The nominal diameter of straight seam steel pipe refers to the series of diameter sizes specified in the straight seam steel pipe standard. For straight seam steel pipes, pipe fittings, valves, etc., the nominal straight seam steel pipe diameter of their caliber is expressed in the series specified in the standard. The straight seam steel pipe pipeline components used to transport fluids adopt the nominal diameter series. The nominal diameter of the Chinese straight seam steel pipe standard is expressed as an integer in millimeters (mm). The working pressure of the straight seam steel pipe refers to the pressure that the pipeline components such as pipes, pipe fittings, and valves are subjected to under normal operating conditions. The design pressure of the straight seam steel pipe refers to the pressure that the pipeline is subjected to under relatively harsh conditions in combination with the corresponding design temperature during normal operation. As for the specific content of the straight seam steel pipe pressure pipeline, we will bring a specific content introduction below:
1. Definition of straight seam steel pipe pressure pipeline
By definition, a straight seam steel pipe pressure pipeline should include all straight seam steel pipe pipelines that use pressure to transport gas or liquid. From the production perspective, it follows the name of the straight seam steel pipe pressure vessel, so it is not a simple pressurized pipeline. The possibility of an accident and the degree of harm of the accident define the scope of the straight seam steel pipe pressure pipeline. My country (State Council Order No. 373) clarified the scope of the straight seam steel pipe pressure pipeline and stipulated the definition of the straight seam steel pipe pressure pipeline. The pressure used by the pressure pipeline is a tubular device used to transport gas or liquid, as a liquid medium with a temperature higher than or equal to the standard boiling point, and a pipe with a nominal diameter greater than 25mm. In addition to causing its explosion, the straight seam steel pipe pressure equipment can also cause explosions and fires due to leakage of the medium. It is very important to ensure the operation of the straight seam steel pipe pressure pipeline. Therefore, my country, like many other countries, lists boilers and other special equipment for supervision.
2. The role of straight seam steel pipe pressure pipeline
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 flow medium. Pressure pipelines are like blood vessels connected 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 transport, and shipping. Straight seam steel pipe pressure pipelines are increasingly widely used in chemical, petroleum, electric power, metallurgy, urban gas, and heating systems, and are important tasks for 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. Since the beginning of the civil industry, it has been in a state of departmental management. Each link of the straight seam steel pipe manufacturing, installation, inspection, operation management, etc. in various industries has its system, and the technology is different. The management of straight seam steel pipe pressure pipelines is relatively perfect in laws, regulations, and standards compared with straight seam steel pipe boilers and straight seam steel pipe pressure vessels.
4. Specific composition of straight seam steel pipe pressure pipelines
The working temperature of the straight seam steel pipe is the temperature of the pipeline under normal operating conditions, and the design temperature of the pipeline during normal operation is set to the straight seam steel pipe pipeline that may withstand the corresponding design pressure. The pipeline consists of straight seam steel pipe pipelines, pipeline supports, etc. It is used to transport, distribute, control, or stop the flow of fluids. The pipeline system is referred to as the pipeline system, which is several pipelines divided according to the fluid design conditions. The pipeline components are also called pressure pipeline components, which are flanges, gaskets, fasteners, valves, and special pipeline parts used to connect or assemble into pipelines.
In addition, after the straight seam steel pipe pressure pipeline is put into use, to detect the transverse or longitudinal defects of the LSAW straight seam steel pipe weld, the full length of the weld is subjected to jet (water column) coupling for wave flaw detection. Jet (water column) wave flaw detection is to couple 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 transverse wave flaw detection through waveform conversion. Therefore, to achieve pure transverse wave flaw detection in the weld, the probe incident angle is between the critical angle I and the critical angle II, which can be obtained by the law of refraction.
Post time: Jan-07-2025