Trash Rakes - Advantages of Automated Trash Rack Cleaning

Trash rakes have existed since the first hydroelectric power plants were developed. Used to clean the intake racks that prevent debris from entering the plant, trash raking can be done as either a manual or automated process. While manual cleaning is still commonly used, automated systems are becoming more widely used because of their increased efficiency and lower operational costs.

Challenges in Cleaning Trash Racks

Trash rack cleaning poses many challenges to the operators of hydroelectric plants. As outlined in Civil Works for hydroelectric facilities, published by the American Society of Civil Engineers (ASCE) in 2007, these problems include:

• Siltation, which occurs when twigs, branches and leafy materials are not removed properly, causing an increase of sedimentation on the trash rack.
• Lower efficiency, caused by a damaged raking arm or misaligned trash rake.
• Damaged cables or pulleys.
• Inadequate lifting capacity.
• Inability to reach the bottom of the trash racks. (Hand raking is limited to depths of 6 to 8 feet below the water's surface.)

One of the key solutions suggested in this book, beyond repairing damaged parts, is to upgrade manual operations to an automated system. The book cites an example from the Racine Hydroelectric Project on the Ohio River. It notes the benefits of changing to an automated system: "... it reduced [the] overall operating costs of raking trash, trash disposal, and lost generation."

Design of Automated Trash Rack Cleaning Systems

The book Guidelines for Design of Intakes for Hydroelectric Plants talks about the design of automated trash rakes. There are a couple of designs available:

• A hydraulically driven chain system pulls raking fingers through the trash racks.
• A fully hydraulic arm trash rake consists of a boom that lowers the rake head into the water. In advanced models, a hydraulic cylinder tilts the boom to apply the rake at a constant pressure to ensure thorough cleaning.

Automated trash rakes can handle debris with great efficiency, either by dumping it on the forebay or intake deck, or through a conveyor or trough. Automated raking systems can be initiated based on time or a head differential. A buildup of trash creates an increased differential head across the trash rack; the rake begins operations when a specific level is reached. Automated systems can also be initiated manually by an operator who can watch for certain conditions and trigger the rake when necessary.

The Benefits of Automated Trash Rakes

Automated trash rack cleaning has been proven to improve efficiency and reduce costs. The Racine experiment, cited above, is just one example. In Europe, Verbun upgraded its hydroelectric plants along the Mur River with fully automated systems in 2005. The plants have been unmanned ever since and working very efficiently.

Operator safety is another benefit of automatic systems. Manual trash raking is inherently risky, and automated systems reduce that risk.

Overall, automated trash rakes offer many operational and financial benefits. Evidence of these benefits can be seen in the upgrades being done to hydroelectric plants around the world, and in the ACSE recommendation that upgrades from manual to automatic systems are one of the best ways to overcome the challenges of trash rack cleaning.

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Advantages of a Civil Engineering Course

If you are curious about things and want to build innovations in your life and have love for everything in action, then you must choose civil engineering as your course.

Ten years ago in most of the universities only male students were present in the field of engineering but at present many female students are joining this field. They have developed interest in them for this subject of study due to the fact that they want different careers at the same period.

When a student join civil engineering, he has to learn many features as well like building infrastructure, make the public safe by building safe buildings and many of the others. After graduation, this field is quite vast so you have a lot of career opportunities available.

The career opportunities are not limited for a civil engineer. He is a part of any company and can work for the government projects like construction of roads and buildings etc. If you have acquired education at its best level than you have opportunity of joining Air force as well but keep in mind that compensation is very enticing in this kind of job.

After the completion of civil engineering, most of the engineers lose hope if they won't get any job. They won't have to lose hope because they are not alone as thousands of engineers are graduating every year and competition is quite tough so they just have to increase their skill level.

After joining a civil company, you have to prove your skills to the specialists of the company. If they felt that you have all the skills to do daunting task, very soon it will be your turn and that would the time of your dreams.

At present, more than 300,000 employed civil engineers are working in US only.

There is a need of growth every where in the world when talk about construction, many companies is offering careers to the civil engineers. So they need to utilize this chance and start a successful career.

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Infinite Advantages of Pharmaceutical Engineering

Pharmaceutical engineering is the only substantial wing of science that uses all the ideas and theories of Chemical Engineering. This engineering department mainly handles the progress of highly skill full and good agents that can be used for the improvement of crucial medicines by pharmaceutical manufacturing industries. Improved products commercialization was also taken care by the industries. The vast position of this remarkable emergence of engineering is essence of this article.

This engineering department supports Pharmaceutical graduates to get career opportunities in large number in various regions. These highly talented pharmaceutical experts are loaded with cross-functional skills. They can use all their proficiency and skills in many fields and also can show their talent in all areas. These pharmaceutical students never have job scarcity because they are all in great demand for several regions like biotechnology, biomedical science, food and food additive industries, nanotechnology, nutrition, agriculture, dairy farms, veterinary science, cosmetic industries etc.

The main target of pharmaceutical engineering is to create vital medicines which can be used for all the generic and critical diseases which can also fight successfully. Very often new virus is discovered which has capability to cause irreversible health defects.

To save the people from all these frightening diseases and viruses the pharmaceutical engineers must be aware of all the latest technologies and tools.

This engineering department has improved significantly for all the people by developing vital medicines for all the diseases. So, this engineering department is important and has numerous advantages. This branch of engineering has changed the face of the medical science and has blessed the world with numerous important and effective medicines that can cure almost all the common as well as crucial diseases. The pharmaceutical graduates are still trying hard to free this world from the disastrous clutches of the lethal diseases.

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