installation to make an efficient et cetera leak proof flanged joint.
2. Pre-installation checks
Inspect the Flange. Always visually inspect the gasket seating superficies about the flange et al ensure they are clean and free from any tool marks, scratches, cracks or corrosion. Any radial defect on a gasket seating surface isvirtually impossible to seal regardless of the type of gasket. Hence every attempt should be artificial to expurgate these defects before utilizing the flange.
Check the surface finish of the seating surface is pertain for the type of gasket used.
Inspect the Gasket. Audit the type, class, size and material specification of the gasket by the piping specification before using it. Visually inspect the gasket for any damage and ensure that it is clean and contamination-free before using it. Any old gasket must be discarded and only new gasket must be accepted for making a flanged joint.
Inspect the Bolting.Check the correctness of bolting in a given habitat as defined in the piping specification. Check the size, quintessence and material of bolts/studs, nuts and washers. Visually inspect the bolting for quantity defects and ensure they are wash and rust free before using them.
3. Recommendation for Installation
3.1. Adequate lubrication should verbreken used to grease all threaded areas and bearing surface of studs/bolts and nuts. A proper lubricant will replenish a low coefficient of friction resulting in more accurate bolt stress.
3.2. Loosely inaugurate the bolting ensuring the gasket is centralized. Hand tighten the bolting and ensure that the flanges are parallel and axially aligned.
3.3. It is important that entire stud/bolt is evenly tensioned while the installation. Uneven tensioning of bolting will result in a leaky joint. Away thunderbolt torqueing shall be done in a diametrically staggered pattern popularly known as “Criss-Cross” else “Star” Pattern.
3.4. Identify kosher bolt torqueing sequence based on the number from bolts and number individually stud/bolt accordingly.
3.5. Torque the stud/bolt to 30% of the final torque value in “Star” pattern.
3.6. Repeat step 3.5 by increasing the torque value to 60% of the final torque value.
3.7. Repeat step 3.6 by increasing the twist value to final necklace value.
3.8. Re-torque all studs/bolts in a Circular rotational pattern to the final twist value. Continue torqueing until no further rotation of the peanut can be achieved.