Low pressure fluid transport welded steel pipe and low pressure fluid transport galvanized welded steel pipe (GB/T3092-1993, GB/T3091-1993) are important components in the transportation system of many industries. The quality of these pipes must meet certain requirements in order to ensure the safe and effective operation of the pipeline.
Low pressure fluid transport welded steel pipe is a type of steel pipe which is made by welding two or more steel plates or metal pieces together. The welded steel pipe has good rigidity and durability, which can withstand high pressures and temperatures, and is widely used in transporting low pressure fluids such as water, oil, gas and other liquids. This type of pipe is usually manufactured according to the standards of GB/T3092-1993, GB/T3091-1993, and ASTM-A53.
The pipe material usually used for this type of pipe is carbon steel. Comparatively speaking, carbon steel is inexpensive and with good mechanical properties. In order to improve the corrosion resistance of the pipe, galvanized steel pipe can be also used as the material for low pressure fluid transport. The galvanized layer can reduce the corrosion rate and thus increase the service life of the pipe.
There are mainly two types of processes to produce low pressure fluid transport welded steel pipe and galvanized welded steel pipe. The first type is the seamless steel pipe, which is made by piercing a single steel billet and then sleeve or rolling it into a steel pipe shape. The second type is the electric resistance welding (ERW) pipe, which is produced by a welding machine controlled by a computer and passes an electric current along the surface of the pipe and then melts the weld seam together.
The welding process is critical and requires a lot of experience in order to ensure a sound welding quality. A welded joint must be inspected to ensure the weld line is clean and no cracks or other defects exist. The normal welding mode of low pressure fluid transportation pipe adopts manual arc welding, flash welding or high frequency welding.
The respective national standards for low pressure fluid transport welded steel pipe and galvanized welded steel pipe are GB/T3092-1993, GB/T3091-1993 and ASTM-A53. Before installation, all the pipe segments must first be inspected carefully and conform to the design standards or national codes and standards. As the pipe is connected by welding, it is necessary to ensure that the welding specifications are strictly complied with in order to guarantee the safety of the structure.
In conclusion, low pressure fluid transport welded steel pipe and galvanized welded steel pipe are important components in many industries. The respective national standards must be followed carefully in order to ensure the quality and safety of the pipes. The welding method is critical and must be applied correctly to ensure a sound welding quality.
