What is the combined operation of low-temperature methanol washing?

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First of all, it should be noted that the functions and purposes of water washing and water-based commissioning are different. Water washing is primarily used to remove impurities from the equipment, such as rust and slag. On the other hand, water-based commissioning involves using water instead of methanol as the medium for testing the equipment/electrical systems/instruments after water washing, in order to adjust them. During water-based commissioning, all instruments must be properly installed; attention must also be paid to the range of the instruments and electrical pumps, as well as the load during this process (since the densities of water and methanol differ, using the methanol flow rate for water-based commissioning can damage the instruments and pumps). Filters must also be installed during this process and cleaned regularly. Below are the details regarding water-based commissioning and water washing for the initial startup of our plant; the procedures may vary depending on the process (4-tower process), but I hope this information can be helpful to you. Water washing plan for the methanol washing section: I. Regulations for water washing: (1) Cleaning of all equipment must be carried out before water washing. The water washing procedure can be carried out only after the system has been purged and all moving equipment has passed individual tests. (2) Before washing, the stability of the pipe supports and hangers should be checked, and reinforcement should be carried out if necessary. (3) The order of water washing should be main pipes, branch pipes, and drainage pipes in sequence; the dirt washed out by water must not enter the pipes that have already passed inspection. All the drainage branches of the pipeline should be flushed. (4) The dirty liquid discharged after cleaning must not contaminate the environment; dumping it anywhere is strictly prohibited. The discharged water should be directed into reliable drainage wells or ditches, and no negative pressure shall be created during drainage. A no-entry zone should be established during washing. (5) After the pipeline has been washed and restored to its proper condition, no other operations that could affect the cleanliness inside it shall be carried out. After the equipment and pipelines have passed the water flushing test, the water inside them should be drained completely and dried promptly. (6) The water flushing should be carried out continuously, and it is considered successful when the color and transparency of the water at the outlet are visually consistent with those of the water at the inlet. II. Setup of the water source for washing: Regarding the water source used for washing, Tower C2605 utilized an independent washing system during this cleaning process, with fire hoses being used to deliver fire water to the top of Tower C2605 for rinsing; no further explanation will be given for this approach. The water washing sources for the remaining towers, tanks, and pipelines can be located at the following three sites depending on the actual conditions: (1) At tank V2604; since a large amount of water is required, fire water and deionized water can be introduced into tank V2604 simultaneously, and its level gauge can be used. (2) At the manhole of the lower tower in C2603, introduce fire-fighting water into this manhole and activate its level gauge. (3) At the V2607 manhole, introduce fire-fighting water into it and activate its level gauge. III. Preparation for water washing: Ensure that all valves within the area are closed. Open the manhole cover at the top of V2604, and introduce the fire hoses into V2604, V2607, and C2603 via the manhole into the lower towers. Remove the inlet strainer caps from the P2601A/B, P2602A/B, P2603A/B, P2604A/B pumps and extract the strainers. Connect the inlet strainer heads of pumps P2601A and P2603B with temporary piping (4"). Remove the heads of S2602A/B, S2603, and the two methanol spray filters, and extract the filter screens. Open the side manhole covers of V2602, V2603, and V2607, as well as the manhole cover of the lower tower at C2603. Remove the flow orifice plates of FT2605 and FT2601, and then reset their flange connections. Disconnect the following flanges: a, flange from P2601 pump to the shell-side inlet of E2608 ； b、Flange from E2608 shell side to inlet of E2606 shell side ； c、P2602 pump to E2607 shell side inlet flange ； d. S2602 filter to E2609 shell side inlet flange ； e. Two flanges from the E2606 tube side outlet to tower C2601 ； f. Flange from the shell side of E2609 to the inlet side of E2610. Remove the following drain blind plates and install shields at the flange connections of their V2608 pipelines: ① The drains for units V2604, V2602, V2603, V2607, C2601, C2603, C2604, E2606, E2607, E2608, E2609, E2610, S2602A/B, and S2603. ② Inlet drain for pumps P2601A/B, P2602A/B, P2603A/B, P2604A/B. ③ Pre-wash spray for the methanol filter. ④ Drain for pipelines MD2642-11/2", MD2626A-11/2", MD2609-11/2", MD2607-11/2", MD2610-11/2", MD2603-11/2", MD2604A-11/2", MD2613-11/2", MD2628-11/2", MD2612A-11/2", MD2627A-11/2", MD2614-11/2", MD2616-11/2", MD2625-11/2", MD2676-11/2", MD2650-11/2", MD2624-11/2", MD2660-11/2". IV. Water washing: (The water washing procedure is shown in the attached diagram.) (1) Flushing from V2604 to C2603: Open the inlet valves of pumps P2604A/B and the drain valve of V2604, and introduce DW and fire-fighting water into tank V2604 to flush it. After confirming that the flushing is satisfactory, close the inlet valves of pumps P2604A/B and the drain valve V2604; contact the personnel responsible for sealing the inlet strainers of pumps P2604A/B, install the strainers, and fill vessel V2604 with water. The V2604 level gauge is put into use; once the liquid level reaches over 80%, the P2604A pump is started as required. The outlet valve of the pump is opened by 5–6 turns, and the FV2605 bypass valve is used to control the amount of water used for flushing. It is important to monitor the operation of the P2604 pump as well as the level in V2604. In case of any abnormalities, the pump should be stopped immediately. During the flushing process, the P2604A/B pumps should be used alternately. When water flows through various equipment and pipes, open the various drain points, analysis points, and pressure sampling points for flushing, and then close them. At the same time, attention should be paid to venting air as the water flows through the heat exchanger. After flushing E2606 is complete, the flange is returned to its original position. The inlet and outlet stop valves of PV2608 are opened and set to 0.8 MPaG to enable automatic operation; then the nitrogen filling valve C2601 is opened to pressurize the high-pressure system. When flushing tower C2601, the fluid is first allowed to flow from the upper part of the tower through the LV2602 bypass valve into V2603. Once it is confirmed that the quality of the fluid flowing out of V2603 is satisfactory, the LV2602 bypass valve is closed. Open the bypass valves of FV2603 and LV2603 to flush the equipment and pipelines from tower C2601 down to V2603. After confirming that the water quality is satisfactory, close the LV2603 bypass valve. After confirming that tanks V2602 and V2603 are clean, seal the manholes of tanks V2602 and V2603. When sealing the manholes of vessels V2602 and V2603, the methanol spray line was flushed through the HV2602 bypass valve; after the flushing was completed successfully, the HV2602 bypass valve was closed and the heads of the methanol spray filters (2 units) were sealed. After the manholes of tanks V2602 and V2603 are sealed, open the upstream and downstream shut-off valves of PV2603-2, set the pressure to 0.5 MPaG and switch to automatic mode, then open the nitrogen filling valves of tanks V2602 and V2603 to fill them with nitrogen. After V2602 and V2603 have been pressurized, open the inlet valves P2601A/B, and adjust the opening degrees of the bypass valves LV2602 and LV2603 as well as FV2603 to flush the upper column of C2603; the flushing water is discharged at the filter screen at the inlet of pump P2601B. After confirming that the quality of the flowing water is satisfactory, contact the inlet filter head of pump P2601B to seal it and install a filter. (2) Flushing from pump P2601A to tank V2607: 1. Fill tower C2603 with water, and use a temporary pipeline to allow the water to reach ahead of pump P2601A. 2. Start pump P2601A as required to flush the pipeline from pump P2601A to the inlet flange on the shell side of E2608. After passing the inspection, the P2601A pump will be operated in circulation as appropriate, and the flange will be reset. 3. After reset, flush the shell side of E2608 up to the inlet flange of the shell side of E2606; once it is satisfactory, contact the team responsible for flange reset. 4. Once the water enters tank V2607, stop pump P2601A and close the pump outlet valve. 5. Flush all pipeline equipment from the P2603 pump to the V2604 tank using the same method. (3) Flushing from V2607 tank to C2603 tower: Flush according to the water washing route using the same method. Note: Once the flushing water for each section is connected to the water source, their flanges can be joined together, the manholes can be sealed, and flushing with water can be carried out. It depends on the specific circumstances on site. V. Tasks after washing: Restore the removed manholes and flow meter plates to their original positions, close the shut-off valve of the DW pipeline feeding V2604, and remove all fire hoses from various locations. Pressurize the system to keep the pressure in tank V2604 at 0.05 MPaG, after which automation is activated. The pressures of the remaining towers and vessels are adjusted to around 0.2 MPaG and set to automatic mode. Confirm that C2604 and C2605 are isolated. (C2605 rinse separately) After the system is pressurized, each drain valve is opened one by one to drain the water from the system. When no water is discharged from each drain valve, close all the drain valves; the system’s drainage is then complete, and the towers are maintained at the aforementioned pressure using nitrogen. Methanol washing combined operation plan (I): Commissioning 1.1 Pre-commissioning inspections, verifications, and preparatory work: (3) The equipment used to operate the system should be in a powered-off standby state (for safety reasons, power is supplied only after startup). The public utility facilities within the site meet the following requirements: Nitrogen: N2 – Pressure: 5.8–6.0 MPaG; Purity: 99.99%. N3 – Pressure: 0.4–0.5 MPaG; Purity: 99.99%. CW – Pressure: 0.42 MPaG; Temperature:

When is water intermodal transport most suitable to use?

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Water circulation is generally carried out before the system is initially started up, mainly to test the interlocks and observe the operation of the pumps, as well as to clean impurities from the system