Calibrating a pressure gauge using an air-operated dead-weight pressure gauge tester for air gauges

Calibrating a pressure gauge using an air-operated dead-weight pressure gauge tester for air gauges INTRODUCTION: Calibrationis the set of operations that establish the relationship between the values of quantities indicated by a measuring instrument and the corresponding values realized by standards. The result of a calibration allows for the determination of corrections to be made with regards to the indicated values. It may also help in determining other metrological properties such as the effect of influence quantities. The results of a calibration are usually documented and referred to as calibration certificate or a calibration report. Necessary adjustments are made to the instrument after calibration so that it always indicates readings corresponding to given values of the quantity measured. When the instrument is made to give a null indication corresponding to a null value of the quantity to be measured, the set of operation is called zero adjustment . The Calibration Process The first thing to consider in calibrating an instrument is its design. In order to be able to calibrate an instrument, the design of the instrument has to be capable of measurements that are withinengineering tolerance when used within certain conditions and over a reasonable period of time. The criteria used for assigning tolerance values vary according to regions and according to type of industry. Manufacturers of instruments assign a general measurement tolerance and suggest the calibration interval as well as the optimum environment for use and storage of the instrument. The user of the instrument on the other hand assigns the actual calibration interval, on the instruments likely usage level. For example, if a manufacturer states that an instrument needs to be calibrated after usage for 8-12 hours of use 5 days per week is six months, that same instrument in 24/7 usage would generally get a shorter interval. The assignment of calibration intervals can be a formal process based on the results of previous calibrations. Calibration process versus cost Generally, the process of calibrating an instrument is a difficult and expensive one. As a rule of thumb, the cost for ordinary equipment support is generally about 10% of the purchasing cost of the instrument on a yearly basis. Exotic devices such asscanning electron microscopes,gas chromatographsystems andlaserinterferometerdevices can be even more expensive to calibrate. When the instruments being calibrated are integrated with computers, the integrated computer programs and any calibration corrections are also under control. The calibration paradox Successful calibration has to be consistent and systematic. At the same time, the complexity of some instruments requires that only key functions be identified and calibrated. Under those conditions, a degree of randomness is needed to find unexpected deficiencies. Even the most routine calibration requires a willingness to investigate any unexpected observation. Theoretically, anyone who can read and follow the directions of a calibration procedure can perform the work. It is recognizing and dealing with the exceptions that is the most challenging aspect of the work. This is where experience and judgement are called for and where most of the resources are consumed. THEORY Principles of Operation Of Dead Weight Testers Pressure is defined as force per unit area i.e. P=F/A F=M x g (product of mass and the acceleration acting on that mass) This simple principle is used by Dead weight pressure testers to generate a very stable and accurate pressure. A series of weights are loaded on to a piston unit which is housed inside a cylinder. In principle, the components of the above equations are as follows: A is the effective cross-sectional area of the piston unit M is the mass of the weights loaded on top of the piston unit in addition to the mass of the piston unit itself. g is the gravitational acceleration acting on the piston and mass set. For example, if a piston of area A = in2 (0.18cm2) weighing M = 12.5lb (5.67kg) is supported by a fluid in a cylinder, the pressure in the fluid is 12.5lb=100lb/in2 (7kg/cm2). The piston- cylinder and the weights are called a dead-weight balance. The effective area of the piston and cylinder unit is an approximation of the average of the areas of the piston and of the cylinder. The performance of a tester depends largely on the accuracy with which the piston and cylinder are manufactured. These should be straight and round and have a good finish. They are usually made from hardened and stabilised tool steels, however, on the air operated type, high chromium steel is used to prevent corrosion. They are protected from high pressure such that the piston would not leave its cylinder and if the weights are supplied without air- pressure, the piston will not be in compression. The accuracy can be illustrated by stating that a variation of 0.1ÃŽÂ ¼m on the effective diameter of a piston/cylinder unit would result in an area charge of 63ppm. The area of the piston-cylinder units are compared with NPL Standards. Two units can be compared by connecting them hydraulically (or on gas) under pressure; when they were in balance, the area say AD to be determined was found from the known area of an NPL unit say Ak, showing the weights applied to each say WD and Wk from the equation. When instrument accuracies are calculated, allowance is made for the fact that effective area of the piston/cylinder unit increases with pressure. These is negligible on low pressure testers but becomes significant on testers such as type 380D (600 bar) and 380H (1200 bar). For the 4000 bar type the weights for equal increments of pressure are greater as the pressure increases up to 4000 bar and weight must be applied in the correct sequence. The accuracy certificate of a tester takes into account the buoyancy of the piston immersed in liquid. When testing gauges on liquid it may also be necessary to allow for liquid head (1 cm corresponds to 1 mb). The datum levels of the hydraulic piston/cylinder units are marked with a groove on the outer diameter of the unit. The effect of heads could normally be ignored on air testers. The certificate also gives details of the corrections to be made for change in temperature of the unit from 20oC due to expansion of the piston/cylinder unit and also of corrections due to g varying from standard gravity. The hydraulic testers can have accuracies of 0.01% on 1/16 in2 piston/cylinder unit, 0.015% on 1/80 in2 and 0.02% on 1/160 in2 units. Apparatus: 1. A pressure gauge that could measure up to 100 lb/in2bar 2. A Budenberg an air-operated pressure gauge calibrator: Made with levelling screws at its base which is used to mount it on a bench, a 0.5 square inch piston-cylinder unit, two control valves, one 0.5 inch B.S.P gauge connection, some weights (each marked with corresponding pressures they exert). The apparatus can basically be divided into three elements: The piston and cylinder units The weights The testers. The Piston-Cylinder unit The effective area of the piston and cylinder unit is an approximation of the average of the areas of the piston and of the cylinder and is 0.5 in2. The weight exerted by the unit is 0.1 kg/cm2 or 0.1bar. The Piston-Cylinder unit is made from high chromium steel is used to prevent corrosion. It is also fitted with mechanical stops to prevent the piston leaving the cylinder housing if the applied pressure is excessive, and if the weights are supplied without air- pressure, the piston will not be in compression. There is a small gap between the piston and the cylinder so that when the piston rotates in the cylinder the pressure medium forms a bearing eliminating friction and metallic contact; any viscous forces are circumferential and so do not act in a vertical direction and so do not affect the accuracy of the balance. If the gap between the piston and the cylinder is too small, the piston will not rotate freely at low pressure long enough for a true balanced pressure to be attained. If the gap is too large, there will be a leakage between the two and the piston will fall in the cylinder. The piston will spin for a reasonable length of time at low pressure and will remain in its floating position for several minutes at high pressures. The Weights The weights used are DH-Budenberg, manufactured from series 300 austenitic stainless steel, which makes them highly resistant to corrosion and magnetic permeability. They are marked with the nominal pressure value that they will generate (in bar) when used with the piston-cylinder unit they are designed for. These weights have been manufactured to specific set of tolerances and according to National (NPL) standards to give an accuracy of 0.015% under all nominal conditions. They give the appropriate force when subjected to a gravitational acceleration of 9.80665m/s2(International Standard, g) and in an air of density 1.2 kg/m3. The Tester This is the last element of the dead-weight tester. This unit is generally called the pneumatic dead weight tester base. It is the unit that generates the pressure which is then applied to the piston-cylinder unit and the instrument under calibration. It is supplied with an incoming port where a clean dry non-corrosive source of gas is connected. The type 240 air-operated tester has two valves: one valve to admit air from a H.P. supply to raise the pressure and one to release air to the atmosphere. PROCEDURE 1. The gauge to be calibrated was properly cleaned to remove any dirt or chemical contamination that could contaminate the tester. Using a bonded seal at the joint the Gauge was screwed on to the calibration equipment. 2. Using the conversion table given, (see table 2) the weight required in bar to test a pressure indicated by the gauge (the one being calibrated) was checked and the dead-weight piston was loaded with weight equivalent to the desired pressure less the pressure of the Piston-Cylinder unit. For example, when it was required to test the 10 lb/in2 reading on the gauge scale, the amount of weight required was 0.69 bar (from the table). But the piston already weighed 0.1 bar so this was subtracted from 0.69 bar to get 0.59 bar. So only 0.59 bar of weight equivalent was loaded onto the piston. 3. Next, the left-hand valve which releases pressure from the tester was closed. 4. Then, to test for rising pressure, the right-hand valve which admits pressure to the tester was opened carefully. This admitted pressure into the tester and the rate of pressure rise was watched on the gauge under test. As the pressure approached the desired value to be tested, the weights were spun carefully, and as soon as the piston began to float half way between the two stops, the reading of the pressure gauge was taken. The release valve was opened and the admitting valve was closed. 5. Next, to test for falling pressure, the release valve was closed and the admitting valve was opened. As the pressure rose beyond the desired pressure, the admitting valve closed and the release valve was opened slowly to enable the pressure drop in the tester. As the pressure approached the required pressure, the weight was spun carefully and ss soon the piton began to float half way between the two stops, the reading on the gauge was taken. All the pressure was then released. 6. A new set of weights were loaded on the piston to test the next pressure reading. These steps were carried out for pressure readings of from 10 lb/in2 to 100 lb/in2 at intervals of 10 lb/in2. The readings obtained were tabulated in table 2. RESULTS The results obtained were tabulated as in below Pressure being tested (lbf/in2) Applied Load Minus 0.1 (bar) Actual reading Up pressure (lbf/in2) Down Pressure (lbf/in2) 10 0.69 10.5 9.50 20 1.38 19.50 19.00 30 2.07 29.50 29.00 40 2.76 39.00 39.00 50 3.45 49.50 49.00 60 4.14 59.50 59.00 70 4.83 69.00 69.00 80 5.52 79.00 78.50 90 6.21 89.00 88.50 100 6.9 99.00 99.50 Table 1 showing readings from calibration exercise. CONCLUSION The calibration of the pressure gauge using a dead weight tester was carried out; Based on the experimental results obtained a deviation in the calibrated reading was compared to the theoretical values. Therefore the pressure gauge on the downwards pressure was observed to be not appropriate for very low pressure levels; Especially when the supplied air pressure is low incapable of lifting the applied load this can be express mathematically as: Psa = W/Pd were W = Psa x Pd W = weight/load Pd = downwards pressure Psa = supplied air pressure Therefore applied load/weight is directly proportional to the obtainable pressure gauge calibration meter readings. Sources of Errors: Â · Possible air leakage from the valves. Â · Error due to parallax when reading the half way level mark. Â · Possible pushing down on the piston while spinning the weight. Â · Possible loss of pressure in the piston hydraulics. REFERENCE 1. N. E. Connor, Gas Quality Measuring Devices on Gas Measurement University of Salford, 1969 2. DH- Budenberg, An-Introduction-to-Dead-Weight-Testers @ http://www.scribd.com/doc/18933664 (25th Nov, 2009) 3. Wikipedia Encyclopaedia (www.wikipedia.com) 4. Practical Manual on pressure gauge calibration, 2009.

Play Response

It's A Wonderful Life On Saturday November 19, 201 I went to Cookeville Children's Theatre school performance to watch the show â€Å" It's A Wonderful Life† and it was the last show for this play. This show also has been showed on November 11, 12, 13 15, 17, 18, 19. This play is has a good story. I went to watch the play with two of my friends and other classmates. We went there at 7:30 p. m. at first we could not find the Cookeville Children's Theatre school performance because I have not been there before. With a little help from other friends we found the place.This play was $10 for adults $8 for seniors,students, and children. However, while we were waiting for the play to get started, a staff gets up and gives us a little guide about the play. The Play From childhood, George's greatest ambition has been to see the world, to become an architect and design bridges and skyscrapers everywhere. However, George repeatedly has to sacrifice his dreams. He puts off going to colle ge until Harry graduates from high school to take over the family business, the Bailey Building and Loan Association, essential to many of the disadvantaged in Bedford Falls.But on Harry's graduation night, as George discusses his future with his date Mary Hatch who has had a crush on him since she was a little girl, although George either doesn't realize it or believe it, and tries to remain emotionally detached his father suddenly has a stroke and dies. Mr. Potter , the owner of most of the town, seizes the opportunity to gain control of the Board of Directors and decides to end the â€Å"sentimental hogwash† of home loans for the working poor. George persuades the board members to stop Potter; they agree, but only on condition that George himself run the business. The Music and ChoreographyIn the It’s a Wonderful Life play. The lines of the show are faithfully adapted from the original 1946 movie version and the songs are seamlessly woven in. The score is challengin g musically- and these actors have the range to deliver. â€Å"The ballads shed light on the characters’ feelings behind the dialogue seen in the movie. And the range of emotion is not simply shown by the lyrics in the songs, but by the musicality of the score as a whole. The music for this show is not an afterthought to the famous plot line. It truly is beautiful and rich. Hearing young actors, some of them singing for the first time on stage, is a magical experience.Young voices being grown and blossoming right before your eyes- it represents art in every facet. Conclusion Overall, I really liked the play and the way the actors and the director existing this play. Honestly , when I first planed to go to the play I thought I would stay there for only 15 or 20 minutes at most, but after I watched the first scene I enjoyed it and thought I would watch only the next one then I will leave which I did not until the play was done. I had watch the whole play and did not even feel the play was uninterested . It was an enjoyable play.

Two Poems of Emily Dickinson and Mary Oliver

Comparison and Contrast Essay between two Poems of Emily Dickinson and Mary Oliver Emily Elizabeth Dickinson, or called Emily Dickinson for short (1830 – 1886) and Mary Oliver (1935), are the two poets who contributed great works of art to American society during the late nineteenth and early twentieth century. In spite of several characteristics that can be found in both Emily Dickinson and Mary Oliver poems, there are undeniably things that distinguish them from one another, although outside both are very famous poets of the poems that they wrote at that time, but actually inside, every poem that they bring the reader has a different meaning and quite deep in reader hearts. For example, as we read the poem â€Å"Alligator Poem† by Mary Oliver poem and the poem â€Å"A Bird Came down the Walk† by Emily Dickinson, we can clearly see that both poets have borrowed the images of the bird to express the deeply of each verse, and to add lively for their poem. This method is called personification, is one of the main methods by which the poet used to write a poem vividly. Although both poets use personification methods in both poems, such as borrowing the images of the bird to write a poem as an example, but actually the use of such methods have different deeply meaning in the two poems. And that is the topic I write this essay, what are the similarities and differences between how they use images of birds to express their verses? How they have been very successful in using the personification methods to write a poem completely and deeply. First of all, about two poets, they are very famous poet and professional in the field of modern poems in the late nineteenth and early twentieth century, both began writing poetry when they were very young. (Write something about Emily Dickinson Early Life and Career). Mary Oliver, since she started writing about modern poetry, she had a lot of work that very successful and famous all over the world such as House of Light, Winter Hours: Prose, Prose Poems, and Poems, Why I Wake Early,†¦ and and many other works. One of the most famous works is New and Selected Poems – Volumne One, this work brought to her a great success on the modern way of writing poems, it was also the cause of the birth New and Selected Poems – Volume Two. (Write something about Famous Works of Emily Dickinson). In the poem â€Å"Aligator Poem† in â€Å"New and Selected Poems – Volumne One† of Mary Oliver, personification method is a main method that she used the most to write this poem. As you read the whole poem, you can clearly see the bird that she wants to talk about is tanding in the tops of the trees, whistling any warning, crashing toward to her, its tail failing, slashing the grass, its cradle – shaped mouth gaping, then rimming with teeth,†¦ these actions are not the actions of a bird, these are human actions, she used personification to pretend the bird is a person, or a friend, she pretended that she was walking on the street and saw the bird, but she thought that bird is not a normal bird because she could see its eye was trying to tell her something. And of course she couldn't understand bird language, or the bird couldn't tell her what is going on with her in human language. So the only way that the bird could do is action, I do agree that human cannot understand the birds language, but I do surely agree that human can understand the bird action. Then finally she did understand what the bird was trying to tell her, she understood that something is really bad will happen to her in the future. And yes, she fell, but thanks to the bird's warning, she leaped aside and fell, that is why she did not die. Then in the end, she said that this is not a poem about foolishness, but about how she rose from the ground and saw the world as if for the second time which means she is not a person accepts to failure, she will face it and will continue to stand up every time she falls. In other words, all those things above, including her imagination of a bird is a human, are a method to help she continue to stand up each failure, and see the world again. On the other hand, in the poem â€Å"A Bird Came down the Walk† of Emily Dickinson, personification method is also one of the methods that Emily Dickinson used the most to write this poem like I said above in the instruction and in the poem â€Å"Aligator Poem†, this is also the similarity of the two poems, borrowing the images of bird to express their poems. She describes the simple experience of watching a bird came down the walk, but particularly is the bird didn't aware that it was being watched by the poet. The poet depicts the bird and its actions throughout the whole poem such as hopped sidewise to the wall to let a beetle pass, glanced with rapid eyes, stirred his velvet head, unrolled his feathers, rowed him softer home,†¦ these actions provides the readers with vivid imagery when they read the poetry because Emily Dickinson was very meticulous to describe the bird's actions as the actions of human. The poem makes the reader feel and experience very slowly the simple aspects of nature but very beautiful. She creates the mood of the poem in the sequence of very simple activities of he bird but bring more excitement to the reader. The first three stanzas describe very reasonable to replace the sequence of operations of a bird that could occur in the order when watching many kinds of bird. The last two stanzas describe a very natural act of a bird when she provided a crumb. The poem is divided into two parts, the first three stanzas are the first part to describe the mood and tone of the poem by listing the activities of the bird and the rest of the poetry is the second part describes the effect of human interaction on the bird. In the final stanza, a method that Emily Dickinson was used to write this poem is metaphor method; this is a difference between the two poems of Emily Dickinson and Mary Oliver, comparing the bird’s smoothness in flight to oars splitting the ocean and butterflies leaping from banks. She used metaphor method to compare the bird’s smoothness in flight to oars splitting the ocean and butterflies leaping from banks. After all, the main goal of this poem is to show the simplistic beauty of nature through words, but this scene will be lost forever if people continue to destroy the nature such as the effect of human interaction on the bird as an example in this poem. To sum of, the big difference between the two poems is the meaning of borrowing the images of birds to tell the unbeaten in the poem â€Å"Poem Aligator† and to describe the beauty of nature in the poem â€Å"A Bird Came down the Walk†. In conclusion, reading the poems of the two great poets Emily Dickinson and Mary Oliver is one of the best ways to learn and study knowledge although both poets have similar ideas and different ways to bring knowledge to the reader through words, as long as a person or a student willing to work hard and improve, he/she will be able to analyze things in life, to know how to overcome their own difficulties.

Management Style in Nigeria - 2580 Words

TABLE OF CONTENTS 1. INTRODUCTION 2. AUTOCRATIC OR AUTHORITARIAN MANAGEMENT STYLE a. Advantages of Autocratic Management b. Disadvantages of Autocratic Management 3. DEMOCRATIC OR PARTICIPATORY MANAGEMENT a. Advantages of Democratic Management b. Disadvantages of Democratic Management 4. LAISSEZ FAIRE MANAGEMENT a. Advantages of Laissez Faire Management b. Disadvantages of Laissez Faire Management 5. MANAGEMENT STYLE OF THE NIGERIAN GOVERNMENT 6. MANAGEMENT STYLE IN THE BUSINESS ENVIRONMENT a. the role of a manager b. approach to change c. approach to time and priorities d. decision making e. boss or team player? f. communication and negotiation styles INTRODUCTION What is management style? Management style refers to the way a superior†¦show more content†¦Making the staff feel valued can increasing morale and productivity. Disadvantages of Democratic Management If a vote or meeting takes place when every major decision has to be made, the whole process can take a long time. Management may struggle if asked to take quick and decisive action, something an autocratic manager would strive under. The decided decisions may not be in the company’s best interest, because they are decided upon by the majority, with the majority being the workers, decisions could lean towards their best interests and not the company’s. LAISSEZ FAIRE MANAGEMENT In Laissez Faire management, the manager takes a back seat in proceedings, leaving the staff in charge of their own specific sections or tasks. This allows the employees to stamp their own creative freedom and ideas on the company; the manager will not interfere and will not get involved. The laissez faire style leaves a great deal of responsibility and creativity in the hands of the workers, which is why it’s so important to get the right team together, not everyone can work under a laissez-faire manager who sets a task then leaves the staff to do the rest. The laissez faire manager is looked upon as more of a coach or advisor than a stereotypical manager. Advantages of Laissez Faire Management Laissez-faire management leaves a lot of responsibility in the hands of the workers, this can lead to improved morale, the staff will feel valuedShow MoreRelatedConflict Management Styles Among Corporate Ceos Nigeria1430 Words   |  6 Pagesframeworks used, and identifying which frame work best applies to the topic: â€Å"Conflict Management Styles among Corporate CEO’s in Nigeria†. Also the extract below introduces the theory of â€Å"conflict management† thus describing the conceptual perspectives that informs the different forms behavior by which conflict may be handled. Conflict management Rahim and Bonoma (1979) researched and separated the styles of managing conflict. 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