Are the cold exhaust systems in fertilizer plants considered pressure vessels or pressure pipelines?
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Are the cold exhaust systems in fertilizer plants considered pressure vessels or pressure pipelines? How can they be distinguished?
As stated in Article 3 of the Regulatory Provisions, these regulations do not apply to the following pressure vessels: Paragraph 7: shellless coil exchangers, corrugated plate exchangers, air-cooled exchangers, and cooling tubes. Moreover, the inner diameter of cooling exhaust pipes is generally not more than 150 mm; therefore, the cooling exhaust pipes commonly used in fertilizer plants are usually not subject to pressure vessel regulations. However, the air inlet and outlet separation and collection devices at both ends of some multi-stage cold exhaust systems may meet the regulatory requirements and thus require to be classified separately.