Why does a high tensile value yield a low MAWP?

[Redavocado]

In UG-101 m a high actual average tensile strength will yield a lower MAWP for a given burst value. If, say, I get the MAWP for a fitting using a sample w a low tensile value, but in production I procure the same material that was burst but w a stronger tensile strength according to UG-101 this stronger procured material would yield a lower MAWP and hence not comply to the MAWP derived from the burst test. Stronger = lower MAWP = nonsense. Can anybody explain the rationale fo UG-101's equation and requirement of taking the ratio of min tensile to actual average tensile value to derive MAWP fro a burst pressure?

 

[trottiey]

The actual tensile strength (Sµ avg) of the article used for the burst test should never be lower than the specified minimum, (Sµ) so the situtation you are describing does not happen. If it did happen, you should start worrying about counterfeit material.