A Simple Performance Test for Evaluating End Hose Support Straps for Railroad Freight Cars

A study has been performed to simulate the impact experienced on hose support straps during end hose separations on railroad freight cars. Analysis and comparison of test results of different hose straps show that the elasticity of the hose strap determines the reaction force generated by a certain impact. Under the same impact, a stiffer hose strap sustains a larger reaction force. Unlike the current requirement of AAR S-4006, the relation between the elasticity of the hose strap and its reaction force is not linear. Additionally, for a certain impact, the reaction force of the hose strap is only related to its mechanical properties, which reflects the real application. This study concludes that a simple drop test is adequate as an alternative method for performance testing of hose straps.