Water is the source of all things. People cannot live without water, but water is a liquid. It needs to be transported to thousands of households, and some factories must rely on water pipes for drainage, so Water pipes play an important role in people's lives. In the past, most water pipes used by people were made of iron or aluminum. Nowadays, most water pipes are made of stainless steel, because alloys are more stable than pure metals. Regarding the formulation of stainless steel water pipes, the country has corresponding standards. Let’s take a look at them below.

Introduction to national standards for stainless steel water pipes

The surface of water pipe welds should be free of cracks, pores, undercuts, and slag inclusions. The inside and outside should be well processed, and there should be no load that exceeds the wall thickness of the water pipe. Defects such as scratches, dents and straightening marks within tolerances. The fracture should be free of burrs. The allowable deviation of the wall thickness of water pipes is ±10% of the nominal wall thickness. The length of the water pipe is a fixed length, generally 3000~6000mm. According to the requirements of the buyer and the agreement between the supplier and the buyer, other fixed lengths can also be provided. The curvature of the water pipe is any 3000mm and does not exceed 12mm. ?

Stainless steel corrugated pipes are made by corrugating and spirally folding joints using a pipe rolling machine. They have the characteristics of light weight, good stiffness, easy bending, simple connection, small friction coefficient and good adhesion to concrete. It has advantages such as that it is an ideal material for forming post-tensioned prestressed tendon channels. The specifications (inner diameter) are: 50, 55, 65, 70, 75, 80, 90, 100mm, etc. The ends of water pipes should be sawed flat. Stainless steel strips for water pipes are made by automatic argon arc welding or plasma welding on pipe making equipment, and generally no heat treatment is performed after welding.

The appearance of the pipe fittings should be clean and smooth. The weld surface should be free of cracks, pores, undercuts and other defects. Slight mold marks are allowed on the outer surface. Longitudinal scratches should not be greater than 10% of the nominal wall thickness. .

Other standards for stainless steel water pipes

Expansion performance When conducting expansion tests on water pipes with a nominal diameter of no more than DN50mm, a 60° cone shall be used, with an expansion rate of 25%. The rear pipe wall must not be cracked or damaged.

Bending performance When a water pipe with a nominal diameter no larger than DN25mm is subjected to a bending test, the bending radius is equal to 4 times the outer diameter of the water pipe. When the bending angle is 90°, there should be no cracks or wrinkles in the pipe wall.

Hydraulic pressure test, air tightness test

When the water pressure test is performed on the water pipe, the test pressure is 2.45MPa. Under this pressure, after 10 seconds, the water pipe should have no leakage and Permanent deformation. Water pipes should undergo an air tightness test when undergoing hydraulic gas medium or form inspection. Water pipes used for liquid media are more reliable if they are made according to national standards. The country will conduct inspections on manufacturers of such water pipes. After certain inspections, only water pipes that pass the test can be used. The manufacturing process of stainless steel water pipes is relatively simple, and the requirements for them need to be determined according to the scope of use. According to national standards, we can see that the requirements for stainless steel water pipes are usually related to the place of application. We must first look at where they are used, and then inspect the stainless steel water pipes according to the standards.

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