Air separation equipment maintenance

Before starting, the following preparations should be done first: 1) Check whether the unit has the starting conditions (including the reason of last stop and the condition of overhaul; check whether there are obstacles around the unit; whether the starting tools, listening needles, recording tables and so on are ready); 2) Check whether the motor, electric, instrument and lighting signal are normal, especially whether the accident chain system can act correctly (including water break, low oil pressure, axial displacement, etc.); 3) oil supply lubrication system is normal (fuel tank oil level, fuel tank bottom whether the water, auxiliary oil pump and oil circuit normal); 4) conditions of cooling system and cooling water (including whether the cooler valve is flexible, water supply pressure and water volume, etc.); 5) whether various valves are flexible and easy to use, and whether they can be closed or opened as required; 6) turn the wheel before starting, check whether the rotatin...

1. It is easy to produce air hole when the flux is wet 2. If the welding speed is too fast, it is easy to produce welding porosity 3. Welding gas hole caused by welding wire rust or oil stain 4. The welding seam has rust, oxide film, grease and other organic impurities, resulting in welding porosity 5. It is easy to produce air hole when welding with improper polarity 6. Welding porosity caused by flux contamination 7. Insufficient height of flux is easy to produce welding porosity 8. If the height of flux is too high, the gas is not easy to escape and the welding porosity is easy to be produced