Agitator is one of the important parts in the mixing process. Gear design in mdesign gearbox march 2012 driveconcepts gmbh, dresden tutorial for gear design and calculation with mdesign gearbox dipl. By using the formula you gave on a precedent topic may 31, 2011, i estimated the reynolds 1. As per the design calculation existing agitator gb is designed for max. The filter screen shall be from aisi 304 fine wire mesh. A machine properly aligned will be a reliable asset to the plant, it will be there when it is needed and will require less scheduled and unscheduled maintenance. Our core business was and is the technical design and production. Energy utilization in different types of agitators design calculations the mixer shaft is located off center onefourth to onehalf the tank radius, the resulting. On internet i found articles for power consumption calculation for agitator with one impeller only. In this paper, agitator shaft design modification carried out for selection of another material, motor selection, mounting of agitator, no. Shaft design calculation pdf and generated in shaft and bearing calculations. Design and implementation of differential agitators to maximize agitating performance saeed asiri king abdulaziz university, 21589, jeddah, p. Compare combined stresses to suitable allowable stresses. Shaft design objectives compute forces acting on shafts from gears, pulleys, and sprockets.
Characteristic of application requiring minimum fluid velocities to produce a flat but moving fluid batch surface. The first shaft is the bearing axis while the second shaft is the axis of the quartet. Recent articles have focused on the advantages that various impeller con. Proper and uniform mixing gives improved quality of the product. I wanted to calculate power consumption of agitator having 3 impellers installed on a single shaft and running at same speed. Oct 06, 2018 agitator shaft design calculation filetype pdf download. To design the agitators, there is a need to calculate the. Find bending moments from gears, pulleys, or sprockets that are transmitting loads to or from other devices. Paddle mixer design, phosphate fertilizer, autodesk inventor, fem. Agitation and mixing of fluids purpose of agitation. Contra rotating mixer impellers for viscous blending duty series 5500 improved side entry agitators for paper and pulp applications glass coated shaft and impellers polycarbonate shaft and impeller. All the gaskets shall be of food grade nitrile or neoprene rubber material. Calculates agitator speed and power requirement for a given reactor geometry and mixture properties.
Power required to operate an agitator depends on several factors such as the properties of the liquid, agitator type and size, the tank or vessel size and speed of agitation. A practical guide to shaft alignment plant services. This will be the case unless the shaft is overloaded or. The rotational speed is 100rpm, the viscosity 20 cp and the sp. Shaft coupling design article containg design procedure and numerical problems of different types of couplings commonly used. Torque shaft power fluid density shaft speed2 impeller diameter5 2 pi. Material selection the agitator shaft was made from a standard aisi type 316 stainless steel that is austenitic grade. To calculate mass matrix, stiffness matrix in the torsion element shown in figure 6 as follows. The product mixed is so sensitive, that is why that design has been used. Such as may be established by gas and provides a large axial flow volume without flooding and withstands variable loads on the blades.
Figure 881 shows a typical standard tank figure 81. Mechanical agitator power requirements for liquid batches. Mixer agitator mixtank calculators white mountain process. Proven models of geometry as well as load cases that cover the unpredictable directions of tolerances and related forces are necessary. Agitator power reqiurement calculator excel design extensoin calculators, softwares 81 comments file extension xls.
Shaft design for industrial tank agitators 4 from a mechanics point of view, it is generally easy to replace a steady bearings wearing components. In most agitators, the actual relationship between torque and density is. Sawtooth 27 9 sheets screenshots 37 m g m 9 inputs inputs moc of vessel shaft type of impeller motor hp cal. Figure 3 shows a cfdcalculated impeller shaft, which is equipped with diameter from 240 mm to. Design and implementation of differential agitators to maximize agitating performance 100. The first shaft is the bearing axis while the second shaft is the axis of the quartet upper bearing impellers group and the triple lower group which are called as agitating group. Other attachments include inlet and outlet lines, coils, jackets, and wells for thermometers.
If a belt or cable runs around a fixed shaft, friction between the belt and the shaft can cause the efficiency to be low, and the cable can rapidly wear. Various forces contribute to the load that a shaft must contend with. The twopiece design allows for easy disassembly without having to move the tank or physical stand. The mathematical complexity of turbulent flow makes it impossible to use analytical methods and. Design of shaft length of agitator posted in industrial professionals. The fundamental approach is straightforward, design for power torque and speed, then shaft loads, and finally mixer dynamics. Determine torque in shafts from gears, pulleys, sprockets, clutches, and couplings. When calculating the electric power of a motor, we are urged suppose that.
The second step in the design sequence is the mechanical design of the mixer components. First, the torsion and bending loads, previously calculated for shaft design, must be used to design the mounting. The calculus of the mixing rotating devices shafts based on the energonics method 109 on each mixer i i 1,n0 mounted on the shaft, a bending radial force acts either in the xoy plan being notedfy,i, or in the xoz plan being noted fz,i, depending on the mixer blades orientation as function of the chosen coordinate system. Type selection ow llow f llf a ia x ax i a ow llow f llf ia a d ad i ra r flow. We then calculate deflection, due to this force and impeller with hub acting at the end. Pdf geometry and architecture of mixing agitator a. Customer questionhow are industrial agitators and blender designs evaluated and agitator shaft design calculation filetype can i be sure that my process goals will. Types of agitators, agitators design and significance. Review on design of agitator to optimize its performance. Rapid mixing by radial and axial impellers theory where. Turbulence turbulence is one of the most studied and unsolved phenomena of our century.
Lower shaft through vessel nozzle into tank and support with approximately 8 inches of shaft extending above the vessel flange. Anonymous 17 october at hello sir, i am chemical engineering student i agitator shaft design calculation filetype doing my final year calculatioon on extraction of oil from slurry in oil refineries. Oct 27, 2018 agitator shaft design calculation filetype pdf download. Design calculation of theoretical torque at slurry tank agitator. Two types single multi duty agitator duty agitator vineet. The amount of data needed and generated in shaft and bearing calculations is huge. Coupling the output shaft of the motor to the impeller shaft was achieved by a twopiece rigid shaft coupling. This paper is concerned with the fracture analysis of an agitator shaft of a large vessel and predicting its high cycle fatigue life. Motor hp shaft diameter critical speed blade thickness. The mixing arena is the boxing ring where chemist and chemical engineer fight in the work done.
A coolable agitator shaft is also available as an option. Shafts are breaking or cracking at or close to the inboard bearings or coupling hubs. I attach a file with further information on the impeller design. Pressure vessel design part3 welding type and its symbol on drawing duration. S in pdf file costing purpose inputs moc of vessel shaft type of impeller. Constructed of stainless steel to match shaft material, the coupling handles thrust and torque loads, as well as the maximum speed rating. Shaft design the shaft is attached to the motor gear and may be located in vertical position. Food for thought you wanted to stir things up but, your mixing gave only agitation. Agitator design and selection standard engineers vineet. Consequently, it is impossible to analyze all combinations.
Jan 18, 2009 design of shaft length of agitator posted in industrial professionals. Pressure vessel design part3 welding type and its symbol on drawing. Apr 03, 2018 calculations contact me documentation equipment design forum how to softwares write for us about mepharma engineering an engineers choice home agitator design types of agitators, agitator s design and significance po pular po sts recent po st types of agitators, agitator s design and signi cance types of agitators, agitator s design and significance ajay kumar kalva year ago agitator, design. Review on design of agitator to optimize its performance rahul h. Agitator design and agitator systems about us we have figured it out stelzer ruhrtechnik is one of the leading companies in agitation technology and a soughtafter solutions partner for projectspecific process technology solutions. Designing for anomalies the first step in assessing a design is to calculate the power and torque absorbed by the proposed agitator. Shaft is verified by both analytical and fem method, resulting into similar output.
This is essential for the design of the rotating system including shaft, rotor. Redesign and structural analysis of agitator shaft for. Mixing is accomplished by the rotating action of an impeller in the continuous fluid. My company has two sites the result will be pure theoretical and it is subjected to descaled equipments. Design of pressure vessels, jacketed vessels, mixing. It provides high speed radial flow stirring, while drawing head space gas down a hollow shaft and dispersing the gas through the impeller ports, for effective entrainment of the gas into the liquid. This research is to design and implement a new kind of agitators called differential agitator. Agitator shaft design calculation filetype pdf by allisonivue issuu. It provides for the optimisation of stirrer power consumption as well as the scaleup of lab scale processes to. Devices to produce agitationpower consumption of agitators blending and mixingsuspension of solid particlesdispersion operations agitator selection and scale up abraham rogelio martin garcia. Impeller design for mixing of suspensions tomas jirout, frantisek rieger czech technical university in prague, faculty of mechanical engineering, department of process engineering, technicka 4, 166 07 prague 6, czech republic abstract this paper deals with effect of impeller type on offbottom particle suspension. Dynamic characteristics analysis of agitator design for.
Jul 17, 2015 agitator power consumption calculation posted in industrial professionals. Type of fluid and its physical state, the degree of agitation and geometry of vessel makes an important role for the design and selection of agitator components. Good shaft alignment practice should be a key strategy in the. More corrosionresistant alloys are used when necessary. Agitators for standard tanks ms i anchor type agitators anchor type agitators are principally designed to mix highly viscous products and nonnewtonian fluids, i.
This means that the powertospeed ratio is typically a square function. Design of shaft length of agitator industrial professionals. In addition to agitator design and power requirements, which are fundamental to mixing systems, many. The agitator shaft has a circumferential notch around it and. Student 2professor 1,2department of mechanical engineering 1,2msss cet, jalna abstractmixing is very important operation in any process industry. Design and implementation of differential agitators to maximize. Pdf design of agitator 8 batch volume kapil kapure. Never lift the agitator using the extension shaft as a lift point. Btn agitators installation, operation maintenance manual. The differential agitator is an electro mechanic set consists of two shafts. Cerebro mix light non pressurised tank and mixer design cerebromix is used for the calculation of agitated nonpressurised process tanks. Velocity gradient, secg 700 to sec1 power imparted to the water, nms or watt or kg. Design of agitator shafts for mixing tanks and reactors. S in pdf file costing purpose inputs moc of vessel shaft type of impeller motor hp cal.
Agitation scaleup calculation does the scaleup from smaller to larger scale based on criteria like equal tip speed, power per unit volume, equal reynolds number, equal shaft speed. The lowerradial impeller has a concave blade design. Any type of shock or impact should be avoided as the carbon seal element is easily damaged. Design and implementation of differential agitators to. The agitator impeller type that has been designed based on the operating conditions. Proquip always uses a wear sleeve on the end of the industrial mixer shaft. Fracture and fatigue analysis of an agitator shaft with a.
Design of flanged coupling unprotected and protected type notations used in design. Here we will discuss the design of agitator vessel based on practical data inputs as given below. In this paper, we have mainly focused on different types of agitator used in industries to increase the mixing performance. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Calculations of hydraulic, dynamic and electrical forces. Roper design of impellers for inducing gas dispersion in fermenters is a widely published topic that has typically emphasized such issues as agitator power, liquid holdup and. Energy utilization in different types of agitators. Jan 04, 2019 you can have a bottom bearing for shaft you can select sizes for parts of impeller. The differential agitator is an electro mechanic set consists of. Relationship between torque and density in agitator. The most common types of resources of phosphate ores are. A pulle y reduces these effects with rolling contact between the cable and.
I am asking this because on low level alarm 20 % of tank, agitator is not getting immersed in liquid resulting in frequent damage to bearing due to vibration so we have changed alarm value to 50% instead of 20%. Agitator shaft length should be calculated on which basis. Design specification of the motor is then determined by. Versatility without limits the netzsch zeta grinding system has a wide range of applications and is equally suited both for processing very lowviscosity products. It includes all of the features of cerebrotank, plus the complete design of tank agitators including impeller design and stirrer motor selection. Design of agitator free download as excel spreadsheet. Pdf this research is to design and implement a new kind of agitators called differential agitator. Chempute software nonpressurised tank and mixer design. Large api storage tanks covering atmospheric and pressurized tanks. Process engineering mind mixer mechanical design chemical. Tutorial for gear design and calculation with mdesign gearbox. If an agitator is not correctly designed for these fluids, the mixture in regions near the walls can be completely stagnant. Agitator design spreadsheet reactor vessel youtube.
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