The gas flow rate at the second stage of the dry gas seal has increased
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What does an increased secondary air intake flow in the dry gas seal indicate? Why is it necessary to set up a high-high alarm interlock!
Generally, dry gas seals do not have very high flow rates. If the flow rate reaches the alarm level and the pipeline temperature is much higher than normal, it can be assumed that the dry gas seal is damaged.
Generally, dry gas seals do not have very high flow rates
If the flow rate of air at the second stage is high, it must be that the secondary seal is damaged. It is possible to monitor changes at the secondary exhaust outlet, and at the same time observe the changes in flow rate and pressure of the leakage gas at the primary stage; these values should also increase somewhat.
It’s likely there’s a problem with the dry gas seal; whenever a planned shutdown occurs, it needs to be removed for inspection – the sealing surface must be worn out
The flow rate of the sealing gas is an important parameter for determining whether the dry gas seal is functioning properly. In a normal operating condition, the thickness of the rigid gas film between the stationary and rotating rings of the dry gas seal is approximately 3 μm; therefore, the flow rate remains constant. If this flow rate is too high, it indicates that the seal may have failed.
The leakage rate of the dry gas seal in my unit is 10 Nm3/h; it is reported as 12 Nm3/h. Should it be replaced?
This post was last edited by jyszyx on 2009-5-15 09:55. Once the dry gas seal is operating smoothly, it is theoretically not subject to wear; only the O-ring may age. Avoiding frequent shutdowns will help ensure its lifespan. If the flow rate increases, it is usually due to aging of the O-ring, which needs to be replaced. A high alarm is set because when the flow rate increases, the pressure inside the sealing chamber drops, resulting in friction at the sealing surfaces. I’m new here; please give me some guidance!
"The inlet flow rate at the second stage of the dry gas seal has increased – there’s a problem with the buffer gas! The flow rate through the buffer has gone up. A high-level alarm is set for the dry gas seal in order to prevent excessive inlet flow from affecting the opening of the end face; in fact, too much inlet flow can have a negative impact on the end face. Please correct any errors in my analysis
The flow rate of the buffer gas has increased, right? Which manufacturer’s seal are you using? Also, what is the level of sealing for yours? What are the readings for the buffer gas, isolation gas, and sealing gas in the sealing control system? If there is flaring for venting, has the pressure difference in the balance tube increased? You’ve only provided a little information so far; it’s difficult to determine anything based on that
How many stages of sealing does a dry gas seal have? What are they from the inside out, what are their names, and what is their function?
How many stages of sealing does a dry gas seal have? What are they from the inside out, what are their names, and what is their function?