Metallic flexible hoses are a high-quality, flexible connection tube used in modern industrial pipelines. They are primarily composed of metal bellows, metal mesh, and various types of connectors. The inner tube is a thin-walled stainless steel bellows with spiral or annular corrugations, and the outer mesh of the bellows is woven from stainless steel wire or stainless steel strip according to certain parameters. The connectors at both ends of the hose are customized to match the user's pipeline or equipment connectors.
The corrugated hose is formed from thin-walled seamless stainless steel tubes or longitudinally welded thin-walled stainless steel tubes, which are processed into shape through high-precision plastic deformation. The elasticity of the corrugated profile determines the flexibility and fatigue resistance of the hose, easily accommodating various motion deformations and cyclic loads, particularly meeting the compensation requirements for larger system displacements.
Helical metal hoses boast excellent flexibility, fatigue resistance, high and low temperature resistance, corrosion resistance, and many other advantages. They have a significantly longer lifespan compared to other types of hoses (such as rubber and plastic hoses). With the development of modern industry, helical metal hoses that can withstand high and low temperatures, high pressure, and corrosion are increasingly being widely used.
In pipeline systems that consist of pumps or compressors, valves, and instruments for conveying liquids and gases, PTFE hoses often damage instruments due to vibration, shortening the lifespan of components and affecting system operation. Moreover, the noise generated by vibration poses serious health risks to operators. Therefore, installing a pump connection hose at the pump's inlet and outlet can reduce and absorb pipeline system vibrations and noise, while also compensating for certain displacements. This protects the system's normal operation, purifies the working environment, and eliminates common issues such as aging and poor temperature resistance associated with previously used rubber hoses.
Fossil fuel power plants commonly use heavy oil or residue oil as fuel. To ensure more complete combustion and better thermal efficiency, the fuel must be heated and atomized. In the past, copper pipes were typically used to connect the atomizing nozzles due to their high bending stress and low load-bearing capacity, leading to frequent leaks caused by damage during use. In recent years, metal hoses have gradually replaced them, yielding positive results. Metal hoses are generally used in fuel oil nozzle pipes for oil burners and ash water pipes for coal-fired boilers.
These metal hoses are commonly referred to as furnace front hoses. During operation, they primarily endure the effects of pressure pulsations and mechanical vibrations, as well as the influence of the medium temperature. Therefore, designers should adopt corresponding countermeasures.
In the design of numerous coal-fired furnaces, it is a common practice to install a certain length of metal flexible hose in series with the water pipes extending into the furnace chamber and their connecting lines.
