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How to connect pigtails using flanges

Connecting a flange pigtail requires proper flange alignment, gasket installation, bolt tightening, and secure electrical splicing to ensure a leak-free and electrically reliable connection.Step 1: Inspect and Prepare Components

Before starting, check all flange surfaces, gaskets, and pigtail wires for damage or debris. Ensure the flange sealing surfaces are clean and free of foreign particles, and verify that the pigtail wires are pre-stripped and ready for connection . Select a gasket suitable for the conveyed medium and pressure, and discard any used gaskets .

Step 2: Align the Flange

Place the gasket between the flanges and align the flanges centrally to the pipe axis. For precise alignment, you can use a threaded shaft and cone adapter to center the flanges before tightening . Ensure the bolt holes are symmetrically aligned and the flange surfaces are parallel to avoid tension that could cause leaks .

Step 3: Install Bolts and Washers

Insert bolts with washers on both the head and nut sides. Select bolts of the correct type, size, and material according to the flange standard (e.g., EN 1091-1 or DIN 2572) and ensure the thread does not protrude more than 2โ€“3 threads beyond the nut . Tighten bolts gradually in a diagonal pattern to evenly compress the gasket and prevent uneven stress .

Step 4: Connect the Pigtail

For the electrical connection, splice the pigtail wires to the corresponding wires on the flange assembly. Use factory-crimped or soldered terminals if available, and ensure a low-resistance, secure connection . Twist-and-cap or crimp connectors can be used to join multiple wires safely, maintaining circuit integrity . Apply strain relief to reduce fatigue in high-vibration areas.

Step 5: Lubrication and Final Checks

Apply a suitable lubricant (e.g., molybdenum disulfide) to bolt threads and bearing surfaces to achieve proper preload and facilitate future maintenance . Verify that the flange is tension-free, aligned, and leak-proof, and that the pigtail connection is secure and insulated.

Step 6: Safety Precautions

Always release pressure from the pipeline before loosening or tightening flanges. When removing or adjusting bolts, start with those furthest from your body to avoid injury from escaping media . Ensure electrical connections are de-energized during installation. By following these steps, you can achieve a reliable, leak-free flange connection with a properly installed pigtail, ensuring both mechanical and electrical integrity.

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