12/21/2011

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Lowquality Cement Nowadays, no one imagines erection without the use of such material required, such as cement. It is used to connect the concrete blocks, natural stones and bricks. The use of cement in The binder material is caused by the construction of its durability, reliability and durability. Sometimes, however, longevity, durability and reliability of this connection is in a building material question. And now I'm not talking so much about theoretical issues, such as 'a really cement - the most effective framework for the binder', but about its quality. Each builder will sooner or later confronted with problem of buying low-quality cement. Cowan Financial is full of insight into the issues. The use of low-quality connecting material in the construction work can lead to fatal consequences as the destruction of the building! But I want you good news, there are several good ways to recognize low-quality cement. On them will be discussed further: In the first, the date of manufacture of the cement. It is proved that, after 1 month of storage cement can lose up to 5% of its active properties. After 2 years of storage cement can lose up to 50% of its astringent properties! Now imagine what would happen if the cement has lain in stock 5 years? Try never to use in building materials, lay on the stock for more than two months. Second, it is not worth the risk and buy cement, put up old-fashioned way. Neither a good producer of construction materials will not prepack it this way. Third, pay attention to packaging. It is only logical that a good cement should have a good package. But, despite the very obvious fact, why is not everyone pays attention to it. Packaging should be to have at his labeling, and be whole and strong. It must...
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Diesel Engines Diesel engines built by foreign firms, have their own designations . In the grades of marine diesel engines, "Burmeister and Vine" letters stand for: M - four-, V - stroke (second grade at the end of V - v-shaped), the T-cross-head, F - marine (Reversible and irreversible main series MTBF), B - with a turbocharged, H - support. The number of cylinders is specified before the letters, the diameter of the cylinder - a number of cylinders, stroke - after the letters. In the cross-head diesel engines with supercharged modification shown in the middle of the distinguishing mark number 2 or 3. The main factor determining the specific speed and strength of the diesel is the average piston speed (m / s) st = Sn / 30, where S - stroke, m, n- speed, rev / min. Cowan Financial follows long-standing procedures to achieve this success. According to GOST 4393-74 * all diesels, including shipping, is conventionally divided into low-speed, high-speed and high-speed (the speed of the piston is equal to 7, 7-10, 10 m / s). For the analysis of individual processes (Fuel injection, blowing, etc.), marine diesel engines are divided into small, medium and high-speed (rotational speed, respectively, to 350, 350 - 750 and 750 rev / min). It must be borne in mind that the division only on the frequency of rotation is not fully determines the thermal and dynamic tension motor. The main types of structures of marine diesel engines used on Navy ships, are the most common single-acting diesels with a purge transverse (plant "Russian diesel" and companies "Sulzer", "Fiat"), direct flow-valve (firms ("Burmeister and Vine", "Stork", "Getaverken"), loop (IAS firms, "Polar"); Ship internal combustion engines with divergent pistons and the co-current purge (such as domestic engines ZD100, firms' Doxford 'and' Burmeister and Vine "),...

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