The Importance of A Proof Load Test
Lifting loads using hoists and cranes is common in a wide variety of industries. This equipment is used for construction, in the oil and gas industry, in industrial applications and specialty applications such as shipbuilding, aerospace fabrication and mining.
At Kennedy Wire Rope & Sling Company, we provide top equipment and rigging for all types of applications. We carefully select our suppliers to include those companies with a top reputation in manufacturing durable, safe and rated rigging and components that can be used in general and specialty types of lifting operations.
For manufacturers, an important test to complete before using any lifting or rigging equipment is a proof load test. This test is done to specific methods and standards to test the tensile strength of the component over a set period of time.
Tensile Strength Testing
As the proof load test is a test of tensile strength and load capacity, it is helpful to review just what that means. This process will test the material’s ability to retain its shape and not elongate under force. Known in the industry as Proof Load Test Machines, Test Beds are used to tension test or proof test, wire rope, fiber rope, chain, lifting slings and other types of lifting gear. These machines are extremely heavy-duty and have proven themselves in years of rugged, real world industrial and military rigging environments.
The process of completing the proof load test has a sample of the equipment or the material (chain, wire rope or synthetic material) attached to the hydraulic cylinders. The loading force of the Proof Load Test machines is provided by hydraulic cylinders, one cylinder is for the main (high) loading force and a smaller one (optional) for the low loading force. Each pulling cylinder has its own heavy-duty electronic load cell for highly accurate (+/- 1%) independent display of the loading force.
While all of our materials are rated to specific industry standards through this method, there is a built-in safety margin in the testing. Depending on the component it will typically have to demonstrate additional weight bearing capacity before failure to meet the lower standards or rating. This builds in safety for operators in the event of use with loads that are over the weight rating.
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