The secret of purchasing steel pipe inspection

1. From the appearance of spiral steel pipe. In appearance, it is necessary to carefully discuss the welding, see whether there are shortcomings in appearance, whether there is a lack of standards, these can probably be seen from the naked eye, although to be careful and both sides of the theory, take out the basis of the example of the sample, gauge and magnifying glass to inspect. Due to the shortcomings of the welding on the outside, it means that there are probably defects in the spiral steel pipe. Even the appearance of time is not done, and the time inside is difficult to ensure.
2. The inspection measure is to deploy the inspection with the installation equipment, which is to use the ultrasonic inspection, X-ray inspection, penetration inspection, and magnetic inspection measures in the environment without harming the pipe to inspect whether there are invisible defects in the spiral steel pipe. In addition to the defects of the inspection, but also hold the pressure vessel strength inspection. Usually there are two kinds of hydraulic test and pressure test. Such inspection is to see the precision of the weld of the spiral steel pipe, and it is usually more accurate to use air pressure inspection. But the air pressure inspection has harm, if not vigilant in accordance with the rules to operate will appear quiet chaos.
Spiral steel pipe is also inspected whether there is a string of cracks, there is no porosity, there is no mixing residue, is there no welding through the place, is there a loose arrangement, usually with kerosene test, with water test is probably water flush test and other measures. In addition to the still water test, the operation can roughly ensure that there are no leakage examples of the pipe. All spiral steel pipes can probably be sold and used as long as they have passed the multiple inspections. Then in the procurement time, the manufacturers must have these prosecutorial statements, probably at the inspection site in person.