Fire-fighting pipes have higher standards than ordinary galvanized steel pipes. Fire protection is a point of concern to the country. Of course, fire-fighting pipes are relatively strict. The standard wall thickness of galvanized steel pipes for fire protection is divided into ordinary galvanized steel pipes according to the wall thickness. Steel pipes and thickened galvanized steel pipes. The specification of fire pipes is indicated by the nominal diameter DN, not DH. Let's take a look at the specific wall thickness standards of fire galvanized steel pipes.
1. The nominal pressure PN≤1.0Mpa, the fire pipeline adopts galvanized welded steel pipe for low-pressure fluid transportation, and the thickness of the pipe wall is as follows:
DN65, wall thickness S=4.0mm;
DN80, wall thickness S=4.0mm;
DN100, wall thickness S=4.00mm;
DN125, wall thickness S=4.00mm;
DN150, wall thickness=4.5mm;
The maximum specification of galvanized steel pipe specified in GB/T3091-2008 is DN150.
2. When DN>150, seamless steel pipes for fluid transportation should be used (GB/T8163-2008):
DN200, wall thickness D=7.0mm; (seamless steel pipe is usually expressed by the outer diameter multiplied by the wall thickness, then the pipe is expressed as D219×7, and D219×7 belongs to the nominal diameter DN200 specification series).
DN300, wall thickness S=8.0mm; (then the tube is represented as D325×8, D325×8 belongs to the nominal diameter DN300 series).
What is the standard wall thickness of galvanized steel pipes for fire protection? The content is here. Galvanized steel pipe manufacturers suggest that you use the following model sizes: DN150-4.0, DN125-4.0, DN100-3.5, DN80-3.5, DN65-3.25, DN50-3.0 , DN40-3.0, DN32-2.75 or 2.5, DN25-2.75 or 2.5. You can order according to your needs, the above content is for reference only.