What do metal hoses do? How is it different from a corrugated expansion joint?
As soon as many friends came up, they asked, "What is the difference between metal hose and corrugated expansion joint?" In fact, these two things are quite similar in structure, and they all rely on corrugated pipes to absorb displacement. However, metal hoses are more biased towards "flexible connection", which is mainly used to compensate for pipeline installation deviations, absorb vibrations, or connect equipment with relative motion. And like the ones on our websiteUniversal corrugated expansion joint、High temperature axial expansion jointThey are more specifically used to absorb thermal expansion and contraction. If you use a metal hose to carry a large displacement of thermal compensation, it will be exhausted-this thing is "soft", not "hard".
When choosing a metal hose, first keep an eye on these three parameters: pressure, temperature and medium
Two days ago, I met a customer who said that the metal hose I bought leaked after two months of use. Only after asking did I know that he bought ordinary stainless steel in his pipeline, but he bought ordinary stainless steel. Can it hold up? Therefore, the first article of selection: the medium is corrosive, so it can bePTFE-lined hoseOrPTFE compensator。 Article 2: The pressure should not only look at the nominal value, but also the temperature reduction under actual working conditions. Our website hasMetal hose pressure standardThat question-and-answer, in which the temperature-pressure curve is very clear. Article 3: If the temperature is too high, the material of ordinary metal hose will creep, so you have to choose heat-resistant alloy or heat insulation layer. And guess what? Many people take room temperature selection to set high temperature, and the result is scrapped in a few months.
Don't underestimate the connection method and installation details
When connecting flanges, be sure to confirm whether the flange standards match. Don't make a PN16 flange with a PN25 hose. Isn't that a joke? In addition, when installing, the hose cannot be twisted, nor can it be stressed excessively in the working state. Have seen our "Correct installation method of expansion joint of large tie rod"Questions and Answers? The reason is the same-you have to reserve enough free length, otherwise the hose will be pulled forcefully and the life will be cut in half. Another common question: Do you want to remove the tie rod nut after installation? Metal hoses usually don't have a tie rod, but if you buy an expansion joint with a tie rod, it depends on the design. Looking back at our "How to adjust the tie rod nut of expansion joint", explained in great detail.
How to pick between different industries? Give you some real cases
The big list of products on our website, likeCorrugated expansion joint for power plant industry、Metal Corrugated Expansion Joints in Cement Industry、Desulfurization flue gas baffle door…Every industry has to prescribe the right medicine. For example: Power plant steam pipeline, high temperature, high pressure, you have to useExternal pressure single axial expansion jointOrStraight pipe pressure balanced expansion jointMetal hoses can only do small displacement vibration damping connections here. If it's a cement factory, the pipes are full of dust, thenNon-metallic expansion joint (fabric fiber expansion joint)It is more suitable than a metal hose because it is not afraid of dust accumulation and it is cheap. Another example is a vacuum pipe, such as an air-cooled island vacuum pipe, which has to be usedSpecial hose for vacuumOrdinary metal hoses will deflate when vacuumed. You ask how to judge? It's simple: look at the medium first, then the displacement, and finally the budget. Is that the truth?