Issues regarding the use of dust explosion protection for IIc-type explosion-proof cranes
Thread Content
In my efforts to find information on dust explosion prevention, I found in Tomoaki Miyamoto’s book \"Gourd-Type Cranes\" that: \"IIC-class cranes are also suitable for areas with explosive dust and where the ignition temperature categories are 11 or 12. However, it is necessary to regularly remove the dust layer accumulated on the surface of the equipment’s casing during use, in order to avoid the risk of smoldering caused by an excessive thickness of this dust layer.\" I wonder which standard the above statement comes from? Which standard specifies that IIC cranes can replace dust explosion protection?
I wonder how the original poster understands it? Which of the above sentences indicates that “IIC cranes can replace dust explosion protection”? “At the same time, IIC-class cranes are also suitable for use in areas with explosive dust and in groups 10.11, as well as those with ignition temperature groups of 11 and 12. However, it is necessary to regularly remove the dust layer that accumulates on the surface of the equipment’s casing during use, in order to avoid the risk of smoldering caused by an excessive thickness of this dust layer. In my understanding, this means that IIC-class cranes can be used in areas with explosive dust and in groups 10.11, as well as those with ignition temperature groups of 11 and 12, but the dust layer on the equipment’s surface must be removed frequently to prevent smoldering risks
It’s written in Miyanamoto Tomo’s book, so I’m also confused
It also mentions Zone 11 and Zone 12, which indicates that they are of the oldest possible standard. The classification of dust explosion zones has long been changed to Zones 20, 21, and 22; gases and dust are also separated