What are the standards for internal and external leakage in double-end face seals? ? To what extent does it need repair?
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This post was last edited by Frozen Desert on 2022-9-23 08:15. The management has requested that the standards for double-end face seals be updated in the operating procedures. After taking a quick look at API682, it wasn’t possible to find out at what level of internal leakage the seal needs to be repaired, or how many drops of leakage per minute on the atmospheric side require repair.
Generally, such seals are used with hazardous media such as those that are toxic or harmful. The external seal must not allow any leakage into the environment, as such leakage can pose safety risks and requires prompt repair. In the case of a leak in the internal seal, there are usually level switches and pressure switches on the seal fluid tank to provide alerts; repair is necessary once these switches reach their set values
It depends on the process medium that leaks. Each time maintenance is required, costs are involved. Sometimes, when the amount of leakage reaches a certain level, the situation stabilizes and it becomes acceptable, eliminating the need for any maintenance
What are the standards for common shaft seal leaks? Packing seal: For light oils, less than 20 drops per minute; for heavy oils, less than 10 drops per minute. Mechanical seal: For light oils, less than 10 drops per minute; for heavy oils, less than 5 drops per minute
It should be replaced when the pressure or liquid level alarm value for leakage is reached.
Both double-end face seals come equipped with level or pressure alarms; maintenance is required once the alarm threshold is reached. Previously, there were corresponding standards for external leakage; now, from a safety and environmental perspective, any leakage is no longer permitted.
Most of the twin-machine seals we use are of the 53B type, with manual fluid top-up; fluid is added when pressure drops. Is it determined whether maintenance is needed based on how often fluid needs to be topped up? Is the interval one day? How many hours again? ?
Most of the twin-machine seals we use are of the 53B type, with manual fluid top-up; fluid is added when pressure drops. Is it determined whether maintenance is needed based on how often fluid needs to be topped up? Is the interval one day? How many hours again? ?
Model 53B is equipped with a accumulator-based pressure stabilization device that allows the medium to leak into the interior of the equipment; the specific requirements in this regard can be found in the instruction manual, or by referring to API682, which outlines the specific guidelines for leakage.
This type is equipped with a accumulator; the pressure of the sealing fluid is higher than that of the medium inside the pump chamber, and when the first seal leaks, the sealing fluid will flow into the pump body. This is relatively safe; it is possible to decide whether to replace the seal based on the frequency of fluid replacement. Assuming it is replenished a few times a month, it can be used under observation; if it needs to be replenished every few days, then considering replacing the seal is advisable.