Flame arrestor is a safety device which shell be used in preventing combustion in pipe Generally F.A.is installed in pipe for running or vent pipe such as torch assembly,heating process furnace, oil gas recovery and other combustiblegas systems.

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As the new energy-saving and environment-friendly materials stainless steel compound pipe has been listed in the specially recommended products of China the Social Survey Institute of State Department in 2002. The products are widely used in public works such as steel structure works road and bridge guardrails lamp poles road signs billboards industrial pipe vehicles and ship luggage rack and rails vehicle pipe and spare parts structure decorative grid steel furniture medical equipment fitness equipment and other fields.

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In order to analyze the influence of the center air pipe diameter change on the combustion effect, numerical modeling was applied to numerical calculation on the temperature field of such type of boiler,through which temperature field in five different schemes were obtained. In addition, the influence law of change of the diameter of the center air pipe on the temperature field was analyzed. The temperature of the nearly-back wall region takes on a firstly decreasing and then increasing change with the diametrical decrease of the central wind pipe.

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In recent years,the technique of pipe jacking construction has been developed quickly and widely applied in water supply and drainage pipe projects in China,but it is required to study and discuss the mechanism of soil disturbance and changes of soil properties during pipe jacking.

在前人的基礎(chǔ)上，研究了頂管施工引起土體擾動(dòng)的機(jī)理激情一级，提出了更加準(zhǔn)確的土體擾動(dòng)分區(qū)圖日本玖玖玖在线视频。

In recent years, the technique of pipe jacking construction has been developed quickly and widely applied in water supply and drainage pipe projects in China, but it is required to study and discuss the mechanism of soil disturbance and changes of soil properties during pipe jacking.

近年來(lái)色天使影院，頂管施工技術(shù)在中國(guó)得到迅速發(fā)展色妞网黄污，并廣泛應(yīng)用于給排水管道工程，但頂管施工中土體的擾動(dòng)機(jī)理及土體性狀的變化有待深入研究與探討在线视频日韩视频二区。

The efficiency is poor and the precision is unassured in traditional jacked-pipe construction surveying. Control system in jacked-pipe construction surveying with total station is introduced, which adopts single-station and simultaneously center-line-taking and elevation control. In the process, the instrument is connected with portable computer providing corresponding software. The locus of spots is shown in time, the center line direction of pipe and the deviation of elevation is directly obtained at the same time.

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In order to do research on pipe flow and pump characteristics of polymer flooding and water flooding rod-pumped well in especially high water-cut stage, rheometric test aimed at production stream from polymer flooding and water flooding rod-pumped well in especially high water-cut stage has been made, and the characteristic of production stream in especially high water-cut stage is confirmed as Newtonian fluid. Experiments using different mediums about pipe flow and pump characteristics is made. Frictional resistance and coefficient of friction resistance of annulus fluid between sucker rod and the pipe flow is calculated under different working conditions. Frictional resistance between plunger and pump barrel under different parameters is calculated based on related theory of pump characteristic and the strained analytical model of oil-well pump. Besides, using the theory of slit flow and hydraulic -clamping pressure, the frictional resistance is calculated, and the error between the result and measured value is no more than 13%.

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The steam acts upon the surface of the water in the receiver, which surface only being heated by the steam, it does not condense, but the steam gravitates or presses with an elastic quality like air, and still increasing its elasticity or spring, until it counterpoises, or rather exceeds, the weight of the column of water in the force pipe, which then it will necessarily drive up that pipe; the steam then takes some time to recover its power, but it will at last discharge the water out at the top of the pipe You may see on the outside of the receiver how the water goes out, as well as if it were transparent; for, so far as the steam is contained within the vessel, it is dry without, and so hot as scarcely to endure the least touch of the hand; but so far as the water is inside the vessel, it will be cold and wet on the outside, where any water has fallen on it; which cold and moisture vanish as fast as the steam takes the place of the water in its descent.

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Following, a experiment has been carried out, the incident waves with a frequency band of 200kHz-3 50kHz are used to the experiment, and a series of peak value-time curves are drawn each 10kHz, corresponding time are found through fitting peak value, thus the position of the defect is calculated accurately. The application of awl-shaped sensor head in the heat change water pipe experiment indicates that the ultrasonic guided waves may transmit nearly 50 meters in the pipe, which is not influenced by the elbows and makes it possible to test defects in long distance and large-scale. The water-load pipe experiment indicates that the displace and energy maybe leakage at the near-surface, which is significant for the further research.

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Pipe heat causes linesr expansion and rurtherresult in tensile stress in the direction of pipe xale to make cracks in direction perpendicular to the axle,in the case ,the stress value is obtained by ormula=E,and if ,it is estimated with 15mm LG PEX-A Pipe as base,the sectional breaking rorce is estimated approx.7.6kg/cm2,being much more little comparing with the concrete bearing force=1,536kg/cm2and its not needed to be anxious to concrete cracking rising.

由于管子的線性熱膨而使管子受軸向伸長(zhǎng)力，從人在與管軸成直角的方向上產(chǎn)生裂縫久久性激情，這時(shí)的應(yīng)力接計(jì)算经典A片免费观看视频，PEX－A按直徑15mm標(biāo)準(zhǔn)計(jì)算進(jìn)斷面破壞強(qiáng)度約為7.6kg/cm2，比混凝土的支持力1.58kg/cm2小得多自拍少妇亚洲，所以不需要考慮管子對(duì)混凝土的破壞作用日本三级a网站。