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 liquid is heated. The liquid will not necessarily boil. (In North America, the term "furnace" is generally used if the reason is never to boil the fluid.) The heated or vaporized liquid exits the boiler for use in various heating or processes applications,[1 - [2 - including drinking water heating, central heating, boiler-based power generation, cooking food, and sanitation.
Materials
The pressure vessel of the boiler is usually made of steel (or alloy steel), or of wrought iron historically. Stainless steel, of the austenitic types especially, is not used in wetted parts of boilers credited to corrosion and stress corrosion cracking.[3 - However, ferritic stainless is often used in superheater sections that will not come in contact with boiling drinking water, and electrically heated stainless shell boilers are allowed under the Western "Pressure Equipment Directive" for creation 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 since it is more easily fabricated in smaller size boilers. Historically, copper was often used for fireboxes (especially for vapor locomotives), due to 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 a lot of the Victorian "age of vapor", the only material used for boilermaking was the best quality of wrought iron, with set up by rivetting. This iron was often from specialist ironworks, such as at Cleator Moor (UK), mentioned 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 shifted towards the use of steel instead, which is stronger and cheaper, with welded building, which is quicker and requires less labour. It should be noted, however, that wrought iron boilers corrode significantly slower than their modern-day steel counterparts, and are less susceptible to localized stress-corrosion and pitting. This makes the longevity of old wrought-iron boilers much more advanced than those of welded steel boilers.
Cast iron might be utilized for the heating vessel of domestic water heaters. Although such heaters are usually termed "boilers" in some countries, their purpose will be to produce hot water, not steam, and so they run at low pressure and try to avoid boiling. The brittleness of cast iron helps it be impractical for high-pressure steam boilers.
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Energy
The source of heat for a boiler is combustion of some of several fuels, such as wood, coal, oil, or natural gas. Electric vapor boilers use level of resistance- or immersion-type heating elements. Nuclear fission is also used as a heat source for generating steam, either straight (BWR) or, generally, in specialised warmth exchangers called "steam generators" (PWR). Warmth recovery vapor generators (HRSGs) use heat rejected from other processes such as gas turbine.
Boiler efficiency
there are two methods to gauge the boiler efficiency 1) direct method 2) indirect method
Immediate method -immediate approach to boiler efficiency test is more functional or more common
boiler efficiency =Q*((Hg-Hf)/q)*(GCV *100 ) Q =Total vapor stream Hg= Enthalpy of saturated steam in k cal/kg Hf =Enthalpy of give food to drinking water in kcal/kg q= quantity of gas use in kg/hr GCV =gross calorific value in kcal/kg like family pet coke (8200 kcal/KG)
indirect method -to gauge the boiler efficiency in indirect method, we are in need of a following parameter like
Ultimate analysis of fuel (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 energy in kcal/kg
ash percentage in combustible fuel
GCV of ash in kcal/kg
Configurations
Boilers can be classified into the following configurations:
Container boiler or Haycock boiler/Haystack boiler: a primitive "kettle" where a fireplace heats a partially filled drinking water container from below. 18th century Haycock boilers produced and stored large quantities of very low-pressure vapor generally, often barely above that of the atmosphere. These could burn wood or frequently, coal. Efficiency was suprisingly 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 accommodate the vapor (steam space). This is the type of boiler used in nearly all steam locomotives. The heat source is in the furnace or firebox that needs to be kept permanently surrounded by water in order to keep up the temp of the heating surface below the boiling point. The furnace can be situated at one end of a fire-tube which lengthens the road of the hot gases, thus augmenting the heating system surface which can be further increased by making the gases invert direction through another parallel tube or a lot of money of multiple pipes (two-pass or come back flue boiler); alternatively 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 expands from the firebox and the hot gases go through a bundle of fire pipes inside the barrel which greatly escalates the heating surface compared to a single pipe and further improves heat transfer. Fire-tube boilers have a comparatively low rate of steam creation usually, but high steam storage capacity. Fire-tube boilers mostly burn off solid fuels, but are readily flexible to those of the liquid or gas variety.
Diagram of a water-tube boiler.
Water-tube boiler: In this type, pipes filled with water are arranged inside a furnace in a true variety of possible configurations. Often the water pipes connect large drums, the lower ones containing water and the upper ones water and steam; in other instances, like a mono-tube boiler, drinking water is circulated with a pump through a succession of coils. This kind generally gives high steam production rates, but less storage space capacity than the above. Water pipe boilers can be made to exploit any warmth source and are generally preferred in high-pressure applications since the high-pressure water/vapor is included 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 where tubes are close jointly and drinking water is pumped through them. A flash boiler differs from the type of mono-tube steam generator where the tube is permanently filled with water. In a flash boiler, the tube is kept so hot that water feed is quickly flashed into steam and superheated. Flash boilers got some use in automobiles in the 19th century and this use continued into 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 following manner: the firebox consists of an set up of water tubes, called thermic siphons. The gases go through a conventional firetube boiler then. Water-tube fireboxes were installed in many Hungarian locomotives,[citation needed - but have met with little success far away.
Sectional boiler. Within a solid iron sectional boiler, sometimes called a "pork chop boiler" the water is contained inside ensemble iron areas.[citation needed - These sections are assembled on site to make the finished boiler.
Safety
See also: Boiler explosion
To define and secure boilers safely, some professional specialized organizations such as the American Culture of Mechanical Technical engineers (ASME) develop standards and regulation rules. For example, the ASME Boiler and Pressure Vessel Code is a typical providing a wide range of rules and directives to ensure compliance of the boilers and other pressure vessels with safety, design and security standards.[5 -
Historically, boilers were a source of many serious injuries and property destruction due to badly understood engineering principles. Thin and brittle metal shells can rupture, while badly welded or riveted seams could start, leading to a violent eruption of the pressurized vapor. When drinking water is converted to vapor it expands to over 1,000 times its original travels and volume down steam pipes at over 100 kilometres per hour. Because of this, steam is a superb way of moving energy and high temperature around a site from a central boiler house to where it is needed, but without the right boiler feed water treatment, a steam-raising seed are affected from level corrosion and formation. At best, this boosts energy costs and can lead to poor quality steam, reduced efficiency, shorter plant life and unreliable operation. At worst, it can result in catastrophic failure and loss of life. Collapsed or dislodged boiler pipes can also squirt scalding-hot steam and smoke from the air intake and firing chute, injuring the firemen who insert the coal in to the open fire chamber. Extremely large boilers providing hundreds of horsepower to operate factories can potentially demolish entire buildings.[6 -
A boiler that has a loss of feed drinking water and is permitted to boil dry out can be extremely dangerous. If give food to drinking water is then sent into the unfilled boiler, the tiny cascade of incoming drinking water instantly boils on connection with the superheated metallic shell and leads to a violent explosion that can't be managed even by security steam valves. Draining of the boiler can also happen if a leak occurs in the steam supply lines that is larger than the make-up water source could replace. The Hartford Loop was developed in 1919 by the Hartford Steam Boiler and Insurance Company as a method to assist in preventing this condition from taking place, and thereby reduce their insurance claims.[7 - [8 -
Superheated steam boiler
A superheated boiler on a steam locomotive.
Main article: Superheater
Most boilers produce vapor to be used at saturation heat range; that is, saturated vapor. Superheated steam boilers vaporize the water and additional heating the steam in a superheater then. This provides steam at higher heat range, but can decrease the overall thermal efficiency of the steam generating place because the higher vapor temperature requires a higher flue gas exhaust temperatures.[citation needed - There are many ways to circumvent this issue, by giving an economizer that heats the give food to water typically, a combustion air heating unit in the hot flue gas exhaust route, or both. You can find benefits to superheated vapor that may, and often will, increase overall efficiency of both steam generation and its utilization: gains in input heat to a turbine should outweigh any cost in additional boiler problem and expense. There can also be practical limitations in using damp steam, as entrained condensation droplets will harm turbine blades.
Superheated steam presents unique safety concerns because, if any operational system component fails and allows steam to flee, the high temperature and pressure can cause serious, instantaneous harm to anyone in its path. Since the escaping steam will at first be completely superheated vapor, detection can be difficult, although the extreme heat and sound from such a leak indicates its presence clearly.
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 temp in this field is typically between 1,300 and 1,600 °C (2,372 and 2,912 °F). Some superheaters are glowing type; that is, they absorb warmth by radiation. Others are convection type, absorbing warmth from a fluid. Some are a mixture of the two 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 temp of the steam in the superheater increases, the pressure of the vapor does not and the pressure remains exactly like that of the boiler.[9 - Almost all steam superheater system designs remove droplets entrained in the steam to avoid harm to the turbine blading and associated piping.
Supercritical steam generator
Boiler for a power flower.
Main article: Supercritical steam generator
Supercritical steam generators are used for the production of electric power frequently. They operate at supercritical pressure. In contrast to a "subcritical boiler", a supercritical steam generator operates at such a higher pressure (over 3,200 psi or 22 MPa) that the physical turbulence that characterizes boiling ceases that occurs; the fluid is liquid nor gas but a super-critical fluid neither. There is no generation of steam bubbles within water, because the pressure is above the critical pressure point of which vapor bubbles can develop. As the fluid expands through the turbine levels, its thermodynamic condition drops below the critical point as it can work turning the turbine which converts the electrical generator from which power is ultimately extracted. The fluid at that point may be considered a mixture of steam and liquid droplets as it passes into the condenser. This results in less fuel use and for that reason less greenhouse gas production slightly. The term "boiler" should not 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 steam pressure in the boiler. Boilers generally have two or three 3 pressuretrols: a manual-reset pressuretrol, which functions as a security by setting the upper limit of vapor pressure, the working pressuretrol, which controls when the boiler fires to maintain pressure, and for boilers outfitted with a modulating burner, a modulating pressuretrol which handles the amount of fire.
Security valve: It can be used to alleviate pressure and prevent possible explosion of a boiler.
Water level signals: They show the operator the amount of fluid in the boiler, also called a view cup, water gauge or water column.
Bottom level blowdown valves: They offer a way for removing solid particulates that condense and lay on underneath of the boiler. As the name indicates, this valve is situated straight on underneath of the boiler usually, and is sometimes opened up to use the pressure in the boiler to push these particulates out.
Continuous blowdown valve: This enables a small level of water to escape continuously. Its purpose is to avoid the water in the boiler becoming saturated with dissolved salts. Saturation would business lead to foaming and cause water droplets to be carried over with the steam - a disorder known as priming. Blowdown is also often used to monitor the chemistry of the boiler drinking water.
Trycock: a type of valve that is often use to manually check a water level in a tank. Most commonly found on a drinking water boiler.
Flash container: High-pressure blowdown enters this vessel where in fact the steam can 'flash' safely and become used in a low-pressure system or be vented to atmosphere while the ambient pressure blowdown flows to drain.
Automatic blowdown/constant heat recovery system: This system allows the boiler to blowdown only once makeup water is flowing to the boiler, thereby transferring the maximum amount of heat possible from the blowdown to the make-up water. No flash container is generally needed as the blowdown discharged is close to the heat of the make-up water.
Hand holes: They are steel plates installed in openings in "header" to permit for inspections & installation of tubes and inspection of inner surfaces.
Steam drum internals, a series of display screen, scrubber & cans (cyclone separators).
Low-water cutoff: It really is a mechanical means (usually a float change) that is used to turn off the burner or shut down gasoline to the boiler to avoid it from working once the drinking water runs below a certain point. If a boiler is "dry-fired" (burnt without drinking water in it) it can cause rupture or catastrophic failing.
Surface blowdown collection: It provides a means for removing foam or other lightweight non-condensible substances that tend to float on top of water inside the boiler.
Circulating pump: It really is designed to circulate drinking water back again to the boiler after it has expelled a few of its heat.
Feedwater check valve or clack valve: A non-return stop valve in the feedwater series. This can be fitted to the side of the boiler, just below the water level, or to the very best of the boiler.[10 -
Top feed: Within this design for feedwater injection, the water is fed to the very best of the boiler. This can reduce boiler fatigue caused by thermal stress. By spraying the feedwater over some trays water is quickly warmed which can reduce limescale.
Desuperheater pipes or bundles: Some tubes or bundles of pipes in the water drum or the steam drum made to cool superheated steam, in order to provide auxiliary equipment that does not need, or may be damaged by, dry out steam.
Chemical substance injection line: A connection to add chemicals for controlling feedwater pH.
Steam accessories
Main vapor stop valve:
Steam traps:
Main vapor stop/check valve: It is utilized on multiple boiler installations.
Combustion accessories
Gas oil system:gasoline oil heaters
Gas system:
Coal system:
Soot blower
Other essential items
Pressure gauges:
Feed pumps:
Fusible plug:
Inspectors test pressure gauge attachment:
Name dish:
Registration plate: |
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