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UCS 66 (b) Impact test exemption

UCS 66 (b) Impact test exemption

UCS 66 (b) Impact test exemption

Hi all,

As per UCS 66 (b)(3) "When the minimum design metal temperature is colder than −55°F (−48°C) and no colder than −155(−105°C), and the coincident ratio defined in Figure UCS-66.1 is less than or equal to 0.35, impact testing is
not required".

My question in this matter is that, if for example, you want to go below -48°C and the ratio is below 0.35, then what will be the rated MDMT of your vessel in this case. For example the required MDMT is -60°C and the MDMT you are getting is -48°C. Now, if the ratio comes out to be 0.3, for example, what will be the MDMT now. Will it be -105°C??

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