pumping brine

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An article examining the pumping of brine

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  • Brine

    Chemical

    Sodium chloride solution aka brine, Salt water or saline solution is used in many industrial processes.

    Brine used in industry is commonly produced by electrolysis to a specific concentration depending on usage. This commonly ranges from 5% as a dilute solution to approximately 25% for more concentrated applications. As water temperature rises, the quantity of salt that can be dissolved increases, however at about 26%, brine becomes saturated.

    The S.G. ranges from 1 1.15, viscosity from 1 1.6cPs.

    Applications

    Production of hydrogen, sodium hydroxide, chlorine and isolating other minerals such as magnesium and potassium

    As a food preservative, flavour enhancer and additive As a de-icer for roads For heat transfer Large refrigeration installations and cooling fluid such as in metals processing Oil and gas extraction Sea water and brackish water is also processed in desalination plants

  • Pumping considerations

    The main issue concerning any engineer specifying a pump for brine/sodium chloride solution is the choice of wet-side materials.

    For more dilute concentrations metals such as stainless steel and other alloys are acceptable, however where more concentrated solutions are being handled it is recommended a non-metallic wet-side material be specified such as ETFE.

    It is very common to specify a mag drive centrifugal pump for brine solution as the viscosity and S.G are very low

    and it is very efficient for the pumping principle and ensures containment of the fluid.

    Where high system pressures occur such as in desalination processes, a mag drive pump is a prerequisite for circulatory applications.

    The mag drive pump will circulate the brine after it has been passed through a membrane, requiring it handle huge system pressures of approximately 200 bar.

    A mag drive pump is the ideal pump for this application as there are no mechanical seals. This means that there is no danger of any seal wearing and

    Verder UK supply pumps for virtually every chemical type and application. The Verder range includes leak-free mag drive pumps, chemically inert non-metallic AODD pumps, peristaltic dosing pumps for the accurate delivery of chemical including abrasive and solid-laden types.

    Contact us for advice on specifying a pump for your brine process on 01924 221 001 or email sales@verder.co.uk

    Disclaimer: The information contained in this sheet has been researched from credible sources and should be considered as a guide only. Due to the many variables in a process, it is recommended contacting Verder for advice about your exact fluid and operating conditions.

    Below: A Verdermag mag drive pump with cast iron construction and non-metallic lining. This allows the pump pressure to be high and be chemically compatible.

    Right: Where a high system pressure occurs such as a desalination plant, more exotic alloys may need to be used. A Verdermag high pressure unit is available in Hastelloy, Duplex and Titanium construction.

    failing as the pump casing is sealed using an o-ring assembly.

    Where brine is being handled in a hygienic or 3A application, the pump must adhere to the industrial standard; models such as SS316L stainless steel double diaphragm pumps with an electro-polished surface finish on the pump body to RA