By Laszlo Molnar, Manufacturing Manager at Aegex Technologies Picture this: A maintenance manager at an oil refinery is making his weekly rounds to check for any maintenance issues that may need service or repair. His main concern is equipment inside a highly explosive zone of the facility – a C1D1 (or ATEX/IECEx Zone 1) hazardous area. He notices a certain valve in this area looks faulty. He touches it and realizes it is loose. To document and report this, he can do one of three things: