Situation after leakage of the centrifugal pump seal

None of that will happen. The mechanical seal cooling system is an independent system, separated from the material. Unless there is a leak in the cooling system.

I would like to ask what type of fluid your pumps are used to pump, what the temperature is, and how to switch to water cooling ? ? Double-end mechanical seals are used in high-temperature, flammable, and toxic operating conditions. They typically come in series, face-to-face, or back-to-back configurations, and all of these configurations require a 52, 53, or 54 flushing system. What medium is used in your flushing system? I think what you’re describing is the mechanical 62 scheme, right?

What you said seems incorrect! I saw it – there’s material in the seal water of a pump in the workshop! The seal water outlet is a hose, and the hose is placed on the ground; it’s obvious that there is leakage!

Each specific problem should be analyzed on its own; it’s meaningless to speak in general terms. For example, in scheme 52, the pressure in the sealing chamber is lower than the pumping pressure; once the seal fails, the medium will enter the buffer. In scheme 53A, the pressure in the sealing chamber is higher than the pumping pressure; once the seal fails, the isolation fluid will enter the medium.

Is the cooling water the flushing fluid? Under normal circumstances, the pressure of the flushing fluid should be slightly higher than the pressure of the medium in the sealed chamber; unless the flushing fluid pressure is lower than the normal operating pressure, the material will not enter the flushing fluid

I’m not sure what kind of design this is. Our units also have several pumps equipped with double-end face mechanical seals, along with separate seal oil systems; it’s also possible to monitor the leakage rate of these seals. The cooling water is circulated within the seal oil tank to facilitate indirect heat removal. I’m not sure what medium this pump is used for, but in typical cooling water systems, the water does not come into direct contact with the mechanical seal. There is always some degree of leakage from the mechanical seal, and the pressure of the circulating water is not sufficient to counteract that leakage pressure. Even if the pressure were sufficient, wouldn’t the water flow directly into the pump through the mechanical seal, thereby contaminating the medium? It’s even dangerous! So I suggest you find the drawings for this device and take a close look at them. If it’s really as you say, please share them so we can study them*

You can take a look at the pump’s assembly diagram; if it’s not for two systems, please send a picture so I can learn from it.

There are generally several types of media at the mechanical seal area: the innermost one is the medium transported by the pump; outside that is the balance tube, which also contains medium. Further outside is the self-flushing system, which still uses the internal medium. The pipes transport the medium at the outlet, and in some cases it’s an external medium such as paraffin oil or diesel, which is cleaner than the main medium. All of the above are related to the interior of the mechanical seal and not to leaks. In double-face seals, kerosene or water is used between the two sealing elements; the side with higher pressure will allow leakage to occur towards the side with lower pressure. It’s possible for the medium to leak into the sealing fluid, and if the outer sealing element also leaks, then both the medium and the sealing fluid will leak outside. Further outside still, there is the back cooling system, which uses water and steam, etc.; this cooling fluid usually flows directly into the drain after passing through the seal gasket. Is there a medium inside the back coolant that the poster is seeing? ?

In other words, it comes down to who is under more pressure. In systems such as the double-end seal system of high-temperature hot oil pumps, the seal oil tank is also filled with high-pressure nitrogen for sealing purposes; if the seal is damaged, the seal oil will simply leak into the medium inside the pump ； In the double-end face sealing system of liquefied gas pumps at room temperature, the top of the seal oil tank is connected to a gas release line; when the seal is damaged, the medium inside the pump will leak into the seal oil in order to release the gas! Specifically, there are substances in the cooling water; either the mechanical seal oil line is leaking, or there is a leak somewhere else that causes those substances to enter the cooling water

This post was last edited by tybycn on 2015-10-11 23:18. What the person above said is too complicated. According to what the original poster said, it should be rinsed with double-sealed water. If the mechanical seal used to seal the material is damaged, the material will leak into the sealing chamber and into the cooling water; it will then flow out along with the wash water. This is generally referred to as internal leakage. If the mechanical seal used for sealing water is damaged, water will leak; it’s best to replace the mechanical seal. In simple terms, this means there will be external leakage