It is an outline of the chemical engineering discipline, related principles and calculation methods. Proquip agitator shafts are designed to exceed industry standards and meet the requirements of a wide variety of industrial mixing applicationsprocesses. Design of shaft design of solid shaft subjected to shear stress for selected motor power rated torque and maximum torque is calculated as given below. Agitator shaft deflection free download as pdf file. Design and implementation of differential agitators to. Scale of agitation 1 is quite mild, 3 is normal, 6 is vigorous and 10 is violent. Types of agitators, agitators design and significance pharma helical agitators. Agitator design spreadsheet reactor vessel youtube. Custom engineering of impeller design can be performed based on developed horsepower, viscosity, critical speed and other key factors associated with specific processes. Where of is the overload or service factor, for example if the maximum torque is 20% more than mean torque then of should be taken as 1. In the construction, mild steel was chosen due to its inherent properties.
Chempute software nonpressurised tank and mixer design. Mixer agitator mixtank calculators white mountain process. Program for design and drawing of agitator mixer then shows final values that will be used for. Design calculation of theoretical torque at slurry tank agitator. It includes all of the features of cerebrotank, plus the complete design of tank agitators including impeller design and stirrer motor selection. These agitators have blades with a twisted mechanism, just like the threads of a the curves result in a vigorous motion of the. Process design spreadsheets excel spreadsheets of ludwigs applied process design. Shaft design the shaft is attached to the motor gear and may be located in vertical position. Types of agitators, agitators design and significance. Relationship between torque and density in agitator. Redesign and structural analysis of agitator shaft for. Agitator design mechanical motor gearbox seal shaft impeller vineet. One free variable in industrial mixer shaft design is its stiffness, which is.
The fundamental approach is straightforward, design for power torque and speed, then shaft loads, and finally mixer dynamics. Cerebro mix light non pressurised tank and mixer design cerebromix is used for the calculation of agitated nonpressurised process tanks. I offer design and drawing program which designs and draws a detailed drawing of agitator mixer, with user friendly dialog boxes, which is an addon for any cad program for designing and developing ga drawing for agitator mixer. Based on this, program for design and drawing of agitator mixer will select number of impellers. Agitator components mainly include impeller, shaft, gear box and drive motor suitably designed for meeting the process requirement. Calculates agitator speed and power requirement for a given reactor geometry and mixture properties.
This dissertation work is aimed to redesign existing single impeller agitator shaft by. This process keeps the solid particles moving just above the bottom of the vessel preventing the settling of solids. As per the design calculation existing agitator gb is designed for max. This means that the powertospeed ratio is typically a square function. If an agitator is not correctly designed for these fluids, the mixture in regions near the walls can be completely stagnant. Agitator shaft deflection bearing mechanical gear scribd. Review on design of agitator to optimize its performance rahul h. Mixing refers to the actual stirring of different liquids andor materials to blend them together into an end product or mixture. Static analysis calculate the effects of steady loading. When a mixer is installed up at the site it is easy to make sure the calculations where correct.
Agitator shaft design calculation filetype download in this method for tr amps agitator shaft design calculation filetype differ form your result dear pratim, the first agitator shaft design calculation filetype is based on the over all heat transfer coefficient of the reactor, this may vary based on scaling and fouling factors, and the second. The loads are active and are transmitted from the impeller blades to the agitator shaft and then to the gear box. Ss304, ss304l, ss316, ss316l, c22, cs and custom to add bottom shaft support. 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. Agitator design is often though as the application of two engineering disciplines. Once this mixture is mixed it may require agitation to keep the mixture in the proper mixed state. Shaft design for industrial tank agitators thomasnet. Agitation is the process of keeping a mixture that has been mixed in the proper mixed state required for the end product. A stuffing box or seal is used for preventing leakage through this clearance. In both cases a twostage ekato viscoprop agitator system with an impeller diameter d 2 1100mm serves as basis for the calculations.
First, the torsion and bending loads, previously calculated for shaft design, must be. Oct 06, 2018 agitator shaft design calculation filetype pdf download. Torque shaft power fluid density shaft speed2 impeller diameter5 2 pi. Shaft is verified by both analytical and fem method, resulting into similar output.
Jun 19, 2011 agitator components mainly include impeller, shaft, gear box and drive motor suitably designed for meeting the process requirement. Agitator shaft length should be calculated on which basis. Figure 881 shows a typical standard tank figure 81. To allow free rotation of shaft, a clearance must be maintained between these adjacent parts. A general result for the form of the fluid force equation can be developed. After input of design data is completed, the program provides tables for entering of average properties of media. A large change in stiffness close to the top of the shafting where the small gearbox shaft is coupled to the large tank shaft concentrates the. These formulas are used to solve either a shaft with one or more sections or a beam with one constant section with multiple supports and loads. Jan 18, 2009 design of shaft length of agitator posted in industrial professionals. However, the developer accepts no responsibility for the accuracy, use of or calculation results derived from herein. Calculation and design of critical speed and power agitator.
Motor hp shaft diameter critical speed blade thickness coupling selection bearing selection for vessel. In this section you can find process engineering related calculations in free excel sheet templates design of agitator. Types of agitators, agitator s design and significance pharma today i gonna give you a description that limits upto my knowledge, and most of you may find it useful, about the industrial agitators, types of agitators. Mechanical agitator power requirements for liquid batches. If you are not familiar with your companys mixing vessel entry procedure, contact your. Pressure vessel shell thickness calculation as per ug 27 duration. Our core business was and is the technical design and production. 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. The work is carried out to reduce deflection by optimizing the design or by using.
The first step is process design from a chemical viewpoint and involves the specification of the impeller pattern, speed, temperature and blade angle. The differential agitator is an electro mechanic set consists of. 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. This will be the case unless the shaft is overloaded or damaged. Jan 04, 2019 agitator shaft design calculation filetype pdf posted on january 4, 2019 by admin energy utilization in different types of agitators design calculations the mixer shaft is located off center onefourth to onehalf the tank radius, the resulting.
A single particles freesettling velocity, vs, is calculated by methods given in. We then calculate deflection, due to this force and impeller with hub acting at the end of shaft via. A crack starts at a stress concentration from a keyway or a sharp radius, or, in rare cases, from a material impurity. Oct 27, 2018 agitator shaft design calculation filetype pdf download. 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. It consists of three basic components which are the shaft, blade and the vessel. 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%. Nov 08, 20 agitator design mechanical motor gearbox seal shaft impeller vineet. Agitator shaft is important component of agitation system used in reactor pressure.
Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The viscosity of newtonian media is independent of the agitator shaft speed or shear rate. Efforts have been made to confirm the accurracy of all calculations. To design calculations at different viscosities illustrate the typical effect of viscosity on the required agitator power. A good industrial mixer design cannot use a gearbox that has an output shaft significantly smaller than the mixer in tank shaft, even if the overall critical speed of the system would be sufficient. Introducing or discovering the types of agitators in pharma field is certainly a revolution because different agitators will have different purposes and different advantages, but most commonly used agitators are anchor, propeller, turbine, paddle etc. Design of shaft length of agitator posted in industrial professionals. Basic guidelines for design of slurry mixing agitators. The second step in the design sequence is the mechanical design of the mixer components. Customer questionhow are industrial agitators and blender designs evaluated and agitator shaft design calculation filetype can i be sure that my process goals will.
Design of shaft length of agitator industrial professionals. Abstractthis paper describes the mechanical design of agitator to mixing polyectrolyte having. Agitator shaft the agitator shaft are one of the core components in the mixing system. Abstract propeller agitator is a specialized of various types of substances. To find diameter of shaft to transmit required torque. Design specification of the motor is then determined by. If the impact of the material density is included in the calculation, the gravity vector is aligned with the y axis. If there is a pulley you can select sizes for pulley.
It provides for the optimisation of stirrer power consumption as well as the. Various forces contribute to the load that a shaft must contend with. Paddle mixer design, phosphate fertilizer, autodesk inventor, fem. Shaft design objectives compute forces acting on shafts from gears, pulleys, and sprockets. Basic guidelines for design of slurry mixing agitators blogger. Other attachments include inlet and outlet lines, coils, jackets, and wells for thermometers. The mixing process for keeping the solids in suspension is known as offbottom suspension. The design of mixers usually consists of a prime mover, gear reduction unit, a shaft, and impellers. The work is carried out to reduce deflection by optimizing the design or by using different materials like ss, ss304 and ss305. Review on design of agitator to optimize its performance. When designing the agitator shaft, it should be checked through calculation of bearing torque of whole equipment, calcu. Multiduty mixer or universal mixer any mixing task requiring flow or shear any unit process or any unit operation from violent dispersions to gentle crystallisation all in same reactor vineet.
Reactor design with agitator shaft using cadempvd duration. For our case, the density is entered, and the media is defined as newtonian fig. Since then, several other impeller designs have been developed to satisfy specific industry needs. Calculation of power requirement for newtonian fluid c. Characteristic of application requiring minimum fluid velocities to produce a flat but moving fluid batch surface. Student 2professor 1,2department of mechanical engineering 1,2msss cet, jalna abstractmixing is very important operation in any process industry. 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.
Using this formula the toque acting on the shaft is calculated. Design of the mixer support must consider all of the mechanical loads on the mixer figure 1. To allow free rotation of shaft, a clearance must be. Figure 1 illustrates the forces acting on the impeller and shaft configuration. Longer shafts and larger impellers cause more severe loads on topentering mixers than portable mixers. In most agitators, the actual relationship between torque and density is. Find bending moments from gears, pulleys, or sprockets that are transmitting loads to or from other devices. This dissertation work is aimed to redesign existing single impeller agitator shaft by using ss316 material with double impeller. Compare combined stresses to suitable allowable stresses. Introduction to nonnewtonian fluid and power requirement for nonnewtonian fluids d. This paper outlines the mechanical design procedure of a mixer based on the fluid. Designing for anomalies the first step in assessing a design is to calculate the power and torque absorbed by the proposed agitator. Shaft speed scaling is done based on following relation.
This research is to design and implement a new kind of agitators called differential agitator. Short term training programme on process engineering. Design and implementation of differential agitators to maximize agitating performance saeed asiri king abdulaziz university, 21589, jeddah, p. Process engineering calculation in excel spread sheet. The value of n, called the scaling exponent, depends on the physical result to be scaled. Determine torque in shafts from gears, pulleys, sprockets, clutches, and couplings.
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