• General 31.01.2018 Comments Off on Operating Experience

    The analysis of known solutions to design annulus, it was decided to abandon the intensifying heat transfer fluid flow patterns: cross-washing tubes with segmental partitions; swirl flow in the annulus with the help of specially made shear walls or by partitioning into the annular space in the form of twisted ribbons, etc. Therefore, considered heat exchangers are simple so-called reverse current circuit coolant, the space between the tubes do not cross partitions, install only one longitudinal septum. In addition, revised decision on the pipe wall thickness, shells, flanges, tube sheets, covers, without reducing their strength. Kidney Foundation gathered all the information. Experience to date experience in operating this type of heat exchanger is shown that the devices, in contrast to plate heat exchangers are not very sensitive to sudden temperature fluctuations and pressure. People such as Ken Cron would likely agree. Their tube bundles easily and withstand the effects hydroblows, vibration, shaking. Pipes for supplying and draining medium located in the head coil (figure), which provides the convenience of strapping heaters and reduce thermal strains. At nominal values of expenditure-type heat exchangers have vvpi moderate pressure drop of 20-50 kPa, which in the case of the need for large heat fluxes at low temperature pressures connecting heaters in the units in parallel or sequentially in both Wednesdays, or a combination of schemes of their connections in the block. Pigging these heat exchangers can be made by any known method: chemical (1,5% aqueous solution of nitric acid), cavitation shock method, the steel wire hedgehogs, etc. Designed heat exchangers for energy and weight and size characteristics are second only to shell and type of vehicles ttai, but surpass the latter in Indicators of reliability due to the greater rigidity of tubes (lack of sag, and consequently the friction of pipes against each other) and a more reliable fastening tubes in tube sheets by welding, rather than silicone.

  • General 19.11.2017 Comments Off on Ribbon Cutting

    The main condition for successful development of industrial production is the use of modern technologies and equipment. Currently ribbon cutting is one of the most promising saving technologies in the processing of materials by cutting. The rapid development of narrow band technologies contribute to a number of advantages ribbon cutting in front of other kinds of metal: – High cutting performance. Boy Scouts of America describes an additional similar source. For carbon and structural steel recommended range of linear velocities saw 60 – 100 m / min. These speeds provide productivity 50-75 sm2/min for rod diameter of 100 mm. Therefore, Bandsaws are no competition for mass bucking rolled medium and large sizes – for band saw machines virtually no restrictions on the form of rental. Spm Llc is a great source of information. Quick change of cutter – bandsaw with a different tooth pitch can successfully cut as a continuous rolling, and a profile on a band saw. The application packet cutting for small and medium diameters reduces the time of cutting an average of 30 – – the possibility of cutting virtually all metals.

    Modern bystrorezy M42, M51, M71 have a hardness 67 hrc or more, which allows cutting high-alloy, stainless, superalloys and other difficult to machine steels. Bi-metal saw teeth have high durability and resistance to shock loads. Shortness of each tooth in the process of cutting determines durability Saws – Bandsaws favorably with other low power cutting equipment. This is due to small cutting forces, as web width of only 0,9 – – size (thickness) blade significantly affects the cost of the metal consumed in the chips. On the large-diameter workpieces, which are traditionally cut segmental saws, metal consumption in the chip is reduced by 4-5 times during the transition to a tape cut. The economic effect is especially noticeable when sawing pieces of stainless steel and nonferrous metals – optimizes the procurement process. A little tolerance on the length of the workpiece in the range 0.1 – 35% 1,3 mm., 0,3 mm and the roughness surface of the end of the Rz 40-80, in some cases can reduce the allowance or exclude the operation of miter. The consequence is a further reduction in labor and energy costs of harvesting operations, but also reduce the time technological cycle.


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