What is the aggregate WLL of one 7/15 inch Grade 43 chain, and three 5/16 inch Grade 70 chains?

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.