Leak-free is the eternal pursuit of chemical equipment. It is precisely this requirement that has led to the growing application of multi-stage pumps. However, there is still a long way to go for truly leak-free, such as the life of multi-stage pump isolator, pitting corrosion of materials, and reliability of static seals. Here are some basic facts about sealing:
First, the sealed form
For static seals, there are usually only two types of seals and seal rings, and the seal ring is the most widely used O-ring; multi-stage pump mechanical seal has single-end and double-end, balanced and unbalanced points. Balanced type is suitable for high pressure medium sealing (usually pressure greater than 1.0MPa). Double-side machine seal is mainly used for high temperature, easy crystallization, viscosity, containing particles and toxic and volatile medium, double seal machine seal should be sealed chamber Injecting spacer fluid, the pressure is generally higher than the medium pressure 0.07~0.1MPa.
Second, the sealing material multi-stage pump mechanical seal static and dynamic ring material configuration is more critical, not hard alloy on hard alloy on the best, the high price is on the one hand, there is no hardness difference between the two is not reasonable, so the best According to the characteristics of the media treated differently.
Multi-stage pump viscosity problems The viscosity of the medium has a great influence on the performance of the multi-stage pump. When the viscosity increases, the lift curve of the multi-stage pump decreases, the head and flow rate of the optimal working condition decrease, and the power increases. As it rises, the efficiency is reduced. The parameters on the general sample are the performance when delivering clean water, and should be converted when the viscous medium is delivered (the correction coefficient for different viscosity can be consulted for the relevant conversion chart). For high viscosity pastes, pastes, and viscous fluids, it is not recommended to use multiple pumps.
First, the sealed form
For static seals, there are usually only two types of seals and seal rings, and the seal ring is the most widely used O-ring; multi-stage pump mechanical seal has single-end and double-end, balanced and unbalanced points. Balanced type is suitable for high pressure medium sealing (usually pressure greater than 1.0MPa). Double-side machine seal is mainly used for high temperature, easy crystallization, viscosity, containing particles and toxic and volatile medium, double seal machine seal should be sealed chamber Injecting spacer fluid, the pressure is generally higher than the medium pressure 0.07~0.1MPa.
Second, the sealing material multi-stage pump mechanical seal static and dynamic ring material configuration is more critical, not hard alloy on hard alloy on the best, the high price is on the one hand, there is no hardness difference between the two is not reasonable, so the best According to the characteristics of the media treated differently.
Multi-stage pump viscosity problems The viscosity of the medium has a great influence on the performance of the multi-stage pump. When the viscosity increases, the lift curve of the multi-stage pump decreases, the head and flow rate of the optimal working condition decrease, and the power increases. As it rises, the efficiency is reduced. The parameters on the general sample are the performance when delivering clean water, and should be converted when the viscous medium is delivered (the correction coefficient for different viscosity can be consulted for the relevant conversion chart). For high viscosity pastes, pastes, and viscous fluids, it is not recommended to use multiple pumps.