The Hose Wrench hammer union wrench
Mountain Valley Supply has engineered a dual-purpose hand tool for applying torque to hammer unions and prying pipe ends. The 3 sizes analyzed in this report are the 3-inch, 4-inch, and 5.5-inch hammer union lift wrenches. The hand tool is required to apply the maximum specified torque to a selected hammer union and capable of supporting the weight of an entire length of matching sized pipe.
Hose Wrench Safe Operation
A structural analysis is performed on the hand tools from two loading scenarios to determine maximum allowable forces and still maintain structural integrity. This includes a Finite Element Analysis (FEA) at the contact surfaces where torque is applied to Hammer Unions and compressive loading to simulate a prying force if it were to be used as a lifting tool. No specific engineering criteria were used to validate the design. Only maximum values were recorded with a Factor of Safety considered. This analysis does not recognize or consider any physical testing. Rather, very conservative material properties and Factors of Safety are used in lieu.
The hand tools are designed for applying a torque to hammer unions from the handle to the center axis of the jaws. They have a secondary purpose of prying and lifting pipes from the upcurved nose at the end of the jaws if needed.
Connecting & Bonding of Materials Primary Structure:
The primary structure is a solid cast
The following material properties are used in the analysis.
Factor of Safety (FOS)
For conservative purposes, a FOS of 2 is used throughout this analysis. If any primary stress is found that results in a FOS less than 2, those areas will be scrutinized and further analyzed.
The following load scenarios were determined to be the maximum allowable:
Lift Wrench 714 Gallery
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