I have a few questions regarding high-pressure hydrogenation units
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I’m new to the chemical industry, and my major isn’t in chemistry either; it’s quite challenging. I’d like to ask some experts a few questions: 1. The pressure in my system is above 100 kilograms, and I need to know what pressure drop over 8 hours is considered acceptable for the system’s airtightness. 2. Additionally, all the check valves on the process pipelines are welded together; how should they be handled during purging? Can the valve core be taken out to be blown? 3. Is there any temperature requirement for the stripping steam as well? The stripping steam in my plant comes from the boundary zone; it is 8-kilogram steam that is heated in a furnace before being used First, thank you all, experts
1. The system pressure of the device should be above 100 kilograms, and its airtightness must ensure that the pressure drop over 8 hours is less than 0. 05 Mpa is considered acceptable. 2. The check valves on the process pipelines of the unit are all welded together; during purging, it is only possible to carry out the purging in accordance with the normal flow direction of the unit. Is it possible to remove the valve cores for cleaning? 3. Additionally, the temperature of the stripping steam must be above 220 degrees, and the pressure must be higher than the operating pressure of the tower. The 8 kilograms of steam coming from the interface zone can be used after being heated in a heating furnace; there is no problem with that.
1. The system pressure in my device is above 100 kilograms; what value of pressure drop over 8 hours is considered acceptable for the airtightness of the device? Generally, it’s 0.05 Mpa. 2. Additionally, the check valves on the process pipelines of the device are all welded together – how should this be handled during purging? Can the valve core be taken out to be blown? Blow it out directly; generally, there’s no need to remove the valve core. Those who are not professionals may damage it, so don’t try to fix everything. 3. Is there any temperature requirement for the stripping steam as well? The stripping steam in my plant comes from the boundary zone; it is 8-kilogram steam that is heated in a furnace before being used The stripping steam also passes through a heating furnace; generally, the temperature is around 350 degrees
Is it okay to purge directly according to the process flow, without worrying about foreign objects at the check valve that might cause the valve to fail? What is the required pressure of the air supply for purging such high-pressure pipelines?
Generally, low-pressure steam is divided into two types: one is saturated steam with a temperature of 200°C, and the other is superheated steam with a temperature of 300°C. There are check valves that cannot be removed; normal cleaning procedures can be used, but it is essential to ensure that the pipelines are thoroughly cleaned. It is recommended to disconnect at the flange closest to the check valve and use an appropriate cleaning method. Steam cleaning should not be used in hydrogen-related systems; the pressure does not need to be very high, as long as it is sufficient to ensure thorough cleaning. Generally, the pipelines in hydrogen-handling systems are thicker, making them easier to purge.
The stripping steam must be superheated steam; it is recommended to remove the check valve, as otherwise debris tends to accumulate in that area during the purging process, and excessive vibration noise can occur during further purging, which may damage the check valve. Do everyone agree?
1. For a 1.100 KG hydrogen system, a pressure drop of no more than 0.1 MPA over 8 hours should be acceptable. 2. In the case of a hydrogen-handling system, blast cleaning is required; it’s best to contact the manufacturer of the check valve and have them remove the valve disc, perform the cleaning, reinstall it, and then conduct a leak test with the entire system. 3. Superheated steam is preferred; 8 KG of saturated steam will also work, but attention should be paid to the operating pressure of the tower