Which manufacturer is good for the feed pump used in PVC polymerization with VCM monomer?
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This post was last edited by maxcsh on 2009-9-24 at 19:40. In our company’s PVC polymerization process, the mechanical seals of the monomer feeding pumps supplied by a certain manufacturer keep leaking frequently. The people from that manufacturer tried to fix the problem for over a month yet were unable to resolve it, which has caused me a lot of trouble – the mechanical seals need to be replaced frequently, which severely affects production. Our company’s management has decided to replace the monomer feeding pumps, and now they have asked me to select a manufacturer. I’m not sure which manufacturer would be the best choice; I would be very grateful if you could recommend some options.
Discuss the properties of the medium, such as viscosity, operating temperature, density, saturated vapor pressure, whether it contains solid particles, toxicity, and corrosivity. What is the required flow rate and head? What is the pump’s suction pressure, and what is the maximum suction pressure?
Discuss the properties of the medium, such as viscosity, operating temperature, density, saturated vapor pressure, whether it contains solid particles, toxicity, and corrosivity. What is the required flow rate and head? What is the pump’s suction pressure, and what is the maximum suction pressure?
The original poster, please explain what type of pump was used. If the mechanical seal leaks, it can be replaced, or certain measures can be taken; however, replacing the pump is very costly. Share the pump’s parameters so that everyone can help you.
Now shielded pumps are used, with no leaks. Previously, centrifugal pumps made of stainless steel were used; many factories in Dalian and Hangzhou can manufacture them, and you can also ask your peers for advice.
Medium: Liquid vinyl chloride monomer. Inlet and outlet temperatures: 10~25°C. Density: 0.9. Medium properties: flammable, explosive, and toxic. Inlet pressure: 0.3~0.4 MPa. Flow rate: Q=153 m3/h. Outlet pressure: 1.53 MPa. Head: H=160 m. Motor power: 160 KW
The current single-stage pump is of the centrifugal type. I can’t remember how many times the mechanical seal has been replaced; the pump manufacturer came, as did the factory that produces the mechanical seals, but the problem still wasn’t resolved. So, there’s no other choice but to replace the pump. The high cost is inevitable, as this pump is used in a critical process.
Please check whether the medium is corrosive, whether it contains solid particles, what the size of those particles is, and whether they are hard or soft
Dalian Naidé’s single-stage pumps are good; you can consult the manufacturer!
:'(Our unit is facing the same problem; as there was no other choice, we replaced it with a new pump)
It is possible to use a magnetic pump; there are no leakage points. I’m not sure if this will meet your requirements