【Q&A Question 256】2017.09.14
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【Q&A Question 256】On September 14, 2017, during shutdown, pipelines carrying light hydrocarbons, naphtha, etc. are prone to expansion, overpressure, and explosion during high-temperature steam purging; how can this be prevented? (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) The answers to the daily questions change, and today’s answers are shown in subsequent questions. For management purposes, if you need to view content from a few days ago, please access it through the summary post below. 2017 Q&A Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html (Source: Haichuan Chemical Industry Forum)
Precautions: It is strictly prohibited to purge the pipelines carrying the aforementioned media with steam; they must first be washed with water and then purged with nitrogen.
It is strictly prohibited to purge the aforementioned medium pipelines with steam; they must first be washed with water and then purged with nitrogen.
It is strictly prohibited to purge the aforementioned medium pipelines with steam; they must be washed with water first and then purged with nitrogen
It is strictly prohibited to purge the aforementioned medium pipelines with steam; they must first be washed with water and then purged with nitrogen.
It is strictly prohibited to purge pipelines with steam; they must first be washed with water and then purged with nitrogen.
During shutdown purging, the release of substances such as oils, hydrocarbons, gases, and chemicals can cause environmental pollution. Precautionary measures: a. Any emission of hydrocarbon substances must be done in a sealed manner ； b. The purging process must ensure sealed discharge. (9) During shutdown, pipelines carrying light hydrocarbons, naphtha, etc. are prone to expansion, overpressure, and explosion during high-temperature steam purging. Precautions: It is strictly prohibited to purge the pipelines carrying the aforementioned media with steam; they must first be washed with water and then purged with nitrogen. (10) When scanning different media, it is necessary to ensure proper isolation between them to prevent nitrogen, steam, and water from mixing with each other. Preventive measures: Use blind plates for isolation; once the medium has been used, the blind plates must be reinstalled and recorded. (11) When purging with nitrogen, make sure to isolate the process properly to prevent nitrogen from mixing uncontrollably.
During shutdown, pipelines carrying light hydrocarbons, naphtha, etc. are prone to expansion, overpressure, and explosion during high-temperature steam purging – how can this be prevented? It is strictly prohibited to purge the above-mentioned medium pipelines with steam; they must be washed with water first and then purged with nitrogen.
It is strictly prohibited to purge the aforementioned medium pipelines with steam; they must first be washed with water and then purged with nitrogen.
It is strictly prohibited to purge the aforementioned medium pipelines with steam; they must first be washed with water and then purged with nitrogen.