Welded steel pipe for low pressure fluid (GB/T3092-1993), also known as general welded pipe, commonly known as the clarined,which used for conveying water, gas, air, oil and steam heating and other general low pressure fluid. steel pipe can be divided into ordinary steel pipe and thicken steel pipe according to the wall thickness. Specifications of steel pipe with nominal diameter (mm) that the nominal diameter is the diameter of the approximation. Customarily used in inches. Welded steel pipe for low pressure fluid directly is used for conveying fluids, but also a lot for low-pressure fluid the original tube of galvanized steel pipes.

Galvanized welded steel pipe for low pressure fluid (GB/T3091-1993), also known as galvanized welded steel pipe, commonly known as white tube, which is used for conveying water, gas, air, oil and steam heating, warm water and other fluids, or other general purpose low-pressure hot-dip galvanized welding (soldering or welding furnace) steel pipe. steel pipe can be divided into ordinary galvanized steel pipe and thicken galvanized steel pipe according to the wall thickness,and according to the pipe form,it be divided into without threaded galvanized steel pipe and threaded galvanized steel pipe. Specifications of steel pipe with nominal diameter (mm) that the nominal diameter is the diameter of the approximation. Customarily used in inches. 

General low-frequency fluid transport with spiral seam welded steel pipe (SY5039-83) is a hot-rolled steel strip for the tube volume, temperature often spiral shape, high frequency welding lap welding method for general low pressure liquid delivery Spiral high-frequency welded steel pipe. General low pressure liquid delivery spiral submerged arc welded pipe (SY5037-83) is a hot-rolled steel strip for the tube volume, temperature often spiral shape, using single-sided or double-sided automatic submerged arc welding method as for water , gas, air and steam is generally low pressure liquid delivery such as submerged arc welding steel pipes.