What department adds odorant to liquefied gas?

Gas storage in refineries and petrochemical plants. You can also stink at the first-class station or the second-class station. Civil gas must be odorized, but it does not have to be odorized at the factory. Some industrial gases are odorized and some are odorless to supply some special industrial customers who don't need odorization. For example, Zhuhai Xinhai energy supplies odorized and odorless liquefied gas, and individual industrial users stipulate not to odorize it.