Starting from the name of the industry: What is the relationship between compensator, expansion joint and telescoper?
"Is this expansion joint just a telescoper? Can I use a sleeve type instead of a corrugated one?" In fact, in the field of pipe compensation,Compensator and expansion joint are basically the same thing-You see, article 14 of the question and answer on our site also states that expansion joints and compensators actually refer to the same type of equipment in industrial piping systems. But the word "telescoper" is a little ambiguous. In some old drawings, the sleeve compensator is called a telescoper, and some on-site masters collectively refer to all the telescopic tubes as telescopers. So technically speaking,Compensator (expansion joint) is a collective termWhile scaler is more of a colloquial common name, often referring specifically toSleeve type or packing box type。 Don't underestimate this detail. If you choose the wrong model, the pipe may collapse directly when installed.
Classification by material and structure: metal corrugated, rubber, non-woven, sleeve type, what are the characteristics of each?
In the product list on our site, there are dozens of kinds of light expansion joints. Such asUniversal corrugated expansion joint、High temperature axial expansion joint、directly buried expansion joint、External pressure single type axial type…These are metal bellows, which absorb displacement by the elastic deformation of the corrugations. rubber compensator andRubber PTFE compensatorRelying on the flexibility of rubber, it is suitable for scenes with low pressure, large displacement and vibration reduction, such as fan import and export.Non-metallic expansion joint(also called fabric fiber expansion joint) is resistant to high temperatures and corrosion, which is common in flue gas pipelines.Sleeve type pipe expansion joint(that is, the telescoper in some people's mouths) is compensated by the sliding of the inner and outer sleeves. The pressure is high and the axial displacement is large, but the sealing ring is easy to age. AndRotary compensator、Curved tube pressure balance typeThese are specific to operating conditions. At the end of the day, there is no universal compensator, only matching selection.
What to look at when choosing a model? Temperature, pressure, displacement, and medium must not be missing
You use a rubber compensator on the steam pipe? As soon as the high temperature of several hundred degrees goes up, the rubber is directly carbonized. So the high temperature pipeline has to beHigh temperature axial expansion jointOrExternal pressure single type axial type。 If it is desulfurization flue gas, which is highly corrosive, it must bePTFE-lined hoseOrPTFE compensator。 The direction of displacement is also very critical-axial displacement menu, transverse displacement selectionCompound hinge transverse typeBoth axial and transverse,Straight pipe pressure balance typeOrDouble straight pipe bypass pressure balance typeMore appropriate. Don't forget that there arebaffle doorAndIsolation doorSuch ancillary equipment, such asFlue gas baffle door、Round flapper door、Electric plug-in insulation doorThey work with a compensator, but have completely different functions. When selecting the model, fill in the working condition parameters clearly, and don't pat your head.
Don't step on the pits of installation and maintenance
Many people think that the compensator can be installed, but it leaks within two months. There are three common problems: First, the transportation screw was not disassembled before installation-the expansion joint will be fixed by a screw in order to prevent transportation deformation when it leaves the factory, and it must be disassembled or adjusted according to the instructions after installation. Article 13 Q&A specifically talks about this matter. Second, cold-tight pre-stretching was not done, especially high-temperature pipelines, which were not pre-stretched during installation and cracked during operation. Third, the direction of the guide tube is reversed. It is mentioned in the seventh question and answer that the function of the guide tube is to prevent the medium from washing the ripples, and the direction of the arrow must point to the flow direction of the medium. And the packing gland of the sleeve-type telescoper can't be screwed too dead, otherwise the sliding resistance is large and can't be compensated. In terms of maintenance, the rubber compensator should be checked for aging cracks in about three years, and the fatigue life of the metal bellows should be paid attention to. For details, please refer to Article 18 Q&A.
Summary: Different names, the same core functions, but the specific products should be carefully looked at
Back to the original question —Is a compensator the same as a telescoper?Functionally speaking, they are all devices that absorb the thermal displacement of pipelines and reduce vibration and noise, which can be equated. However, when it comes to the procurement link, you report the "telescoper" to the manufacturer, and the other party may give you the sleeve type; You quote "compensator", and the other party may give you bellows. Therefore, it is recommended to clarify the product type directly: for example, "I need an axial corrugated expansion joint with DN200, PN16 and a compensation amount of ±50mm", or "Give me a non-metallic fabric compensator with a temperature of 350℃ and a smoke environment". In this way, you can't go wrong, and you can quickly match the most suitable one from the 29 products on our site. If you are not sure, just throw the working condition parameters over, and we will help you choose-we do this every day, which is more reliable than you patting your head.