Gas pressure feeding issue
Thread Content
A provincial regulation from 10 years ago stipulated that for the transfer of materials between containers and for adding bulk materials, compressed air or vacuum should not be used; instead, portable pumps or fixed pumps must be employed for such transfers. Around 2020, this regulation was still in effect on the document cleanup list. https://bbs.hcbbs.com/thread-1430704-1-1.html lists that several standards such as SH3047 and GB13348-2009 contain similar provisions. In https://bbs.hcbbs.com/thread-1916660-1-1.html, nitrogen was supposed to be used for the pressure application system in a certain facility; the normal operating pressure was 1.5 kilograms of pressure. However, in practice, compressed air at 5.8 kilograms of pressure was used for this purpose, which led to an explosion. Two questions: 1. Can inert gas be used for pressing? 2. Is there any danger in vacuum material extraction? At present, there are still many projects and on-site tasks.
The fire hazard of the materials also plays a role; for materials of Class A that can even explode, using compressed air and vacuum does pose a significant risk. Those that are flame-retardant, non-flammable, and non-explosive should work
1. Using inert gases to hold down the material is an option. 2. Vacuum suction still cannot prevent air from coming into contact with the material, and it is difficult to keep the flow rate within the required levels; when the material is removed, air enters at high speed, posing a risk