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Design Factor

Design Factor(DF):

Design Factor must be determined based on the Total Potential Load(TPL), the degree of risk to people's life, property damage and the conditions of use. This as well is used to establish the WLL using the formula Minimum Breaking Strength divided by the Design Factor (MBS / DF => WLL).

Typical design factors:

For critical applications a Design Factor greater than 12 may be imperative. Operators must decide what the DF is as they are the only ones who can assess application conditions and establish operating procedures. The TPL applied to a chain, binder, cord, rope or tie down strap and should never exceed the WLL. If uncertain, a qualified engineer should be called in to assess the use condition.

The range of Design Factor usually is 3 to 12, and values at the high end of the range, or larger, should be used when:

  1. Smaller ropes or chains are used, because they can be more severely damaged by corrosion, cutting, abrasion and sunlight.

  2. Loads cannot be accurately predicted, we want to on the safe side.

  3. Operators are not trained or not trained well.

  4. Operations and use procedures are not well defined and/or controlled, no experienced engineers have assess the condition.

  5. Inspection is difficult, infrequent or performed by inexperienced inspectors.

  6. Severe abrasive forces and dirt are present.

  7. Extreme dynamic or violent  loading (shock loads) are possible.

  8. High temperatures are present.

  9. Strong chemicals are present.

  10. Chains or ropes are kept in service for long periods.

  11. Chain or rope will be under tension for long periods (creep).

  12. Death, injury or loss of valuable property may result from failure.

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