Buried pipeline temperature measuring method

[0011] The technical solution of the present invention will be further described below with reference to the drawings and embodiments.

[0012] See figure 1 The embodiment of the present invention provides a method for measuring the temperature of a buried pipeline, which consists of a plug-in thermometer 1, a capillary tube 2, a thermometer outer protective sleeve 3, a threaded boss 4, a protective steel pipe, a sealing block 7, a mounting bracket 11 and The cable trough box 16, the specific measurement process includes: welding the threaded boss 4 to the buried pipeline 6, the threaded end of the threaded boss 4 and the outer protective sleeve 3 of the thermometer are connected by threads; one end of the mounting bracket 11 passes through the concrete foundation 15 Fixed on the ground, the other end is fixed with a plug-in thermometer 1; fix the cable channel box 16 on the mounting bracket 11; connect one end of the capillary tube 2 to the plug-in thermometer 1, and the other end passes through the cable channel box 16 to protect the thermometer The casing 3 is connected; the protective steel pipe is set outside the plug-in thermometer 1, and the capillary tube 2, the threaded boss 4 and the thermometer outer protective sleeve 3 are located in the protective steel pipe; one end of the protective steel pipe is welded to the buried pipeline, and the other end is installed There is a sealing block 7; the plug-in thermometer 1 detects the real-time temperature through a temperature sensor inserted into the buried pipeline to realize local temperature display and remote transmission. Further, the protective steel pipe is composed of a steel pipe 8, a reduced diameter pipe 9 and a steel pipe 10; one end of the steel pipe 8 is connected to the small diameter part of the reduced diameter pipe 9, and a sealing block 7 is installed at the other end; one end of the steel pipe 10 is welded to the buried pipeline 6, the other end is connected with the large diameter part of the reduced diameter pipe 9; the middle part of the steel pipe 10 is connected by a mating flange 5.

[0013] In this embodiment, the diameter of the steel pipe 8 is 2 inches; the diameter of the steel pipe 10 is 4 inches, the material is API 6LGr.B, and the pressure rating is Class150. In practical applications, the size of the steel pipe 8 and the steel pipe 10 should be adapted to the large and small head diameters of the reduced diameter pipe 9 in order to achieve precise butt welding.

[0014] In practical applications, the plug-in thermometer 1 selected in this embodiment has an accuracy of ±0.1% at full scale and a stability of ±0.1% at full scale. The material is 304SS stainless steel, and the explosion-proof level of electrical equipment is ExdIIBT4. Electrical equipment protection The grade is IP65. The connection size of the plug-in thermometer 1 and the capillary tube 2 in this embodiment is 1/2 inch taper thread (NPT). The diameter of the capillary tube 2 selected in this embodiment is 10 mm, and the length is not less than 3500 mm; the installation height of the plug-in thermometer 1 is not less than 1500 mm from the ground. The material of the mating flange 5 selected in this embodiment is A350LF2 carbon steel, and the specification is a 4-inch RF flange; the material of the reduced diameter pipe 9 is A350LF2 carbon steel, and the specification is 4 inches to 2 inches. The threaded boss 4 selected in this embodiment is made of A105 carbon steel, with a pressure rating of Class600, and size specifications: the welding end is 1/2 inch, the thread end is 1/2 inch female tapered thread (NPTF), and the buried The connection form of the pipe 6 is fillet welding; the outer protective sleeve 3 of the thermometer is made of A350LF2 carbon steel, with a pressure rating of Class600, and its sensor end is inserted into the buried pipe 6 at 1/3 of the pipe diameter, and its threaded end size is 1/ 2 inch male tapered thread (NPTM). The specification of the cable trough box 16 selected in this embodiment is 40×40mm, the thickness is 2mm, and the material is 304SS stainless steel. Its main function is to protect the capillary tube 2; the specification of the mounting bracket 11 is a 2-inch galvanized steel pipe; The size is 2 inches.

[0015] In order to firmly fix the plug-in thermometer 1, an angle steel 12 is fixed on the mounting bracket 11, and the plug-in thermometer 1 is fixed on the mounting bracket 11 through the angle steel 12. The size of the angle steel 12 selected in this embodiment is 40×40×4 carbon steel.

[0016] A plurality of "U"-shaped clamps 13 are installed evenly and evenly on the mounting bracket 11, and their main function is to fix the cable trough box 16 and the plug-in thermometer 1. In this embodiment, the number of "U"-shaped clamps is 3, and the size of "U"-shaped clamps is 2 inches, and the material is galvanized steel.

[0017] In order to strengthen the fixation of the capillary tube, the capillary tube 2 adjacent to one end of the plug-in thermometer 1 is fixed on the mounting bracket 11 by a band 14. The number of straps in this embodiment is two, the size of the straps is 2 inches, and the material is stainless steel.

[0018] In addition, the buried part of the temperature measuring device in this embodiment is all buried in paint for anticorrosion treatment.

[0019] This embodiment has been tried out in the Central Asia Natural Gas Pipeline Project, and can realize the function of real-time online temperature measurement without setting meter wells or lifting pipelines, and can effectively prevent the accumulation of combustible gas, the influx of groundwater, and soil movement on the temperature measuring instrument. Cutting force, safer, more saving investment, simple maintenance and operation, beautiful and generous. This embodiment improves the accuracy and stability of the temperature measuring instrument, makes the pipeline construction more standardized, modular, humanized, reduces construction procedures, safe, reliable and accurate operation, convenient maintenance, reduces equipment investment and construction costs, and can be applied The installation of temperature detection instruments for buried pipelines in all oil and gas pipeline trunks, valve chambers, and stations has a huge application space and good economic benefits for long-distance pipeline engineering, oil and gas surface engineering, and oil depot engineering.

[0020] The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present invention in further detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc., made within the spirit and principle of the present invention should be included in the protection scope of the present invention.