A prefabricated pipe fitting for gas and its manufacturing method

Abstract

The invention discloses a prefabricated pipe fitting for fuel gas. The prefabricated pipe fitting is mainly used as a pipe of a perpendicular section and comprises an outer pipe, an inner pipe and a foaming layer. The part between the outer pipe and the inner pipe is filled with the foaming layer. The inner pipe comprises a steel pipe lengthened steel plastic converting part and a polyethylene pipe which are communicated through a connecting pipe. The outer pipe is a pipe, equivalently, the prefabricated pipe fitting for fuel gas is only used as a pipe fitting, and the risk of gas leakage is lowered to the maximum degree; in addition, the thermal capacity of soil on the ground and common protection of the thermal resistance of the soil and the thermal resistance of the foaming layer are utilized, and the problem that water vapor is prone to being frozen is solved; furthermore, due to the fact that the polyethylene pipe is used as an outer sleeve, the features that a polyethylene surface is smooth and does not have hydrophilic groups are utilized, the problem that the pipe fitting is pulled and damaged when frozen soil is subjected to frost heaving, and the normal use of the pipe fitting is ensured. The invention further discloses a manufacturing method of the prefabricated pipe fitting for fuel gas.

Description

technical field [0001] The invention relates to the technical field of gas pipes, in particular to a prefabricated pipe fitting for gas and a manufacturing method thereof. Background technique [0002] The gas inlet pipe is defined as, according to the "Code for Urban Gas Design" GB50028-2006, the (servicepipe) outdoor gas distribution branch pipe and the main valve of the indoor gas inlet pipe (when there is no main valve, the first batch of indoor ground is at a height of 1m) Pipeline, gas pipeline supply for residential users, lead-in pipe between the outdoor (outside the building) buried garden pipeline and the indoor (inside the building) pipeline. [0003] In the cold regions of northern China (the three provinces in Northeast my country, Inner Mongolia, etc.), there are two main types of gas introduction pipes. One is that the buried courtyard branch pipe is placed on the foundation of the building, and it passes vertically upwards along the outside of the building fo...

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Problems solved by technology

[0004] The first way of introduction is prone to freezing and blocking of the gas introduction pipe in winter. The water vapor contained in artificial gas and incompletely dehydrated natural gas will condense into Water, when the temperature of the inner wall of the pipe is lower than 0°C, water vapor will frost and freeze on the inner wall of the pipe to form a freeze block, seriously affecting the gas supply

In the cold regions of northern my country (the three northeastern provinces, Inner Mongolia, etc.), the freezing and blocking of gas inlet pipes in winter is common, prone to, and frequent, and cannot be used normally.

[0005] Moreover, soil frost heave will cause damage to the inlet pipe. The moisture content of the soil is generally between 15% and 85%. The vertical section of the gas inlet pipe buried in the frozen soil will be pulled upward by the frozen soil. If there are no effective protective measures, it will cause huge stress damage to the pipeline system, failure and gas leakage. can not be used normally

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