CHAIN

ALLOY HOOKS GRADE 80

WORKING LOAD LIMIT

MINIMUM ULTIMATE LOAD

The  Working Load Limit  is the maximum load in pounds  which

The  Minimum Ultimate Load  is the minimum load at which new

should ever be applied to chain, when the chain is new   in as

chain will break when tested by applying direct tension to a

new  condition, and when the load is uniformly applied in direct

straight length of chain at a uniform rate of speed in a testing

tension to a straight length of chain.

machine.

PROOF TEST

ATTACHMENTS

The proof test is a term designating the tensile test applied to

Any attachments, such as hooks or links, should have a rated  

new chain for the sole purpose of detecting injurious defects in

Working Load Limit  at least equal to the chain with which it is

the material or manufacture.  It is the load in pounds which the

used.

chain has withstood under a test in which the load has been

applied in direct tension to a straight length of chain.

CAUTION

Only Alloy Grade 80 chain should be used for overhead lifting

ANSI / ASME B30.9c 1994

applications.

Paragraph 9 1.4.2  Mechanically assembled slings shall be com 

prised entirely of proof tested components.   Paragraph 9 1.4.2c

It must be recognized that certain factors in the usage of chain

 If untested components are employed, the sling shall be proof

and attachments can be abusive and lessen the load that the

tested per Paragraph 9 1.4.1 prior to initial use. 

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; and

applying excessive loads. 

CHAIN INSPECTION

INSPECTION AND REMOVAL FROM SERVICE PER ANSI

PERIODIC INSPECTION   INSPECTION RECORDS REQUIRED

B30.9

Normal Service   Yearly

FREQUENT INSPECTION

Severe Service   Monthly

Normal Service   Monthly

This inspection shall include everything in a frequent inspection

Severe Service   Daily to Monthly

plus each link and end attachment shall be examined individually,

Check chain and attachments for wear, nicks, cracks, breaks,

taking care to expose inner link surfaces of the chain and chain

gouges, stretch, bend, weld splatter, discoloration from excessive

attachments.

temperature, and throat openings of hooks.

1.  Worn links should not exceed values given in table 1 or rec 

1.  Chain links and attachments should hinge freely to adjacent

ommended by the manufacturer.

links.

2.   Sharp transverse nicks and gouges should be round out by

2.   Latches on hooks, if present, should hinge freely and seat

grinding and the depth of the grinding should not exceed values

properly without evidence of permanent distortion.

in table 1.

3.   Hooks should be inspected  in accordance with ANSI B30.10.

4.   If present, latches on hooks should seat properly, rotate

freely, and show no permanent distortion.

TABLE 1                                      

USE OF GRADE 80 ALLOY CHAIN UNDER HEAT CONDITION

MAXIMUM ALLOWABLE WEAR AT ANY POINT OF LINK

Reduction in Working 

Permanent Reduction in 

Temperature of Chain    

Normal Chain or Coupling  Maximum Allowable Wear 

Load Limit Because of 

Working Load Limit Because of 

Degress F.

Link Cross Section

Diameter (in.)

Chain Temperature*

Chain Temperature**

500

None

None

0.281

0.037

600

10%

None

700

20%

5%

0.375

0.052

800

30%

15%

0.500

0.069

900

40%

20%

0.625

0.084

1000

50%

30%

0.750

0.105

*Do not use alloy chain at temperatures above 800 degrees F.

0.875

0.116

**When chain is used at room temperature after being heated to

1.000

0.137

temperatures shown in the first column.

1.250

0.169

REFER TO ANSI B30.9 FOR FULL DETAILS

132