4" Diameter for analysis

I get the following message when i modeling a 4 inches STD pipe class 300, why is that?

*** GLOBAL CONSISTENCY MESSAGES ***


* * * W A R N I N G - MODEL * * *
W2164-78: D/t ratio for the following pipe ID(s) is less than 20. The hoop stress
equation may not be applicable for these pipe IDs as per B31.4. Use Model Result
Option Y factor to control hoop stress equation.

4"C3E2B


No error 1 Warning(s)

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