Scale of agitation 1 is quite mild, 3 is normal, 6 is vigorous and 10 is violent. Agitator should be designed to operate at less than 70% of the critical speed. More recently 03 torque measurements have been made by use of a strain gauge mounted on the agitator shaft. Velocity gradient, secg 700 to sec1 power imparted to the water, nms or watt or kg. Because the settling power and thus the agitator pow er are proportional to the hindered settling velocity, choosing the design particle size is very important. General test procedure and design methodology are based on the assumption that the. Special properties for the customers benefit calculation, manufacture and design are in accord with pressure equipment directive 9723eg orand asme ustamp as well as with cgmp and fda. 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. Jan 18, 2009 design of shaft length of agitator posted in industrial professionals. In addition to agitator design and power requirements, which are fundamental to mixing systems, many other considerations also play a part in maximizing performance.
Longer shafts and larger impellers cause more severe loads on topentering mixers than portable mixers. Agitation and mixing presentation outlinedefinitionspurposes of agitation. For example, the sun is the agitation source for mixing in the earths atmosphere. Cerebro mix light non pressurised tank and mixer design cerebromix is used for the calculation of agitated nonpressurised process tanks. Review on design of agitator 1akash j patil, 2sachin b rajude 3mayur s thok, 4ajit r pawar be student. Based on this, program for design and drawing of agitator mixer will select number of impellers. Design of agitator free download as excel spreadsheet. Agitator shaft design calculation filetype pdf energy utilization in different types of agitators design calculations the mixer shaft is located off center onefourth to onehalf the tank radius, the. It provides for the optimisation of stirrer power consumption as well as the. Close clearance agitator highspeed impeller design layout of agitators. Proquip agitator shafts are designed to exceed industry standards and meet the requirements of a wide variety of industrial mixing applicationsprocesses.
Oct 27, 2018 agitator shaft design calculation filetype pdf download. Efforts have been made to confirm the accurracy of all calculations. Introduction to nonnewtonian fluid and power requirement for nonnewtonian fluids d. Jan 04, 2019 agitator shaft design calculation filetype pdf energy utilization in different types of agitators design calculations the mixer shaft is located off center onefourth to onehalf the tank radius, the. Use this ms excel spreadsheet to calculation the power requirements and mixing intensity for a defined mixing application. Agitation and mixing of fluids purpose of agitation. Designing for anomalies the first step in assessing a design is to calculate the power and torque absorbed by the proposed agitator. The first shaft is the bearing axis while the second shaft is the axis of 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. Design calculation of theoretical torque at slurry tank agitator. Compare combined stresses to suitable allowable stresses. Mt nm shaft torque mt homogeneity time njs s1 minimum shaft speed for suspension n s1 agitator speed ntm dimensionless mixing time nu nusselt number. Design of turbines 6 5 4 3 2 1 4 1 12 1 5 1 1 3 1 3 1 s d l s d j s d w s d h s d e s d d a t a t t t a. Chapter 16 mixers and agitators many process operations involve fluid mixing.
Mechanical design of mixing equipment figure 211 directdrive portable mixer. In addition, the article reflects the theoretical calculation of the lobed mixer, the technique of the experiments. The differential agitator is an electro mechanic set consists of two shafts. When a mixer is installed up at the site it is easy to make sure the calculations where correct. We are looking at designing a pressure vessel that has a center mounted agitator on. Agitator design software download intensiveoffshore. If there is a pulley you can select sizes for pulley.
On internet i found articles for power consumption calculation for agitator with one impeller only. Design of shaft length of agitator posted in industrial professionals. Motor hp shaft diameter critical speed blade thickness coupling selection. Determine torque in shafts from gears, pulleys, sprockets, clutches, and couplings. This research is to design and implement a new kind of agitators called differential agitator. Agitator design and selection standard engineers vineet. Program for drawing of agitator mixer for chemical process vessels. Jul 17, 2015 agitator power consumption calculation posted in industrial professionals. The first calculation is for the torque on the shaft. Several standard designs materials to match the vessel. I wanted to calculate power consumption of agitator having 3 impellers installed on a single shaft and running at same speed. The bearing sat in a bracket bolted under the top of the tank and the shaft was coupled to the gearbox. Fracture and fatigue analysis of an agitator shaft with a.
However, the developer accepts no responsibility for the accuracy, use of or calculation results derived from herein. The computeraided design cad files and all associated content posted to this website are created, uploaded, managed and owned by third party users. Pdf design and implementation of differential agitators to. The fundamental approach is straightforward, design for power torque and speed, then shaft loads, and finally mixer dynamics. Chempute software nonpressurised tank and mixer design. The motor power is used in the torque and bending calculations to design for. Motor hp shaft diameter critical speed blade thickness coupling selection bearing selection for vessel. Our core business was and is the technical design and production. How do i calculate the effect of supporting the agitator shaft at bottom or in the middle on diame. Agitator design spreadsheet reactor vessel youtube. This means that the powertospeed ratio is typically a square function. 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. 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. Design and implementation of differential agitators to maximize agitating performance saeed asiri king abdulaziz university, 21589, jeddah, p.
Design and implementation of differential agitators to. Agitator shaft length should be calculated on which basis. If an agitator is not correctly designed for these fluids, the mixture in regions near the walls can be completely stagnant. All software provided asis with no warranty, expressed or implied, available. Torque shaft power fluid density shaft speed2 impeller diameter5 2 pi. Description download agitator design calculation free in pdf format. Agitator shafts thrust bearing accendo reliability. If the impact of the material density is included in the calculation, the gravity vector is aligned with the y axis. Calculates agitator speed and power requirement for a given reactor geometry and mixture properties. Power was sent through the differential to the agitator shaft a t one end of the axle, while the torque required to prevent rotation of the other end was mixing and agitation 5 measured with a system of levers and a scale. Relationship between torque and density in agitator. Excel sheet has been simulated for design of agitator and you can download it here. Mechanical agitator power requirements for liquid batches. A simple story about a modified agitator shaft thrust bearing that went wrong.
Problem 1 on design of shaft design of machine duration. 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. The sound design of a doubleshaft mixer with a horizontal shaft and rectangular buildings are given in. Pdf justification of the design of the twoshaft mixer of forages. Shaft design objectives compute forces acting on shafts from gears, pulleys, and sprockets. Design of shaft length of agitator industrial professionals. Scribd is the worlds largest social reading and publishing site. Results from this calculation procedure are in general agreement with the experimental results of. Excel sheet has been simulated for design of agitator and you can download it here, download here. For example, arcane details within a specific gear reducer design or who makes the gear reducer would tend to lower competitive pressure on pricing and technical qualification.
Oct 06, 2018 agitator shaft design calculation filetype pdf download. S in pdf file costing purpose inputs moc of vessel shaft type of impeller motor hp cal. The shaft for a mixer, especially a large one, involves significant mechanical. After input of design data is completed, the program provides tables for entering of average properties of media. Food for thought you wanted to stir things up but, your mixing gave only agitation. Program for design and drawing of agitator mixer then calculates how much time it will take for full, mixing. Agitator power requirement and mixing intensity calculator. Pdf design of agitator 8 batch volume kapil kapure. Step by step procedure for troubleshooting steam ejectors. For our case, the density is entered, and the media is defined as newtonian fig.
Tank shape figure 163 depicts the nomenclature used in explaining mixer layout and design. Are these unique features truly beneficial or are they to limit competitive pressure. This dissertation work is aimed to redesign existing single impeller agitator shaft by using ss316 material with double impeller. As per the design calculation existing agitator gb is designed for max. Agitator selection depends on the viscosity of the liquid for specific time of mixing, the best mixer is the one. It includes all of the features of cerebrotank, plus the complete design of tank agitators including impeller design and stirrer motor selection. Types of agitators, agitators design and significance. This paper is concerned with the fracture analysis of an agitator shaft of a large vessel and predicting its high cycle fatigue life. 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.
Redesign and structural analysis of agitator shaft for. This dissertation work is aimed to redesign existing single impeller agitator shaft by. Characteristic of application requiring minimum fluid velocities to produce a flat but moving fluid batch surface. The second step in the design sequence is the mechanical design of the mixer components. Custom engineering of impeller design can be performed based on developed horsepower, viscosity, critical speed and other key factors associated with specific processes. The differential agitator is an electro mechanic set consists of. Rapid mixing by radial and axial impellers theory where. The agitator shaft has a circumferential notch around it and. Agitatormixers providing tools for research and industry at a glance.
The additional power required to circulate the liquid can be neglected for most technical applications. Vessel baffling is required for optimum performance. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. To download sample drawings and input data sheets to request for trial program and. It is an outline of the chemical engineering discipline, related principles and calculation methods. The work is carried out to reduce deflection by optimizing the design or by using different materials like ss, ss304 and ss305. Therefore, descriptions, equations, and nomenclature will be given in both u. Agitators and agitator shaft assemblies passing through the seals shall be designed and. The original design is shown in figure 1 and the new design in figure 2. In most agitators, the actual relationship between torque and density is. Agitator shaft length vessel height based on geometry of vessel, many factors for impeller can be decided. 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 specification of the motor is then determined by. Agitator design calculation free download as pdf file. Mixer agitator mixtank calculators white mountain process. Pradeep nayak from india, mumbai vessel moc ss304 liquid density p 1200 kgm3 liquid viscosity 50 cp 0. The equations for this calculation can be found in the shaftdesignhydrofoilsteadybearing. Followed by shaft design, different crucial components of the mixer such as motor. Find bending moments from gears, pulleys, or sprockets that are transmitting loads to or from other devices. 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. The purpose of this chapter is to provide practical information about the mechanical design of mixing equipment.