[Xi'an Yuqi High-Voltage Sealed Electrical Connector Co., Ltd.] Mechanical seal flushing solution

[Xi'an Yuqi High-Voltage Sealed Electrical Connector Co., Ltd.] The API 682 standard-for mechanical seals and sealed supply systems, has been widely used, and is also cited outside the scope of industrial applications. The authors of the new version of the API 682 standard pointed out that the new standard has never considered the scope of application outside the industry, and clarified the scope of application of the API 682 standard. These standards only apply to pump sealing systems, not mixers or compressors. Moreover, this standard applies to the oil, natural gas and (petrochemical) chemical industries, but not to the water supply or food industries.

The goals of the API 682 specification are to ensure that sealing systems can operate continuously for at least three years, improve operational reliability, and simplify maintenance processes.

1. Requirements for mechanical seals

It is generally divided into two parts: liquid sealing (the focus of this issue) and air sealing (that is, dry gas sealing, which will be summarized and then promoted to everyone later)

Liquid seals are mechanical seals specifically designed to seal liquids. In fact, the liquid film between the sealing faces is very small-equivalent to twenty millionths of an inch or half a micron. This liquid film helps isolate and lubricate the sealed end faces. When we consider the pressure, temperature and speed the seal can withstand, we understand that this is an incredible technological achievement. This will only be possible if we have high-quality liquid membranes.

2. How to become a high-quality liquid membrane?

1. Liquids must be stable and not collapse under operating conditions

2. The liquid must be a lubricant with good performance

3. The liquid must remain liquid in the sealed chamber and will not flash or evaporate

4. The liquid should be relatively clean and free from pollutants or solid particles

5. Liquid should have medium viscosity

3. Purpose of the flushing plan for mechanical seals

Injecting liquid directly into the high-pressure side of a double or single seal is called "flushing". General pumps should be flushed, especially light hydrocarbon pumps.

1. Rinse to dissipate heat. The heat generated by the liquid seal must be controlled. This can be achieved by flushing the sealed chamber with liquid to remove heat and control the temperature rise.

2. Lower the liquid temperature. In some cases, the liquid temperature is too high to affect the sealing performance. In such cases, the temperature must be reduced to improve the performance of the liquid.

3. Change the seal chamber pressure. In some cases, it is necessary to increase or decrease the seal chamber pressure to improve performance. This can be achieved by evaporating or reducing the heat load on the seal.

4. Clean process liquids. If the process liquid contains inappropriate solid particles or contaminants, the liquid in the sealed chamber needs to be cleaned. In extreme cases, it may also be necessary to provide clean liquids from outside the sealed system.

5. Control the atmospheric side of the seal. Because process liquids come into contact with the atmosphere, they may dry out, crystallize, or coke. It is important to prevent interaction with the atmosphere to avoid adversely affecting sealing performance.