Hose + Coupling World December 2021 Sample - Page 19

SPECIAL TOPIC : HOSE ASSEMBLIES
This type of hose assembly is most often used for rubber and composite hoses when pumping oil and petrochemicals , as the pressure that the flange connection withstands directly depends on the operating pressure of the hose itself .
Hose Insurance
Many industrial enterprises work with combustible materials such as nitrogen and other chemical liquids . Therefore , in addition to tightness , insurance is also needed in case of any spontaneous hose disconnection from the aggregate unit . For example , if a human error was made in forgetting to pull the fuel hose out of the gas station before beginning movement , the machine will pull the hose behind it and rip it out of the dispenser . For such cases , special dry disconnect couplings and burst couplings have been developed , which completely eliminate the risk of depressurization of the hose assembly .
On the contrary , when a maximum axial load occurs , the bolts are torn off and the inner section is closed , thereby preventing leakage of the fluid pumped inside . The material of the breakaway coupling is either aluminum or corrosion-resistant stainless steel . The coupling can withstand pressures up to 40 bar , though the connection can be either flanged or threaded ( the type of thread is selected in accordance with NPT or BSP standards ). The range of operating temperatures is from -163 ° C to + 200 ° C , with the operating pressure up to 25 bar , so the connection can be made of any kind of steel , depending on the requirements of the pumped product .
Fast removing couplings connected with a clamp .
For cryogenics , special dry disconnect couplings have been developed that can withstand temperatures down to -20 ° C . In other words , a similar type of hose assembly is passive security against situations where a hose could be subjected to accidental high loads .
Industry Transitions
With the development of modern technologies , rubber hoses have begun to be replaced by hoses made of polymer materials . For example , hoses that are flat-rolled and made of thermoplastic polyurethane . These hoses are used in cases where it is necessary to quickly deploy the pipeline and start pumping in the shortest possible time . Of course , hose assemblies with flanges are not suitable for working on a permanent basis , since it is necessary to installation quickly . This is why special fast-removing couplings were invented .
Hose assemblies with fast removing couplings are a connection in which the hoses are attached to each other using a special sealing cuff , which is fixed between two counterparts with a lock . The diameters of such connections vary from 25mm to 300mm , though depending on the material of manufacture , as a rule , this is often either galvanized or stainless steel . It is also worth noting that such hose assemblies
Flange connector coupling .
can withstand pressure from 10 to 100 bar , as the pressure directly depends on the diameter of the hose -- the larger the diameter , the less pressure the hose can withstand . This type of connection can be manually installed in the field and does not require special skills from the operating personnel . The connection itself is fixed to the hose using a special crimp three-piece coupling , which only requires a wrench . In addition , the hose assemblies can include various tees and elbows .
Tees , Joints , Claws , and Connections
A common problem when laying a flexible pipeline , are both the man-made and natural obstacles ; these can lead to the formation of kinks in the hose . It is necessary for process operation that the hose be installed without any bends .
If a line needs to be divided into several streams , hose tees are used to do so . A special groove is cut out on the tee and the branch , which is suitable for the installation of the lock connection to ensure complete sealing of the hose . On rubber , composite , and other hoses , Camlock , Storz , Geka joints are also used .
Types of Joints Camlocks , an American-type joint , are divided into male and female couplings that are manufactured from aluminum , brass , or stainless steel in order to suit the pumped product and its chemical properties . In the case of brass , intrinsic safety is required . They are joined together by clicking special cam joints . This type of connection can withstand working pressures up to 16 bar , and can include diameters
Dry disconnect coupling .
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