How are the design pressure and design temperature determined for oil pipelines at normal temperature that require steam purging during shutdown?
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I would like to ask fellow professionals: Our company has a pipeline for normal-temperature oils, with an operating pressure of 10 kilograms； When this oil pipeline is shut down, it needs to be purged with steam (3.5 kilograms of steam at 177 degrees Celsius). May I ask how the design pressure and design temperature for this oil pipeline should be determined? Should the conditions for steam purging be considered?
SH/T 3059-2012 \"Code for Selection of Materials in Design of Petrochemical Pipelines\", \"4.2.2.g) The design temperature of pipelines that require purging shall be determined based on specific conditions.\"
Thank you very much. Are there any specific practical examples?
The design of the pipeline should meet the requirements of both operating conditions and purging conditions. In the pipeline table, in addition to indicating the design pressure and design temperature, the operating temperature and operating pressure of the purging medium should also be marked with *. When testing the pipeline system, the test pressure for this pipeline can be calculated based on the design pressure and design temperature of the medium flowing through it, as well as the operating temperature and operating pressure of the purging medium; the higher of these two values shall be used as the test pressure for the pipeline