
	Where results make sense

Topic: Compress gas

In the News (Thu 31 Dec 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Gas compressor - Wikipedia, the free encyclopedia
		A gas compressor is a mechanical device that increases the pressure of a gas by reducing its volume.
		As gases are compressible, the compressor also reduces the volume of a gas, whereas the main result of a pump raising the pressure of a liquid is to allow the liquid to be transported elsewhere.
		Centrifugal compressors — a vaned rotating disk or impeller in a shaped housing forces the gas to the rim of impeller increasing the velocity of the gas.
	en.wikipedia.org /wiki/Gas_compressor (1257 words)

	Lubrication of natural gas compressors
		The gas is moved with the use of many types and sizes of compressors that collect, pressurize and push the gas though the distribution pipes to the various processing centers and points of use.
		The compressors that move the gas are located in ships and drilling fields, in chemical and process plants, and in the huge maze of pipes that makeup the distribution network, which brings gas to the market in a pure, useable form.
		Gas pressures in pipelines used to transport natural gas are typically maintained at 1000 to 1500 psig.
	www.oilmaintenance.com /ml/200205/lub101.asp (1910 words)

	nash_elmo - Oil & Gas (Site not responding. Last check: 2007-10-24)
		This application may also include associated gas, which is merely the inclusion or recovery of gas at the annulus of the well, with the oil being recovered and the separation of the oil/gas via a separator at the point of recovery, normally at the surface of the well.
		By using a compressor to compress the gas into a sparging unit piped into the tank, the gas serves to provide heat and to agitate the slurry, keeping it in suspension, and also activating the bugs to eat the decomposed material or sludge.
		A compressor is also used to recover this gas and to compress it to a natural gas engine, which is used to drive a generator to produce electricity for cogeneration or to feed boilers, furnaces, etc.
	www.nash-elmo.com /english/industries-nash_elmo/oil-vacuum-pumps-compressors.cfm?MainMenu=NavIndustries&TierMenu=TierOil (1028 words)

	Gas turbine
		Although the gas turbine must be started by some external means (a small external motor or other source, such as another gas turbine), it can be brought up to full-load (peak output) conditions in minutes as contrasted to a steam turbine plant whose start up time is measured in hours.
		The gas turbine exhaust is then used to produce steam in a heat exchanger (called a heat recovery steam generator) to supply a steam turbine whose output provides the means to generate more electricity.
		Centrifugal compressors (with compressed air output around the outer perimeter of the machine) are robust, generally cost less and are limited to pressure ratios of 6 or 7 to 1.
	www.students.itu.edu.tr /~yildirimo4/ozet.htm (3003 words)

	[No title]
		DEFINITION OF COMPRESSED GAS CYLINDER A compressed gas cylinder is any cylinder specifically designed to contain gases under pressure of greater than one atmosphere, and having the capability of dispensing the gas by the means of a control valve mechanism to assure the safe and proper use of the gas at a point of operation.
		Acetylene and Linde FG-2 Acetylene is a colorless gas with a distinctive garlic-like odor.
		Compressed gas cylinders shall be legibly marked for the purpose of identifying the gas content with either the chemical or the trade name of the gas.
	www.doa.state.wi.us /docs_view2.asp?docid=2513 (2873 words)

	JWPCP Power Generation
		From there, the digester gas is directed to a surge tank to remove surges from the low-pressure digester gas supply and act as a mixing chamber for natural gas prior to compression.
		Three compressors are used to compress digester gas or a mixture of digester gas and natural gas from approximately 10 inches of water to 350 pounds per square inch (psig).
		Prior to combustion in the gas turbines, the high-pressure digester gas is chilled to 40 degrees Fahrenheit to remove most of the remaining water vapor.
	www.lacsd.org /jwpcp/tef.htm (622 words)

	Natural Gas Heaters in the Compressor Industry
		When natural gas has to be transferred from the drilling site to the distribution center, the predominant method of transportation is by pumping the gas through a network of pipelines.
		Compression reduces the volume of the gas, thus allowing pipe diameters to be as small, and thus least expensive, as possible.
		At utility gas let down stations, the natural gas transmitted through the pipelines is reduced in pressure from the transmission pressure (up to 700 psi) down to a pressure range of 30-50 psi.
	www.apiheattransfer.com /en/Applications/Compressor-NaturalGasHeaters.htm (483 words)

	Lunch With George! : Gas Temperature Discussion
		He demonstrates via a figure (1.3) that if the piston is slowly moved to compress the gas, the temperature of the gas will rise (see a great applet which demonstrates this concept!).
		The reason for this result is that as gas molecules collide with the piston which is moving downward (i.e., toward the gas), the piston imparts a net gain in speed to each molecule (thus increasing the motion, and therefore the temperature, of the molecule and the gas as a whole).
		Compressing the warm low-pressure gas back to a high-pressure liquid and then allowing it to evaporate (low pressure liquid changes to low pressure gas) creates the cooling.
	www.lunchwithgeorge.com /lwg_gastemp.html (747 words)

	MichPSC-About MI's Gas Industry
		The engines driving the compressors are generally gas burning, using a small percentage of the gas passing through the station to compress gas coming into the station to a higher outlet pressure.
		Natural gas utilities in Michigan currently purchase their gas supplies from various sellers at the source of the interstate pipelines, and pay the pipelines solely to transport their gas (see pipeline Tariff Books).
		The first interstate gas to be imported to Michigan on a sustaining basis was imported by Panhandle Eastern Pipe Line Company in 1936, which delivered gas from Oklahoma and Texas to Detroit.
	www.cis.state.mi.us /mpsc/gas/about2.htm (809 words)

	Gas Laws
		T): The average kinetic energy of the particles in a gas is proportional to the temperature of the gas.
		The volume of the gas therefore becomes larger as the temperature of the gas increases.
		Thus, the volume of the gas is proportional to the number of gas particles.
	www.mpsaz.org /mrsandom/mrsandom/Gas_Laws.htm (470 words)

	Deviations from Ideal Gas Law Behavior: (Site not responding. Last check: 2007-10-24)
		Because the volume of the gas particles depends on the number of moles of gas in the container, the term that is subtracted from the real volume of the gas is equal to the number of moles of gas times b.
		The ideal gas equation predicts that a plot of PV versus P for a gas would be a horizontal line because PV should be a constant.
		According to the ideal gas equation, the pressure would have to be increased to 112 atm to compress 1.00 mol of CO at 0C to a volume of 0.200 L. The van der Waals equation, however, predicts that the pressure will only have to increase to 52.6 atm to achieve the same results.
	chemed.chem.purdue.edu /genchem/topicreview/bp/ch4/deviation5.html (1258 words)

	Cascade Natural Gas
		Natural gas is a fossil fuel that is composed almost entirely of methane.
		Natural gas is odorless and colorless, so an odor that smells like rotten eggs is injected to make leaks easier to detect.
		A gas meter measures the volume of gas that is used by the customer.
	www.cngc.com /community/gasinfo.asp (336 words)

	Workbench: A Matter of Stating the State of Matter
		The compressibility of a substance indicates the space, or lack of it, between the atoms or molecules of various states of matter.
		In each case they try to compress the substance, and then discuss why gas is compressible and liquid is not.
		If a gas is put inside a syringe and the end is sealed, one can significantly depress the plunger of the syringe, compressing the gas inside.
	www.concord.org /~btinker/workbench_web/unit1/1-08StatesOfMatter.html (993 words)

	Expert: Specialty Gas Safety and Handling Expert
		Expert was responsible for all gas disposal systems at 16 different specialty gas facilities in the U.S. He has consulted with several gas and scrubber companies on scrubbing techniques.
		He is the Course Director and Instructor for both public and in house courses for compress gas right to know to and emergency response.
		He is the instructor for a number of professional courses on compress gas.
	www.intota.com /viewbio.asp?bioID=603674&perID=108160 (907 words)

	Density of Gas and STP
		It seems that the density of a gas would depend on the size of the container that the gas is placed in.
		But if a gas takes the volume of whatever container the gas is placed in how can we explain to students that 1 mole of a gas occupies 22.4 L? I would appreciate any info.
		That number of gas molecules occupies 22.4 L. at P = 1 atm and T = 273.15 kelvins regardless of how heavy or light that each of the molecules happens to be.
	www.newton.dep.anl.gov /askasci/chem00/chem00984.htm (582 words)

	Chapter 10 Review Questions (Site not responding. Last check: 2007-10-24)
		Degenerate matter is difficult to compress because nearly all of the energy levels available to the electrons are filled.
		Therefore, since in a degenerate gas it is extremely difficult to change the energies of the electrons that compose the gas, and to compress the gas we must change the energies of the electrons, it is extremely difficult to compress the gas.
		As this gas overtakes mass lost earlier in the stars life (when the star was a giant) material piles up to form a dense shell of ionized gas.
	www.goshen.edu /nasc/NaSc200/ReviewQuestions/ch10review.html (814 words)

	Engine
		In the case of the internal-combustion engine the effect of the engine is rotational torque which can be used to cause motion, generate electricity, pump water or compress gas.
		All of these configurations refer to the position of the piston s in the cylinder block.
		A special case is the air engine which is driven by compressed air.
	www.nebulasearch.com /encyclopedia/article/Engine.html (217 words)

	Compressibility and Ideal Gas Approximations
		These temperatures are proportions of the critical temperature, which is a factor in the compressibility.
		Compressibility expresses how much a gas is behaving like an ideal gas under any conditions.
		If the compressibility deviates much from one, then the ideal gas equation will not accurately model the real gas under those conditions.
	www.shodor.org /UNChem/advanced/gas/compress.html (177 words)

	The Johns Hopkins Gazette: April 20, 1998
		The astronomers found a large concentration of water vapor within the cloud of gas, located about 1,500 light-years from Earth near the Orion nebula, a huge glowing cloud of gas and dust in the center of the constellation Orion.
		The water concentration is 20 times greater than that measured previously in other interstellar gas clouds, a finding that may provide an important clue to the origin of water in the solar system.
		"Even though the interstellar gas is composed primarily of hydrogen molecules, water vapor is a particularly efficient radiator at far-infrared wavelengths and plays a critical role in cooling the gas and facilitating the star formation process," Harwit said.
	www.jhu.edu /~gazette/aprjun98/apr2098/20astro.html (870 words)

	Cornell News: Water in Orion
		The discovery was made within the Orion molecular cloud, a giant interstellar gas cloud, a trillion miles across, composed primarily of hydrogen molecules.
		"The interstellar gas cloud that we observed is being pummeled by shock waves that compress and heat the gas," says Harwit, who is a Cornell professor emeritus, an ISO mission scientist and lead author on the research report.
		Cornell's Harwit speculates that the shock waves observed in the Orion gas cloud could be a cause as well as the result of star birth.
	www.news.cornell.edu /releases/April98/Orion.deb.html (621 words)

	Natural Gas Compressors and Their Lubrication
		The rotary screw compressor illustrated in Figure 1 consists of two intermeshing screws or rotors which trap gas between the rotors and the compressor case.
		However, R&O (rust and oxidation inhibited) oil is often sufficient for the crankcase splash lubrication of a reciprocating compressor.
		The selection of the proper compressor and application-dependent lubricant with the appropriate physical-chemical properties is vital to a successful process, and will be addressed fully in the second part of this two-part series of gas compressor and compressor lubrication issues.
	www.machinerylubrication.com /article_detail.asp?articleid=344&relatedb... (2064 words)

	Quiz 1 (Site not responding. Last check: 2007-10-24)
		Draw a graph to show how the compressibility factor, Z, of a real gas varies when the pressure is changed.
		For an ideal gas, Z=1 (pV/nRT=1) and a gas behaves ideally at low pressures and high temperatures; under these conditions, the effect of interactions is minimized.
		At high pressures, the particle density is high, making it difficult to compress the gas; the particles are so close together that it becomes difficult compress them further.
	cas.bellarmine.edu /chem216/quiz/quiz1.htm (276 words)

	Lives and Deaths of Stars (Site not responding. Last check: 2007-10-24)
		Possible trigger mechanisms could be a shock wave from the explosion of a nearby massive star at its death or from the passage of the cloud through regions of more intense gravity as found in the spiral arms of spiral galaxies.
		Gas clouds may start to collapse without any outside force if they are cool enough and massive enough to spontaneously collapse.
		The evaporation of the dark, dense fingers of dust and gas in the Eagle Nebula was captured in the famous ``gas pillars'' picture on the right side of the figure below.
	www.astronomynotes.com /evolutn/s3.htm (1146 words)

	LidRock - "How Grills Work" (Site not responding. Last check: 2007-10-24)
		LP gas has the advantage of coming in a portable tank, and it is available nearly everywhere, whereas natural gas uses a pipe connected to the gas main at your home.
		Because natural gas doesn't compress well into a liquid form, it is typically delivered via a dedicated pipeline to your home.
		A BTU is the amount of heat required to raise the temperature of 1 pound (0.45 kg) of water 1 F (0.56 Celsius).
	www.lidrock.com /grill4.htm (422 words)

	Thermodynamics
		If compressed gas expands against the piston, work is done BY the gas (W is then negative).
		Hot gas expands air against piston so quickly that little Q has time to be lost.
		During heat transfer from a hot reservoir to a cold reservoir, a portion of the randomized kinetic energy of a gas can be converted into directed non-randomized work.
	www.physics.uc.edu /~sitko/CollegePhysicsIII/12-Thermodynamics/Thermodynamics.htm (1319 words)

	Dresser-Rand \| insights \| First Quarter 2000
		It is clear that development of a true high speed, reliable, reciprocating compressor is needed to provide consumers with the opportunity to compress gas at lower cost.
		In the areas of gas compression many years of design and operating experience are brought to bear in the development of new solutions to meet specific needs of the client.
		Specific compression solutions include: non-lubricated service, high pressure, gas transmission, gas gathering, sour gas service, hazardous gas compression.
	www.dresser-rand.com /insight/v3no1/08.asp (358 words)

	Origin of the Stars
		The public is told that all the facts of science indicate that the incredibly precisioned and complex structures of orbiting moons; planets, stars, and galaxies,—all came from gas and dust which pushed itself together.
		In outer space, the gas is millions of times more expansive than the critical compressed size needed for gravity to hold it as a stable star.
		Gas molecules are widely separated in outer space, even when they are within gas clouds.
	www.evolution-facts.org /Ev-V1/1evlch02.htm (6810 words)

	Howstuffworks "How Stirling Engines Work"
		If you have a fixed amount of gas and you compress it (decrease the volume of its space), the temperature of that gas will increase.
		The gas chambers of the two cylinders are connected, and the pistons are connected to each other mechanically by a linkage that determines how they will move in relation to one another.
		This pushes the hot gas into the cooled cylinder, which quickly cools the gas to the temperature of the cooling source, lowering its pressure.
	www.howstuffworks.com /stirling-engine1.htm (572 words)

	A Comment on Feynman, Entropy, and Uncertainty
		Feynman goes on to say that what did change during the compression is the state of the gas, and introduces the concept of entropy which he describes as rather a bizarre quantity.
		When the gas is adiabatically compressed the uncertainty in the position of the molecule decreases because there is less volume for it to be in.
		The gas temperature decreases because the internal energy of the gas must be used to work against the piston in the expansion.
	plasma-gate.weizmann.ac.il /~peter/notebooks/feynman.php (1440 words)

	GPN-2000-000955 - The Cat's Eye Nebula
		Estimated to be 1,000 years old, the nebula is a visual "fossil record" of the dynamics and late evolution of a dying star.
		The suspected companion star also might be responsible for a pair of high-speed jets of gas that lie at right angles to this equatorial ring.
		Like a stream of water hitting a sand pile, the jets compress gas ahead of them, creating the "curlicue" features and bright arcs near the outer edge of the lobes.
	grin.hq.nasa.gov /ABSTRACTS/GPN-2000-000955.html (311 words)

Try your search on: Qwika (all wikis)