[Q&A Question 280] 2017.10.08
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【Q&A Question 280】October 08, 2017: Briefly explain what the purpose of ensuring airtightness is after a device is built or repaired (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)
To check for leaks in equipment such as containers, pipelines, flanges, and valves, it is necessary to perform a gas-tightness test using nitrogen or hydrogen in order to identify the leak points； Furthermore, during the startup process of the equipment, when temperature and pressure are increased, leaks can easily occur due to thermal expansion and contraction; therefore, airtightness checks must be carried out at each pressure increase stage.
The purpose of the airtightness test is to detect leaks.
Check for leaks to ensure there are none. Eliminate safety hazards.
To check for leaks at the flange connections of equipment and pipelines, a gas-tightness test is necessary. Additionally, during the process of starting up the plant, the entire system gradually experiences increases in temperature and pressure; especially in cases of high-temperature and high-pressure equipment, thermal expansion and contraction are significant, so gas-tightness tests must be conducted at each stage of pressure increase.
After the installation is completed or undergoes maintenance, a gas-tightness test is necessary to check for any leaks at the flange connections of the equipment and pipelines. Additionally, during the process of starting up the system, the entire system gradually experiences an increase in temperature and pressure; especially in the case of high-temperature and high-pressure equipment, where thermal expansion and contraction are significant, gas-tightness tests must be conducted at each stage of pressure increase.
Answer: After the installation is completed or after maintenance, a gas-tightness test is carried out to check for any leaks at the flange connections of the equipment and pipelines. Additionally, during the process of starting up the system, the entire system gradually experiences an increase in temperature and pressure; especially in the case of high-temperature and high-pressure equipment, thermal expansion and contraction are significant, so gas-tightness tests must be conducted at each stage of pressure increase.
After the installation is completed or undergoes maintenance, a gas-tightness test is necessary to check for any leaks at the flange connections of the equipment and pipelines. Additionally, during the process of starting up the system, the entire system gradually experiences an increase in temperature and pressure; especially in the case of high-temperature and high-pressure equipment, where thermal expansion and contraction are significant, gas-tightness tests must be conducted at each stage of pressure increase.
To check for leaks in equipment such as containers, pipelines, flanges, and valves, it is necessary to perform a gas-tightness test using nitrogen or hydrogen in order to identify the leak points； Furthermore, during the startup process of the equipment, when temperature and pressure are increased, leaks can easily occur due to thermal expansion and contraction; therefore, airtightness checks must be carried out at each pressure increase stage.