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