Container classification problem

The heat exchange area should be around 500 square meters; with such a large area, the diameter and length of the container will inevitably be significant. Formaldehyde is a highly hazardous substance, and the poster didn’t specify whether it refers to the maximum operating pressure. If that’s the case, it would likely fall under category three containers. Of course, further calculations are needed based on the actual dimensions.

The operating temperature is already above the boiling point of formaldehyde, which is -19.5°C; it should therefore fall under regulatory control

In the **Regulations on the Safety Supervision of Pressure Vessels**, pressure vessels are classified into two categories: those under supervision and those not under supervision. Based on the pressure level of the containers under supervision, the hazard level of the medium, and their importance in the production process, the containers are further divided into three categories. I understand that it is only containers under supervision that are classified into categories one, two, and three. Containers that are not under supervision are considered “outside the category”. I believe the owner’s equipment should be a category II vessel, subject to regulatory controls. Attached is the classification of pressure vessels. 14.5 Safety Regulations for Pressure Vessels 14.5.1 Classification of Pressure Vessels Commonly used pressure vessels in laboratories include boilers, gas cylinders, as well as various types of pressurized reactors, containers, and high-pressure pipelines. Pressure vessels come in a great variety due to the significant variations in factors such as temperature, pressure, structure, application, and the degree of corrosion of the medium used. 1. Classification according to the technical characteristics of pressure vessels: Based on the pressure (p) that the vessel can withstand, they are divided into four categories: low pressure, medium pressure, high pressure, and ultra-high pressure. The specific classification is as follows: (1) Low-pressure vessel p

As the two people above mentioned, this heat exchanger should fall under the scope of the Pressure Vessel Regulations.

Whether it’s 150 or the tolerance specifications, this falls within the scope of application

Low-pressure heat exchange equipment with flammable media should be classified as Category 1.

If the PV product is greater than 0.2, it should belong to category three pressure vessels, falling under the scope of pressure vessel regulations

Thank you all for your help. I might not have explained my problem clearly; the medium contains liquids with boiling points higher than the standard boiling point, as well as a gas phase space and water. In a situation like this, should it be considered that the gas phase space is larger than 25L?

All three conditions are met, so it definitely falls under regulatory oversight; it is a type of pressure vessel

The pressure is greater than 0.1 MPa, which classifies it as a pressure vessel

I think it should be classified as a category 3 pressure vessel; formaldehyde is a highly hazardous substance, and the heat exchange area of 500 square meters, along with other parameters such as diameter, should meet the requirements specified in the regulations for pressure vessels. Under such circumstances, it can be classified as category 3.

For a solution containing formaldehyde, since formaldehyde is highly soluble in water and evaporates very easily, according to the heat exchanger described by the poster, the shell side contains a formaldehyde water solution at a temperature of 40 degrees, which is higher than the vaporization temperature of formaldehyde. Moreover, there is a gas phase space in the shell side; according to the pressure vessel regulations, this should be classified as category three.

Formaldehyde is a highly hazardous substance; a PV product of 0.2 or higher classifies it as category three