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Slurry pump basic

Slurry pump basic
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Slurry Pump Basic Basic guidelines in slurry pumping Introducing the pump sizing software - Metso PumpDim™ for Windows™

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Published by Metso Minerals (Sweden) AB S-733 25 Sala, Sweden Telephone +46 224 570 00 Telefax +46 224 169 50

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SLURRY PUMPS HISTORY 1 INTRODUCTION 2 basic definitions components 5 wear protection seals 7 shaft and bearings drives 9 hydraulic performance SYSTEMS 11 BEST EFFICIENCY POINT (BEP) technical descriptions application guide sizing 16 introduction to METSO MINERALS pumpdim™ 17 Miscellaneous 18 Chemical resistance tables Private notes

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1. HISTORY Slurry Pumps – history Whilst Denver and Sala, later forming business area Pumps & Process within the Svedala Group (which in September 2001 became Metso), were both very active in Slurry Pumping, they did not originally offer their own pump designs. Both companies started as mineral process equipment manufacturers. Denver concentrating on flotation as the key product and Sala offering both flotation and magnetic separation as their major products. Following a period of success with mineral processing equipment, it soon became very obvious that there was an urgent need to become...

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Horizontal Slurry Pumps Slurry Pumping, being the foundation of all wet mineral processing, was becoming more and more important to customers of both Denver and Sala. Denver’s answer was to take on a licence for the Allis Chalmers design of the SRL (Soft Rubber Lined) Slurry Pump. The developed version of this pump was the foundation for Denver’s Slurry Pump programme for many decades and is still considered by many to be an industry standard. In 1984 Denver acquired the Orion hard metal Slurry Pump range, which, in parallel with the SRL, has been developed over the years; both designs...

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Vertical Sump and Tank Pumps As many plant floors were flooded, customers also tried to develop a pump concept able to cope with the work of keeping the plant floor clean of slurry. Accordingly, the ”sump pump” was developed. The birth of the first operational sump pump for these clean up purposes was in the mid 40’s, again designed specifically to meet a need. Both the vertical tank pump and the vertical sump pump were developed within the Boliden Mining Company throughout the 40’s. Sala was a regular supplier of these pumps to Boliden on a subcontract basis, until 1950 when Sala signed an...

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2. INTRODUCTION Hydraulic transportation of solids In all wet industrial processes ”hydraulic transportation of solids” is a technology, moving the process forward between the different stages of Solid/ Liquid mixing, Solid/ Solid separation, Solid/ Liquid separation, etc. These wet industrial processes are further described in section 15. What type of solids? Solids can be almost anything that is Hard Coarse Heavy Abrasive Crystalline Sharp Sticky Flaky Long Fibrous Frothy You name it - it can be transported hydraulically ! What type of liquids? In most applications the liquid is only...

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What are the limitations in flow? In theory there are no limits to what can be hydraulically transported. Just look at the performance of hydraulic transportation of solids in connection with the glaciers and the big rivers! In practice the limitations in flow for a Slurry Pump installation are from 1 m3/hour up to 20 000 m3/hour. The lower limit is determined by the efficiency drop for smaller pumps. The higher limit is determined by the dramatic increase of costs for large Slurry Pumps (compared with multiple pump installations). What are the limitations for solids? The limitation for the...

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3. Basic definitions Why Slurry Pumps? By definition Slurry Pumps are a heavy and robust version of a centrifugal pump, capable of handling tough and abrasive duties. ”Slurry Pump should also be considered as a generic term, to distinguish it from other centrifugal pumps mainly intended for clear liquids”. Slurry Pump – name by duty The term Slurry Pump, as stated, covers various types of heavy duty centrifugal pumps used for hydraulic transportation of solids. A more precise terminology is to use the classification of solids handled in the various pump applications. Slurry Pumps cover...

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Slurry Pump – dry or semi dry? Dry installations Most horizontal Slurry Pumps are installed dry, where the drive and bearings are kept out of the slurry and the ”wet end” is closed. The pumps are free standing, clear from surrounding liquid. The vertical Tank pump has an open sump with the pump casing mounted directly to the underside of the tank. The cantilever impeller shaft, with its bearing housing and drive mounted on the tank top, rotates the impeller inside the pump casing. The slurry is fed from the tank into the “wet end” around the shaft and is discharged horizontally from the...

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Semi dry installations A special arrangement can be used for dredging applications ,where horizontal pumps are used with the ”wet end” (and bearings) flooded. This calls for special sealing arrangements for the bearings. The sump pump has a flooded “wet end” installed at the end of a cantilever shaft (no submerged bearings) and a dry drive. Basic definitions

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Wet installations For certain Slurry Pump applications there is a need for a fully submersible pump. For example, lifting slurry from a sump with largely fluctuating free slurry levels. In this case both housing and drive are flooded requiring a special design and sealing arrangement. Slurry Pumps and wear conditions To ensure good service performance under a variety of working conditions and applications, the following guidelines are used to select pump design by classification. • Highly abrasive • Abrasive • Mildly abrasive Basic definitions

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Summary: All pumps in the Slurry Pump range are centrifugal pumps! “Slurry Pump” is a generic definition! All Slurry Pumps are in practice named after the given application: • Slurry Pumps • Gravel pumps • Dredge pumps • Sump pumps • Froth pumps • Carbon Transfer pumps • Submersible pumps There are principally three different designs: • Horizontal and vertical tank (dry installation) • Vertical sump (semi dry installation) Slurry Pump designs are selected and supplied according to the wear conditions • Highly abrasive • Abrasive • Mildly abrasive Basic definitions

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