The 3 conditions that must be met simultaneously for the scope of application in the \"Regulations on Safety Inspection of Fixed Pressure Vessels\"
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1.3 Scope of application These regulations apply to pressure vessels that meet the following conditions simultaneously: (1) The operating pressure is greater than or equal to 0.1 MPa (Note 1-2)； (2) The product of working pressure and volume is greater than or equal to 2.5 MPa·L (Note 1-3) ； (3) The medium contained is a gas, a liquefied gas, or a liquid whose maximum operating temperature is higher than or equal to its standard boiling point (Note 1-4). Note 1-2: Operating pressure refers to the highest pressure (gauge pressure) that the top of a pressure vessel may reach under normal operating conditions. Notes 1-3: Volume refers to the geometric volume of a pressure vessel, that is, it is calculated based on the dimensions specified in the design drawings (without considering manufacturing tolerances) and rounded off. Generally, the volume of the internal components permanently attached inside the pressure vessel should be deducted. Notes 1-4: When the medium inside the container is a liquid whose maximum operating temperature is below its standard boiling point, this regulation also applies if the product of the volume of the gas phase space and the operating pressure is greater than or equal to 2.5 MPa·L. The above are stipulated in the regulations. I would like to ask about what is stated in red font regarding work pressure: does the so-called normal work pressure refer to the actual work pressure after purchase and installation, or the work pressure specified to the manufacturer before purchase? For example, I want to purchase a storage tank with a required operating pressure of 0.2 MPa, and the manufacturer determines the design pressure based on this value. After purchase, the maximum operating pressure in actual use did not reach 0.1 MPa; for example, it was 0.08 MPa. May I conclude that this storage tank is a pressure vessel, but it is not within the scope of supervision?
It is the working pressure submitted to the manufacturer before purchase.
Everyone is now using TSG21-2016; your place still uses the parameters from the old regulations.
The operating pressure of 0.2 MPa is indicated on the equipment’s nameplate; it must certainly fall within the specified range for monitoring. The fact that the equipment does not reach 0.1 MPa during operation does not conflict with the requirement that it be within the monitoring range
Can it be understood this way: the user is purchasing pressure vessels that are subject to supervision, and they are used at reduced pressure in actual operation?
Since the design conditions have changed, why not modify the drawings and nameplates?
Yes, this is from before. What I mainly want to ask is about the concepts in the definition; the parameters can be ignored for now:D
It can be used as long as the pressure does not exceed the design pressure. The design is based on the parameters specified for manufacturing; since it is a pressure vessel, supervision and inspection are of course required
In other words, the pressure vessel is determined at the time of design, and no matter how it is used, even when operated at atmospheric pressure, it still needs to be registered?
Whether to press for registration is determined based on the conditions specified during the design phase; in your case, it seems there are sufficient design conditions available