How are the gas cylinders of liquefied hydrocarbon samplers managed and inspected? Help needed

Thank you for the trust from the friend on floor 2. This type of liquefied gas sampling cylinder was used at my previous workplace; back then, the management was not strict, and no one suggested that regular inspections be carried out or anything of the kind. However, for containers of slightly larger size, as they are pressurized sealed containers, regular inspections are required to ensure safe use and the reliability of sample storage. Steel cylinders with a very small volume may not need to be considered as pressure vessels, as their small size results in a limited amount of liquefied gas stored within them, meaning that any leakage poses little hazard. If even excessively small liquefied gas storage containers are required to be inspected, some of our lighters would not be able to be used or sold properly, and there would also be problems with those small plastic bottles used for storing liquefied gas. But I really don’t know exactly which standards to follow; it’s definitely necessary to check the relevant standards or consult the so-called authoritative authorities.

Personally, I recommend managing it as a fixed-pressure vessel. Refer to the definition of fixed pressure vessels. I’m not sure if it’s right? Please discuss. My overly strict norms and standards are too complicated to understand; it’s even harder for foreigners to figure them out. . .

Regarding this, in my opinion, the issue can be addressed from a broader to a more specific perspective: start by looking at the Special Equipment Safety Law. The scope of special equipment specified in Article 2 is outlined in the \"Catalogue of Special Equipment.\" According to the latest 2014 version of this catalogue, pressure vessels are defined as follows: \"Pressure vessels refer to enclosed devices that hold gases or liquids and are subjected to certain pressures. They include fixed and mobile containers whose maximum working pressure is greater than or equal to 0.1 MPa (gauge pressure) for gases and liquefied gases, and whose maximum working temperature is greater than or equal to their standard boiling point; such containers also have a volume of 30 L or more, with an inner diameter (for non-circular cross-sections, this refers to the largest geometric dimension of the cross-section) of 150 mm or more.\" ； 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. ”According to this explanation, the volume of fixed and mobile containers must be at least 30 L; therefore, a gas cylinder with a volume of 0.4 L definitely does not fall under the category of fixed or mobile pressure vessels ； But if it meets the criteria for gas cylinders, it is still considered a type of gas cylinder; in other words, it is a special type of equipment. Once it has been determined whether this gas cylinder is a pressure vessel or not, then in accordance with Article 33 of the Safety Law, the entity using such special equipment must complete the registration process within 30 days before and after its use; therefore, registration is definitely required. Article 52 stipulates that the inspection and testing of special equipment shall comply with laws and administrative regulations, and shall be carried out in accordance with the requirements of safety technical specifications. Looking at the 14th edition of the \"Regulations on Safety Inspection of Gas Cylinders,\" this version specifies a volume range of 0.4 to 3000 L. Upon checking the 00th edition of these regulations, it was found that the volume range was also 0.4 to 3000 L. However, the 05th edition of the \"Rules for Registration and Management of Gas Cylinder Use\" did not include such a requirement, which indicates that at that time those gas cylinders were considered to require registration; yet their manufacturing and inspection processes did not have to comply with the \"Regulations on Safety Inspection of Gas Cylinders.\" As for the inspection of these gas cylinders, there are indeed no clear regulations specifying how it should be done. In my opinion, it is best to follow the relevant provisions in the \"Regulations on Safety Supervision of Gas Cylinders\" to avoid future problems.