The nominal diameter of straight seam steel pipe refers to the series of diameter dimensions specified in the standard of straight seam steel pipe. For straight seam steel pipes, pipe fittings, valves, etc., the nominal straight seam steel pipe diameter is represented by a series specified in the standard. The components of straight-seam steel pipes for conveying fluids adopt nominal diameter series. The nominal diameter of China’s straight seam steel pipe standards is expressed as an integer in millimeters (mm). The working pressure of straight seam steel pipes refers to the pressure that pipes, pipe fittings, valves, and other pipeline components bear under normal operating conditions. The design pressure of straight seam steel pipes 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 straight seam steel pipe pressure pipes, we will introduce the specific content below:
1. Definition of straight seam steel pipe pressure pipeline:
By definition, straight-seam steel pipe pressure pipelines should include all straight-seam steel pipes that use pressure to transport gas or liquid. From a production perspective, it follows the name of a straight seam steel pipe pressure vessel, so it is not a pressure pipeline in a simple sense. The possibility of an accident and the harmfulness of the accident define the scope of the straight seam steel pipe pressure pipeline. Our country (State Council Order No. 373) has clarified the scope of straight-seam steel pipe pressure pipelines and stipulated the definition of straight-seam steel pipe pressure pipes. The pressure used by pressure pipes, tubular equipment used to transport gas or liquid, liquid media 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 the explosion of the straight-seam steel pipe pressure-bearing equipment itself, it can also cause explosions and fires due to leakage of the medium. It is very important to ensure the operation of straight seam steel pipe pressure pipelines. Therefore, our country, like many other countries, lists boilers as special equipment for supervision.
2. The functions of straight seam steel pipe pressure pipes:
Straight seam steel pipe pressure pipeline is an important part of the production process. Its main function is to utilize pressure, as well as 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 pipelines are increasingly widely used in chemical, petroleum, electric power, metallurgy, city gas, and heating systems, and are important tasks in high temperature, corrosive, toxic, and radioactive media, and the number of straight seam steel pipe applications occupies an important position. . Straight seam steel pipe pressure pipes are widely used. The private sector has always been in a state of divided management. Each link of straight seam steel pipe manufacturing, installation, inspection, operation management, etc. has its system, and the technology is different. Straight seam steel pipe pressure Compared with straight-seam steel tube boilers and straight-seam steel tube pressure vessels, the management of pipelines has become more complete in terms of laws, regulations, and standards.
4. The specific composition of straight seam steel pipe pressure pipes:
The working temperature of the straight seam steel pipe refers to the temperature of the straight seam steel pipe under normal operating conditions. The design temperature of the straight seam steel pipe is the set temperature that the straight seam steel pipe may withstand under the corresponding design pressure during normal operation. The pipeline is composed of straight seam steel pipes, pipe supports, etc. Used to transport, distribute, control, or stop fluid flow. The piping system, referred to as the piping system, is a plurality of pipes divided according to fluid design conditions. Pipe components, also called pressure pipe components, are flanges, gaskets, tight fittings, valves, and special pipe parts used to connect or assemble into pipelines.
In addition, after the straight seam steel pipe pressure pipeline was put into use, to detect transverse or longitudinal defects in the LSAW straight seam steel pipe weld, jet (water column) coupling was used to conduct wave flaw detection along the entire length of the weld. Jet (water column) wave flaw detection is coupled by jet between the probe and the steel pipe, so that the longitudinal wave sound beam emitted by the probe is incident into the steel pipe through the water or steel interface, and pure transverse wave flaw detection is performed on the steel pipe weld through waveform conversion. Therefore, to achieve pure shear wave flaw detection in welds, the incident angle of the probe is between the I critical angle and the II critical angle, which can be derived from the law of refraction.
Post time: Jan-26-2024