[Q&A Question 095] 2018.04.05
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【Q&A Question 095】April 5, 2018: Briefly explain why, when shutting down the system to purge low-pressure gas pipelines, it is necessary to avoid sending large amounts of steam into the low-pressure gas flare line. The material used for the low-pressure gas flare line in this system is low-pressure threaded steel pipe, which cannot withstand high pressures. The steam purging temperature at 1.0 MPa/cm2 can reach around 180°C. However, when designing the system for low-pressure gas venting, no thermal compensation was taken into account; there are no expansion bends to absorb thermal expansion stresses, which can lead to damage to pipelines and pipe racks in severe cases. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Due to the limitations on the number of posts in the “One Question per Day” section, “One Image per Day” has been moved to the registered devices section; you can access it through the directory I posted. For management purposes, if you need to access content from a few days ago, please go to the summary post below to enter the “My Registration Season” event – (Note: This event is currently ongoing in the Chemical Engineering section). https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=18978 For the daily questions section related to chemical engineering technology training in 2018: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888971 For the daily image section related to registered equipment in 2018: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888970 For the Q&A section related to hydrogen production and hydrogenation technologies in 2018: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888968 For the daily questions section related to LNG technology in 2018: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888973 For the Q&A section from 2017 (updates have started): https://bbs.hcbbs.com/thread-1657793-1-1.html For the daily questions section from 2017 (updates have started): https://bbs.hcbbs.com/thread-1657794-1-1.html For the daily image section from 2017: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1875160 For the list of daily questions related to LNG in 2017: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1804162 For the Q&A section from 2016 (all updates completed): https://bbs.hcbbs.com/thread-1597792-1-1.html
The material of the low-pressure gas flare line in the system is low-pressure threaded steel pipe, which is not pressure-resistant. The steam purging temperature at 1.0 MPa/cm2 can reach around 180°C. However, when designing the system for low-pressure gas venting, no thermal compensation was taken into account; there are no expansion bends to absorb thermal expansion stresses, which can lead to damage to pipelines and pipe racks in severe cases.
The material of the low-pressure gas flare line is low-pressure threaded steel pipe, which cannot withstand pressure. The steam purging temperature at 1.0 MPa/cm2 can reach around 180°C. However, when designing the system for low-pressure gas venting, no thermal compensation was taken into account; there are no expansion bends to absorb thermal expansion stresses, which can lead to damage to pipelines and pipe racks in severe cases.
Answer: The material of the low-pressure gas flare line in the system is low-pressure threaded steel pipe, which cannot withstand pressure. The steam purging temperature at 1.0 MPa/cm2 can reach around 180°C. However, when designing the system for low-pressure gas venting, no thermal compensation was taken into account; there are no expansion bends to absorb thermal expansion stresses, which can lead to damage to pipelines and pipe racks in severe cases.
This is because the material of the low-pressure gas flare line in the system is low-pressure threaded copper pipe, which cannot withstand pressure. The steam purge temperature at 1.0 MPa/cm2 can reach around 180°C. However, when designing the low-pressure gas flare lines in the system, no thermal compensation was taken into account; there are no thermal expansion bends to absorb the stresses resulting from thermal expansion, which can lead to damage to the pipelines and pipe racks in severe cases.
The material of the low-pressure gas flare line in the system is low-pressure threaded steel pipe, which is not pressure-resistant. The steam purge temperature at 1.0 MPa/cm2 can reach around 180°C. However, when designing the system for low-pressure gas venting, no thermal compensation was taken into account; there are no expansion bends to absorb thermal expansion forces, which can lead to damage to pipelines and pipe racks in severe cases.
Is too much water entering the gas holder system along the torch line, causing high steam temperature?
The material of the low-pressure gas flare line in the system is low-pressure threaded steel pipe, which is not pressure-resistant. The steam purging temperature at 1.0 MPa/cm2 can reach around 180°C. However, when designing the flare system for low-pressure gases in such systems, no thermal compensation is taken into account; there are no expansion bends to absorb the thermal expansion stresses, which can lead to damage to pipelines and pipe racks in severe cases.
1. Wasting steam； 2. Prevent a large amount of water from remaining in the flare line.
The material of the low-pressure gas flare line is low-pressure threaded steel pipe, which cannot withstand pressure. The steam purging temperature at 1.0 MPa/cm2 can reach around 180°C. However, when designing the system for low-pressure gas venting, no thermal compensation was taken into account; there are no expansion bends to absorb thermal expansion stresses, which can lead to damage to pipelines and pipe racks in severe cases.