Is it Possible to Mix Chain Grades on a Sling?

2 comments

by  on August 3, 2010

mixing chain gradesBen from Chicago asked the following question about mixing chain grades:

Is it possible to mix grade 80 chain and grade 100 components on a sling assembly?

Peter answers:

In simple terms, yes –  BUT the assembly can only be rated at the grade 80 WLL.  Here is an example:  A sling is made with grade 100 chain and the hooks used for the sling are grade 80. This sling would need to have a tag with a grade 80 working load limit (WLL) of the weakest component.

For your reference I have provided the following applicable standards:

ASME B30.9, 9-1.5.7

When components of a sling have a lower rated load than the alloy chain with
which it is being used, the sling shall be identified with a rated load consistent
with the lowest load rating of any of the components.

OSHA 1910.184(e)(2)(i)

Hooks, rings, oblong links, pear shaped links, welded or mechanical coupling
links or other attachments shall have a rated capacity at least equal to that of
the alloy steel chain with which they are used or the sling shall not be used
in excess of the rated capacity of the weakest component.

{ 2 comments… read them below or add one }

Gisela Clark Gisela Clark August 13, 2010 at 3:19 pm

Thanks for the great feedback. We appreciate it!

cna training August 6, 2010 at 11:50 am

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