Corrosion resistance poses special requirements in the extraction of bromine
Extracting and refining bromine is among the top corrosive processes in chemical industries. Even the source material, sea water or brine and the waster waters produced require components from special-ized corrosion resistant materials. As material flows are large in this industry, the question is what kind of pumps are suitable?
Everything is based on safe components
Salt is not just important for a good soup. Elements such as chlorine, potassium and bromine are fundamental for a large number of fine chemical processes to work and thus for a vast amount of products every one of us uses every day. Beside the continuous corrosive stress bromine plants must also focus intensely on safety for people and the environment. Requirements that also apply to pumps.
Production plants in the bromine field utilize equipment made of glass or enamel that has proven most reliable. So have non-metallic plastic pumps. In this application extreme requirements regarding tightness can only be achieved through special knowledge in equipment manufacturing and pump technology.
While small plastic pumps for dosing are common and accepted in many industries this is not always the case when it comes to large flows. Even if ‘salty water’ doesn’t sound too much of a challenge, it really is in terms of corrosion and erosion resistance. Stainless steel grades with high pitting resistance coefficients (PRE) are required and sometimes even nickel-based alloys. Especially under changing operating conditions if chlorine, chlorides or fluorides occur, metal turns out to be less tolerant.
No more surprises
You guessed it – plastic pumps can do better. There are no surprises, no corrosion. And even better: They often provide better erosion resistance compared to most metal alloys. And if you only knew plastic pumps from small dosing applications you might even be amazed to hear that today’s plastic pumps are available in almost as many sizes and seal variants as metal pumps.
MUNSCH centrifugal pumps comply with actual standards such as ISO 2858 and can be used in explosive environments. A selection of only five basic plastic materials covers almost the entire range of industrial ap-plications and provides a flexibility as well as availability nowhere seen in the metal sector.
Important in applications where permeation is an issue such as in chlorine and bromine industries is to install pumps from thick solid materials.
Have talks with you pump supplier
An important aspect when selecting a suitable pump solution for your application is the shaft seal. There is no good or bad here. Availability and flexibility and budget often point to a certain direction but even more im-portant is a thorough clarification between engineering, operators and pump suppliers. Understanding the needs, ideas, restrictions and possibilities of one another often leads to much better and way more cost effec-tive installations!
Source & Pictures: MUNSCH Chemical Pumps