With the development of society, the value of metal hoses is getting higher and higher. Inexperienced customers are often deceived by various metal hose merchants on the market. First, when shopping, merchants do not give discounts at all; then, there are serious quality problems in the products purchased by customers; customers only find problems after using them, which brings various inconveniences to customers. In fact, before purchasing and selecting metal hoses, you need to understand the product in detail, and then consult the market of metal hoses before purchasing.
The role of metal hose
Pipe soft fittings are often used in pipelines, and metal hoses play a very important role. So, what role can metal hoses play? Let us understand:
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Transport media
If the guaranteed medium in the hose has acidic or alkaline chemical properties and is prone to electrochemical reactions, the materials of each part of the hose should be reasonably selected according to the corrosion resistance of the hose material. Heat shrinkage of metal hoses, external vibration and shock, alternating working conditions, short periods of regular monitoring and maintenance, poor management, etc. can also affect hose life.
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Water hammer phenomenon
Water hammer is a pressure transient process caused by sudden changes in the active state of the medium and changes in the momentum of the fluid in the pipe. It is a special oscillation phenomenon caused by unstable activity in the tube. The sharp rise and fall of a pressure wave traveling through a pipe can create a noise similar to hitting a pipe with a hammer, hence the name water hammer. As the flow of water moves, the effect on pipe bending becomes stronger. Therefore, the user should follow the requirements of the operating procedures, such as slow heating, stabilizing the pressure, reducing instantaneous flow and pressure changes, and preventing the occurrence of water hammer.
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Corrosion
The metal hose material is generally stainless steel. The active anions in the medium can easily destroy the passive film of stainless steel. There are small corrosion holes on the base metal, which are the active centers of pitting corrosion. The surface potential of the metal inside the etched hole is negative, and the surface potential of the metal outside the etched hole is positive, so the inside and outside the hole constitute an active passive microgalvanic corrosion cell. The battery has a large cathode and a small anode area ratio structure, the anode current density is large, and the etching hole deepens rapidly. The strength of the metal hose decreases after corrosion, and it is easy to fail when subjected to internal pressure and tensile load. Therefore, metal hoses used in corrosive environments should select data in a targeted manner, increase protection measures, and improve corrosion resistance.
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Temperature.
The metal hose is used at high temperature, and its rated working pressure is reduced according to the working pressure and temperature correction coefficient of the metal hose at high temperature to ensure safe use.
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Fatigue failure
Under dynamic working conditions, the metal hose is often damaged by fatigue cracks under the action of cyclic loads. Such destruction is a normal failure. In order to prolong the service life, we should ensure that the hose design and selection is correct, the equipment is accurate, and the hose is not deformed and other additional stress.
The difference between metal hose and stainless steel hose
Metal hoses include stainless steel metal hoses. The metal hose has an inner surface, and the connecting pipe is made of stainless steel raw material metal pipe, divided into 201, 304 and 316. The two kinds of materials are mainly different in the raw materials of the textile layer of the surface layer of stainless steel wire. The raw material of carbon steel is stainless steel wire, and the raw material of stainless steel plate is stainless steel wire. In theory, the corrosion of carbon steel raw materials is simple, but it is not much different from the pressure of stainless steel plate raw materials. But now the quality of carbon steel raw materials is very low and very few, so the price of carbon steel raw material metal hoses is relatively cheap. It is recommended to buy stainless steel sheet metal hose. Be able to clearly communicate your requirements to the service provider. Both are metal bellows made of stainless steel sheet, with one or two layers of stainless steel wire or ribbon-shaped plastic bags, with connectors or flanged heads on both sides, for transporting various soft parts.
The main purpose of metal hose:
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Transportation of ultra-low temperature or cryogenic substances.
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Transport water at high temperature. Gas, oil and other substances.
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Requires shock absorbers or pipes to remove noise.
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Conveying high temperature steam. Rolling oils and other high temperature substances.
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Transportation of corrosive chemical plant materials. These two are mainly different in the raw materials of the surface stainless steel wire textile layer. The raw material of carbon steel is stainless steel wire, and the raw material of stainless steel plate is stainless steel wire. Carbon steel raw materials are easy to corrode and relatively cheap.
How to choose stainless steel metal hose
Stainless steel metal hose has the advantages of high temperature resistance, low temperature resistance, acid and alkali resistance, etc., mainly because the raw materials for the production of stainless steel hoses are all made of 304 stainless steel, the basic alloy elements of stainless steel and nickel, molybdenum, titanium, niobium, copper, nitrogen, etc. Meet the microstructure and performance requirements of stainless steel for various purposes. The stainless steel metal hose produced by Runda Pipeline is made of 304 stainless steel.
Stainless steel metal hoses will be used more and more in the market, because stainless steel metal hoses have many advantages, so they have been accepted by the market. At the same time as stainless steel metal hoses are sold, many metal hose manufacturers will take inferior products. Disrupting the market, then everyone has the following skills when choosing stainless steel metal hoses:
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From the appearance, the stainless steel corrugated hose in the form of good stainless steel (304 material) is bright in color, not black
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Confirm that the bellows (304 material), the finished product has a good bending feeling, and the stainless steel plate has good softness
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Put the wire mesh on the wire and arrange it neatly without frying the wire. Do not disconnect more than 4 wires
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A very simple method, using a magnet, the real stainless steel (304) will not be sucked in.
If you are looking for suitable stainless steel metal hose, or want to know more information, contact us for more relevant information.
