Daqing Petrochemical Construction and Construction Company used the newly introduced four synchronous hydraulic wrenches for the first time on the overhaul platform of catalytic reforming unit F201/1 reactor cover. It is understood that for the first time, the company used a bolt and torque fastening technology for 950 static seal points and 21,000 bolts for high-temperature, high-pressure, and flammable media. It is understood that this is the largest time China Petroleum Bolt tightens.
It is understood that the correct control of the bolt tightening method and preload force has a significant impact on the safe production of the production plant. If the bolt pre-tightening force is too large, the gasket will be crushed to lose its elasticity, and even the bolt will be screwed off; if the pre-tightening force is too small, the remaining pre-tightening force on the gasket surface after compression will not reach the working sealing ratio. Pressure, which causes the connection system to leak. Daqing Petrochemical Construction Company adopts scientific bolting torque fastening technology, which can make the bolt preload force acting on the gasket evenly and symmetrically, so as to achieve a balanced and effective bolt load. The flange sealing is simple, high precision, and greatly improved Equipment maintenance quality ensures zero leakage of the device.
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1. When using new plastic, the remaining material of the screw should be cleaned. 2. When the temperature of the molten plastic is normal but black spots or discoloration of the molten plastic are constantly found, the rubber screw should be checked. 3. During processing, try to make the material plasticize evenly, and do not allow metal foreign matter to be mixed into the material to reduce the torque of the screw. force.
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