Seek precautions for the start-up of chemical production facilities

You should explain what that device of yours is; different devices vary greatly.

1. Precautions for hydrogen gas tightness: (1) When the lowest wall temperature of the reactor is below 135°C, the reactor pressure shall not exceed 3.5 MPa； (2) The heating rate shall not exceed 20°C/h, and the pressure increase rate shall not exceed 1.5 MPa/h ； (3) When pressure release is required during the hydrogen gas airtightness testing phase, the hydrogen gas to be released must be sent to the flare system ； (4) When dealing with leaks during the hydrogen gas airtightness testing phase, fire-fighting equipment as well as steam and nitrogen for protection must be provided in accordance with regulations, and relevant safety procedures must not be violated during the operation ； (5) If a leakage point is detected during the pressure testing, the system pressure must be reduced to below 2.0 MPa before dealing with the leakage, after which the pressure should be raised back to its original level for further testing ； 2. Precautions for purging: (1) Whenever purging pipelines or equipment, care should be taken to discharge condensate when using low-pressure steam, in order to prevent condensed water from entering the downstream pipelines or equipment ； (2) When purging to the lowest points of pipelines, towers, or containers, proper drainage of condensate at the bottom is required ； (3) When introducing steam into the tower, it is essential to drain all the condensate first, and then slowly introduce steam into the tower to warm it up. Once steam begins to emerge from the top discharge outlet of the tower, gradually increase the opening of the steam valve; however, care must be taken to avoid knocking over the tray plates ； (4) During purging, the pressure rating of pipelines and equipment must be taken into account to prevent overpressure ； (5) When blowing in steam, a dedicated person should be stationed at the discharge outlet to prevent others from being burned by the steam ； (6) Isolate the system with a valve or blind flange before airtightness testing. Note that the through-holes or exhaust valves on the side that is not subjected to a gas-tightness test must be open, to prevent accidents caused by pressure leakage due to the valves not closing properly ； (7) After installing the pressure gauge, if its indication scale does not reach 1.5 times the test pressure, it must be replaced ； (8) During the pressure testing of one side of the heat exchanger equipment, the other side must be kept open for venting, to prevent leakage at the tube bundle joints or the head flanges ； (9) In the event of a leak during pressure testing, repairs must not be carried out while under pressure ； (10) During the airtightness test, organize personnel to check the specified areas according to their roles, ensuring that no single airtightness point is overlooked, and keep proper records. Unified command is required; as each step is carried out, the systems at the front and back must strengthen communication and work closely together. 3. Precautions during cold oil circulation: (1) The indication that cold oil circulation is complete is that the instruments are functioning properly, no free water can be drained from the various low points, and the oil is clean with no impurities ； (2) There must be a dedicated person on site to monitor the operation of each pump, prevent the pumps from running dry, and handle any abnormalities that may occur in a timely manner ； (3) When cutting off water at the low point, it is essential to be careful: cutting must be done properly to ensure that there is no oil leakage, no spillage of oil, and no cross-contamination of oil. 4. Precautions during catalyst drying: (1) Hydrogen is not used as a drying medium in this scheme; in particular, hot hydrogen at temperatures above 150°C must not come into contact with the oxidized catalyst, and hydrogen leakage into the system is strictly prohibited ； (2) Strictly control the heating rate to prevent a large temperature difference between the upper and lower layers of the reactor; otherwise, the catalyst in the lower layer may absorb the descending water vapor, leading to damage to the catalyst ； (3) The oxygen content in the system must be carefully analyzed to ensure it is below 0.5%; otherwise, the system needs to be refilled with appropriate gas before heating can proceed ； (4) After the circulating hydrogen compressor K-7101 is started and the system gas circulation stabilizes, activate the purge lines for the differential pressure leads of R-7101, R-7102, and R-7103. Once everything is operating normally, activate the differential pressure measuring instruments for R-7101, R-7102, and R-7103, and pay close attention to the bed pressure drops of R-7101, R-7102, and R-7103.

It was the commissioning of a coking plant; the main equipment included primary coolers, electric tar removers, fans, ammonium sulfate saturators, ammonia vaporization towers, direct-cooling final coolers, and benzene washing towers

There are many startup plans available online; you can download them to learn from.