Mechanical Seal Inspection and Installation Procedure Mechanical Seals

Mechanical Seal Inspection and Installation Procedures




2021-07-09 10:56






Check: Whether the dimensional accuracy, geometric accuracy and mutual relationship of the relevant parts of the mechanical seal are in compliance with the requirements.

1. The dimensions, surface roughness and chamfer transition style of the shaft and static ring seat matched with the mechanical seal are shown in the figure below;

2. The radial runout of the shaft should be≤0.04mm, axial movement≤0.3mm;

3. Perpendicularity between the sealing cavity and the gland connecting the positioning end to the shaft centerline≤0.04mm;

4. Check whether the axial and radial dimensions of the sealing chamber and gland assembly are correct.

Mechanical seal installation:

1. The assembly size must be guaranteed according to the requirements;

2. During the whole installation process, keep the mechanical seal and the sealing chamber of the equipment clean, and strictly prohibit bumping and knocking to avoid deformation and damage of the friction pair of the mechanical seal and seal failure;

3. The sealing part can be coated with a layer of clean lubricating fluid for smooth installation. Ethylene-propylene rubber is recommended to use soapy water or silicon ester;

4. When installing the static ring gland, the tightening bolts must be evenly stressed to ensure that the end face of the static ring is perpendicular to the center line of the end cover, and note that the anti-rotation groove on the back of the static ring should be aligned with the anti-rotation pin, but it cannot be in conflict;

5. When installing seals related to the direction of rotation (such as parallel coil spring drive and hook spring drive), attention should be paid to whether the direction of rotation of the spring is correct, and the more the spring is turned, the tighter it is;

6. Install the part of the torsion ring. When the retaining ring or impeller or spring seat is used to fix the shaft, the working length of the part of the torsion ring must be ensured. After installation, the torsion ring should be compressed by hand to make the torsion ring move flexibly in the axial direction Can restore the bit;

7. After installation, turn the rotating shaft by hand to check whether there is a sense of weight. If so, check whether the installation is correct.