Stainless Steel Pipe Fittings

Advantages and disadvantages of stainless steel bellows

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The stainless steel bellow is installed as a flexible pressure-resistant pipe in a liquid (gas) conveying system to compensate for the connection of pipes or machines and equipment. So what are the advantages of this stainless steel bellows to replace the rubber tube? The following is a brief introduction to the advantages and disadvantages of stainless steel bellows and the installation and application of gas stainless steel bellows.
Natural gas stainless steel hose adopts integrated manufacturing technology. The surface of the pipe body is covered with transparent flame-retardant PVC protective cover. It is specially used for the connection of indoor air source terminal and gas appliance. The joint is made of all metal, which effectively eliminates rubber. The hose is accidentally detached, aged and cracked, leaked by the mouse, leaking, poisoning, explosion and other safety hazards, with corrosion resistance, long service life, good bending performance, convenient connection, beautiful appearance, safer use, relative price more economics. The name of the specification should be called “stainless steel corrugated hose for gas transmission” and “stainless steel bellows for gas appliance connection”.

Gas stainless steel bellows standard

As early as 2010, China issued the relevant Chinese standard “GB/T 26002-2010 “stainless steel corrugated hose and fittings for gas transmission””. This standard applies to the nominal size DN10-DN50, the nominal pressure PN is less than or equal to 0.2 Pa. Hose and fittings.
The industry standard is CJ/T197-2010 “stainless steel corrugated hose for gas appliance connection”. This standard is applicable to gas stoves, gas water heaters and gas meters with a nominal size DN of less than or equal to N32 and a nominal pressure PN of less than or equal to 0.01 Pa. Hose for pipe connection.

Stainless steel corrugated hose advantages and disadvantages

  1. Good construction: stainless steel corrugated hose is a thin-walled hose, the overall weight is reduced, greatly reducing the load of construction work and construction time.
  2. Corrosion resistance: The main body of the bellows is made of 304 or 316L stainless steel. Both ends are made of stainless steel joints or carbon steel joints, which have good corrosion resistance. Sealing is ensured.
  3. High pressure resistance: Considering the actual working pressure of the bellows, the use environment and the use condition, all the parameters have been carefully calculated and tested repeatedly to ensure the pressure safety in the work.
  4. Many types: existing bellows diameter range: DN8-DN4000, other customized according to customer requirements.
  5. Anti-vibration and anti-dislocation: Stainless steel corrugated hose has good flexibility and compensation displacement.
  6. Beautiful appearance: the appearance is clear, and the permanent light is as new.
  7. Shock resistance and high speed
  8. It can transmit torque itself. In the normal mechanical seal operation, the structure must be added to transmit the seal.
  9. Less leakage points.

Stainless steel bellows instead of galvanized pipe
High safety and reliability

The stainless steel bellows changes the threaded connection process into a plug-in connection, and the connecting part adopts a side seal, which can effectively prevent the burr of the bellows from cutting the sealing gasket and causing leakage, and has a refractory material, a water sealing gasket and a fall-proof design. Due to the superior bending performance, the length is optional. A large number of elbows, wires, pipe clamps, etc. are omitted. The leakage point is reduced compared with the galvanized pipe. After installation, the pipe can be rotated 360° without leakage, and the pressure rating is fully applicable. Indoors (pressure 16kg). The stainless steel bellows is made of sus304 stainless steel and is non-aging. It has corrosion resistance and melting point of up to 1500-1600 °C. It is higher than the melting point of copper (950 °C) and the melting point of galvanized pipe (1 200 °C), even in the event of fire. At high temperatures (500 ° C), there is no port dropout and “fire on the fire”. Due to the waveform of the pipe wall, the stainless steel bellows has strong compensability and can resist deformation caused by thermal expansion and contraction and building displacement. (40% of the length of the tube itself does not break)

Stainless steel corrugated hose installation

  1. The bellows of the stainless steel hose is made of chrome-nickel austenitic stainless steel. When using it, pay attention to prevent pitting corrosion of nitrogen ions and corrosive damage of dilute sulfuric acid and dilute sulfuric acid.
  2. After the user conducts the water pressure test on the equipment and piping with stainless steel hoses, it should prevent the impact of rust block and chloride ion sediment, causing corrosion and mechanical damage.
  3. The metal hose should be protected from splashing and mechanical damage during welding, otherwise it will cause leakage.
  4. The sealing pipe system should strictly abide by the safe operating procedures to prevent the hose from being pulled off or blasted due to overpressure caused by improper operation or other factors.
  5. Please carefully digest the stainless steel hose installation method and install it in strict accordance with the correct sketch.

Stainless steel bellows connection methods are divided into: flange connection, welding, threaded connection, quick joint connection, small-diameter metal hose is generally connected by thread and quick joint, and the larger diameter is generally flanged and welded.

Easy to install and beautiful

The stainless steel bellows is easy to install and easy to carry. The tools required for installation are simple and the control is more convenient. It is suitable for the new user to preset the gas pipeline, and is also suitable for the transformation of the old user pipeline. Can meet the various installation needs of users, can be buried in the wall, concealed, surface mounted and other installation methods. The installation efficiency is now three times the quota of 3.5 households/person. The ductility and flexibility of the stainless steel bellows determine its special bending properties, which can be done manually by bending.
The corrosion resistance and oxidation resistance of stainless steel bellows determine its service life of more than 50 years, which is in line with the life of the building. The galvanized pipe has a service life of about 20 years in a good installation environment. Stainless steel bellows make your kitchen more tidy and more beautiful while ensuring safer and more economical. At the same time, you can save expensive pipeline renovation costs.

Reduce accident leakage points

Now the galvanized pipe behind the table, about 10-15 pieces of various fittings used by each household, leaving a hidden trouble of 20 to 30 threaded interfaces. It is connected by stainless steel bellows. There are only 2 interfaces from the back of the watch to the front of the stove. The accident leakage rate is reduced by 90%.
The fixed-length stainless steel bellows is a new product that replaces the existing gas hose. It can be screwed at both ends, or it can be rubber-clamped at the valve end of the stove and screwed at the end of the stove. It can be directly connected with the stove on the table, the set stove and the water heater, thus fundamentally overcoming the unsafe factors such as the aging crack of the hose, oil corrosion, no fire, easy to fall off.

Shortcomings of stainless steel bellows

Of course, the use of stainless steel hose is not foolproof, can not be paralyzed. Wrapping back and forth may cause metal fatigue or air leakage at the threaded interface, so stainless steel corrugated hoses may not be twisted back and forth. If it exceeds 2m, it needs to be fixed. After a mechanical injury has been caused by an external force, we cannot judge whether there is a crack or stress concentration by the naked eye, and it must be replaced.

Why should we vigorously promote the application of gas stainless steel bellows?

According to statistics, more than 80% of indoor gas accidents are caused by pipe materials, gas cookers, gas valves, hoses connected to stoves or private modifications. The hose problem is particularly serious, mainly in the following cases:
The hose is detached. This is mainly due to the fact that the hose is not tightened when it is installed, or it is rusted or loosened after a long period of use, which may cause the hose to fall off and run. Therefore, it is necessary to check whether the connection at both ends of the hose is tight and prevent the hose from being tight. The occurrence of shedding.
The hose is aged. The hose is used for a long time and is not replaced in time. It is prone to aging and cracking, which leads to leaking of the hose. Under normal circumstances, the hose needs to be replaced after two years of use.
The hose passes through the wall. Some users move the gas cooker to the balcony, the construction is not standardized, and the hose passes through the wall. This will not only make the rubber tube in the wall easily break, break and run due to friction, and it is not convenient for daily operation. Inspection brings great security risks to the home. If the gas facilities in your home need to be changed, you must find a professional.
The hose is too long. The hose is too long to be easily mopped. Once it is stepped on by the pedal or pierced by the cutting tool, and the deformation and rupture caused by the pressing, it is easy to cause a gas leakage accident. Gas hoses generally cannot exceed two meters.
Use a non-dedicated hose. When conducting safety inspections in the gas department, the technicians found that some users did not use gas-specific hoses in their homes and replaced them with other materials. The gas department hereby reminds us that it is necessary to use a special gas hose, but not other hoses, and it is forbidden to have a joint in the middle of the hose.
The embedded cooker hose is generally hidden in the cabinet, easy to scratch off, and difficult to find, so it should be checked frequently.
Faced with various problems caused by hoses, the promotion and application of gas stainless steel bellows in recent years can greatly reduce the probability of safety accidents of the above common hoses.
How to prevent security products from entering the households to prevent gas accidents, how to enhance residents’ safety awareness, only the gas company’s human and material resources are limited, and it is necessary to mobilize various social forces more widely and actively participate in gas safety management. Expand the points, lines and surfaces of safety management to eliminate hidden dangers in a timely manner. In the gas industry, the property management offices and neighborhood committees are jointly launched to publicize the common sense of gas safety. Make full use of all kinds of media and do security promotion. As long as everyone is committed to gas safety management, as long as everyone has safety knowledge, and has the determination to maintain safety, there are actions to ensure safety; the gas safety work of the community and residents will be able to create a brand new situation.
In order to build a socialist harmonious society, for the safety and health of the people, and in order to have a safe family environment, it is recommended that new materials and technologies complying with relevant national standards should be adopted in the design and construction of gas engineering. Mature experience with the necessary safety protection. The gas management department shall increase publicity efforts to support and encourage users to select gas appliance products, supplies, materials and alarm devices with strong safety protection performance from regular manufacturers to eliminate hidden dangers of gas leakage, stay away from danger, and live safely. .
The above is about the defects of stainless steel bellows and the introduction of stainless steel corrugated hoses for gas. In addition, the gas stainless steel bellows is expensive but has a long service life. The service life of rubber hoses is 18 months, that is, one and a half years. The service life of stainless steel corrugated hose is more than 10 years, and the comprehensive calculation cost is more economical and safe.
Source: China Stainless Steel Bellows Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)

Article Categories:
Pipe Fittings

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