Mechanical Engineering

The Thermal Conductivity Value is important because it allows engineers or anyone find a material that insulates something like a shuttle to make sure that the extreme heat of re-entry or the extreme cold of space travel will not come in and boil astronauts or freeze them out. The lower the Thermal Conductivity Value the better it insulates.

It is the only type of weld you can make to seal this type of joint. There are flange ends that can be welded onto pipe with a butt weld, but sockets and slip-ons must be fillet welded.

Gauge actually refers to the number of feet of iron wire it takes to weigh a pound....it takes 10 feet of 10 gauge iron wire to make a pound and it takes 30 feet of 30 gauge iron wire to make a pound.

at some point in time this got applied to sheet metal and this gauge system works about the same way.....the bigger the number the thinner the sheet metal.

Eg:

The higher the gauge, the thinner the metal. If I'm not mistaken gauge is measured in millimeters, only backwards.

Like in electrical wiring, 14 guage wire is about a 16th inch and 10 guage is almost a 1/4 inch etc. etc.

In otherwords, the lower the gauge the thicker it is.

The yield strength is reached when the material becomes non - linear ( that is non elastic) and takes a permanent set when load is released. Material stretches but does not break. Ultimate strength is when it breaks and is higher than yield strength.

It stands for Deutsches Normung=German standard and usually applies to dimensional information in the metric system. Hence DN50 is for 50mm.

Safety is important when welding. Make sure you have protective clothing (jacket, no frayed pants, helmet with proper shade, steel toe boots if material falls, etc.) Make sure people around you know your welding! Eye surgery sucks! NO Flammable liquids! (lacquer thinner is great for cleaning dirty metal before welding, but causes really big flames if you don't wipe off with a simple green type cleaner) Know where to kill the power if you have a problem, and where the extinguishers are VENTILATION! Clean air, good, welding fumes not so good.

1 TON of air conditioning requires 400 cubic feet per minute of air movement in the average HVAC system.

there are stages, fixed blades on the turbine shell and rotating blades on the rotor. They are very close together sooo, because the steam enters at one end of the turbine it heats that area first and it expands the metal there faster than at the other end causing it to rub. if you heat it slowly the turbine casing and the rotor grow at ~ the same rate so the stages don't rub together. If you heat too quickly,by just admitting a high volume of steam, the rotor heats up to fast, because of it has less metal to heat up, it rubs the fixed blades. this is called going long (the rotor is longer than the tolerances between the fixed blades on the casing)

Q235A and Q235B, the main difference lies in the carbon content, carbon content of Q235A in 0.14-0.22, Q235B carbon content in 0.12-0.20

Relatively speaking Q235B mechanical performance is far superior to Q235A steel. Which Q235B do stamping experiment, Q235A do stamping experiment.

Q235A good toughness, has a certain degree of elongation, good welding and processing of. Q235A general in the hot state, the rolled steel, steel, steel plate, steel tube can be used for manufacturing various welding structures, bridges and generally not significant parts of the machine, such as bolts, rivets, pull rod, ring and the connecting rod.

Q235B has a certain degree of elongation, strength, good toughness and casting of. Ease of stamping and welding, widely used in general machinery parts manufacturing. Mainly used for construction, bridge engineering quality requirements of high structure.

When a pump is pumping water from a level that is below the pump it is called suction head. If the water to be pumped is at a level above the pump, it is positive head. The pump maybe pumping from the base of a tank to a higher level such as an elevated tank or it may be pulling water from a tank that is below the pump. The distance from the center of the pump to the top of the water level would be the foot of head. It takes 2.31 feet to make 1 P.S.I. So if it is 10 feet from the center line of the pump to the water level, you would have about 4.33 P.S.I. of head.

Moduflex dual valve combines two, 4-way valves into one valve body, it features two independently operated valves in the Size 1 valve body. :)

In order to increace the efficincy of a machine, you must eliminate losses of

energy between the input and the output. This almost always means reducing

or eliminating friction, either within the guts of the machine, or between the

machine's moving parts and the outside world. That's the reason that greases,

oil, other lubricants, and streamlining are so popular.

A claw hammer is a lever when using the claw to pull a nail. A crowbar or pry bar is also a lever. Automobile friction jacks are also levers. Your arm is a biological (biomechanical) lever.

water frame

If you are still at school, then i would say do your best in maths, Science (Physics), and tech. That is all you need really, although it is a bonus if you can get your GCSE in English and IT as well as you will not need to re-du these as a key skill at college.

metal with out the properties that combine and then materialize into a base form of solid mass, or as known as carbon emulsified over and over repeatedly becomes a hairline, unlike brass metal.

This is because the actual mechanical advantage is the actual calculation found after dividing the effort force by the output force. Ideal mechanical advantage is what many people would call and estimate. When estimating mechanical advantage, the numbers are always rounded. This makes actual mechanical advantage less.

Sources: Science teacher

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The answer above is incorrect.

The ideal mechanical advantage (IMA) is usually less than the mechanical advantage (MA) in a given machine because of the friction acting on the machine. There will always be some frictional resistance that increases the effort necessary to do the work.

• Carbon (C) 0.95
• Manganese (Mn) 1.2
• Silicon (Si) 0.4
• Chromium (Cr) 0.5
• Tungsten (W) 0.5
• Vanadium (V) 0.2
• Phosphorus (P) 0.03
• Max Sulfur (S) 0.03

Hot-rolled steel plate Q235A.

Equivalent standard:

JIS G3103/

JIS G3106/

ASTM A283/

EN10025/

ISO630

*Please notice that Q235A Chinese steel has exact equivalent by EuroNorms only.

This is S235JR.As for other countries the closest grades are ASTM A 750 Gr. 30 and Gr.40 (USA) and SS 400 and SM 400 B (Japan).

*The most closest AISI equivalent of Chinese Q235 is 1009.

*The equivalents of Chinese grade Q235 in Europe are S235JR, S235JRG1, S235JRG2, S235J2G3. As for USA there are many ASTM standards which covers this grade. We consider that the closest equivalent is UNS K 02502.

A centrifugal pump is used on board most ships. There are many steps to overhaul one such as drain the pump, open the casing, remove the coupling, and replace the worn parts.

There's a conversion table at this website which will tell you. http://www.mesteel.com/info/carbon/thickness.htm

by u tube manometer

4mm sheet metal falls 24 gauge and 25 gauge.

24 gauge sheet metal is 3.175mm (0.125") thick, and 25 gauge sheet metal is 6.35 (0.25") mm thick.

steel is the alloy of iron and carbon , so mild steel is an ferrous alloy

APIISOSpec 6A10423Spec 9A10425Std 60710497RP 13C13501Std 200028300Spec 14A 10432:2004Spec 19G2 10708-2 MPMS Chapter 2.2E 12917-1:2002Spec 17J 13628-2:2006Spec 14L 16070:2005MPMS Chapter 2.2D 7507-4:1995TR 5C310400:2007RP 7G-210407-2:2008RP 13B-110414-1:2008RP 13I10416:2008RP 14B10417:2004Spec 7-110424-1:2004Spec 7-210424-2:2007Spec 10A10426-1:2009RP 10B-210426-2:2003RP 10B-310426-3:2003RP 10B-410426-4:2004RP 10B-510426-5:2004RP 10B-610426-6Spec 10D10427-1:2001RP 10D-210427-2:2004RP 10F10427-3:2003Spec 11B10428:1993Std 61210437:2003Std 61410438-1:2007Std 61910440-1 Std 67110441:2007Spec 5CT11960:2004 Spec 5DP11961:2008Spec 5DP11961:2008MPMS Chapter 2.2E12917-1:2002MPMS Chapter 2.2F12917-2:2002MPMS Chapter 2.2F12917-2:2002Spec 13A13500:2009RP 13M13503-1:2003RP 19C13503-2:2006RP 13J13503-3:2005RP 13M-413503-4:2006RP 8B13534:2000Spec 8C13535:2000RP 17A13628-1:2005Spec 17K13628-10:2005RP 17B13628-11:2007RP 17C13628-3:2000Spec 17F13628-6:2006RP 17G13628-7:2005RP 17H13628-8:2002RP 17M13628-9:2000RP 5A313678:2010RP 5C513679:2002Spec 5CRA13680:2010Std 53013704:2007Std 56013705:2006Std 61013709:2003Std 68914224:2006Spec 11D114310:2008Spec 6D14313:2007Spec 7K14693:2003Spec 6DSS14723:2009Std 11D215136-1:2009Std 11D315136-2:2006RP 5A515463:2003Std 662, Part 115547-1:2005Std 662, Part 215547-2:2005Std 66016812:2007Std 68221049:2004Std 52123251:2006Std 53725457:2008Spec Q129001:2007Spec 5L3183:2007MPMS Chapter 2.2C7507-3:1993MPMS Chapter 2.2C7507-3:1993MPMS Chapter 2.2D7507-4:1995Spec 16AISO 13533:2001Std 661ISO 13706:2005