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The World and Modern Science

  • Heavy Grades

    Filed under News
    Oct 4

    The composition of heavy fuels are mechanical impurities, salt, water, etc. In the operation of the engine on heavy fuel oil it contains heavy particles can cause increased wear of fuel system components, and CPG. Considerable amount of water in the fuel can lead to some breaks in the combustion process and even to stop a diesel engine. Therefore, the use of heavy fuel oil in diesel plants is allowed under special devices for heating and cleaning, as well as special (alkaline) lubricating oils. Before using heavy fuel properly prepared, that is of paramount importance to ensure reliable, uninterrupted and cost of diesel. For normal operation the fuel in reserve, settling and service tanks, before filters, separators and nozzles heated to a temperature that provides the desired viscosity.

    Temperature limit for fuel in the tanks, reported to the atmosphere, should be not less than 15 below the flash point in closed crucible. Viscosity, which provides ease of pumping of fuel, should be 57-120 VU; heating temperature of heavy fuel for a given viscosity is given in Table. 1. In the settling tank and supplies the fuel temperature rises to 50-65 C. Before entering the fuel separator additionally heated to reduce its viscosity (up to 2-6 VU). Ship electrical separator should have special protection from the fuel vapor. The viscosity of separated fuel coming to the nozzles of diesel should be not more than 3,5-4 VU (maximum, permissible). At higher viscosity excessively increases pressure in the atomization that can result in damage to parts of diesel.

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  • Class Machines

    Filed under News
    Sep 1

    Providing high accuracy and reliability of the CNC machine during operation due to system maintenance, timely and quality execution of preventive maintenance and repair. Service CNC includes organizational and technical measures to ensure monitoring of machines and devices, machines and their supporters in the output parameters for a given level over a period of operation. K These include: inspection and condition monitoring, cleaning, washing and lubrication mechanisms of the machine, refill the oil, the regulation mechanisms of the machine and control system components, replace worn parts and the failed units CNC system, testing and commissioning of hydro-electric and, work on troubleshooting. Maintenance must be conducted in accordance with general rules, as well as to meet the requirements defined documentation tools. A leading source for info: Rob Daley. The general rules are requirements for the premises where the machines installed, the mounting of machines and devices, CNC. CNC Class N (normal accuracy), and machines of class II (high accuracy) are installed in closed heated facilities machine shops. Machine tools, machining parts abrasive tool (grinding), or machines that handle dusty material (eg, iron, wood) set in an isolated room, which provided the conditions for air cleaning and removal of abrasive and metal dust.

    In machine shops where the machines are installed, there should be protection of air from external contamination. For CNC devices must be used individually ventilation. Low space for the machines of the classes H and L must be equal to 20 5 C. Relative humidity in the room with CNC should be no more than 80%. . See 4Moms for more details and insights.

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