Is PO/CS or CPVC better for primary and secondary brine?
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This post was last edited by sunjl1981 on 2013-1-6 at 23:38. Nowadays, many companies use PO/CS in the saltwater purification process; it is a technology that has been well-established. However, from a technical standpoint, CPVC also presents no problems. I think that since CPVC and related plastic materials are still used relatively little, people lack confidence in their effectiveness, which is why they hesitate to use them. What do you all think? # ， ， &
I think it’s better to use CS/PO. CPVC plastic pipes are prone to leakage, require high standards during installation, and need proper pipe supports; otherwise, they are also prone to deformation.
CPVC and UPVC are available; Sichuan Honghe Chemical uses them, and it is understood that there are no issues with them.
CPVC pipes are also suitable for saltwater purification; it’s best to coat them with a layer of fiberglass on the outside to enhance their strength, which prevents deformation and makes installation easier.
Support requirements are high for CPVC pipe racks; CS/PO is better.
1. When using CPVC pipes, it is necessary to consider installing brackets; support alone is not sufficient； 2. CPVC pipes come in different thicknesses, and different specifications should be used according to various requirements ； 3. Expansion joints should be considered for use in pipeline construction ； 4. PO/CS did not perform well in brackish water; it seems to have poor alkali resistance, so it is not recommended. :(
Our company finds PTFE/CS to be effective, especially in terms of heat resistance and corrosion resistance
UPVC/FRP pipes can be used; low-calcium-magnesium UPVC pipes are recommended. It is important to provide support when using them, as well as to install expansion joints； Several units use it this way.
CS/PO should be fine; it is the CS/PO that our newly established plant design institute recommends. Last edited by limingshuguang on 2007-12-13 at 14:30.]
Could someone list the specific parameters of several materials, as well as their advantages and disadvantages? Thank you!
CPVC pipes share the same common problem as PVC pipes: they become brittle when exposed to cold. Of course, they are not exposed to high temperatures in saline solutions. In the cold winter, when the creep of pipes during the production process reaches a certain level and vibrations reach a certain intensity, it inevitably leads to pipe rupture. It is recommended not to use it in areas with large day-night temperature differences and long, cold winters. PO/CS is not very clear
Could CS be enclosed in a CPVC jacket? I just had an idea.
CS/PO should be fine; we’ll use this one
CPVC material is a good choice, but the selection should also depend on the region. Companies in the south can give priority to CPVC, while I recommend that companies in the north use PO/CS instead. Since heat retention is a problem in winter, using CPVC material combined with electric heating for insulation can easily cause the pipes to be damaged, leading to unnecessary issues and even potentially forcing a shutdown of the system. Those made of CPVC material require strict quality control before pipeline installation; otherwise, leaks are likely to occur at the joints, which are difficult to address during normal operation. It is recommended to consult relevant construction documents!
In fact, for saline pipelines, there are no requirements regarding calcium and magnesium; using steel-lined PE is sufficient. It is cheaper than CPVC, has higher strength, and there is no need to worry about leaks.
My old plant uses steel-lined PE, and the results are fairly good. I have no experience with CPVC. The new plant uses either steel-lined rubber or CPVC; I think steel-lined rubber is better as it offers greater strength； CPVC is prone to cracking at the joints; failing to consider expansion joints in the design is a major flaw. There are now many leakage points, resulting in extensive maintenance work!
Strictly control the construction quality when using PVC pipes, taking into account factors such as thermal deformation and cold brittleness; these pipes are prone to problems during startup and shutdown in winter
Our factory currently uses pipes with a steel lining covered in PE, and I think this option is better, as any leaks at the pipe joints can be sealed more tightly. If you try to tighten CPVC pipes too much, there’s a risk of damaging the flange connections
We are currently using CPVC pipes in process 150, and the results are satisfactory. As long as the contractors carry out their work carefully, find proper support points, and ensure that there are no significant vibrations during operation, it should be fine
PO is too troublesome; high saltwater temperatures can cause PO to deform, and it may lead to blockages. If possible, it’s better to use titanium