Steam cylinders actually fall under the category of pressure vessels, yet many factories fail to obtain the necessary permits?
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Steam cylinders actually fall under the category of pressure vessels, yet many factories fail to obtain the necessary permits? The steam distribution cylinder is a relatively thin and long cylinder. According to the regulations on pressure vessels and the definition of simple pressure vessels, this cylinder falls under the category of pressure vessels; however, it does not meet the requirements for simple pressure vessels. Therefore, it is classified as a type of pressure vessel, requiring certification and regular inspections, as well as being subject to the regulations set forth for pressure vessels
Indeed, according to the definition of pressure vessels, steam separators fall under the category of pressure vessels; they must comply with relevant standards and regulations, and certificates as well as regular inspections are required. However, in reality, some companies may overlook this aspect and fail to obtain the necessary permits or carry out regular inspections; such practices pose significant safety risks. It is recommended that companies follow the requirements strictly to ensure safety throughout the production process. .
According to TSG21 classification, the causal relationship you mentioned is incorrect. Ph159 steam cylinders are commonly used without certification.
159: The inner diameter of the tube is 150, which is within the range
Tubes with a diameter of 159*5, when used as container shells, are not subject to the regulations regarding fixed capacity.
By saying that no permits are required, it doesn’t necessarily mean that no permits exist; a pipe with an inner diameter of 159 falling short of 150 is considered a pressure pipeline, and permits must be obtained for such pipes. In the case of a boiler room, the steam drum is likely to require a permit along with the boiler itself. Don’t fixate solely on one clause of the tolerance specifications; **there are many other related technical standards as well.
A φ325x8mm vessel is classified as a Class 1 pressure vessel upon leaving the factory; can it also have permits issued for it along with pressure pipelines once it reaches the end user? And the boiler connected is also a non-special boiler, what do you think?
It’s not that registration is not required, but rather that individual entities fail to carry out the registration process (to save money and effort)； If no accidents occur or none are detected, it’s fine; but if an accident does happen, it is a problem related to the management of special equipment by the using unit. Additionally, to determine whether it is a simple pressure vessel, one must refer to the manufacturer’s factory documentation (which includes the design, manufacturing specifications, and standards).
1. When classifying, follow TSG21: if the cylinder pressure is sufficient and the volume is adequate, classify it as I, II, or III. 2. Steam distributors used in boilers typically handle saturated steam; such devices cannot be treated as simple pressure vessels. Even without considering the type of steam, the temperature requirement alone is not met.
If it is a type of container, it can be certified together with the boiler; if the boiler does not require certification, then it needs to be certified separately.
Under normal circumstances, cylinder-type pressure vessels require certification. If it is part of a boiler setup, in some cases the auxiliary cylinders are included within the boiler and considered part of its header system; as a result, it becomes difficult to distinguish them when testing them together with the boiler. I have seen this situation in the past, but not in recent years