Monitoring and alarm interlocking method for pressure drop rate of trunk line at terminal station of gas transmission pipeline

Abstract

The invention discloses a monitoring and alarm interlocking method for a pressure drop rate of a trunk line at a terminal station of a gas transmission pipeline. The monitoring and alarm interlockingmethod comprises the following steps that a critical value of the pressure drop rate and the number of times that the pressure drop rate continuously exceeds the set value K are set; Step 2, a pressure transmitter collects a pressure signal of the trunk line of the terminal station of the gas transmission pipeline and transmits the pressure signal to a controller; Step 3, the controller calculatesthe pressure drop rate; Step 4, the controller compares the calculated pressure drop rate with a critical value of the pressure drop rate; Step 5, the controller compares the number of times that thepressure drop rate continuously exceeds the set value K with the number of times of continuous sampling comparison, and Step 6 is executed when K is greater than or equal to the number of times of continuous sampling comparison; Step 6: an alarm is sent, human intervention is adopted, an alarm delay action timer is started, and when timing is finished, Step 7 is executed when there has been no human intervention; and Step 7, line cut-off valves at the upstream and the downstream of a pipe burst part are interlocked to be closed, an accident pipeline is isolated from a station yard, and an alarm delay action timer is reset and closed.

Description

technical field [0001] The invention relates to the technical field of pipeline systems, in particular to an interlocking method for monitoring and alarming the pressure drop rate of the main line of the terminal station of a gas transmission pipeline. Background technique [0002] During the operation of the pipeline, due to pipeline corrosion, third-party damage, construction quality and other reasons, the natural gas pipeline ruptures or breaks, resulting in natural gas leakage, which eventually brews into an oil and gas pipeline safety accident, causing great adverse effects on society and enterprises. It has also brought a serious threat to the safety of life and property of the people around the pipeline. If the relevant information such as whether the pipeline is broken or broken is not grasped in time and dealt with in time, the consequences of the accident will continue to increase, causing serious environmental pollution and significant personal and property losses...

AI Technical Summary

Problems solved by technology

[0002] During the operation of the pipeline, due to pipeline corrosion, third-party damage, construction quality and other reasons, the natural gas pipeline ruptures or breaks, resulting in natural gas leakage, which eventually brews into an oil and gas pipeline safety accident, causing great adverse effects on society and enterprises. It also poses a serious threat to the life and property safety of the people around the pipeline.

If the relevant information such as whether the pipeline is broken or broken is not grasped in time and dealt with in a timely manner, the consequences of the accident will continue to increase, causing serious environmental pollution and major personal and property losses.

[0003] For gas pipeline leakage caused by pipeline corrosion, third-party damage, construction quality, etc., since natural gas is a compressible fluid, previous projects could not use the oil pipeline method for leakage monitoring, and it was impossible to realize emergency shutdown of the transmission system in case of abnormal conditions The emergency shutdown function of entering and exiting stations, so that only when there are major accidents such as natural gas leakage, fire or explosion that can be observed by human eyes, relevant problems can be found

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