M481 Mechanical Seal Installation Precautions

1. General Safety Requirements

* Do not touch the seal faces with bare hands or any contaminated objects.
* Always wear clean gloves during installation to avoid contamination.
* Keep the installation area clean, dry, and free from dust and metal particles.
* Ensure the seal model (M481), size, and materials are fully compatible with the working fluid.

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2. Pre-Installation Inspection

* Check shaft or sleeve surface for scratches, corrosion, or wear.
* Ensure shaft runout and alignment are within allowable limits.
* Verify that the seal chamber and gland plate are clean and undamaged.
* Confirm all seal components are complete and undistorted.

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3. Shaft and Equipment Requirements

* Shaft surface must be smooth, clean, and properly chamfered.
* Remove all burrs and sharp edges before installation.
* Ensure proper concentricity between shaft and seal chamber.
* Do not install the seal on a worn or undersized shaft surface.

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4. Handling of Seal Faces

* Seal faces are precision-lapped components and must not be scratched.
* Avoid dropping or impacting any seal parts.
* Do not place seal faces directly on hard surfaces.

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5. Lubrication Requirements

* Lightly lubricate O-rings with compatible lubricant before assembly.
* Use clean water, glycol, or approved grease depending on elastomer material.
* Do not use petroleum-based lubricants unless specified by manufacturer.

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6. Installation Precautions

* Install stationary and rotating components in correct orientation.
* Ensure correct spring compression according to installation dimension.
* Tighten gland bolts evenly in a crisscross pattern to avoid distortion.
* Do not over-tighten set screws or gland bolts.

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7. Alignment and Assembly Control

* Maintain proper shaft alignment before final tightening.
* Ensure uniform contact between seal faces after assembly.
* Check that the rotating unit moves freely without binding.

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8. Pre-Start Checklist

* Rotate shaft manually before starting the pump to ensure smooth operation.
* Confirm that no dry-running condition exists.
* Fill the seal chamber with process fluid and remove all air.
* Verify that all installation tools, clips, and locking devices are removed.

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9. Operation Warning

* Dry running is strictly prohibited even for a few seconds.
* Monitor initial operation for leakage, vibration, and temperature rise.
* Stop the pump immediately if abnormal noise or leakage occurs.