Under the careful organization and coordination of the ten construction company project departments, after two hard-working 20-day maintenance of the youth commandos, by January 4, Sinochem Quanzhou Petrochemical's 3.4 million tons / year catalytic cracking unit overhaul 76 heat exchangers Pulling, loading is completed, pressure test completed 91%.
The heat exchanger overhaul difficulties, ten built on the careful planning arrangements, a total of 60 people into 8 disassembly team, maintenance work schedule to the day responsibility to the people, as the device running for 3 years and 8 months, subject to high temperature High pressure, heat exchanger bolts rust solid, especially in the four distillation zone fractional slurry steam heat exchanger, each with 170 sets of bolts, which have tar, the external coarse bolts like rust dead, electric wrench disassembly is not Move, only manual disassembly, maintenance personnel put a wrench after the drop hit the bolt does not move, but the hammer shaking the old, wrench difficult to control, in this case, they use the more successful overhaul disassembly, Is to pull the handle down the chain tighten the demolition wrenches, a person responsible for tightening the chain, two people turn into battle with a sledgehammer hit the handle, the bolt touches the chain taut once, so that since the security can not afford a wrench. Overhaul of youth commandos struggled for 11 days, the safety of the completion of the first 76 head heat exchanger removal, core heat exchanger tasks, and by the end of December and successfully completed the heat exchanger core refill.
Ten built on the quality of the heat exchanger back to install a serious attention to seriously test the quality of the core back to the loading pressure .In the backpack, the organization of maintenance personnel to carry out heat exchanger backpack quality training, so that we clear the process of each A process step, technical requirements and quality standards to ensure that the sealing surface of the heat exchanger smooth, gaskets placed properly, in accordance with the provisions of the boiler plate symmetrically uniform force fastening bolts, etc., especially in the heat exchanger after the repackaging process , The pressure test personnel carefully examine the heat exchanger tube bundle each nozzle, there is no pipe perforation caused by test pressure water outflow, leakage immediately found in accordance with the requirements of the workshop closure, all leaks after the completion of the blockade pressure test until qualified .
To January 4, heat exchanger pressure test completed 69 units, of which 13 pressure test plugging, the maintenance team is stepping up the construction of the remaining heat exchanger to ensure that all heat exchangers completed on schedule by January 8.
