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material factor; allowable stress modifier

Safety Factor and Material Factor or Amod, what is the difference?

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material factor; allowable stress modifier

Hello, everyone! When talking about allowable stress, Safety Factor is introduced. While in offshore engineering, there are allowable stress modifier in API and material factor in NPD. So what is the difference between safety factor and allowable stress modifier or material factor? Are they used in special load conditions?

You help will be appreciated. Many thanks! 

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