Chain
GENERAL INFORMATION
WORKING LOAD LIMIT The "Working Load Limit" is the maximum load in pounds which should ever be applied to chain, when the chain is new or "in as new" condition, and when the load is uniformly apphed in direct tension to a straight length of chain. PROOF TEST The "Proof Test" is a term designating the tensile test applied to new chain for the sole purpose of detecting injurious defects in the material or manufacture. It is the load in pounds which the chain has withstood under a test in which the load has been applied in direct tension to a straight length of chain. ANSI l ASME B30.9b-1993 Paragraph 9-1.4.2 "Mechanically assembled slings shall be conprised en tirely of proof tested components." Paragraph 9-1 .4.2c "If untested components are employed, the sling shall be proof tested per Para. 9-1.4.1 prior to initial use." | MINIMUM ULTIMATE LOAD The "Minimum Ultimate Load" is the minimum load at which new chain will break when tested by applying direct tension to a straight length of chain at a uniform rate of speed in a testing machine. ATTACHMENTS Any attachments, such as hooks or links, should have a rated "Working Load Limit" at least equal to the chain with which it is used. CAUTION Only Crosby Alloy chain, Spectrum 8 , should be used for overhead lifting applications. It must be recognized that certain factors in the usage of chain and at tachments can be abusive and lessen the load that the chain or attach ments can withstand. Some examples are twisting of the chain; disfigurement; deterioration by straining, usage, weathering and corro sion; rapid application of load or jerking; and applying excessive loads. |
CHAIN INSPECTION
INSPECTION AND REMOVAL FROM SERVICE PER ANSI B30.9
FREQUENT INSPECTION
Normal Service - Monthly
Severe Service - Daily to Monthly
Check chain and attachments for wear, nicks, cracks, breaks, gouges, stretch, bend, weld splatter, discoloration
from excessive temperature, and throat openings of hooks.
1.. Chain links and attachments should hinge freely to adjacent links.
2. Latches on hooks, if present, should hinge freely and seat properly without evidence of permanent distortion.
PERIODIC INSPECTION - INSPECTION RECORDS REQUIRED
Normal Service - Monthly
Severe Service - Daily to Monthly
This inspection shall include everything in a frequent inspection plus each link and end attachment shall be
examined individually, taking care to
expose inner link surfaces of the chain and chain attachments.
1. Worn link should not exceed values given in Table 1 or recommended by the manufacturer.
2. Sharp transverse nicks and gouges should be rounded out by grinding and the depth of the gouge or rounded
out portion should not exceed values on Table 1.
|
| ||||||||||||||||||||||||||||||||||||||||||||||