This article is Part 5 of a 7-part blog series that will cover what operators should consider when performing a pre-operational hoist safety inspection. Today, we’ll discuss ASME B30.10 hook inspection.
ASME B30.10 covers hook inspection for all hoists, cranes and rigging hooks. Before operating a hoist, it is important to inspect the hook to ensure it is safe and free from defects before lifting a load. When inspecting the hook, there are a few key things to look for:
Deformation can be an indication of overload, side loading or utilizing improper rigging techniques. In some cases it may be apparent that the hook is deformed. Look for any bends, twists, cracks or sharp edges that could cut into your synthetic slings.
To check for less-apparent deformities, measure the hook’s throat opening. (Note: Typically this is not done during pre-operational inspections.) You should remove the hook from service if any distortion is noticeable. Check the throat opening. It should not be more than 5% or 1/4″ from the manufacturer’s original dimension. Check your manufacturer’s recommendations.
Also, some hooks have manufactured marks or bumps between the throat opening and the saddle of the hook. These are reference points for measurement. These can be found on our Hurricane 360° hoist. Each hoist manufacturer’s manual will tell you how to measure the hook.
2. Wear Corrosion
Look for excessive wear or corrosion on the hook. Any wear exceeding 10% of the original section dimension of the hook or its load pin means the hook should be removed from service.
3. Nicks & Gouges
There is an easy rule of thumb you can follow when checking for nicks and gouges – any nick or gouge that you can fit your finger nail into is cause to remove the hook from service.
As you can see in Figure 1, these gouges were put here on purpose to serve as points to measure hook deformation, but, by making these marks, they have created stress areas that can cause the hook to easily fail.
ASME states that hooks shall be equipped with latches and they have to be operable. Latches hold the rigging in the hook when in slack position. They are not meant to be a load bearing piece, which can easily happen when using improper rigging techniques.
To check the latches, ensure that the latch bridges the throat of the hook when in the closed position and that it operates properly.
Hook latches are required unless it can create a hazardous condition. For example, if you have to climb on a load to release latch (fall hazard) instead of using a push stick to back the hook out of the attachment point.
5. Bolts & Pins
Check to make sure that all bolts and pins in the hook are secure. You can see in Figure 2 that the pin is sticking out which is a cause for concern. Check the pin to make sure the chain is properly connected to the hook block. Also check to make sure that the hook swivels and rotates freely when not under load.
Look for proper hook markings, including the manufacturer’s logo.
7. Field modifications
Figure 3 is an example where someone welded on a sister hook. While this may be ideal for their application, these have heat damage and are ruined. If you need a unique hook, you should have an experienced manufacturer do this.
If any of these conditions are present or if you see anything on the hook that causes you concern, take the hook and/or hoist out of service until it can be replaced or repaired.
Learn more about hoist inspection and maintenance