The Reciprocating Pump Engineering Essay

The Reciprocating Pump Engineering Essay A pump is a mechanical device which helps to move fluids including liquids or gases. It is basically a hydraulic machine which converts the mechanical energy to the hydraulic energy. The hydraulic energy is been present in form of the pressure energy. There are various types of pumps such as positive displacement pumps, velocity pumps, Buoyancy pumps, Impulse pumps. The various different pumps are also been sub-classified in various other pumps. Positive Displacement pumps are one of the most commonly used pumps. They are sub-divided in to Reciprocating and Rotary pumps. Typical types of the Reciprocating pumps are Plunger pumps and Diaphragm Pumps. The Plunger pump is also known as Piston Pumps. The Reciprocating Pumps are highly efficient pumps which are even suitable for the very high heads at low flows. It is a self priming type of pump as it can draw the fluid from the level below the suction flange if the suction pipe is not evacuated. There should be a smooth flow required for achieving a good efficiency (Chinnuraj, 2009). The complete system is based on the design of the pump. The head of cylinder is been mounted with suction and discharge valves. The fluid enters the pump through the suction valve and goes out threw the discharge valve. In suction stroke, suction valve opens when the plunger retracts. The liquid gets pushes out of the discharge valve in the forward stroke. Reciprocating system has a pulsating discharge and it totally depend on the speed of the pump which can be easily altered. The intake of the fluid in the pump is always at a constant volume. They are often used for slurry and sludge. There are various different designs from rest of the pumps. The design containing single-acting motion discharges fluid from only one side of the piston. There is only one suction and discharge per revolution of the crank shaft. The other design is the double-acting piston design where the suction and the discharge occurs on the either side of the piston resulting in double suction and double discharge per revolution of crack shaft. Classification of PD Pump Positive Displacement pump are been classified as follows: Positive Displacement Pump Rotary Pump Single Rotor -Vane -Piston -Flexible -Member Screw -Simplex -Duplex -Triplex -Multiplex -Simplex -Duplex Double Acting Single Acting Diaphragm Piston Plunger Reciprocating Pump Simplex Multiplex Multi Rotor -Gear Lobe Circumferential Piston -Screw (Gates, 2010) Working Principle of Reciprocating Pump The working principle of the Reciprocating pump is very simple; it operates on the principle that a volume of liquid would be displaced by solid equal to its own volume. The mechanical energy is been converted in to the pressure energy and takes place due to the suction of the liquid into the cylinder in which the piston is having a reciprocating motion (linear motion-threw and fore). This exerts the thrust on the fluid and hydraulic energy gets increased gradually. In single acting reciprocating pumps, a single piston moves forward and backward in a closed tight cylinder. The linear motion of the piston in the cylinder is been given by connecting piston to the crank with the help of a connecting rod. An electric motor is been used to give motion to the crank and the rotary motion is been converted to the linear motion by the help of the connecting rod. The working principle is somewhat similar to the car engines where the piston has the same movement threw some similar kind of motio ns. In Reciprocating Pump, the suction valve allows the fluid to enter where as the discharge valve tends to discharge it from the cylinder (Chinnuraj, 2009). http://www.lcresources.com/resources/getstart/pump.gif Fig 01: Working Principle of Reciprocating Pump (Getting Started in HPLC, 2001) Types of Reciprocating Pumps The Reciprocating Pumps are usually classified as follows: Direct or Indirect acting Simplex (single) or duplex (double) Single   acting   or   double   acting High pressure or low pressure The direct acting pumps are one of the most common type of pump been used. It is been known so as in the particular design the pump rod is a direct extension of the piston rod in which the lower end is been directly connected to the piston in the cylinder. Single and Double action pumps is as mentioned earlier. Single action has a single suction and a single discharge per revolution and Double action pump has two suctions and discharges per revolution. Applications Reciprocating Pumps have a very large contribution to the society with plenty of uses. They are been used for no. of small and large applications including irrigation, chemical movement, sewage movement, flood control and marine applications and even many more. Designing factors like size and type of pump depends on the usage. They are been used in various purposes such as: High pressure jets: The purpose of pumps used is producing a direct high jet pressure of the fluid. The inlet flow is at a constant flow and pressure but the discharge at a high velocity and therefore results to high amount of pressure. Chemical Injection: The Reciprocating Pumps are even used in the chemical industry where they need to inject the chemical in a certain flow or pressure. It is been used at very high precise and accuracy Irrigation: The pump is usually used in farms and gardens to distribute water throughout equally and automatically without any sort of manual efforts. Sewage movement: The pump are been used to move the slurry or sewage material in a very easy and automatic way. The main advantage is the time constraint. It takes very less time as well as it is very cheap compared to other techniques. Marine application: The vast amount of usage is being the marine sector where they need to use water movement from one part to other through a pump. The pump is very easy and compact source of product which can be installed very easily and without any maintenance in future. In marine field pump is used for: Lubricating oil transfer Fuel oil transfer Auxiliary circulating and condensate. Domestic uses: Reciprocating pump is even used as domestic purposes. In olden days it was very common to use a hand pump which was a type of reciprocating pump with help of which we can pull the underground water for various purposes such as home usage, irrigation, construction, small scale industry and many more. Discharge and Pressure Characteristics The working principle and the characteristic is been keenly observed earlier. It is been very easy to analyse the discharge and pressure constraints of reciprocating pumps. The discharge of the reciprocating pump is not uniform and stable. The discharge characteristic depends on: Head flow of fluid Fluid density Speed of reciprocating piston Pump size and design The discharge is completely non-uniform and throttling. The pulsating property of the discharge fluid is seen. This is because the piston moves at a high velocity hitting the fluid out wards and the hitting of the piston is not a continuous act which can give a uniform pressure outlet. Despite of vital use, the reciprocating pump still encounter pulsating pressure which is been seen at the suction and discharge lines. This pulsating feature is result of the interaction between unstable flow of fluid and the dynamic characteristics of the fluid particles. Pressure pulsating in the suction line can lead to the cavitation, either in the line itself or in the cylinder chamber. If cavitation is been experienced at the start of the piston stroke than the piston loading and the crank assembly can fail. Because of all this factors it reduces the life of the pump and also affects the safety conditions (K A Edge, 1997) Pump Performance and Efficiency The head of flow against which the pump works is called total head, H. The total head of the pump is the energy imparted to the liquid by the pump. H = hd hg Therefore, the effective head of a pump is expressed by the following equation: H = Equation 1 (Sorensen, 1969) This design principle of the pump work similarly as that of the turbines. The energy of supplied to the pump by the rotating shaft to move the piston inside the cylinder, in terms of bhp: Energy, e = = The capacity of the pump is proportional to its displacement per unit time, D. Assuming 100% of the hydraulic efficiency of the pump, the displacement of the pump is calculated. The displacement is the calculated capacity of pump which is proportional to: Cross-sectional area of piston, A Length of the stroke, S No. of cylinders, n Pump speed in rpm (gallons per minute) D = (A ÃÆ'- S ÃÆ'- n ÃÆ'- rpm) / 231 In case of double acting pumps, the cross sectional area is twice to be taken in to account from which the cross sectional area of piston rod (a) is subtracted. In double acting pumps, D = ((2A a) ÃÆ'- S ÃÆ'- n ÃÆ'- rpm) / 231 The volumetric efficiency of the pump is expresses in terms of percentage. It is directly proportional to the ratio of the total discharge volume to piston displacement. The ratio (r) is equal to (c + d)/d where: D = volume displaced by piston C = Additional volume between the discharge and suction valves. So it is clearly seen that smaller the ratio, the volumetric efficiency is tend to be better. Mathematically it is expressed as: VE = 1 (P ÃÆ'- b ÃÆ'- r ) S Where P is pressure B is the liquid compressibility factor R is volume ratio S is the slip. (Joe Evans, 2004) Losses in Reciprocating Pump There are various losses which are been encountered in the pump such as: Frictional losses Head losses Heat transfer losses The various losses occur due to the friction and the movement of the fluid. It depends on the head flow of fluid, density of the fluid, piston speed and the fluid suction capacity as well as discharge. There are lots of constraints been involved here, but it simply can be minimised but not 100% avoided. Advantages Easy in working Inexpensive Compact and Easy to install Low maintenance Works at high speed and at low power Disadvantages The major disadvantage of the reciprocating pump is that it has a discontinuous discharge flow which with variable pressure and hence it adversely affects the potential of the pump usage. There are various techniques been used to minimise the pulsating feature but it still tend to create problems. There are some technical ways used to minimise it by using sensors or throttle valves which keeps the discharge pressure uniform, but it does affect the overall flow and creates a kind of friction to the overall discharge pressure. Secondly, it has a disadvantage that it is prone to flow separation at the lowest pressure point in the system. The design of the system is such that this problem would be there and cannot be solved. The various different tries and practical experiments to minimise it would not work till the design is not thoroughly changed. In spite of all this disadvantages it is still a very useful product and widely used.

If the Coat Fits Wear It Essay

The Oceanic Corporation, a Chesapeake, VA based company, was established in 1994. Glenn Rodgers III founded the corporation, which was privately owned at the time, after his retirement from Norentech Corporation. The Oceanic Corporation was originally formed to provide ship repair services and quickly earned a Department of Defense (DOD) certified Alteration Boat Repair (ABR) designation. Among its specialties were structural welding, piping system installation and repairs, electrical, painting, rigging, machinery and dry-lock work, as well as custom sheet metal fabrication. Other divisions of The Oceanic included Habitability Installation, Industrial Contracting, and Alteration/Installation Teams (AIT). With its initial success and good return on investment the firm opened and operated facilities in California, New Jersey, Florida, Maryland, Pennsylvania and Washington. In 1998, the company went public and its initial public offering was very successful. The stock price had risen from its initial value of $10 to its current level of $35 per share. There were currently 5 million shares outstanding. In 1999, the company issued 30-year bonds at par, with a face value of $1000 and a coupon rate of 10% per year, and managed to raise $40 million for expansion. Currently, the AA-rated bonds had 25 years left until maturity and were being quoted at 91.5% of par. Over the past year, the Oceanic Corporation utilized a new method for fabricating composite materials that the firm’s engineers had developed. In June of last year, management established the Advanced Materials Group (AM Group), which was dedicated to pursuing this technology. The firm recruited Larry Stone, a senior engineer, to head the AM Group. Larry also had an MBA from a prestigious university under his belt. Upon joining Oceanic, Larry realized that most projects were being approved on a â€Å"gut feel† approach. There were no formal acceptance criteria in place. Up until then, the company had been lucky in that most of its projects had been well selected and it had benefited from good relationships with clients and suppliers. â€Å"This has to change,† said Larry to his assistant Stephanie, â€Å"we can’t possibly be this lucky forever. We need to calculate the firm’s hurdle rate and use it in the future.† Stephanie Phillips, who had great admiration for the boss, replied, â€Å"Yes, Larry, why don’t I crunch the numbers and give them to you within the next couple of days?† â€Å"That sounds great, Stephanie,† said Larry. â€Å"My years of experience tell me that when it comes to the hurdle rate for new projects, one size hardly ever fits it all!† As Stephanie began looking at the financial statements, she realized that she was going to make some assumptions. First, she assumed that she assumed that the new debt would cost about the same as the yield on outstanding debt and would have the same rating. Second, she assumed that the firm would continue raising capital for future projects by using the same target proportions as determined by the book values of debt and equity (see Table 1 for recent balance sheet). Third, she assumed that the equity beta (1.5) would be the same for all the divisions. Fourth, she assumed that the growth rates of earnings and dividends would continue at their historical rate (see Table 2, for earnings and dividend history). Fifth, she assumed that the corporate tax rate would be 34% and finally, she assumed that the flotation cost for debt would be 5% of the issue price and that for equity would be 10% of selling price. The 1-year Treasury bill yield was 4% and the expected rate of return on the market portfolio was 10%.

A passion for practicing medicine in Developing Country

A life with purpose is a life without misery. While yet many choose purpose out of a mere likeness, I have chosen mine out of interest, vision and passion. To live beyond a committed life in the world of medicine is my focal point. Yes, an opportunity to live a noble future that reflects constantly on the healing assignment, making people appreciate the privilege of breath.Of more interest of course, is the agendum to study medicine.A worthwhile career to contribute to life, making the world a better place to live. Health is wealth, so says a common saying. The study of health hence is the study of wealth. I am quite positive that my interest dwells in the study of medicine not only for a mere need to able to treat the ill ones, but a mission to spread the awareness of the need of good living and good health to all and sundry.Awareness that many of human ways bring about many diseases. Very few is aware that there are many more lethal diseases than AIDS (Acquired Immune Deficiency Sy ndrome).Diseases like Bird flu, Cancer, Leukemia, SARS, to mention but few, are relatively unaddressed by many.Another issue that needs attention is the nutritional intake of human. Good nutrient does not only strengthen the body system, it also allows the body to resist some diseases. In the developed world, many eat and overfeed yet without taking the necessary nutrient. While in the developing countries, the case is more severe.The reason is not unconnected to the fact that they have shortage of food, hence shortage of nutrient necessary for good health. If only there could be more seminars, campaigns, and other media of awareness creation, many could have been saved from many diseases.I will like to join the presently available campaign teams across the world. Bodies like WHO (World Health Organization), USAID and lot more are doing a great job in sensitizing the entire globe on several health issues. Better still, if given all I require, I will like to create a new body that wi ll focus on the developing countries. The Old and the young in the developing countries go through so much concerning their health.Unaware of repercussions of many of their ways, hence leading to many diseases.They are locked up in a vicious circle of ill-health simply because of their poverty which does not afford them good health care. Countries like Somalia, Angola, Nigeria, to mention only but few among others, they need face lift in their attitudes towards their health schemes. Many children die of malaria or typhoid and yet many crippled by polio. These are diseases that could be cured or prevented with just a vaccination or some other simple drugs as the case may be.Of more focus is the old, weak and fragile both physically and emotionally. They suffer dissertation and low appetite. Their psychological status is assumed defective; they feel an aura of rejection. The chewing skill is increased but without enhancement, for their teeth become weak like cotton.Of more concern to me are the aged ones in the developing country, where the government of the masses cares less for the aged ones. Retired with little or no pension, living a practical vicious circle of no income, no health. I wish I could grow up in skill and knowledge in medicine vastly to help these people crying out everyday.For long, I have watched mentors making things happen in the world of health; it is high time I joined the train and contributed my own quota, lest it will be late.

Martin Luther King Jr - 1395 Words

Dr. Martin Luther King Jr Martin Luther King Jr. was a revolutionary man. He spoke of non-violent ways to create a fair and equal society. He preached that all men are the same and created equal no matter the color of your skin. He was a great public speaker and reached many people in his speeches. Martin King even got to speak to thousands of people at the footsteps of the Lincoln Memorial where he spoke these words. I have a dream that my four little children will one day live in a nation where they will not be judged by the color of their skin, but by the content of their character. The first four words of this quote are the most repeated words and in my opinion the most meaningful as well.†¦show more content†¦Nixon who was head of the local NAACP chapter met with Martin King and other civil rights leaders planned a city wide bus boycott. Martin would be nominated head of this boycott and it would be 328 days of walking to work, harassment, violence, and intimidation for the Montgomery African Am erican Community. During this boycott both Nixon and Kings Homes were bombed. It was very hard for King to continue the boycott but he did and eventually the city of Montgomery lifted the law that mandated segregated public transportation. Flush with victory, African Civil Rights leaders recognized a need for a national organization to coordinate their efforts. In January of 1957 Martin and many other ministers and Civil Rights Activist founded the Southern Christian Leadership Conference. They would help conduct non-violent protesting to promote civil rights and equality among all. King met with religious civil rights leaders and lectured all over the country on race related issues. By around 1960 Martin Luther King Jr. was going national. He then returned to Atlanta to become a co-pastor to his father at the original Baptist Church. In October at 1960 King and 36 other students were arrested after not leaving a counter after being denied lunch. This was only one of many arrest of King. Shortly after this arrest King was actually imprisoned for a traffic conviction. After this harsh treatment President KennedyShow MoreRelatedMartin Luther King Jr.867 Words   |  4 Pagespeople, one of them is Martin Luther King Jr. He made the world a better place for black citizens by doing non-violence movements and marched the way to freedom. Martin Luther King Jr. was born on January 15, 1929, in Atlanta Georgia as Michael King Jr., but changed his name to Martin Luther King Jr. in honor of Protestant Martin Luther. Through his activism, King played a pivotal role in ending the legal discrimination of African American citizens. 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