[Purification Weekly Topic] June 12-19, 2011: The role of nitrogen in the mechanical seal of methanol washing cooling pumps
Thread Content
What is the role of nitrogen in the mechanical seal of Linde cryogenic methanol wash cold pumps? Note: 1. Participants who are willing to offer rewards of varying degrees are encouraged to speak up. 2 In accordance with the forum rules, please do not use hidden replies; otherwise, no score will be given. -
Is that the case? Here, at most we add an additional siphon tank; I think it still has something to do with the selection of the pump’s seal
We designed this thing on the pump here, but it has actually never been used. The main function of this nitrogen line is to prevent the backup pump from freezing to the shaft and locking it in place.
Due to the low temperature of the medium, nitrogen can prevent freezing at the tail of the static ring.
When the pump is in standby mode, nitrogen is pumped in; this serves to heat the bearing area and prevent it from freezing, which could damage the bearings. The expert replied next.
Ours is the same as yours; it seems to have no effect in actual use!
Reply to 5# Nine-Tailed Fox: Since it has been designed, it must have a purpose. Its function is to prevent ice formation (frost) when humidity is high and temperatures drop; nitrogen is used to blow away this ice so that it doesn’t freeze on the shafts – it’s not meant for other uses.
According to the specifications in API610, the sealing type for cryopumps should be Plan11+52+62, where Plan62 refers to the nitrogen quench line. Its main function is to prevent the casing of the standby pump from freezing at the pump shaft and seal area, thereby avoiding damage to the seal when the pump starts up. If the standby pump can defrost regularly during normal operation, this pipeline can be omitted. In the projects carried out by my company, there is such a nitrogen connection on the pump, but it isn’t connected during on-site piping work. It is working well at the moment.
The brother upstairs is absolutely right. According to API 610, \"Centrifugal Pumps for the Petroleum, Petrochemical, and Natural Gas Industries,\" this is one of the sealing methods used for such pumps. The configuration 11+52+62 is employed to reheat the mechanical seal, especially in low-temperature pumps. Since the temperature inside the pump chamber is much lower than the ambient temperature, water vapor near the side of the mechanical seal that faces the atmosphere tends to condense and freeze. Freezing of the mechanical seal increases its hardness, which can damage both the mechanical seal itself and the shaft. Therefore, it is necessary to reheat the seal in order to protect it! On our end, it’s optional as well; the pipes are available, but I personally think it should be used!
With a low medium temperature, it easily absorbs water vapor from the environment and freezes; N2 isolates air to prevent freezing and damage to the sealed end faces. It’s equivalent to hot air protection!
It’s used to prevent freezing. In our factory, there were instances where freezing caused the machinery to stop moving; that’s why we installed this pipeline, and since then such problems have not occurred again