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Centrifugal pumps, diaphragm pumps, positive displacement pumps and turbo pumps are the most commonly used pumps in the chemical industry. ... temperature and pressure, corrosion tendency, corrosion tendency and solids in the slurry.
Centrifugal Process Pumps For Chemical Solvent Plants. The chemical industry has a huge demand for pumps that provide efficiency of work, as well as provide protection to employees working in the industry. A chemical manufacturing company has to handle aggressive acids which are toxic, prone to corrosion and flammable.
Centrifugal pump is the most common pump used to transfer liquid in chemical industries. Centrifugal pump work on the principle of Bernoullis Law. The liquid that leaves the outer diameter of impeller enters into the internal casing wall of volume. Here it stops to collect in ever expanding exit chamber of volume.
Pumping of slurries can often lead to blockages or equipment failure. The job of the designer is to assess all the factors of each situation, including client and existing site preferences to design a system and select a pump which is robust enough to minimise blockages and makes maintenance for operators as easy as capital would permit whilst providing a safe system of work.
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What is a slurry? Typically, the term slurry is used to refer to a mixture of a liquid and a solid or combination of solids. The liquid is often referred to as the carrier fluid and in most cases is water, although it can be anything from an acid solution to a hydrocarbon . Producing a slurry or maintaining solid suspension in static conditions is outside the scope of this article. Slurries can broadly be broken down into two types: settling, and non settling slurries. This characterisation is based on the nature of the solid. Non settling slurries contain solids made up of fine particles, which largely remain in suspension when the applied mixing energy ceases. Settling slurries, as the name suggests, contain solids whose particles settle out when the applied mixing energy ceases. From a designers perspective, it is important to know the type of slurry. For example, non settling slurries can be transported around under laminar flow conditions, wherea...
As with many pump duties, both rotary and positive displacement pumps can be utilised. The following are some of the aspects to consider when selecting the type of pump for your slurry. However, always check with specialist pump suppliers before making a final decision.
Selecting a suitable pump for a slurry application can be a tricky business. There are many variables to consider, some of which have been mentioned in this article. The overriding messagethough is to ensure that the solids remain in suspension and to minimise wear and blockages. The above is provided for discussion and general guidance purposes only. For specific cases, you should gather as much information as possible on the carrier fluid and solids, and discuss options with a relevant pump vendor.
1. Sinnot, R and Towler, G, Chemical Engineering Design, Fifth Edition, Elsevier, 2009. 2. Processing of Solid Liquid Suspension, ed Ayazi Shamlou, P,Chapter 11 by Shook, CA, Chapter 12 Etchells, AW, Butterworth Heinemann, 1993. 3. Green, DW and Perry, RH, Perrys Chemical Engineers Handbook, Chapter 6, 8th Edition, McGraw Hill, 2007. 4. Slurry Pumping Handbook, International, Feb 2000. 5. https://bit.ly/2Ud76ls 6. Coulson, JM, Richardson, JF, Backhurst, JR, Harker, JH, Coulson and Richardsons Chemical Engineering Volume 1 Fluid Flow, Heat Transfer and Mass Transfer, 6th Edition, Elsevier, 1999. 7. Jones, GM, Pumping Station Design,revised 3rd edition), Elsevier, 2008.