Jacket tube issue
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I have a question for everyone: 1. Is the diameter of the jacket flange based on 20592? The specifications do not include flanges for an inner pipe with a DN65 diameter. If the inner pipe of the jacket is DN65, what size should the sleeve be? This specification is not available in the flange catalog – can the flange manufacturer create it on their own? 2. When determining the design pressure for a double-pipe jacket, should it be based on the pressure difference between the two sides, or on the maximum pressure on each side?
Regarding your question: 1. It is recommended that you refer to Section 7 on jacketed pipe design in the \"SHT 3040-2012 Standards for the Design of Pipelines and Jacketed Pipes in the Petrochemical Industry\", which should help resolve your issue. 2. The design pressure should be determined in accordance with the provisions of item f) in 4.1.1.2 of the \"GB-T 20801.3-2006 Standards for Pressure Pipelines – Industrial Pipelines, Part 3: Design and Calculation\". For your reference: f) When a pipe is divided into several separate pressurized sections by partitions (including jacketed pipes, blind flanges, etc.), the design pressure of such partitions shall be no less than the pressure corresponding to the most severe combination of pressure difference and temperature that may occur in the pressurized chambers on both sides during operation