Compressor sealing system
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It’s a showdown of experts: these are the various sealing gas ports of the compressor. Take a look – what kind of gases are flowing through them? What are their functions?:)
Find the dry gas seal diagram and take a look to find out
1# is fed with the process gas from the compressor outlet, while 2# and 3# are fed with low-pressure nitrogen.
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Based on the initial count of holes, it can be inferred that the unit employs a single-end face sealing design, which is typically used in applications where the medium is relatively clean and non-toxic and harmless. Thus: 1# The process gas is drawn from the compressor outlet and undergoes treatments such as filtration and pressure reduction to remove impurities and condensate. Its pressure is higher than the pressure of the balance disk by a certain value (as specified in the sealing design parameters); this gas serves as the primary sealing gas, creating a high-pressure isolation chamber between the labyrinth seal and the main seal. This chamber helps to isolate any impurities or liquid components present in the system’s medium, thereby preventing contamination and damage to the main seal. The main sealing gas generates a dynamic pressure effect in the dynamic pressure grooves on the sealing surface, enabling the sealing friction pair to operate in a non-contact manner; a small amount of process gas leaks from the surface toward the bearing side and enters tube #2 ； #2 serves as the leakage outlet; a portion of the low-pressure nitrogen introduced through pipe #4 leaks in through the labyrinth seal inside the seal, diluting the process gas that leaks from the main seal, before being discharged to the flare line or to a higher elevation for venting ； 3# may be external starting gas introduced when the unit has not yet established a stable pressure; it could be nitrogen, with a pressure identical to that of the main sealing gas ； 4# Low-pressure isolated nitrogen (pressure is usually 20 KPa), with two leakage pathways: on one hand, it prevents sealed leaks from escaping into the surrounding environment, and on the other hand, it stops bearing oil from contaminating the seal. The above are my personal opinions for reference only. For details, please refer to the accompanying documents for the unit, sealing, and control systems.