Question:
To calculate the aggregate Working Load Limit (WLL) of the chains, we need to first determine the WLL of each individual chain and then add them together.
For a 7/15 inch Grade 43 chain, the WLL can be calculated as follows:
WLL = (Minimum Breaking Strength / Safety Factor)
The minimum breaking strength of a Grade 43 chain with a diameter of 7/15 inch is typically 18,800 pounds. The safety factor for Grade 43 chains is 4, which means that the WLL is one-fourth of the minimum breaking strength.
WLL of 7/15 inch Grade 43 chain = 18,800 lbs / 4 = 4,700 lbs
For three 5/16 inch Grade70 chains, the WLL can be calculated as follows:
WLL = (Minimum Breaking Strength / Safety Factor)
The minimum breaking strength of a Grade 70 chain with a diameter of 5/16 inch is typically 18,800 pounds. The safety factor for Grade 70 chains is 4, which means that the WLL is one-fourth of the minimum breaking strength.
WLL of one 5/16 inch Grade 70 chain = 18,800 lbs / 4 = 4,700 lbs
Since we have three 5/16 inch Grade 70 chains, their combined WLL would be:
WLL of three 5/16 inch Grade 70 chains = 4,700 lbs x 3 = 14,100 lbs
Therefore, the total aggregate WLL of one 7/15 inch Grade 43 chain and three 5/16 inch Grade 70 chains would be:
Aggregate WLL = WLL of 7/15 inch Grade 43 chain + WLL of three 5/16 inch Grade 70 chains
Aggregate WLL = 4,700 lbs + 14,100 lbs
Aggregate WLL = 18,800 lbs
So, the aggregate WLL of one 7/15 inch Grade 43 chain and three 5/16 inch Grade 70 chains is 18,800 lbs.
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