Does an enamel kettle with a jacket qualify as a pressure vessel?
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I know that enamel reactors with jackets are generally considered pressure vessels, but does this classification apply to the entire reactor or only to the jacket (the pressure inside the reactor body is less than 0.1 Mpa)? In other words, if I only make an opening above the kettle body, with no connection to the jacket, does this count as maintenance of a pressure vessel?
Standard A1.3.2 stipulates that for multi-chamber pressure vessels, the highest category among all the pressure chambers determines the category of the vessel, and it should be used and managed according to that category. According to this rule, your situation falls under the category of pressure vessel repair.
Your understanding is incorrect. What’s most important is to consider the medium involved; for example, if there is a sodium chloride solution at 0.1 MPa inside the tank and water at 7°C at 0.2 MPa in the jacket, then it isn’t considered a pressure vessel. But when steam is present in the jacket, it becomes a pressure vessel. You need to properly understand those three conditions related to pressure vessels.
The asked enamel kettle with a jacket falls under the category of pressure vessel maintenance, and it is necessary to determine whether inspection is required.
Aren’t all pressure vessels regulated?
The regulation referred to here means whether the special inspection agency issues a certificate
The term \"pressure vessel\" has two meanings: First, it refers to vessels that are subject to regulation under the \"Law of the People’s Republic of China on the Safety of Special Equipment\" and the \"Regulations on the Supervision of the Safety of Special Equipment.\" According to the catalog of special equipment issued by the Quality and Technical Supervision Bureau, a pressure vessel is defined as a closed device used to hold gases or liquids and that is subjected to certain pressure; such vessels include fixed and mobile containers whose maximum working pressure is 0.1 MPa (gauge pressure) or higher for gases and liquefied gases, and whose maximum working temperature is equal to or higher than their standard boiling point, as well as containers with a volume of 30 L or more and an inner diameter of 150 mm or more (for non-circular cross-sections, this refers to the largest geometric dimension of the cross-section)； Gas cylinders, liquefied gas cylinders, and cylinders for liquids with a standard boiling point of 60°C or lower, whose nominal working pressure at full charge is greater than or equal to 0.2 MPa (gauge pressure), and whose product of pressure and volume is greater than or equal to 1.0 MPa•L ； Oxygen chamber. ”2 refers to pressure vessels within the scope specified by the ‘Pressure Vessels’ standard.
The \"Rules for the Use and Management of Special Equipment\" TSG08-2017 provides detailed provisions on supervision and management
I was too pragmatic in my understanding; I assumed by default that anything not under regulation wasn’t a pressure vessel, ignoring the basic concepts. Thank you