General Notes

55-2350-252-14

Step 1:

Forward Calculation:

6.69

(43,000 x 0.7)

(9,000X0.50)

Aft Calculation:

2.87

(43,000 x 0.3)

(9,000X0.50)

Lateral Calculation:

0.96

(43,000 x 0.1)

(9,000 x 0.50)

Vertical Calculation:

2.02

(43,000 x 0.3)

(9,000 x 0.71)

Step 2:

Maximum number was calculated in the forward calculation.

6.69 X 2 = 13.38

Step 3:

13.38 is not divisible by 4, so round to 16, which is the next highest number divisible by 4.

Answer: Sixteen chains placed symmetrically about the vehicle are required to secure it for highway

transport on a semitrailer without blocking.

A-4. General Notes

As a general rule, if proper blocking and bracing are used, the total number of chains can be reduced by

four.

a. Chain is generally rated by proof test load or about two times the working load limit.

b. Load binders are generally marked with an ultimate breaking strength rating. Depending on the

manufacturer, breaking strength is about three times the working load limit.

A-2