CROSBY ® PLATINUM LINE
• Slings that appear to be damaged should not be used unless inspected and accepted by a designated person. • Personnel, including portions of the human body, should be kept from between the sling and the load, and from between the sling and the crane hook or hoist hook. • Personnel shall stand clear of the suspended load.
Table 2 Use of Crosby Grade 100 Chain At Elevated Tempertures Temperature Temporary Reduction of Rated Load at Elevated Temperature*
Permanent Reduction of Rated Load After Exposure to Temperature**
(F°) (C°) Below 400 Below 204
• Personnel shall not ride the sling. • Shock loading should be avoided.
None 15% 25% 30% 40% 50% 60% 70%
None None
400 500 600 700 800 900
204 260 316 371 427 482 538
• Twisting or kinking the legs (branches) should be avoided. • During lifting, with or without the load, personnel should be alert for possible snagging. • When using a basket hitch, the legs of the sling should contain or support the load from the sides, above the center of gravity, so that the load remains under control. • Sling shall be long enough so that the rated capacity of the sling is adequate when the angle of the legs (branches) is taken into consideration. (See Table 4 for Grade 100 Chain and Table 5 for Grade 80 Chain). General Usage It must be recognized that certain factors in the usage of chain and attachments can be abusive and lessen the load that the chain or attachments can withstand. Some examples are twisting of the chain; disfigurement; deterioration by straining, usage, weathering and corrosion; rapid application of load or jerking; applying excessive loads; sharp corner cutting action and non- symmetrical loading effects. Environmental Effects • Excessive high or low temperatures or exposure to chemically active environments such as acid or corrosive liquids or fumes can reduce the performance of the chain and components. • Extreme temperature will reduce the performance of alloy steel chain slings. • Normal operating temperature is –40°F to 400°F (-40° C to 204°C). • Reference temperature exposure chart to determine reduction of WLL due to operating at, and after exposure to, elevated temperatures (see Table 1 for Grade 80 Chain and Table 2 for Grade 100 chain). • Chemically active environments can have detrimental effects on the performance of chain. The effects can be both visible loss of material and undetectable material degradation causing significant loss of strength. Special Surface Coating/Plating/Galvanizing • Chain should not be subjected to galvanizing, or any plating process. If it is suspected the chain has been exposed to a chemically active environment, remove from service.
5%
15% 20% 25% 30% 35%
1000
Over 1000 OSHA 1910.184 requires all slings exposed to temperatures over 1000 F to be removed from service. * Crosby does not recommend the use of Alloy Chain at temperatures above 800° F. ** When chain is used at room temperature after being heated to temperatures shown in the first column. Over 538
CHAIN INSPECTION INSPECTION AND REMOVAL FROM SERVICE PER EN818/ASME B30.9
Refer to EN818 or ASME B30.9-1.9 for further information Frequent Inspection a. A visual inspection for damage shall be performed by the user or designated person each day the sling is used. b. Conditions such as those listed in EN818 or ASME B30.9- 1.9.4 Removal Criteria, or any other condition that may result in a hazard, shall cause the sling to be removed from service. Slings shall not be returned to service until approved by a qualified person. c. Written records are not required for frequent inspections. Periodic Inspection a. A complete inspection for damage of sling shall be periodically performed by a designated person. Each link and component shall be examined individually taking care to expose and examine all surfaces including the inner link surface. The sling shall be examined for conditions such as those listed in EN818 or ASME B30.9-1 .9.4 Removal Criteria, and a determination made as to whether they constitute a hazard. b. Periodic Inspection Frequency: Periodic inspection intervals shall not exceed one year. The frequency of periodic inspections should be based on: 1. Frequency of sling use 2. Severity of service conditions 3. Nature of lifts being made 4. Experience gained on the service life of slings used in similar circumstances. Guidelines for the interval are: 1. Normal Service – yearly 2. Severe Service – monthly to quarterly 3. Special Service - as recommended by a qualified person c. Written records of the most recent periodic inspection shall be maintained, and shall include the condition of the sling. Removal Criteria An alloy sling chain shall be removed from service if conditions such as the following are present: a. Missing or illegible sling identification. b. Cracks or breaks c. Excessive wear, nicks, or gouges. Minimum thickness on chain link shall not be below the values listed in Table 3. d. Stretched chain links or components.
Table 1 Use of Crosby Grade 80 Chain At Elevated Temperatures Temperature of Chain Temporary Reduction of Rated Load at Elevated Temperature*
Permanent Reduction of Rated Load After Exposure to Temperature**
(F°) (C°) Below 400 Below 204
None 10% 15% 20% 30% 40% 50% 60%
None None None
400 500 600 700 800 900
204 260 316 371 427 482 538
5%
10% 15% 20% 25%
1000
Over 1000 OSHA 1910.184 requires all slings exposed to temperatures over 1000° F to be removed from service. * Crosby does not recommend the use of Alloy Chain at temperatures above 800° F. ** When chain is used at room temperature after being heated to temperatures shown in the first column. Over 538
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