Metallic Hose Assemblies - Thorburn Flex Inc

Metal HoseTechnical DataThorburn flexible metal hose assemblies are manufacturedto the highest quality levels to assure maximumservice life. The following precautions shouldbe adhered to when installing a flexible metal hoseassembly.CORRECTTRAVELINCORRECTTRAVELAvoid Improper HandlingThorburn metal hose can be damaged by draggingor when subjected to external abrasive or corrosiveconditions. Avoid installing hose in areas where itmay be subjected to corrosive sprays, spills, etc.CORRECTINCORRECTTRAVELRIGHTSUPPORTTRAVELDROOPINGWRONGTRAVELTRAVELTRAVELRIGHTWRONGMOTIONMOTIONTRAVELTRAVELRIGHTTRAVELWRONGTRAVELAvoid OverbendingOverbending Thorburn metal hose can result in prematurefailure. This often occurs at the end connections and maybe avoided by installing an elbow or interlock guard.Avoid TorqueTorquing or twisting Thorburn metal hose reduces servicelife substantially. When installing metal hose, it is importantthat all movement originates in the same plane as the centerline. Another precaution against torque is the use of a floatingflange or union on one end of the assembly.Calculations for minimum live length excluding end fittingsThorburn flexible metallic hose assemblies are usuallyflexed in accordance with one or a combination of themodes of motion shown below. To obtain maximumreliability it is essential to calculate the length of anassembly that will not be flexed beyond the minimumbend radius. The following formulae give a guide indetermining the lenght of tube required. They are basedon standard applications using our current prodluct range.Variations should be discussed with our technical dept.L = Minimum Live Length excluding end fittingR = Minimum Bend RadiusM = Movement π= 3.142VERTICAL LOOP –VERTICAL TRAVELL =π (R+M) ( )L = π R+ M 2C = π M +R4VERTICAL LOOP —HORIZONTAL TRAVELOFFSET OR LATERAL MOVEMENT(ONLY SUITABLE FOR SMALLMOVEMENTS OR STATICINSTALLATIONS)L = √20 x R x M15