It's winter, how is your antifreeze work?

Please correct me if there is something wrong. First of all, all steam pipelines and instrument boxes need to be heated. Important instruments (such as gas drum pressure, conversion temperature, etc.) need to be added with 2 to 3 sets of heat tracing. Inform the on-site operators to drain all on-site diversion showers every half hour. On the steam pipe network, there are about 9 to 10 diversion showers in our factory that are not disconnected, and water is always being discharged. For pipes with relatively small diameters (1-inch pipes) such as phosphate pumps, either do not open them. If you want to open them, do not stop them. After it freezes, it becomes troublesome... During the shift, the pipelines are inspected, and the pipes on the pipe racks are inspected every 24 hours. (In our factory, an operator once forgot to check the residual liquid pipeline, which caused all the pipes with a total length of 420 meters to freeze. Eight people were assigned to blow them for 7 days, and the pipes were disconnected every 30 meters and blown with steam.) Insulation in the Northeast region basically needs to be done once a year, or only two layers should be maintained. The first layer is no longer usable at about minus 15 degrees. Also, a reminder, prepare pliers, No. 8 wire, hose, and oxygen belt (for blowing thin pipes) for the operator. The division of labor in our factory is basically that the instrument box and the frozen instruments within one meter of the instrument box belong to the operator, and the rest belongs to the operator. How shameless!

For pipeline valves that are prone to freezing, electric heating insulation, double accompanying pipe insulation, jacket insulation plus conventional rock wool insulation can be used. The jacket and accompanying pipe insulation should always check the return water. If there is poor water return, it should be dealt with in time and have a dedicated person to manage it. Only by taking preventive measures can normal production and production safety be ensured. Electric heating is a good way. It is also more economical and practical to use electric heating tapes, and it is easy to switch in summer. In pipelines that are prone to freeze-blocking, it is best to add a nozzle with a diameter of 20 in every other section, and blind the nozzle with a blind plate. When freeze-blocking occurs, the blind plate can be removed and the blockage can be blown with oxygen band steam.

Pipes and valves can be insulated, instruments can be heated with steam, discharged and directed in a timely manner, and electric heating can also be increased or decreased.

Bottom line, it's going to snow again recently, reminding people to pay attention to frost protection to avoid unnecessary losses.

All pipelines related to water media must be heated, and regular inspections must be carried out to ensure that the pipelines are unobstructed to prevent freezing! Especially in our northern region, antifreeze and insulation in winter is a very important thing to do during work! It is recommended that all operators must take the trouble to check frequently and solve problems promptly if problems are found. Don't make small things bigger and cause huge losses in parking! Because the heated pipes are frozen (heat mixing pipes are usually very thin), it is difficult to blow through!

For the temperatures this winter, our daily inspections can no longer meet actual needs. Problems will still arise. We hope they will all be safe. Have a peaceful winter!

1. When the temperature is low in winter, the high-carbon hydrocarbons in natural gas will condense into liquid and should be discharged in time. Frequently check the liquid level in the raw gas separator and the buffer tank in front of the heating furnace. If any liquid level is found, discharge it promptly. In principle, schedule every two hours, and schedule frequently at the beginning. If the quantity is large, use buckets. .2 Heating system activation The heating system of our device uses low-pressure steam, so leakage should be minimized to ensure the balance of the steam system. The heating system should have undergone a hydraulic pressure test. a. Check whether each steam valve is easy to use, otherwise repair or replace it. b. Confirm that the valves at each end of the heating steam line are closed. c. When introducing heating steam, pay attention to the condensation water discharged from each end valve. d. Check whether each heating wire is smooth (touch and feel the temperature). If not, deal with it in time. e. Put all instrument heating into use. 9.3 Antifreeze operations in each process 3.1 Antifreeze operations in conversion and hydrogen production processes a. Check whether each heating wire is smooth and usable. b. Open the anti-freeze line of each heat exchanger slightly and adjust it according to the temperature. c. Turn on the cooling water of each sampling cooler slightly. 3.2 Antifreeze operation in the compression process a. Reduce the time interval between compression and draining to prevent freezing. b. When shutting down in winter, use nitrogen to clean the compressor drain line. 3.3 Antifreeze operation in the synthesis process a. Check whether each heat trace is smooth and usable. b. Open the anti-freeze line of each heat exchanger slightly. c. The continuous and intermittent sewage discharge of the synthetic steam drum and the synthetic tower should be slightly opened. d. Turn on the cooling water of each sampling cooler slightly. .3.4 Antifreeze operation in the distillation process a. Check the pump body and cooling water of each pump frequently, and deal with any problems immediately if any problems are found. b. Check whether each heating wire is smooth and easy to use. c. The antifreeze lines of each heat exchanger are slightly open. d. Turn on the cooling water of each sampling cooler slightly. .4 General requirements for device antifreeze: a. The frequency of inspections in winter increases. Inspections must be careful and careful, and all antifreeze points that can be touched must be touched. b. The valve opened for anti-freezing should be adjusted frequently according to the temperature to avoid unnecessary waste. c. Depending on the temperature, replace the oil in each pump in time to ensure lubrication. 4.1 When operating the cooler in winter, the cooling water of the cooler must open the inlet and outlet connecting valves to prevent frost damage. ； When out of service, the inlet and outlet valves of the cooler must be fully closed, the blind plate must be opened, and the internal water should be blown away with wind. 4.2 Anti-freeze insulation of equipment in winter. Equipment that is out of service in winter, such as coolers, pipelines, and heating cables, must open floor drains to vent, purge them with steam, and then ventilate to remove accumulated water in the equipment. ； The equipment used should keep the medium flowing to prevent freezing. When draining water at a low point in the container, special attention should be paid to checking the frozen pipelines for leaking materials. 4.3 Antifreeze measures for pipelines in winter: a) For process water lines, if they are installed on the ground and the water consumption is not large, it should be ensured that there is a vent valve at the end of the pipeline to maintain constant water flow and prevent freezing. If possible, insulation should be added to the pipeline. b) Water lines that are used intermittently must be equipped with heating wires for heat preservation, otherwise they will not be usable. c) For water lines that are not used in winter, the flanges on both sides should be disassembled and all the water should be drained. If possible, purge with air to ensure that the water in the pipeline is not filled. If the switch is not tight, blind plates should be added to the disassembled flanges at both ends and registered. d) For some pipelines that are not used in normal production, such as start-up circulation lines, unqualified product lines, etc., due to long-term outage, there may be water in the dead ends and freeze. Once used, it will cause blockage and affect production. For such pipelines, before winter, the pipelines should be dredged and replaced with appropriate flow rates, and then the relevant valves should be closed and kept in a standby state. e) For pipelines whose process pipeline position is lower than the tank inlet position, the first valve at the root of the tank must be opened as soon as it is used, and closed promptly after use. It cannot be left open for a long time to prevent the water in the tank from pouring into the pipeline and causing freezing. f) For pipelines transporting water-containing media, it is necessary to appropriately turn down the cooling water of the cooler and increase the transport temperature. The determination of the temperature is determined by the process requirements of the transport destination, and try to ensure its continuity. In particular, it is necessary to prevent the flow rate from being large and small, and from large changes. g) For valve wells, water meter wells, etc. on the water line, antifreeze measures must be taken before winter, and the insulation manhole covers must be intact. h) For fire hydrants in the fire water line system, the valves must be closed and the water stored in the water hydrant must be drained to ensure that the water hydrant can be put into use at any time. .5 After freezing, steam or hot water should be used to thaw the frozen treatment equipment. Cast iron pipelines and equipment should be thawed slowly to prevent bursting. It is forbidden to heat cracked pipelines or equipment in a sealed state. The air should be opened first. Horizontal pipes should be thawed from low to high, and vertical pipes should be thawed from top to bottom. Any cracks should be reported.