【Daily Question 2019】Hydrogen production and hydrogenation section – Question No. 007

Water flushing involves using water to remove residual rust, slag, dirt, and debris from pipelines and equipment, thereby keeping these pipelines, valves, orifice plates, pumps, and other devices clean and unobstructed, and thus creating the conditions necessary for water transportation. Hydro-lifting is a training method that uses water in place of oil; it also involves conducting load tests on pipelines, pumps, equipment, towers, containers, heat exchangers, valves, and instruments, in order to assess the quality of their installation and their operational performance. This approach is suitable for meeting production requirements and lays a foundation for subsequent work. Precautions for the water flushing process include: ① Piping and equipment in hydrogen-related systems shall not be involved in water commissioning or water flushing; proper isolation measures must be taken ； ②Before flushing with water, valves that are prone to clogging such as those at the sampling points, on the instrument leads, level gauges, and connection valves should be closed. Once the equipment and pipelines have been thoroughly flushed, these valves can be opened for the flushing process ； ③All valves in the system should be closed before flushing; they should be opened only as needed to prevent leakage. During flushing, start with the pipelines before moving on to the equipment. The inlets of various containers, towers, heat exchangers, pumps, and other equipment must be sealed off to prevent unwanted substances from entering the equipment. Once the water quality is clean, these seals can be removed again ； ④When flushing pipelines with water, flush the main lines first and then the branch lines; longer pipelines should be flushed in sections ； ⑤When filling the tower and container with water, open the bottom drain valve and the top vent valve to prevent overpressure in the tower and container; close the drain valve once the water is clear. Then, starting from the top of the device, flush the connected pipelines gradually from top to bottom. When draining water from the tower or container, open the top vent valve to prevent the tower from becoming vacuumed.

Raw materials, water flushing of the low-pressure system and water circulation, as well as precautions: Water flushing involves using water to remove residual rust, slag, dirt, and debris from pipelines and equipment, thereby keeping these pipelines, valves, orifice plates, pumps, and other devices clean and unobstructed, thus creating the conditions necessary for water circulation. Hydraulic training involves using water in place of oil for operational drills, while also conducting load tests on pipelines, pumps, equipment, towers, containers, heat exchange units, valves, and instruments, in order to assess whether their installation quality and operating performance meet the specified standards and are suitable for production requirements, thus laying a foundation for subsequent work. Precautions for the water flushing process are as follows: ① Pipelines and equipment in the hydrogen-containing system and the rich gas system shall not be involved in the water testing or water flushing; proper isolation measures must be taken ； ②Before flushing with water, valves that are prone to clogging such as those at the sampling points, on the instrument leads, level gauges, and connection valves should be closed. Once the equipment and pipelines have been thoroughly flushed, these valves can be opened for the flushing process ； ③All valves in the system should be closed before flushing; they should be opened only as needed to prevent leakage. During flushing, the pipelines should be treated first followed by the equipment. The inlet flanges of various containers, towers, heat exchangers, pumps, and other equipment must be removed and covered to prevent debris from entering the equipment. The flanges can be reinstalled only after the water quality is clean ； ④When flushing pipelines with water, flush the main lines first and then the branch lines; longer pipelines should be flushed in sections ； ⑤When filling the tower and container with water, open the bottom drain valve and the top vent valve to prevent overpressure in the tower and container; close the drain valve once the water is clear. Then, starting from the top of the device, flush the connected pipelines gradually from top to bottom. When draining water from the tower or container, open the top vent valve to prevent the tower from becoming vacuumed.

Water flushing involves using water to wash away the rust, slag, dirt, and other debris remaining inside pipelines and equipment, thereby cleaning the pipelines, valves, orifice plates, and pumps

Water flushing involves using water to remove residual rust, slag, dirt, and debris from pipelines and equipment, thereby keeping these pipelines, valves, orifice plates, pumps, and other devices clean and unobstructed, and thus creating the conditions necessary for water transportation. Hydro-lifting is a training method that uses water in place of oil; it also involves conducting load tests on pipelines, pumps, equipment, towers, containers, heat exchangers, valves, and instruments, in order to assess their installation quality and operational performance. This ensures that they meet the requirements for production and lays a foundation for subsequent work. Precautions for the water flushing process include: ① Pipelines and equipment in the hydrogen-related systems and the rich gas system shall not be involved in the water testing or flushing; proper isolation measures must be taken ； ②Before flushing with water, valves that are prone to clogging such as those at the sampling points, on the instrument leads, level gauges, and connection valves should be closed. Once the equipment and pipelines have been thoroughly flushed, these valves can be opened for the flushing process ； ③All valves in the system should be closed before flushing; they should be opened only as needed to prevent leakage. During flushing, start with the pipelines before moving on to the equipment. The inlets of various containers, towers, heat exchangers, pumps, and other equipment must be sealed off to prevent unwanted substances from entering the equipment. Once the water quality is clean, these seals can be removed again ； ④When flushing pipelines with water, flush the main lines first and then the branch lines; longer pipelines should be flushed in sections ； ⑤When filling the tower and container with water, open the bottom drain valve and the top vent valve to prevent overpressure in the tower and container; close the drain valve once the water is clear. Then, starting from the top of the device, flush the connected pipelines gradually from top to bottom. When draining water from the tower or container, open the top vent valve to prevent the tower from becoming vacuumed.

Water flushing involves using water to wash away the rust, slag, dirt, and debris remaining inside pipelines and equipment, thereby cleaning pipelines, valves, orifice plates, pumps, etc.

Water flushing involves using water to remove residual rust, slag, dirt, and debris from pipelines and equipment, thereby keeping these pipelines, valves, orifice plates, pumps, and other devices clean and unobstructed, and thus creating the conditions necessary for water transportation. Hydro-lifting is a training method that uses water in place of oil; it also involves conducting load tests on pipelines, pumps, equipment, towers, containers, heat exchangers, valves, and instruments, in order to assess the quality of their installation and their operational performance. This approach is suitable for meeting production requirements and lays a foundation for subsequent work. Precautions for the water flushing process include: ① Piping and equipment in hydrogen-related systems shall not be involved in water commissioning or water flushing; proper isolation measures must be taken ； ②Before flushing with water, valves that are prone to clogging such as those at the sampling points, on the instrument leads, level gauges, and connection valves should be closed. Once the equipment and pipelines have been thoroughly flushed, these valves can be opened for the flushing process ； ③All valves in the system should be closed before flushing; they should be opened only as needed to prevent leakage. During flushing, start with the pipelines before moving on to the equipment. The inlets of various containers, towers, heat exchangers, pumps, and other equipment must be sealed off to prevent unwanted substances from entering the equipment. Once the water quality is clean, these seals can be removed again ； ④When flushing pipelines with water, flush the main lines first and then the branch lines; longer pipelines should be flushed in sections ； ⑤When filling the tower and container with water, open the bottom drain valve and the top vent valve to prevent overpressure in the tower and container; close the drain valve once the water is clear. Then, starting from the top of the device, flush the connected pipelines gradually from top to bottom. When draining water from the tower or container, open the top vent valve to prevent the tower from becoming vacuumed

Water flushing involves using water to remove residual rust, slag, dirt, and debris from pipelines and equipment, thereby keeping these pipelines, valves, orifice plates, pumps, and other devices clean and unobstructed, and thus creating the conditions necessary for water transportation. Hydraulic training involves using water in place of oil for operational drills, while also conducting load tests on pipelines, pumps, equipment, towers, containers, heat exchange units, valves, and instruments, in order to assess whether their installation quality and operating performance meet the specified standards and are suitable for production requirements, thus laying a foundation for subsequent work. Precautions for the water flushing process are as follows: ① Pipelines and equipment in the hydrogen-containing system and the rich gas system shall not be involved in the water testing or water flushing; proper isolation measures must be taken ； ②Before flushing with water, valves that are prone to clogging such as those at the sampling points, on the instrument leads, level gauges, and connection valves should be closed. Once the equipment and pipelines have been thoroughly flushed, these valves can be opened for the flushing process ； ③All valves in the system should be closed before flushing; they should be opened only as needed to prevent leakage. During flushing, the pipelines should be treated first followed by the equipment. The inlet flanges of various containers, towers, heat exchangers, pumps, and other equipment must be removed and covered to prevent debris from entering the equipment. The flanges can be reinstalled only after the water quality is clean ； ④When flushing pipelines with water, flush the main lines first and then the branch lines; longer pipelines should be flushed in sections ； ⑤When filling the tower and container with water, open the bottom drain valve and the top vent valve to prevent overpressure in the tower and container; close the drain valve once the water is clear. Then, starting from the top of the device, flush the connected pipelines gradually from top to bottom. When draining water from the tower or container, open the top vent valve to prevent the tower from becoming vacuumed.

Water flushing involves using water to remove residual rust, slag, dirt, and debris from pipelines and equipment, thereby keeping these pipelines, valves, orifice plates, pumps, and other devices clean and unobstructed, and thus creating the conditions necessary for water transportation. Hydraulic training involves using water in place of oil for operational drills, while also conducting load tests on pipelines, pumps, equipment, towers, containers, heat exchange units, valves, and instruments, in order to assess whether their installation quality and operating performance meet the specified standards and are suitable for production requirements, thus laying a foundation for subsequent work. Precautions for the water flushing process are as follows: (1) The pipelines and equipment in the hydrogen-related systems shall not be involved in the water testing or water flushing; proper isolation measures must be taken ； (2) Before flushing with water, valves that are prone to clogging such as those at the sampling points, on the instrument leads, level gauges, and connection valves should be closed. Once the equipment and pipelines have been thoroughly flushed, these valves can be opened for the flushing process ； (3) All valves in the system should be closed before flushing; they should be opened only as needed to prevent leakage. During flushing, the pipelines should be cleaned first, followed by the equipment. The inlet flanges of various containers, towers, heat exchangers, pumps, and other equipment must be removed and covered to prevent debris from entering the equipment. The flanges can be reinstalled only after the water quality is clean ； (4) When flushing the pipelines with water, flush the main lines first and then the branch lines; longer pipelines should be flushed in sections ； (5) When filling the tower and container with water, open the bottom drain valve and the top vent valve to prevent overpressure in the tower and container; close the drain valve once the water is clear. Then, starting from the top of the device, flush the connected pipelines gradually from top to bottom. When draining water from the tower or container, open the top vent valve to prevent the tower from becoming vacuumed.

Water flushing involves using water to remove residual rust, slag, dirt, and debris from pipelines and equipment, thereby keeping these pipelines, valves, orifice plates, pumps, and other devices clean and unobstructed, and thus creating the conditions necessary for water transportation. Hydro-lifting is a training method that uses water in place of oil; it also involves conducting load tests on pipelines, pumps, equipment, towers, containers, heat exchangers, valves, and instruments, in order to assess the quality of their installation and their operational performance. This approach is suitable for meeting production requirements and lays a foundation for subsequent work. Precautions for the water flushing process include: ① Piping and equipment in hydrogen-related systems shall not be involved in water commissioning or water flushing; proper isolation measures must be taken ； ②Before flushing with water, valves that are prone to clogging such as those at the sampling points, on the instrument leads, level gauges, and connection valves should be closed. Once the equipment and pipelines have been thoroughly flushed, these valves can be opened for the flushing process ； ③All valves in the system should be closed before flushing; they should be opened only as needed to prevent leakage. During flushing, start with the pipelines before moving on to the equipment. The inlets of various containers, towers, heat exchangers, pumps, and other equipment must be sealed off to prevent unwanted substances from entering the equipment. Once the water quality is clean, these seals can be removed again ； ④When flushing pipelines with water, flush the main lines first and then the branch lines; longer pipelines should be flushed in sections ； ⑤When filling the tower and container with water, open the bottom drain valve and the top vent valve to prevent overpressure in the tower and container; close the drain valve once the water is clear. Then, starting from the top of the device, flush the connected pipelines gradually from top to bottom. When draining water from the tower or container, open the top vent valve to prevent the tower from becoming vacuumed.

When purging the hydrogenation unit, the following points should be noted: ① When introducing the purge medium, ensure that the pressure does not exceed the design pressure； ②Purified air lines, non-purified air lines, nitrogen lines, circulating water lines, fresh water lines, steam lines, etc., shall all be purged using their respective media ； ③Cooling exchange equipment and pumps are not included in the purging process; those with bypass lines use those bypass lines, while those without bypass lines have their inlet flanges removed ； ④To proceed with the purging process, first purge the main lines, then the branch lines and related pipelines; purging should be carried out in segments as much as possible ； ⑤During steam purging, it is essential to first drain the condensate before introducing steam; the introduction of steam should be done slowly to prevent water hammer. When steam is introduced into the equipment, the top part should be vented while the bottom part should have its condensate drained. After the equipment has been thoroughly purged, each of the connecting process pipelines should be purged from top to bottom ； ⑥Purging must be repeated until the pipeline is clean. If necessary, the blasting and purging method can be employed. After purging, it should be completely drained to ensure no water remains in the pipelines. Raw materials, water flushing of the low-pressure system and water circulation, as well as precautions: Water flushing involves using water to remove residual rust, slag, dirt, and debris from pipelines and equipment, thereby keeping these pipelines, valves, orifice plates, pumps, and other devices clean and unobstructed, thus creating the conditions necessary for water circulation. Hydraulic training involves using water in place of oil for operational drills, while also conducting load tests on pipelines, pumps, equipment, towers, containers, heat exchange units, valves, and instruments, in order to assess whether their installation quality and operating performance meet the specified standards and are suitable for production requirements, thus laying a foundation for subsequent work. Precautions for the water flushing process are as follows: ① Pipelines and equipment in the hydrogen-containing system and the rich gas system shall not be involved in the water testing or water flushing; proper isolation measures must be taken ； ②Before flushing with water, valves that are prone to clogging such as those at the sampling points, on the instrument leads, level gauges, and connection valves should be closed. Once the equipment and pipelines have been thoroughly flushed, these valves can be opened for the flushing process ； ③All valves in the system should be closed before flushing; they should be opened only as needed to prevent leakage. During flushing, the pipelines should be treated first followed by the equipment. The inlet flanges of various containers, towers, heat exchangers, pumps, and other equipment must be removed and covered to prevent debris from entering the equipment. The flanges can be reinstalled only after the water quality is clean ； ④When flushing pipelines with water, flush the main lines first and then the branch lines; longer pipelines should be flushed in sections ； ⑤When filling the tower and container with water, open the bottom drain valve and the top vent valve to prevent overpressure in the tower and container; close the drain valve once the water is clear. Then, starting from the top of the device, flush the connected pipelines gradually from top to bottom. When draining water from the tower or container, open the top vent valve to prevent the tower from becoming vacuumed.