How to protect mechanical seals

Open the accessible drain to allow drainage, preventing impurities from entering the sealing surface and causing damage to the seal.

Here are a few small suggestions: 1. It is absolutely essential to ensure the quality and pressure of the cooling water for the machine seal; this is very important. 2. Adjust the compression amount of the mechanical seal appropriately according to the medium being transported. 3. The installation requirements for the mechanical seal must be met. 4. Another measure is to strengthen inspections; if severe leakage from the mechanical seal is detected, repairs should be carried out immediately.

During the trial run, a temporary filter must be installed at the pump inlet, and it should be removed once regular feeding begins. If the conditions permit, a packing seal can be used temporarily as well.

Our experience shows that it is useful to connect a filter in parallel to the inlet pipeline; before each maintenance cycle or startup, the fluid flows through the filter pipeline first, and only after everything is functioning properly is it switched to the regular pipeline. This approach is beneficial for many devices, but it should be considered based on specific circumstances.

1. The main approach is to improve the filtration of the rinsing fluid; an additional filter can be installed on the rinsing fluid filter. 2. Check whether there is any blockage in the rinse fluid pipeline; if so, replace it promptly. 3. Pay attention to the temperature of the flushing fluid; if it is too high or the pump’s heat exchanger is too small, it is recommended to replace it with a larger one. 4. Of course, the cleanliness of the materials in the process also affects the lifespan of the mechanical seal.

1. It is best to first purge the pipes using air pressure or water pressure. 2. Adjust the tightening degree of the mechanical seal. 3. Ensure the cooling water pressure. 4. Improve the level of mechanical seal installation. 5. A filter screen is installed at the pump inlet

Before starting the pump for testing, the following checks should be carried out: 1. The rotation direction of the prime mover should meet the requirements of the pump’s rotation direction； II. All fastened connections must not be loose ； III. The specifications, quality, and quantity of the lubricating grease shall comply with the requirements specified in the equipment’s technical documents; areas that require pre-lubrication shall be pre-lubricated in accordance with the provisions of those technical documents. IV. The pipelines of auxiliary systems such as lubrication, water sealing, shaft sealing, seal flushing, cooling, heating, hydraulics, and pneumatics should be thoroughly flushed to maintain smooth flow ； V. A filter screen must be installed at the pump inlet, and its effective area should be no less than twice the cross-sectional area of the pump inlet. VI. Safety and protection devices shall be sensitive and reliable. VII. The cranking should be smooth and normal. http://bbs.hcbbs.com/thread-75959-1-207.html

Many good suggestions were made upstairs. I think that in addition to what was mentioned above, such as installing a filter on the pump inlet pipeline (which is the most cost-effective and convenient method) and replacing the packing seal (if feasible), it is also possible to change the sealing fluid used for the mechanical seal, by not using the medium being pumped as the sealing fluid. This approach may be relatively costly, as it requires an additional sealant tank to store the sealant for the mechanical seal, with inlets and outlets connecting this tank to the mechanical seal. The advantage of this method is that it ensures the cleanliness of the sealant used in the mechanical seal, and it also helps to extend the service life of the mechanical seal. There is a prerequisite: once the selected sealing fluid leaks into the medium pumped by the pump, it must not react with the medium and affect its quality or anything of the sort!

When installing, be sure to apply butter to the friction surfaces to prevent dust from causing scratches on the surfaces. When installing the rotating ring, ensure an appropriate preload; it should not be pressed too tightly against the stationary ring – generally, a compression of 2–3 millimeters is sufficient. Choose the appropriate seal type based on the operating conditions