CareersPlusResumes.com - Poor service/arrogance/scam |
| 2009-08-16 04:45:57 by Xoli
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Like many people out there, I am looking for a job and after several months of unsuccessfully job applications, I decided that few hundred dollars paid to a professional resume writer could pay bigger dividends and land me few interviews. I searched the internet and decided to go with CareersPlusResumes.com which was by no mean amongst the cheapest options.
They have a great website and listed the Wall Street Journal as one of their partners, so I thought that it was a legitimate professional company and decided to buy a $149.90 package for: One-on-one consultation+ Resume writing + Cover letter. They promise you a 24-48 hours turnaround time, so I was expecting to get a call from the consultant to discuss my background and my career expectation, but I was shocked to receive a resume after a 2-day wait which had exactly the same wordings and text as my old resume that I had e-mailed them initially. The only difference was on the executive summary and the format. When I raised the issue, the gentlemen called Kevin (this person seems to be the only guy running this so called business-a scam- because he is the person that you will always get on the phone when you are so lucky to get through any of the numbers listed on their website) tells me that my job experience is always the same and cannot be changed from my former resume. My point is that my old 2 page resume does not capture the full depth and breath of my work experience and I paid for this service because I thought that a one-on-one interview with a consultant would enable him to understand my profile and how to market it better in a new resume:I did not pay $149.99 for something that I could easily have done myself.
Anyway they have taken my money and sent me nothing but my very same old resume and worst I still do not received the cover letter that was suppose to come with it.
Do yourself a favor and stay away from this scam… I wish somebody had warned me before I used them. |
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A boiler is a closed vessel in which drinking water or other fluid is heated. The liquid does not always boil. (In THE UNITED STATES, the word "furnace" is normally used if the purpose is not to boil the liquid.) The warmed or vaporized fluid exits the boiler for use in a variety of heating or processes applications,[1 - [2 - including water heating, central heating system, boiler-based power generation, food preparation, and sanitation.
Materials
The pressure vessel of the boiler is usually manufactured from steel (or alloy steel), or historically of wrought iron. Stainless steel, of the austenitic types especially, is not found in wetted parts of boilers thanks to stress and corrosion corrosion cracking.[3 - However, ferritic stainless steel is often used in superheater sections that will not be exposed to boiling water, and electrically heated stainless steel shell boilers are allowed under the Western european "Pressure Equipment Directive" for production of steam for sterilizers and disinfectors.[4 -
https://en.wikipedia.org/wiki/Boiler - https://en.wikipedia.org/wiki/Boiler
In live steam models, copper or brass is often used because it is easier fabricated in smaller size boilers. Historically, copper was often used for fireboxes (especially for steam locomotives), because of its better formability and higher thermal conductivity; however, in newer times, the high price of copper often makes this an uneconomic choice and cheaper substitutes (such as steel) are used instead.
For much of the Victorian "age group of steam", the only materials used for boilermaking was the highest grade of wrought iron, with assembly by rivetting. This iron was often extracted from specialist ironworks, such as at Cleator Moor (UK), noted for the high quality of their rolled plate and its suitability for high-reliability use in critical applications, such as high-pressure boilers. In the 20th century, design practice moved towards the use of steel instead, which is more powerful and cheaper, with welded construction, which is quicker and requires less labour. It should be mentioned, however, that wrought iron boilers corrode significantly slower than their modern-day steel counterparts, and are less vunerable to localized stress-corrosion and pitting. This makes the longevity of older wrought-iron boilers far superior to those of welded steel boilers.
Cast iron may be used for the heating vessel of domestic water heaters. Although such heaters are usually termed "boilers" in some countries, their purpose is usually to produce hot water, not steam, and so they run at low pressure and stay away from boiling. The brittleness of cast iron helps it be impractical for high-pressure steam boilers.
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Energy
The foundation of heat for a boiler is combustion of some of several fuels, such as wood, coal, oil, or natural gas. Electric vapor boilers use resistance- or immersion-type heating system elements. Nuclear fission is utilized as a heat source for producing steam also, either directly (BWR) or, in most cases, in specialised temperature exchangers called "steam generators" (PWR). Warmth recovery vapor generators (HRSGs) use the heat rejected from other procedures such as gas turbine.
Boiler efficiency
there are two methods to gauge the boiler efficiency 1) direct method 2) indirect method
Immediate method -direct method of boiler efficiency test is more functional or even more common
boiler efficiency =Q*((Hg-Hf)/q)*(GCV *100 ) Q =Total vapor stream Hg= Enthalpy of saturated vapor in k cal/kg Hf =Enthalpy of feed drinking water in kcal/kg q= quantity of gasoline use in kg/hr GCV =gross calorific value in kcal/kg like family pet coke (8200 kcal/KG)
indirect method -to measure the boiler efficiency in indirect method, we are in need of a following parameter like
Ultimate analysis of energy (H2,S2,S,C moisture constraint, ash constraint)
percentage of O2 or CO2 at flue gas
flue gas temperature at outlet
ambient temperature in deg c and humidity of air in kg/kg
GCV of fuel in kcal/kg
ash percentage in combustible fuel
GCV of ash in kcal/kg
Configurations
Boilers can be classified into the following configurations:
Pot boiler or Haycock boiler/Haystack boiler: a primitive "kettle" where a fireplace heats a partially filled drinking water pot from below. 18th century Haycock boilers produced and stored large quantities of very low-pressure vapor generally, often hardly above that of the atmosphere. These could burn off wood or most often, coal. Efficiency was very low.
Flued boiler with one or two large flues-an early type or forerunner of fire-tube boiler.
Diagram of a fire-tube boiler
Fire-tube boiler: Here, drinking water partially fills a boiler barrel with a little volume left above to support the steam (steam space). This is the kind of boiler used in all steam locomotives nearly. The heat source is in the furnace or firebox that has to be held completely surrounded by water in order to keep the temp of the heating surface below the boiling point. The furnace can be situated at one end of the fire-tube which lengthens the road of the hot gases, thus augmenting the heating surface which may be further increased by causing the gases reverse direction through a second parallel tube or a bundle of multiple tubes (two-pass or come back flue boiler); additionally the gases may be studied along the sides and then beneath the boiler through flues (3-pass boiler). In case of a locomotive-type boiler, a boiler barrel extends from the firebox and the hot gases go through a lot of money of fire tubes inside the barrel which greatly escalates the heating surface in comparison to a single tube and further improves heat transfer. Fire-tube boilers usually have a comparatively low rate of vapor creation, but high vapor storage capacity. Fire-tube boilers mainly burn off solid fuels, but are readily adaptable to the people of the gas or liquid variety.
Diagram of the water-tube boiler.
Water-tube boiler: In this type, tubes filled up with drinking water are arranged in the furnace in a genuine variety of possible configurations. Water pipes connect large drums Often, the low ones containing water and the upper ones water and steam; in other cases, such as a mono-tube boiler, drinking water is circulated by a pump through a succession of coils. This kind generally provides high steam production rates, but less storage space capacity than the above. Water pipe boilers can be designed to exploit any warmth source and tend to be preferred in high-pressure applications since the high-pressure drinking water/vapor is contained within small size pipes which can withstand the pressure with a thinner wall structure.
Flash boiler: A flash boiler is a specialized kind of water-tube boiler in which pipes are close jointly and drinking water is pumped through them. A flash boiler differs from the kind of mono-tube vapor generator where the pipe is permanently filled with water. In a flash boiler, the tube is held so hot that the water give food to is quickly flashed into vapor and superheated. Flash boilers acquired some use in automobiles in the 19th century which use continued in to the early 20th century. .
1950s design vapor locomotive boiler, from a Victorian Railways J class
Fire-tube boiler with Water-tube firebox. Sometimes the two above types have been combined in the next manner: the firebox includes an assembly of water tubes, called thermic siphons. The gases go through a typical firetube boiler then. Water-tube fireboxes were installed in many Hungarian locomotives,[citation needed - but have fulfilled with little success far away.
Sectional boiler. Inside a solid iron sectional boiler, sometimes called a "pork chop boiler" the water is contained inside solid iron sections.[citation needed - These areas are assembled on site to produce the finished boiler.
Safety
See also: Boiler explosion
To define and secure boilers safely, some professional specialized organizations such as the American Society of Mechanical Engineers (ASME) develop specifications and regulation rules. For instance, the ASME Boiler and Pressure Vessel Code is a standard providing an array of guidelines and directives to ensure compliance of the boilers and other pressure vessels with basic safety, security and design standards.[5 -
Historically, boilers were a source of many serious injuries and property destruction due to badly understood engineering principles. Thin and brittle metallic shells can rupture, while poorly welded or riveted seams could open up, resulting in a violent eruption of the pressurized steam. When drinking water is changed into steam it expands to over 1,000 times its original quantity and moves down vapor pipes at over 100 kilometres each hour. Because of this, steam is a superb way of moving energy and heat around a niche site from a central boiler house to where it is necessary, but without the right boiler give food to water treatment, a steam-raising flower will suffer from size corrosion and formation. At best, this raises energy costs and can lead to poor quality vapor, reduced efficiency, shorter plant life and unreliable operation. At worst, it can result in catastrophic loss and failing of life. Collapsed or dislodged boiler tubes can also aerosol scalding-hot steam and smoke from the air intake and firing chute, injuring the firemen who insert the coal in to the fire chamber. Extremely large boilers providing a huge selection of horsepower to operate factories could demolish entire structures.[6 -
A boiler that has a loss of feed drinking water and is permitted to boil dry out can be extremely dangerous. If supply drinking water is then sent into the bare boiler, the tiny cascade of inbound drinking water instantly boils on connection with the superheated steel shell and leads to a violent explosion that can't be managed even by protection steam valves. Draining of the boiler can also happen if a leak occurs in the steam source lines that is larger than the make-up water source could replace. The Hartford Loop was developed in 1919 by the Hartford Vapor Boiler and INSURANCE PROVIDER as a strategy to help prevent this condition from occurring, and therefore reduce their insurance statements.[7 - [8 -
Superheated steam boiler
A superheated boiler on the steam locomotive.
Main article: Superheater
Most boilers produce vapor to be used at saturation heat range; that is, saturated steam. Superheated steam boilers vaporize water and then further heat the steam in a superheater. This provides vapor at higher temperatures, but can decrease the overall thermal efficiency of the vapor generating seed because the bigger steam temperature takes a higher flue gas exhaust temperature.[citation needed - There are several ways to circumvent this problem, typically by giving an economizer that heats the give food to water, a combustion air heating unit in the hot flue gas exhaust path, or both. You can find benefits to superheated vapor that may, and will often, increase overall efficiency of both steam generation and its own utilization: gains in input temperatures to a turbine should outweigh any cost in additional boiler problem and expense. There may also be useful restrictions in using moist vapor, as entrained condensation droplets will damage turbine blades.
Superheated steam presents unique safety concerns because, if any system component fails and allows steam to escape, the temperature and pressure can cause serious, instantaneous harm to anyone in its path. Since the escaping steam will initially be completely superheated vapor, detection can be difficult, although the intense heat and sound from such a leak clearly indicates its presence.
Superheater procedure is similar to that of the coils on an fresh air conditioning unit, although for a different purpose. The steam piping is directed through the flue gas path in the boiler furnace. The heat range in this area is normally between 1,300 and 1,600 °C (2,372 and 2,912 °F). Some superheaters are radiant type; that is, they absorb high temperature by rays. Others are convection type, absorbing temperature from a liquid. Some are a combination of both types. Through either method, the extreme heat in the flue gas path will heat the superheater steam piping and the steam within also. While the temperatures of the vapor in the superheater increases, the pressure of the steam does not and the pressure remains the same as that of the boiler.[9 - Virtually all steam superheater system designs remove droplets entrained in the steam to prevent harm to the turbine blading and associated piping.
Supercritical steam generator
Boiler for a power seed.
Main article: Supercritical steam generator
Supercritical steam generators are used for the production of electric power frequently. They operate at supercritical pressure. As opposed to a "subcritical boiler", a supercritical vapor generator operates at such a higher pressure (over 3,200 psi or 22 MPa) that the physical turbulence that characterizes boiling ceases to occur; the fluid is liquid nor gas but a super-critical fluid neither. There is absolutely no era of vapor bubbles within water, because the pressure is above the critical pressure point of which vapor bubbles can develop. As the liquid expands through the turbine stages, its thermodynamic state drops below the critical point as it can work turning the turbine which turns the electrical generator from which power is eventually extracted. The liquid at that point may be considered a mix of steam and liquid droplets as it passes into the condenser. This leads to less fuel use and for that reason less greenhouse gas production slightly. The word "boiler" shouldn't be used for a supercritical pressure steam generator, as no "boiling" occurs in this product.
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Accessories
Boiler fittings and accessories
Pressuretrols to control the vapor pressure in the boiler. Boilers generally have two or three 3 pressuretrols: a manual-reset pressuretrol, which functions as a safety by setting the top limit of vapor pressure, the operating pressuretrol, which settings when the boiler fires to keep up pressure, and for boilers equipped with a modulating burner, a modulating pressuretrol which settings the quantity of fire.
Basic safety valve: It is utilized to alleviate pressure and stop possible explosion of the boiler.
Water level indicators: They show the operator the level of liquid in the boiler, known as a sight glass also, water measure or water column.
Bottom blowdown valves: They offer a way for removing solid particulates that condense and rest on the bottom of the boiler. As the name implies, this valve is usually located on the bottom of the boiler, and is occasionally opened to use the pressure in the boiler to force these particulates out.
Constant blowdown valve: This enables a small quantity of water to flee continuously. Its purpose is to avoid the water in the boiler becoming saturated with dissolved salts. Saturation would lead to foaming and cause water droplets to be transported over with the vapor - an ailment known as priming. Blowdown is often used to monitor the chemistry of the boiler water also.
Trycock: a type of valve that is often use to manually check a liquid level in a container. Most entirely on a drinking water boiler commonly.
Flash container: High-pressure blowdown enters this vessel where in fact the steam can 'flash' safely and become found in a low-pressure system or be vented to atmosphere while the ambient pressure blowdown flows to drain.
Automatic blowdown/continuous heat recovery system: This technique allows the boiler to blowdown only when makeup water is moving to the boiler, thereby transferring the utmost amount of heat possible from the blowdown to the make-up water. No flash container is normally needed as the blowdown discharged is close to the temperatures of the makeup water.
Hand holes: These are metal plates installed in openings in "header" to allow for inspections & installation of tubes and inspection of internal surfaces.
Steam drum internals, some display screen, scrubber & cans (cyclone separators).
Low-water cutoff: It is a mechanical means (usually a float switch) that is used to turn from the burner or shut down energy to the boiler to avoid it from jogging once the drinking water runs below a certain point. If a boiler is "dry-fired" (burned without drinking water in it) it can cause rupture or catastrophic failure.
Surface blowdown series: It offers a way for removing foam or other light-weight non-condensible chemicals that have a tendency to float on top of water inside the boiler.
Circulating pump: It is made to circulate water back again to the boiler after it has expelled some of its heat.
Feedwater check valve or clack valve: A non-return stop valve in the feedwater line. This can be installed to the medial side of the boiler, just below water level, or to the top of the boiler.[10 -
Top give food to: With this design for feedwater injection, the water is fed to the top of the boiler. This can reduce boiler fatigue caused by thermal stress. By spraying the feedwater over some trays water is quickly heated which can reduce limescale.
Desuperheater tubes or bundles: A series of tubes or bundles of tubes in the water drum or the steam drum designed to cool superheated steam, in order to provide auxiliary equipment that does not need, or may be damaged by, dry out steam.
Chemical injection line: A link with add chemicals for controlling feedwater pH.
Steam accessories
Main vapor stop valve:
Steam traps:
Main steam stop/check valve: It is utilized on multiple boiler installations.
Combustion accessories
Fuel oil system:gasoline oil heaters
Gas system:
Coal system:
Soot blower
Other essential items
Pressure gauges:
Feed pumps:
Fusible plug:
Inspectors test pressure measure attachment:
Name dish:
Registration dish: |
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