A leakage prevention device at the interface of a natural gas transportation pipeline and its application method

Abstract

The invention discloses a natural gas transportation pipeline interface anti-leakage device and an application method thereof and belongs to the technical field of natural gas transportation. The natural gas transportation pipeline interface anti-leakage device comprises a sealing connection ring. A four-way compensation mechanism can be adopted, and when being subjected to pressure, a limiting seal ring can extend toward the outer side; the phenomenon that the tightening degree is more increased when the pressure is larger is generated, and thus, the sealing performance of a pipeline interface is remarkably improved; and the leakage possibility of natural gas is greatly lowered. Meanwhile, when the natural gas flows steadily in a pipeline, the limiting seal ring is subjected to the smallexternal extrusion force, and at the moment, under the effect of a soft and hard property changing mechanism, the outward extrusion force degree of the four-way compensation mechanism can be changed;the internal extrusion force degree of the limiting seal ring is also decreased, the limiting seal ring cannot be in the high-extruded state all the time, and thus, the time that the limiting seal ring is extruded to be cracked is greatly prolonged; and consequently, the later-stage maintenance frequency and cost of the natural gas pipeline are reduced.

Description

technical field [0001] The invention relates to the technical field of natural gas transportation, and more specifically relates to an anti-leakage device at the interface of a natural gas transportation pipeline and a use method thereof. Background technique [0002] Natural gas is stored in underground porous rock formations, including oil field gas, gas field gas, coal bed methane, mud volcano gas and biologically generated gas, etc., and a small amount comes from coal seams. It is a high-quality fuel and chemical raw material. The main purpose of natural gas is as fuel, which can produce carbon black, chemicals and liquefied petroleum gas. Propane and butane produced from natural gas are important raw materials for modern industry. Natural gas is mainly composed of gaseous low molecular weight hydrocarbons and non-hydrocarbon gases. It is mainly composed of methane (85%) with small amounts of ethane (9%), propane (3%), nitrogen (2%) and butane (1%). Also known as "bio...

AI Technical Summary

Problems solved by technology

[0003] Natural gas exists in a gaseous state during transportation. However, during transportation, the flow of gas will be hindered at the part where natural hydrates are generated. After the gas encounters natural hydrates, the gas will be in a pulsating turbulent flow Such violent disturbances will cause the joints of natural gas pipelines to bear huge pressure. In this case, the PTFE tape used for sealing the existing natural gas pipeline joints will be destroyed due to the stickiness of the tape. open, resulting in gas leakage, which will not only lead to natural gas leakage, waste a lot of resources, but also pose a threat to the safety of people's lives and property, and increase the investment in the maintenance of natural gas pipelines in the later period

Images