Which is the most reliable connection method for thin walled stainless steel pipes for domestic hot

Thin-walled stainless steel pipes are mainly used in hot water from the material of the stainless steel itself, 304 stainless steel can withstand no more than 200mg liters of chloride ion content when it is lower than 40 (hereinafter referred to as cold water), but when the temperature exceeds 40 (hereinafter referred to as: hot water), the chloride ion resistance drops to no more than 50mg liters (Note:

The chloride ion content of urban tap water is 50mg liters) and with the rise of temperature, the chloride resistance is on a downward trend, and 316 (L) stainless steel is resistant to chloride ion content of 1000mg liters in cold water, and the chloride ion content in hot water can also be up to 250mg liters, so the most important thing is to consider the selection of materials, I think that 316 (L) thin-walled stainless steel pipes should be used in hot water. Don't be misled by the manufacturers for their own interests, the money is their own, the direction of the material is set, the rest is to save money is the king, which connection method is the most cost-effective to choose! [The material data mentioned in this article refer to 10s407-2 and 10s407-2 shall prevail].

1. Convex connection is currently the most advanced and competitive connection mode.

2. Double snap-on connection will gradually become the mainstream connection mode.

3. Single-card compression connection Many manufacturers are doing mainstream products but they are already out.

4. Welding has the largest tensile force, but the requirements for construction and welding site protection are too high, and it is slowly introduced to the market.

5. Ring pressure differentiated connection products but from serious safety hazards.

The content has been listed, so compare it yourself.

The lowest labor cost is, of course, the product with simpler construction, provided that the safety of the connection is guaranteed under the premise of comparison!

A good water pipe is as important to a building as blood vessels are to the human body.

Stainless steel water pipes have long been widely used in developed countries.

United States. In 1996, the U.S. Congress made it clear that only stainless steel could be used as a metal material for drinking water.

Japan. In 1982, Japan began to use stainless steel pipes as the standard for urban water supply pipelines, and now in Tokyo, Japan, the penetration rate of stainless steel water supply pipes has almost reached 100, which has greatly improved the quality of urban water supply.

United Kingdom. In Scotland, England, copper pipes were corroded due to the use of soft water, and the authorities spent a huge amount of money to replace all the hot and cold water pipes with stainless steel pipes.

Germany. More than 80% of the residents have installed stainless steel water pipes.

Why do these developed countries choose stainless steel pipes as water supply pipes?

Indeed, it can be mainly shown from two perspectives: environmental protection and economy.

Stainless steel material is a recognized healthy material that can be implanted into the human body, with the characteristics of safety and reliability, health and environmental protection, good corrosion resistance, etc., can accept large vibration and stamping, no pollution, and can avoid bacterial reproduction.

Due to the good corrosion resistance of stainless steel, the service life of the water system can be up to 100 years, so the total cost of the whole life is low.

Therefore, on January 2, 2003, the Ministry of Establishment of the People's Republic of China officially issued a proposal to give priority to the use of stainless steel water pipes. As a representative enterprise in the domestic pipeline industry, Yiben Group is committed to further increasing people's drinking water health level.

Yiben stainless steel water pipe adopts advanced stainless steel surface protection film forming technology for stainless steel surface treatment, reshapes the original stainless steel surface oxide film layer, can greatly hinder the corrosion and damage of stainless steel by external environmental elements, and effectively further add the corrosion resistance of stainless steel. It has the characteristics of health and environmental protection, beautiful appearance, fast and efficient installation, zero maintenance, etc., and the service life can reach up to 100 years.

The use of Yiben stainless steel water pipe can avoid corrosion and dirty excrement, even if the water stays in the pipe for a long time, it will not form secondary pollution, ensuring the water safety of residents; It has become the first choice for many projects and home improvements.

With the gradual standardization of the stainless steel pipe industry and the development of Yiben stainless steel pipe technology, it will invent a healthy, environmentally friendly and hygienic favorable conditions for the people's daily water.

Good pipe, good steel, healthy delivery!

Press it with a ring. Hope it helps.

Dear, hello, I am glad to answer for youA: stainless steel clamping pipe fittings can be used for hot water, stainless steel is an inert metal, the expansion ratio is small when heated, and it is not easy to be corroded. In the past, the common connection method of water pipes is threaded connection galvanized iron pipe, and the pipe with threaded connection needs to have enough thickness to carry out threaded tooth supply, and the wall thickness of galvanized iron pipe is high, and there is no problem in completing the tooth supply treatment.

However, now the minimum wall thickness of thin-walled stainless steel pipes has been achieved, which can not meet the minimum wall thickness requirements of the donor tooth at all. The hot-melt connection PPR water pipe adopts the hot-melt connection, which heats the nozzle and the fitting mouth with a hot-melt machine, and then connects the nozzle with the pipe fitting mouth immediately, and waits for the temperature to drop before completing the hot-melt connection. However, as a metal pipe, the melting temperature of stainless steel water pipe needs to reach a high temperature of more than 1500, not to mention whether the heating setting can be designed to a high temperature of more than 1500, even if it can, the on-site construction is extremely unsafe.

Glue connection PVC-U water pipe and pipe fittings are connected by glue bonding, coated with special glue at the nozzle, and then quickly connect the pipe fittings, and complete the bonding connection between PVC-U water pipe and pipe fittings after the glue is dry. Can stainless steel water pipes be glued and connected? There are also a lot of metal-specific glues available online.

Stainless steel water pipes are connected with glue, which is not feasible and why? Because stainless steel water pipes are not only used for daily tap water, but also for hot water, and when the glue connection is used for hot water, after the glue is heated, it will lose its adhesive effect for a period of time, even if it is a PVC-U water pipe, it will not be used for hot water pipes in decoration projects. Press-fit connectionThe press-fit connection is a connection method suitable for stainless steel water pipes.

In the past, snap-on fittings were also used for the connection of copper pipes, but because copper pipes are more expensive than stainless steel pipes, they have not been popularized. The press-fit fittings have a built-in rubber sealing ring, which is more reliable than the previous threaded pipe fittings and hot melt pipe fittings. The installation connection is also very simple with a special clamping tool.

Both cold and hot water can be used, and there is no problem of glue bonding and falling off. Therefore, it is recommended to use double snap-on fittings for stainless steel water pipe connections.

To put it simply, the safety of thin-walled stainless steel pipes mainly depends on the tightness of the connection; And a good seal depends on the permanent compression ratio of the sealing ring and the protection of the sealing ring, the elasticity of the O type is the strongest in all shapes, the good elasticity ensures the permanent compression, the double clamping has the bearing port for the protection of the sealing ring, and at the same time, under the condition of external force, the external force will not hurt or destroy the sealing ring, mainly concentrated in the bearing port, so the sealing performance of the double clamping pressure is safer and more reliable; If there's a difference, that's the biggest difference.

Personally, it is recommended to use a ring pressure connection.

In terms of the scope of application, the clamp connection is only suitable for the diameter of the diameter is not greater than DN100, and the ring pressure connection is DN15-DN150.

From a safety point of view, the clamp connection is easy to leak water, and the safety performance is not high, while the ring pressure connection has strong sealing and is not easy to leak.

It is recommended that you use ring pressure, which has good sealing performance and is not easy to leak.

The stainless steel water pipe with double press connection method is the most common at present, and it is also the most used stainless steel water pipe in home decoration. The main advantages of the double compression connection method are:

1. Easy to operate: there are special supporting hydraulic tools when the double clamping stainless steel water pipe is connected and installed, and those who have used it will know that it is very convenient to operate, and they will get started after reading it.

2. Good air tightness: the rubber ring of the double-clamping stainless steel water pipe is sealed in the stainless steel material, the durability of the rubber ring is significantly improved, and the double clamping sealing ring is squeezed evenly on the left and right, and the sealing effect is greatly improved.

3. Reliable and durable: the tensile force of the double-clamping stainless steel water pipe is more than 2 times that of the single-clamping joint, and the double-clamping joint will not affect the sealing ring when the pipe is bent and deformed by external force.

4. Large application range: double clamping stainless steel water pipes have many uses, and are widely used in many system fields such as direct drinking water, tap water, hot and cold water, heating, gas, fire sprinkler, etc.

The use specification of double clamping stainless steel water pipe is DN15-DN100, that is, it is suitable for household and engineering use, and it is clamped at one time during installation to prevent the pipeline from running, leaking, dripping and other phenomena due to loose joints, so that water resources can be effectively used and waste is avoided, and at the same time, it also plays a protective role in the quality of water.

The general process of the operation of ring pressure connection stainless steel water pipe is: first, insert the stainless steel thin-walled water pipe with the O-ring sealing ring into the ring pressure pipe fittings, and then use special appliances to apply enough radial pressure to the common parts of the pipe and pipe fittings, so that the pipe fittings and pipes are found to be deformed, and the sealing parts of the pipe fittings will form a closed sealing cavity, and then further compress the volume of the sealing cavity, so that the whole sealing ring can completely fill the sealing cavity, so as to achieve sealing.

Therefore, compared with the stainless steel water pipe connected by ring pressure, the stainless steel water pipe with double clamp connection has more guarantee than it in terms of firmness and reliability, which is why most stainless steel water pipes now choose to use double clamp connection.

Stainless steel water pipe ring pressure and press connection, these two installation methods comparison:

1.From the point of view of the form of sealing material: the clamping is an O-shaped sealing ring, and the ring pressure belongs to the flat sealing ring. The sealing state of the press-type sealing ring is O-type, the sealing ring is a spherical seal, and the annular pressure sealing ring is a hemispherical and semi-flat sealing ring, and the middle part is prone to hollowing.

2.From the point of view of the deformation state of the connection: the clamping is hexagonal deformation, and the ring pressure is circular deformation.

The clamping connection is to press the stainless steel pipe fittings and pipe fittings into a hexagonal structure, and the ring pressure connection is to press the stainless steel pipe fittings and pipe fittings into a circular structure, the principle is basically the same, both are caused by deformation after the diameter reduction seal.

3.From the comparison of the pull-out force after jointing, the clamping pressure is greater than the pull-out force of the ring pressure. The deformation of the two weights can also be seen. A circular face shape into a hexagonal shape is definitely more tensile than a round face shape or a round face shape.

4.In terms of connection mode: the clamping and ring pressure of thin-walled stainless steel pipe fittings belong to mechanical connection, that is, the connection between the stainless steel pipe and the pipe fittings is hydraulically deformed and sealed by a special clamping machinery.

The stainless steel water pipe adopts double clamping connection, using the physical connection method of "cold extrusion", no harmful substances precipitation, and the shape of the clamping makes the pipe have good tensile resistance, safe, reliable and simple!

The safety of thin-walled stainless steel pipes mainly depends on the tightness of the connection;

And a good seal depends on the permanent compression ratio of the seal and the protection of the seal, in all shapes.

The O-type has the strongest elasticity, good elasticity ensures permanent compression, and the double clamping has a bearing port for the protection of the sealing ring, and at the same time, under the condition of external force, the external force will not hurt or destroy the sealing ring, mainly concentrated in the receiving port, so the sealing performance of the double clamping pressure is safer and more reliable; If there's a difference, that's the biggest difference.

Snap-on connection.

Using the effective rigidity of the metal material and the elastic compression ratio principle of the sealing material, and at the same time making full use of the length of the bearing port, the radial shrinkage external force (hydraulic tong) is used to clamp the pipe fittings on the pipe, and the connection effect is achieved through the water stop of the O-ring sealing ring. Generally, the maximum diameter of the press-fit connection can be DN100.

Welded connections:

The hot melt process is used to weld the two connectors to achieve the effect of connection.

Socket welded connection:

A kind of extension of welded connection, the pipe is inserted into the pipe fitting, and then the pipe fitting is extended around to make an argon arc welding connection, so that the pipe and pipe fittings are self-fused into one.

Trench connection:

The nut of the pipe fitting is tightened, and the pipe with a convex ring is pressed axially with the pipe fitting, and the connection effect is achieved by stopping water through the conical sealing ring.

Flanged connection:

The two connectors with flanges are connected by tightening bolts, and the connection effect is achieved through the sealing of the flat sealing sheet.

Threaded connections:

The two connectors of the inner and outer interfaces with tapered pipe threads are tightened by direct tightening of pipe fittings or pipes, and the connection effect is achieved through the pressure sealing of the connector threads (the same as the traditional threaded galvanized steel pipe sealing).

After developed countries such as Europe set stainless steel water pipes as standard pipes for water supply pipelines, Swedish engineers invented stainless steel pipe compression connection technology. After more than 40 years of evolution, this technology has gradually matured, and there are standardized double clamping pipe fittings in Europe, Asia, America and other regions.

Stainless steel double press-on.

Principle of connection. There is a special rubber material sealing ring in the U-shaped groove at the port of the pipe fitting, and only the port of the stainless steel pipe needs to be aligned to the position of the positioning step during installation, and then the U-shaped groove of the socket and one side of the clamping part are squeezed with a special pressing tool.