Dry gas seal issues~~a persistent problem

If the pressure difference decreases, the booster pump will definitely need to operate

The pressure in the balance tube is slightly higher than the inlet pressure!

First, the working medium of your device should be a special gas, and then dry inert gas nitrogen is used as the sealing gas. The equilibrium gas here should be the production gas. The process should be such that the gas in the high-pressure section leaks in small amounts through the comb-shaped seal (dynamic seal) into the compressor inlet, creating a pressure difference on the balance disk and thus generating an axial force that is necessary for balancing the rotor. Then there is the dynamic seal for the balanced gas at the connections between the ends of the rotor and the volute, as well as a point with a pressure higher than atmospheric pressure. To prevent leakage, a system is installed in which an inlet seal creates a sealing chamber containing gas at a pressure slightly lower than that of the leaking gas; a certain amount of this gas is then released into the atmosphere, thereby ensuring that the process gas remains isolated from contact with the bearing housing. This produced gas could be “high-purity oxygen”. It is recommended to search for images on Baidu related to this topic; there are schematic diagrams that can provide clarification.

It seems there’s an issue with your parameter settings; as a result, the booster pump will run continuously, which can damage the pump even though it’s not necessary. Please check again to see if the pressure after decompression in the dry gas seal has been set too low

I also think it’s too low, and the chain value is incorrect as well; but the values provided by the manufacturer are all these

Manufacturers can make mistakes too; one should neither completely trust nor disregard their data. There are issues with the numbers and logic in this design

Find the location of the pressure-taking point and the location of the pressure pump

The pressure at the pressure tapping point of the balance tube should be the compressor outlet pressure. The pressure difference between the outlet pressure and the pressure of the first-stage seal is much greater than 0.05. If this pressure difference cannot be established, there could be several reasons: 1. Instrumentation issues; 2. Freezing in the pressure tapping tubes of the balance tube, which results in no pressure being generated. 3. A leak in the seal prevents a pressure difference from being established. 4. It’s definitely not possible to keep the booster pump running continuously; such devices have a limited number of operational cycles – each use reduces their capacity. It’s necessary to find out as soon as possible why a sufficient pressure difference cannot be established

There should also be a control valve between the balance tube and the seal pressure difference; check what its opening degree is. Under normal circumstances, it should be set to automatic mode to keep the pressure difference within a certain range. Check whether there is a problem with the control valve. The booster pump is primarily used to inject air into the sealing surface; once this pump reaches the end of its service life and stops working, the dry gas seal will inevitably be damaged.