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Impact Test Exemption for Pressure Vessel as per ASME UCS 66

Impact Test Exemption for Pressure Vessel as per ASME UCS 66

(OP)
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??

RE: Impact Test Exemption for Pressure Vessel as per ASME UCS 66

Mech2325, first understand that typically the MDMT of a vessel is not generally determined in reference to a single component, all components must be considered.

But, for your example, yes the vessel MDMT may be set as low as -105 C, but it need not be set below the specified MDMT, -60 C in your example.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

RE: Impact Test Exemption for Pressure Vessel as per ASME UCS 66

(OP)
Sntman

Thank you for your valuable feedback. Yes, i know, the vessel MDMT comes by taking the warmer of all the components' individual MDMT's. But, in case of carbon steel, the least you can get is -48oC. Now, if the design MDMT is -60o and the ratio from UCS 66 comes out to be 0.34. What will be your final adjusted MDMT??

RE: Impact Test Exemption for Pressure Vessel as per ASME UCS 66

I would set it no lower than the required MDMT, -60 C.

The problem with sloppy work is that the supply FAR EXCEEDS the demand

RE: Impact Test Exemption for Pressure Vessel as per ASME UCS 66

(OP)
sntMan

Thanks again for your valuable feedback

RE: Impact Test Exemption for Pressure Vessel as per ASME UCS 66

hi

even if impact testing may be not required for base metal before assembly as per UCS-66, impact testing may be required for the welding procedure as per UCS-67

regards

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