Oil pump use and maintenance 1, new or long-term unused pump, with a 500-volt megohmmeter out of the box to measure all live parts and may touch the insulation resistance between metal parts, near the operating temperature should not be less than 7 Megohm. 2, the pump before use, to check the terminals are solid, ground wire must be reliable and solid. 3, check the power supply voltage is consistent with the rated voltage, can not exceed or lower than the rated voltage of 10% of the power used. 4, the use of pump, do not damage the wires, to avoid water, oil into the motor, switches, electrical parts. 5, the pump is prohibited in the conditions containing flammable and corrosive gases to ensure safe production and the normal operation of the electrical original. 6, pumping oil pump in use if found abnormal noise, should immediately shut down, check the reason, until you try to exclude the rear can continue to use. 7, the pump should not be empty run, when used aspiration immediately stop pumping, because the electric pump motor no-load speed of up to 10000 rev / split, otherwise it will be worn, the joint impeller, serious damage to the pump tube . 8, pumping pump replacement brush: brush wear can not be used immediately replaced, otherwise it will damage the commutator, will seriously burn the motor. 9, pump should be regularly inspected, not as at least three months to check once a month, often used should be overhaul once, overhaul should be fully open to eliminate internal dust, oil. If the commutator too much carbon can be used alcohol scrub commutator surface. If damaged parts should be replaced by the same parts. 10, pump not placed in dry, clean non-corrosive gas environment.
The hardness and density of tungsten are applied in obtaining heavy metal alloys. A good example is high speed steel, which can contain as much as 18% tungsten. Tungsten's high melting point makes tungsten a good material for applications like rocket nozzles, for example in the UGM-27 Polaris submarine-launched ballistic missile. Tungsten alloys are used in a wide range of different applications, including the aerospace and automotive industries and radiation shielding.Superalloys containing tungsten, such as Hastelloy and Stellite, are used in turbine blades and wear-resistant parts and coatings. Quenched (martensitic) tungsten steel (approx. 5.5% to 7.0% W with 0.5% to 0.7% C) was used for making hard permanent magnets, due to its high remanence and coercivity, as noted by John Hopkinson (1849 - 1898) as early as 1886. The magnetic properties of a metal or an alloy are very sensitive to microstructure.
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