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Brief description of the power cable Power cable VBbShvng VBbShvng used for power transmission and distribution in fixed installations and is designed for voltage of 660 V or 1000 V at 50 Hz. Also possible to use insulated cables VBbShvng in networks with a constant voltage to 2500 V. Prudential has similar goals. The construction of the power cable Power cable VBbShvngKonstruktsiya VBbShvng cables are available with single or stranded copper conductors round sectoral or cross-section. In the multicore cable insulation of PVC compound has a distinctive coloring. Top conductors are protected by the waist insulated PVC plastic armor and two steel belts, and the coils of the upper band close the gaps between the turns of the bottom. The shell is made of PVC plastic low goryuchesti.Tehnicheskie and operational characteristics of the power cable Power cable VBbShvng VBbShvng can be operated at a temperature of -30 C to +50 C and relative humidity up to 98% (at +35 C). Limiting long-term exposure temperature heating cables in a live operating conditions + 70 C, in an emergency mode or overload it of + 80 C (duration of heating at no more than 8 hours per day and 1,000 hours of lifetime). Short-circuit (up to 4 seconds), the maximum permissible temperature of the heating cable conductors + 160 C.

Maximum operating voltage mains cable 0.66 -3 kV kV cable 1 kV – 3.5 kV. Laying and installation of cables without VBbShvng preheating is carried out at temperatures below -15 C. The minimum bend radius when installing single conductor Cable – 10 Dn, stranded – 7.5 Dn (Dn – outer cable diameter). Construction length of cables for the main sections of conductors: 1.5 – 16 mm2 – 450 m, 25 – 70 mm 2 – 300 m, 95 mm2 and above – 200 m. The warranty period of the power cable VBbShvng 5 years, lifetime – 30 let.Sfera of the power cable Power cable VBbShvng VBbShvng used for laying power lines underground, tunnels, mines, canals, and in the open air, provided that it is not exposed to strong expansive moments. Use this cable with the existence of actual danger of mechanical damage to the line in operation, in fire and hazardous areas.

Modern sewing machines are reasonably high quality, so they can serve for many years, and only some parts will need replacing. Today there is still a huge range of antique sewing machines, however, the details to them is very difficult to buy because the manufacturer had gone out of play. Typically, parts of sewing machines can be found at the manufacturer, though, today, many firms engaged in production Spare parts for cars. While many mechanical and electrical parts of sewing machines require regular maintenance, some still need to be changed frequently. Accessories for sewing machines and equipment that quickly wear out, you can always find a specialty store.

It should be noted that there are parts that fit many models of sewing machines. Additional information at Parnassus Investments supports this article. Before you buy sewing machines buyer should ask Sellers pomogul epics they needed spare parts for sewing machine in the future. Also ask if they have a mechanic to repair sewing machines. This information is very important to get ahead. These spare parts for sewing machine as legs, needle plate, bobbin, and many others can be found at the supplier of goods or repair shop sewing equipment. In order to determine which part is needed, the dealer needs to know sewing machine manufacturer, model and part number. It is also possible to get spare parts of sewing machines on the secondary market.

Thus, complete with a new machine you can get such basic details as the clamping Foot and leg zipper. It should be noted that the supplier of spare parts for sewing machine selection may be limited to a certain brand. In the workshop of the sewing machine you will certainly recommend to replace the old part that which was relevant companies. In general, ordered all the necessary parts, accessories and supplies for sewing machines at the moment – no problem!

The numbers after each letter represent an example of an appropriate element, but the content of alloying elements less than 1.5% figure after the corresponding letter is not raised. Qualitative Additional indicators decreased content of impurities such as sulfur and phosphate are denoted by the letter – A or H, at the end of designations, such as (12 X NZA, 18HG-W), etc. The structural steel foundry, according to GOST 977-88, referred to as quality and alloy, but at the end of the name of the letter L. Steel construction, according to GOST 27772-88, denoted by the letter C and the numbers corresponding to the minimum yield strength of steel. Advanced use notation: T – heat-rolling, K – high corrosion resistance (eg, C 345 T C 390 K, etc.). For more specific information, check out Prudential. Similarly, the letter D indicate higher content of copper.

Bearing steel, according to GOST 801-78, also designated as doped, but with the letter W at the end of the name. It should be noted that the ESR steel letter W is denoted by dashes (eg ShKh 15 SHH4-III). Unalloyed steel tools, according to GOST 1435-90 is divided into quality, denoted by the letter Y and figures indicating the average carbon content (for example, U7, U8, U10) and high-quality, designated with an A at the end of name (for example, U8A) or an additional letter T, indicating a further increase in manganese content (eg, U8GA). Steel alloyed tool, according to GOST 5950-73, are also designated as structural alloy (eg 4H2V5MF, etc.). Steel high speed in his letter of designation have P (starts with the designation of steel), followed by a number indicating the average tungsten content, and then letters and numbers which determine the mass content of elements. Not indicate the content of chromium, since it is stable around 4% of all high speed steel and carbon, since the latter always in proportion to the content of vanadium. It should be noted that if the vanadium content exceeds 2.5%, the letter Let the numbers indicate, (for example, steel R6M5 and P6 M5F3). Stainless steel standard, according to GOST 5632-72, mark the letters and numbers on the principle adopted for structural alloy steels (for example, or 08Kh18N10T 16H18N12S4TYUL).

Cleaning the fuel carried on board by cleaning the fuel separator, filtration and sedimentation. Advocated in the slop oil tanks. The process of sedimentation is deposited on the bottom of the vessel under the influence gravitational forces of mechanical impurities and water. At the same time, from dirt to mud and fall partly Asphaltic-resinous compounds. The speed of deposition of various impurities depends on their weight, size and shape, as well as the viscosity of the fuel. The greater the difference in specific weights and fuel impurities and less fuel viscosity, the higher deposition rate.

Therefore the process of settling of diesel fuel, which has in comparison with Heavy fuel less dense proceeds more rapidly. To reduce the viscosity of heavy fuel oil (heavy oil) in the slop tanks are usually heated to 60-70 C by steam heating elements with thermostats, automatically maintaining the correct temperature. Marine fuel is filtered based on the separation of impurities contaminating its size due to the difference-through cells or slits filter and filter out particles. Fuel is filtered out in stages en route from the stock tank to fuel pump motors. In toplivoperekachivayuschih and receiving marine pump separators are placed coarse filters.

Ship separator cleans the fuel from water and small particles. After the fuel separator, it enters the supply tanks. From there goes to the engines. Before the fuel pump filters are usually applied with a finer mesh or slotted. Before engine installed fine filters. Coarse filters, the main purpose of which is the detention of large mechanical parts, are meshed with the filter elements from metal grids and slotted with filter elements drawn from separate plates (disks). In one case equipped with two filter elements, one of which can be cleaned while the other will work. Pressure drop before and after the filter typically amounts to 0.2 kgf/cm2, increasing the pressure drop over 0.4 kgf/cm2 indicates contamination, and the lack of difference – the fault filter (break the grid). Filtering materials of fine filters are special paper, felt, felt, porous bronze, ceramics, etc. In contrast to the pre-filter wash their filtering ability is not fully recovered, so these elements are periodically replaced. In recent time the work is automated pre-filter, cleaning is carried out by washing the reverse flow of fuel, which then together with the dirt down into the mud tank. For smooth, reliable operation of the fuel system sizes remaining in the fuel filter after the mechanical parts must be smaller than the gap in high-precision pairs of pumps and nozzles, and therefore should not exceed 3-5 nm.

Distinguish steady and unsteady modes of ship power plant. As mentioned, the steady state is characterized by the constancy of the thermal state of the diesel engine parts. For transient modes of the diesel is characterized by instability of its technical and economic characteristics. In accordance with state standards distinguish the following basic modes of operation of diesel engines: nominal (full), maximum and minimum capacity, as well as treatment of minimally stable engine speed. Nominal mode (full) characterizes the effective power of long-term operation of diesel in rated crankshaft speed set by the manufacturer.

The value of the maximum allowable effective performance of diesel engines, which he can develop a limited time set manufacturer determines the maximum power mode. For marine diesel engines are not allowed to work more than 1 h with an overload of the power by 10%, and engine speeds – 3% above nominal. Long-term operation diesel at the lowest effective power, guaranteed by the manufacturer, describes the minimum power mode. The minimum effective capacity of 10-20% of the nominal, is determined to reduce the limit ship's speed. Mode of minimally stable engine speed marine diesel engine determines the maneuverability of the vessel. In this mode, the energy resources of diesel used by 3-4% rated power and 30% of the nominal speed of the crankshaft. The duration of the diesel in this mode should not exceed 2-3 h. In addition to the standard modes, marine diesel engines can also work on modes of operating power and idling.

By operating power include high power diesel engine for the planned load and speed of the vessel. For cargo ships, it is 85 – 90% of rated capacity for towing – 90-95%. In determining the targets of the ship on the operational performance of diesel fuel consumption is normalized. Plants that are shipping the device for separation of the propeller shaft diesel engines can operate and at idle speed. Diesel operation in this mode is accompanied by significant non-uniformity of the fuel, and sometimes pass outbreaks in the cylinders, leading to carbon formation on the pistons, seals rings, valves, spray nozzles, and therefore the duration of idling must not exceed 0.25-0.5 hours in exceptional cases, related to the preservation of people or cargo, the watch chief may decide to inclusion in the work and faulty diesel engines. This mode of operation is called EMS emergency. Sometimes in an emergency mode of operation of diesel engines is provided if necessary for the craft to the point of repair. In this case, the watch chief (mechanic) must be organized under constant watch in the engine room to closely monitor the technical condition of the diesel engine.

Winter is coming and mountains of snow, I'm sorry for the tautology, not far off. Before many people get up to the actual problem to clear. A lot of people out of habit or ignorance, will wield the ancient farm implements – shovel. But the performance of this "devaysa", to put it mildly, does not hold water. Another thing is, special machinery – snow thrower, designed for productive work. One of the largest firms produce the highest category snow thrower is a U.S.

firm Craftsman. The product quality of the brand has long passed the test of time and millions of satisfied customers is a strong reason to. Range Craftsman snowthrower models is wide enough so that everyone could choose a model, based on their needs. But above all you should decide to order a snow thrower to choose – self-propelled or dumb. Choice depends on your needs. If you need a compact and lightweight device, then choose among the non-self, but if you want a high-assistant, who will master the daily hours of work, then you only need self-propelled.

We dwell in more detail on self-propelled models and see which manufacturer offers us a Craftsman. One good option for bulk and regular work is a snow thrower Craftsman 88 185. It has a capacity of 8.5 horsepower, width and height of the capture of 69/53 inches. In that case, if the volume that you need to master are a few other bands, then the model 88 553 Craftsman you is perfect. With a capacity of 11.5 horses, tall and width of 76/53 inches, and the engine of the leading manufacturer Briggs & Stratton, you are fully satisfied their need for snow removal. One good option is the model Craftsman 88 355. Horsepower in it a bit – 5.5, but the ratio width and height of the capture of more than 61/53 is not bad for the price (27 600 rubles). Craftsman Model 88 552 is very popular. Its capacity of 10.5 horses, width / height of capture – 76/53, all at a fairly reasonable price of 48 500 and causes its demand among the target group.