Guidelines for slurry pumping - pumpfundamentals.com

1 slurry handbookGuidelines for slurry pumpingSlurryA mixture of solids and liquid,generally water. The particlesmay not be abrasive althoughthis is of contents1. Introduction ..4 slurry pumps .. 5 Applications .. 5 slurry pump types .. 62. Flygt slurry pumps ..8 Drive unit .. 9 Hydraulic design .. 133. slurry properties ..15 slurry parameters .. 16 slurry characteristics .. 18 Liquid definitions .. 204. slurry pump systems ..21 Pump performance .. 21 Calculating with FLYPS .. 22 System design .. 23 Sizing the pump .. 25 Other considerations .. 265. Application guide ..30 Types of installation.

2 30 Application areas .. 316. Appendix ..36 Step by step calculation .. 36 Index .. 45 Designations and formulas .. 46 slurry questionnaire .. 4741. IntroductionFLYPSF lygt s pump selectionprogram is now availablewith a slurry modulewhich makes it possible tomake pump selectionbased on liquid containingsolid particles. Where are slurry pumps used? Can submersible slurry pumps replace other typesof pumps? Which parts are of special importance in asubmersible slurry pump? How can slurries be classified? Which parameters of the slurry and pipe systemare required to be able to dimension a pumpcorrectly?

3 The purpose of this book is, in a simple way, todescribe slurry pumps, slurry pumping and the variousparameters required when selecting submersible slurrypumps using provide a deeper understanding of the calculations,a manual calculation example is given in the appen-dix of the you are not sure about the type of slurry , the choiceof pump, the design of the pipe system, etc., youcan always contact your Flygt support for pumpsSlurry pumps are a heavy and robust version of cen-trifugal pumps, capable of handling tough andabrasive pumps should also be considered a genericterm, to distinguish them from other centrifugalpumps mainly intended for clear pumps are used to move mixtures of liquidand solids in many industries with a broad spectrumof applications, for example mine drainage,dredging of settling lagoons and pumping of dril-ling purpose can be.

4 To pump a medium where abrasive particlesare present To transport as much solids as possible,hydraulically To pump the end product in a processFlygt submersible pumps are used in many diffe-rent industrial segments like: Iron and steel Power generation Pulp and paper Oil and gas Waste water treatment Mining Mineral processing ConstructionChapter 5 gives a brief overview of some commonindustries and applications for slurry pump typesThree main types of pumps are used for slurrypumping: Horizontal slurry pumps Vertical slurry pumps Submersible slurry slurry pumpsThese types of pumps are often called dry mountedas the hydraulic end and the drive unit are locatedoutside the sump.

5 It is the main group of slurrypumps and they are available for a wide range ofhead and flow conditions and material types of pumps normally use standardizedelectrical motors and plants where there is a risk of flooding, there canbe reasons for replacing a horizontal pump by a dry-mounted, submersible, slurry slurry pumpsThis type of pump can be subdivided into two maingroups: Tank pumps Cantilever/sump pumpsTank pumps are considered as dry installed sump is incorporated in the pump. Open sumpand vertical inlet prevent air blocking and givesmooth operation. There are no submergedbearings or shaft seals, but quite a long shaft over-hang from lower bearing to the outletinletoutlet7 All the information thatfollows in this book, suchas technical descriptions,calculation examples, etc.

6 ,is applicable to sub-mersible slurry pumps are considered as semi-dryinstalled, as the hydraulic end is lowered into the slurry ,but the drive unit and support structure are dry to tank pumps there are no submerged bearingsor shaft seals, but a long shaft on size the pump is either mounted witha base plate over the sump or hung from the have a number of disadvantageswhich make them suitable for replacement withsubmersible pumps: Long distance between motor and volute makesthe pump bulky to handle. Limited access to the sump. Problems with sedimentbuild-up when used in sumps deeper than 2 m. Not water-proof.

7 Flooding will damage themotor. High noise submersible?Some slurry pump users may have limited knowledgeof submersible slurry pumps. It is therefore importantto advance arguments for the submersible pumps offer a number of benefits overdry and especially semi-dry mounted pumps: Operating directly in the slurry , the submersibleslurry pump requires no support structure. Ittherefore occupies less space. The motor and volute are one integrated unit,compact and easy to install. Operation underwater means low noise levels oreven silent operation. Motor cooled by surrounding liquid allows for upto 15 starts/hour, resulting in smaller and moreefficient sumps.

8 Flexible installation with several installation modes,all of which are either portable or semi-permanent. Possibility to practice Clean sump technology(see page 28).inletoutlet82. Flygt slurry pumpsThe main difference between slurry and waste waterpumps is in the parts that are in direct contact withthe slurry and thus subject to wear by the slurry ssolid factors for slurry pumps such as cooling,seals and especially the hydraulic design, aredescribed in this submersible pumpequipped with agitatorCooling jacketInspection chamberSealStrainerAgitatorMotorImpeller Stand9 Standard motordesignFlygt motordesignDrive unitMotorImportant factors for slurry pump motors.

9 Effective cooling InsulationEffective coolingWater cooling is superior to air cooling and givesthe submerged motor a high power density andcomparatively low the Flygt motor the rotor diameter is bigger andthe stator thinner than in standard motors. Thisdirects more of the losses (heat release) to the sta-tor and to the surrounding, cooling liquid. The shortheat transfer distance makes the cooling effectiveand keeps the working temperature pump can be cooled in three ways dependingon the slurry temperature and other circumstances:1. Pumps that work fully submerged in slurry , cooledby the ambient liquid. The slurry temperature maynot exceed 40 Pumps that work at times with the motor partiallyor totally un-submerged, can be equipped with acooling jacket for internal cooling, where a coolingmedium (glycol mixture) circulates (5100/5150).

10 3. Pumps that often work in a low level, in hot slurryor are dry installed can be cooled using an externalsupply of cooling liquid, connected to the ways in which the various cooling methods areused is described on page with internalcooling system10 Pump shaft andbearingsInsulationClass H insulation (180 C) is applied to the statorwinding by a trickle impregnation system. Flygtlimits the motors to Class B rise (140 ), whichreduces thermal stress resulting in extended impregnation gives a winding fill much greaterthan typical dip and bake systems. This gives muchhigher protection against short circuits in the and bearingsImportant factors for shafts and bearings: Shaft design and dimensioning Bearing type and protectionShaft design and dimensioningThe shaft and bearings are of sturdy design.