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Wear Allowance of Grade 80 and Grade 100 Chain
The proper selection, application, care and inspection of chain slings used in moving material by hoisting can produce efficient and economical handling operations with minimum hazard to persons and property.
Midco Recommendations
1. Know your sling manufacturer. MIDCO WILL INSURE THAT CHAIN SLINGS SUPPLIED TO YOU ARE IN COMPLIANCE WITH OSHA REGULATIONS COVERING INDUSTRIAL SLINGS.
2. Know your load. Determine the weight, center of
gravity and angle of lift; and select the proper size and type of sling.
3. Never overload the sling. Check the working load limit on the identification tag.
4. Visually examine the chain before each use for
gouged, bent or damaged links or components.
5. Do not point load hooks. Load should bear on bowl of hook.
6. Make sure chain is not twisted, knotted or kinked
before lifting load.
7. Protect chain by padding when lifting sharp-edged
loads.
8. Lift and lower loads smoothly. Do not jerk.
9. Protect chain against corrosion during storage.
10. Store chain properly on A-frame. |
Inspection
1. Schedule periodic link-by-link inspection of chain
slings, based on frequency of sling use, severity of
service conditions, nature of lifts being made, and
experience gained on service life of slings used in
similar circumstances.
2. Clean chain prior to inspection, to make damage or defects more easily seen.
3. Hang chain vertically, if practical, for preliminary
inspection. Measure reach accurately (bearing point of master link to bearing point of hook). Check this
length against reach shown on tag.
4. Inspect link by link, where the following should be
looked for:
A. Bent, gouged, nicked, worn or elongated links.
B. Cracks, scoring or marking tend to weaken links.
Transverse markings are the most dangerous.
C. Severe corrosion
D. Excessive wear. Slings with links having wear
exceeding that shown in Table of Wear (below) should be removed from service.
5. Check master links and hooks for all of the above
faults. Check hooks especially for excessive throat
opening.
It is strongly recommended that chain slings showing faults by the above inspection method be immediately removed from service and returned to manufacturer for repair.
Midco offers chain sling inspection service and proof-testing performed by our own qualified inspectors. |
