The nominal diameter of
straight seam steel pipe refers to the series of diameters specified in the standard of straight seam steel pipe. For straight seam steel pipes, pipe fittings, valves, etc., the series specified by the standard are used to indicate the nominal straight seam steel pipe diameter. The components of the straight seam steel pipe for conveying fluids adopt the nominal diameter series. The Chinese straight seam steel pipe standard is expressed by an integer whose nominal diameter is in millimeters (mm). The working pressure of straight seam steel pipe refers to the pressure that pipes, fittings, valves, and other pipeline components bear under normal operating conditions. The design pressure of the straight seam steel pipe refers to the pressure that the pipeline is subjected to relatively harsh conditions in the combination of the set and the corresponding design temperature during the normal operation of the pipeline. For the specific content of the straight seam steel pipe pressure pipeline, we will introduce the specific content below:
1. Definition of straight seam steel pipe pressure pipeline
By definition, straight seam steel pipe pressure piping should include all straight seam steel pipe pipes that use pressure to transport gas or liquid. From the production point of view, it follows the name of the straight seam steel pipe pressure vessel, so it is not a pressure pipeline in a simple sense. The possibility of an accident and the hazard of the accident define the scope of the straight seam steel pipe pressure pipeline. my country (Order No. 373 of the State Council) clarified the scope of straight seam steel pipe pressure pipelines and stipulated the definition of straight seam steel pipe pressure pipelines. The pressure used by the pressure pipeline is used for the tubular equipment for conveying gas or liquid, for the liquid medium whose temperature is higher than or equal to the standard boiling point, and the nominal diameter is greater than 25mm. The straight seam steel pipe pressure equipment can not only cause its explosion but also cause explosion and fire due to the leakage of the medium. It is very important to ensure the operation of the straight seam steel pipe pressure pipeline. Therefore, like many others, boilers are listed as special equipment for supervision in China.
2. The role of straight seam steel pipe pressure pipeline
The straight seam steel pipe pressure pipeline is an important part of the production process. Its main function is to use pressure, as well as to distribute, measure, control and cut off the flowing medium. Pressure pipes are like blood vessels in the human body.
3. Application of straight seam steel pipe pressure pipeline
Transportation is one of the five major transportation industries along with railways, highways, water transportation, and shipping. Straight seam steel pipe pressure pipes are more and more widely used in chemical, petroleum, electric power, metallurgy, city gas and heating systems, important tasks of high temperature, corrosive, toxic and radioactive media, and the number of straight seam steel pipe pipeline applications occupies an important position. The application of straight seam steel pipe pressure pipelines is extremely extensive, and it has been in a state of departmental division management since the civil society. Each line of straight seam steel pipe manufacturing, installation, inspection, operation management, etc. has its system, and the technology is different. Compared with straight seam steel pipe boilers and straight seam steel pipe pressure vessels, the management of pipes tends to be more perfect in laws, regulations, and standards.
4. The specific composition of the straight seam steel pipe pressure pipeline
The working temperature of the straight seam steel pipe is the temperature of the straight seam steel pipe under normal operating conditions and the design temperature of the straight seam steel pipe that may be endured under the corresponding design pressure during the normal operation process. The pipeline is composed of straight seam steel pipe pipeline, pipeline support, and so on. Used to convey, distribute, control, or stop the flow of fluids. The piping system is referred to as the piping system, which is a plurality of pipes divided according to the fluid design conditions. Pipeline components are also called pressure pipeline components, which are flanges, gaskets, tightening parts, valves, and special parts of pipelines used to connect or assemble into pipelines.
In addition, after the straight seam steel pipe pressure pipeline is put into use, to detect the horizontal or vertical defects of the LSAW straight seam steel pipe weld, the whole length of the weld is detected by the jet (water column) coupling for wave flaw detection. Jet (water column) wave flaw detection is a coupling between the probe and the steel pipe through the jet so that the longitudinal wave sound beam emitted by the probe is incident into the steel pipe through the water or steel interface, and the steel pipe weld is subjected to pure shear wave flaw detection through waveform conversion. Therefore, to realize the pure shear wave flaw detection in the weld, the incident angle of the probe is between the critical angle I and the critical angle II, which can be obtained from the law of refraction.
