How to ensure that thin walled stainless steel pipes do not leak during construction?

Stainless steel water pipes are strictly tested water pressure test and leakage test, not necessarily every time there is a leak is a problem with the quality of stainless steel water pipes, it may also be caused by a lot of work not installed in place during installation. So how should we properly install the water pipes and perform the leak test?

1. After the stainless steel water pipe is installed, the pressurization test must be carried out. The pressurization test is generally carried out under the condition of double water pressure, and there should be no water leakage in the test.

2. A simple test method without pressurization, but it is not completely feasible.

1. Close the main valve of the water pipe, that is, the main switch of the water pipe in front of the water meter.

2. Turn on the faucet in the room for 20 minutes, make sure that there is no more water and turn off all the faucets.

3. Turn off the water inlet switch of equipment with water storage function, such as toilet tank and washing machine.

4. Open the main valve of the home improvement water pipe.

5. Check whether the water meter is moving 20 minutes after turning on the main switch of the water pipe, including slow walking. If there is movement, it is a leak (if there is a problem with the water meter or if the water pipe is slightly percolating, it may be difficult to determine). Therefore, it is recommended that the water pressure test experiment must be carried out after the construction is completed, generally 8 kg, and the time is 20-30 minutes (it is best to see it in person).

3. The direction of stainless steel water pipes: It is recommended that the water pipes go to the top. The main reason is that in the renovation of waterways, most of them are dark pipes, and the characteristic of water is to flow to a low place.

If the pipeline goes underground, it is difficult to find the leakage in time once it occurs, and the leakage will only be found if the water overflows or the floor is deformed and leaks downstairs, and it is difficult to find the leakage because the water pipe is buried.

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In fact, the construction is in accordance with the regular process, and the connection method used meets the national standard, so the probability of water leakage is very low! There is no guarantee that all construction will be water-free, it's just a matter of chance!

1. When the old water pipe is changed, it is sincerely recommended to replace it with 304 stainless steel thin-walled water pipe DN20*. Although the cost is indeed more expensive than plastic pipes, on the other hand, stainless steel water pipes will not be yellowed, aged, and scaled. When the pipeline is used well, the water quality will be safe and pure, and our daily water will not have impurities and odors.

2. Before installing 304 stainless steel thin-walled water pipe DN20*, it is necessary to estimate the usage of tap water pipes to avoid waste caused by unsmooth installation or excessive purchase.

3. When installing 304 stainless steel thin-walled water pipe DN20*, the pipes and fittings should be inspected to see if there is water leakage or damage. Focus on checking the connection of stainless steel water pipes and pipe fittings to ensure that everything is normal.

4. When installing 304 stainless steel thin-walled water pipe DN20*, the direction of the stainless steel water pipe should be clarified. The key point is that when the embedded wall is installed, the pipeline layout diagram should be drawn if necessary, so as to facilitate timely maintenance in case of failure. On the other hand, when installing 304 stainless steel thin-walled water pipe DN20*, the roof installation is a good choice, that is, the installation cost is a little more, the advantage is that it is easy to find problems and maintenance, and residents can make decisions according to their actual situation.

First of all, you need to know the leak point.

If the leak occurs at the joint location, re-connect and replace it with the appropriate sealant.

If the pipe is ruptured, the pipe can be replaced.

If you have to take measures other than replacement.

Then: 1, arc welding, weld the crack. This requires special welders and fluxes that guarantee that the pipes do not deteriorate. Remember to drain the water before welding.

2. Ordinary electric welding will destroy the performance of the pipeline.

3. Glue. Use waterproof glue and plastic flakes to glue and repair cracks. Drain the water pipes before filling the leak.

Repairs with TIG welding are sufficient.

If there is no pressure, try it with AB glue.

Why use thin-walled stainless steel water pipes for engineering water pipes, thin-walled stainless steel water pipes are safer and practical than other water pipes, and their performance and durability are more in line with the standard requirements.

Thin-walled stainless steel water pipes are safer and more practical than other water pipes, and their performance and durability are more in line with standard requirements.

The long-term thermal expansion and contraction of aluminum-plastic water pipes will cause the dislocation of the pipe wall and cause leakage.

Galvanized water pipes produce rust that not only contaminates sanitary ware, but also mixes in bacteria that grow on uneven inner walls. Corrosion causes high levels of heavy metals in water bodies, which seriously endanger human health.

The high temperature and pressure resistance of PPR water pipe is relatively poor, and the long-term working temperature does not exceed 70; In addition, the inner wall is easy to scale and grow moss, which leads to secondary pollution of water quality, and water pipes are also easy to age.

Copper water pipes are fast in heat conduction, and another disadvantage is that they are expensive.

Thin-walled stainless steel water pipes are the best direct drinking water delivery pipes. It has the characteristics of low leakage rate, which can save valuable water resources. In addition, compared with copper water pipes, stainless steel water pipes have good water permeability and do not corrode under high flow conditions.

Stainless steel water pipe is a safe and non-toxic healthy material that can be implanted into the human body. The inner wall of the stainless steel water pipe is smooth, it will not scale for long-term use, and it is not easy to be polluted by bacteria, which can avoid secondary pollution of water quality and do not have to worry about the impact of water quality. The strength of stainless steel water pipe is high, it is 3 times that of copper pipe, 8-10 times that of plastic pipe, the thermal conductivity of stainless steel water pipe is low, the thermal insulation performance is 25 times that of copper pipe, corrosion resistance, long service life, service life is as long as 70-100 years, stainless steel water pipe material has the role of health, environmental protection, waterproof, impact resistance and high pressure resistance.

In addition, China compulsorily requires high-end engineering buildings, hotels and some medical units to replace the original pipes and lay thin-walled stainless steel water pipes, and the state also strongly advocates the use of thin-walled stainless steel water pipes in residential houses.

There are two main reasons why thin-walled stainless steel water pipes are used for engineering water pipes:

1. Durable: Those who understand stainless steel water pipes know that the life of thin-walled stainless steel water pipes is as long as the building, up to 100 years, and there is no problem with the thin-walled stainless steel water pipes that are generally used and then installed, and there is basically no need to maintain them after installation, and there are very few quality problems.

2. Health and safety: thin-walled stainless steel water pipes take the gold pipeline pipe industry as an example, this kind of stainless steel water pipe is very hygienic and hygienic, high-quality and healthy materials, high temperature resistance, high pressure resistance, energy saving and environmental protection, not easy to accumulate scale, not easy to breed moss, and can also prevent secondary pollution of water quality, so it can be used with confidence.

When the stainless steel pipe passes through the wall or floor, the casing should be installed, and the gap between the casing and the pipe should not be less than 10mm, and the gap should be filled with insulating materials, and the insulation shall not contain iron filings, rust and other substances, and the insulation generally adopts asbestos rope.

In order to reduce the cost and save stainless steel, when the flange is connected, the stainless steel pipe flange or the welding ring movable flange is often used, and the carbon steel loose flange and the stainless steel pipe or between the stainless steel welding ring should be lined with insulating materials, such as eraser, plastic, red cardboard, etc., and the carbon steel loose flange surface can also be coated with insulating paint.

If stainless steel pipe components need to be heated or welded, they need to avoid or quickly cross the sensitive area of 450-850 to prevent intergranular corrosion of stainless steel. After the welding of stainless steel pipes is completed, slag and spatter on the surface of the weld should be removed in time. After the non-destructive testing or inspection is qualified, the surface of the weld and its surroundings should be pickled.

In the process of pipeline construction, only the weld is generally pickled and passivated. If the pipes are heavily polluted or the quality requirements are strict, the above treatment can also be carried out on all pipes. The specific steps are:

Remove oil stains with acetone; Soak or scrub with pickling solution for 1-2h; Rinse the pickling solution with cold water; Soak or scrub with passivation solution for about lh; Rinse the passivation solution with cold water and let it dry at the end.

Post-welding heat treatment, stainless steel pipes have internal stress after welding, when there are chloride ions or other ions in the conveying medium, it will cause stress corrosion, so the weld should be stress-relieved. Stress relief is generally cooled when heated to 850-870, and the pipe fittings containing Qin or Ni are directly cooled in the air. Fittings that do not contain chin or sharp should be cooled to 450 degrees with water and then cooled by air.

After the stress relief treatment, the yield strength and fatigue strength of the pipe weld can be improved, and cracks can be prevented. When the pipe temperature is below 0, it cannot be welded, and when the ambient temperature is lower than 120, it cannot be welded even if there are preheating measures.