The operation certificate of special equipment needs to pass the national examination certification before issuing the certificate, and the annual inspection is carried out according to the specific type of work, ranging from 2 to 3 years. If I am in the company, the research should be no problem, simple and not too strict, because I also passed the special operation certificate of two-stage autoclave oxygen pressure acid leaching pressure vessel in a state-owned enterprise. I only trained for one morning and took the test the next day. The examiner asked several questions. Later, I got the certificate inexplicably. It says that I have to have a physical examination every two years. Don't worry. You can register online or consult through the personnel department of the unit (this is more worry-free). Others like welders, fitters and riveters are very simple and basically the same.