Discussion on shielded pumps for transporting high-purity tetrachlorosilane (silicon tetrachloride)
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Hello, dear colleagues in the marine industry. Recently, I came across a project involving high-purity silicon tetrachloride, and regarding the shielded pumps used for transporting this substance, I have the following questions I would like to discuss and seek advice on: 1. Silicon tetrachloride reacts violently when it comes into contact with water, and high-purity products require extremely high standards of equipment cleanliness. When testing a canned motor pump at the manufacturer’s facility, should pressure testing be done using air pressure or water pressure? If it is a hydrostatic pressure test, how should it be cleaned and dried? 2. After the tests are completed in the factory, is it necessary to clean or dry it again on-site? Is it necessary to soak it in CCl4? 3. Regarding the material used for shielded pumps, is 316L or 316Ti commonly used? For low-purity silicon tetrachloride, is carbon steel suitable? 4. Regarding the monitoring and protection instruments for shielded pumps, what other conditions need to be monitored in addition to bearing wear? Liquid level? Shielding jacket temperature? Motor stator temperature? 5. Recommend several manufacturers of silicon tetrachloride shielded pumps. 6. Could everyone please share some information and drawings of manufacturers related to silicon tetrachloride shielded pumps? Thank you. Thank you!
The shielded pumps produced by Dalian Haimitek are quite good
Is the original poster working on a high-purity STC project? You can talk to me. I also work with high-purity STC. I’m not very familiar with equipment, so I’m not entirely sure about the cleaning of pumps either; I can only discuss it from a process perspective. Shielded pumps have excellent sealing properties; STC always chooses shielded pumps for its applications. High-purity STC shielded pumps are made of SUS304, while those with lower purity require carbon steel to suffice. For shielded pumps, the ones from Dalian Empire are quite good. The designs seem to be similar; the only differences lie in the flow rate, head, and inlet/outlet dimensions depending on your pump’s requirements.
It’s too expensive, but the quality is indeed good
Money knows quality! Good products give you peace of mind when using them
1. When testing shielded pumps at the manufacturer’s facility, hydraulic pressure tests are generally carried out; in such cases, nitrogen is used for drying. 2. After the tests are completed in the factory, drying with nitrogen is required again before the pump is installed on-site. 3. As for the material used for shielded pumps, 316L is commonly used; for low-purity silicon tetrachloride, carbon steel can also be used. 4. Regarding the monitoring and protection instruments for shielded pumps, apart from bearing wear, the most common problems involve the front and rear shaft sleeves, and vibration can indicate these issues
Thank you, it seems you’re an experienced expert. . .
Hemitec works quite well. Just specify the medium you need, and they’ll take care of it for you
The Kaimipu shielded pumps produced in Zhangjiagang offer excellent quality and service.
Previously, Dalian Haimi and Empire pumps were used; later, that company started using imported Empire pumps, with some of them made from 304 material and others from 316L material
The Hammett pumps are of higher quality but more expensive; the Dalian Empire pumps are somewhat rougher in construction, especially the threads on multi-stage pumps which need to be treated, though they are still usable for practical purposes