Why are blast furnaces lined with fire bricks?
They are lined with fire bricks because of the intense heat and chemical reactions that are present in the blast furnace. The temperature alone would quickly melt the outer metal shell. Different types of bricks are used in the different parts of the furnace depending on the temperature in that part of the furnace, the lowest temperatures being at the top, and the highest temperatures in the bottom in what is known as the bosh and the hearth. Abrasion and mechanical damage can also occur to the bricks, which is why blast funaces need to be shut down after a certain number of years to be relined, or shut down briefly for maintenance which would include adding more cooling in areas where the brick lining is getting too thin.
What are the different kinds of cold storage?
There are a number of different cold storage options. These include a walk-in cold storage room, a walk-in vault, a free standing freezer, as well as a leased commercial cold storage unit.
What is the meaning of en-steel?
German Engineers developed the system for coding special alloy steels during the first world war. EN means Emergency Number.
a hex bolt is bolt having six face head operated by spanner.
an allen bolt is bolt having a six face groove in the head and operated by a special type of L shape key called allen key.
Where is Samuel Colts first wooden model of the revolver?
Some of the 'pieces' are in the the Texas Ranger museum in Waco. The wooden design, differs from the final version. It is not entirely clear if the gun was ever actually assembled in its wooden form or whether the parts were just used to show to the gunsmith that made the Paterson.
I have just finished a novel that features this legendary wooden gun.
Update. Some wooden pieces and the prototypes are in the Wadsworth Atheneum museum as part of their Colt collection.
How are the economy and the infrastructure related to each other?
The economy consists of the exchanging goods, productions, and services among a group of people; infrastructure is the basic support system needed to keep an economy going.
Yes, but the maximum flight time is still quite short.
What is Value Gap in Value Engineering?
VA is a systematic, rational and structured process. Yet itsfoundation is based on the effective use of people in the form ofteams.
What is the locomotive iron tire?
A locomotive iron tire is the very outer rim of a drive wheel on a locomotive that contacts the rail. It is heated up with a special cicular manifold that applies a flame (usually gas) around the entire diameter. This expands the diameter enough so it will fit over the wheel, and when it cools the tire will shrink to make a very secure bond with the wheel. This was a common practice in the age of steam engines because the wheel was a more complicated, and therefore, expensive part to replace in entirety. Since the primary wear is between the rail and the wheel surface that contacts it, replacing just that outer rim is more economical, and allows the wheel itself to be made from iron or other metal, such as steel that facilitates the moving parts that are attached to it. Heat shrinking is also used to attach the wheel of a modern train, which are typically a smaller diameter, (contained in an assembly known as a 'truck') to its axel.
1.73, the square root of 3.
Motors are rated in horsepower, not KW.
What is electrode function in mold design?
An electrode is used by the EDM (electro discharge machine) in actually fabricating the injection mold. An EDM uses either carbon (like pencil lead) or other material to burn the part shape into the mold. It's not part of the mold per se but used to make it.
Can nitrogen be used to purge gas pipes before welding?
Yes, and No, Nitrogen can be used to purge gas lines prior to welding, but the correct answer depends on several things, mainly, your welding application. A significant amount of resistance welding applications use N2 as a suitable environment for welding. Other applications use N2 as a purge gas, and then purge the N2 with the process gas. That said, if you were going to be using a different inert gas (Argon, Helium, Xenon, etc.) to provide the actual the actual shield for the weld, then you would still need to displace (purge) the N2 from the lines.
The last statement leads to the question of; if you are going to have to purge the lines anyway, why do it twice? The answer to this question is pretty basic. Nitrogen is cheap. If you had to purge a lot of lines, or a large volume of space, you would rather use N2 to drive out the Oxygen and lower the dew point (moisture). Using one of the other welding gases would cost about ten times as much to perform the operation.
How are plastic polymers joined together?
Do you mean at the molecular level (covalent and ionic bonds, and van der Waals forces take care of this), or do you have two plastic parts you want to join together? If it's the second... you can use adhesives
you can use fasteners
you can weld them together
you can design the two objects so they mate
or you can cast the second piece around the first one.
Involves the transfer of carbon from one reservoir to another?
i have the same work sheet as you haha!
carbon cycle
How do know the kind of career you want in future?
You can never be 100% sure about what you will do in your future until the time comes. However, there are several ways in which you can slowly discover your interests. Take advantage of elective classes, participate in school clubs, join a company or organization, or start a new hobby. Do extra research in the Career Center, Internet, or library. Talk to academic advisors and interview those who have careers. Keep an open mind when deciding your career and explore as many options as you can. Find your passion and apply doing what you love into your future career.
Why is voltage always stepped up and stepped down in multiples of 11?
The reason is some thing historical. In olden days when the electricity becomes popular, the people had a misconception that in the transmission line there would be a voltage loss of around 10%. So in order to get 100 at the load point they started sending 110 from supply side. This is the reason. It has nothing to do with form factor (1.11). Nowadays that thought has changed and we are using 400 V instead of 440 V, or 230 V instead of 220 V.
What were the 10 major measurement disasters?
stop doing your IED homework here ill be your hero go to www.morrayeclass.com/IED/Project131HistoryMeasurement.htm good luck caps must be correct
Can you give me the US equivalent to 6 bar air pressure?
1 bar = 14.5 psi. If you mean gauge pressure, ie pressure above atmospheric, 6 bar would be 87 psig
Can I split crablegs before I steam them?
no. all the meat is still attached to the shell and will be a mushy mess. once you boil them, it is very easy to take the meat out.
What is true bar means in stainless steel?
True Bar in stainless steel means the manufacture of the bar is rolled on the thickness and the width, attaining a more 90 degree relationship to thickness and width, unlike sheared and edged condition stainless, which is sheared from stainless plate, which offers a rough, usually out of square edge. True bar also may be defined as HRAP (hot rolled annealed and pickled), thus if you see a listing 304/304L HRAP, it is a True Bar, as this is a stainless rolled product.