IMPACT TESTING

[kandula1]

Hi,
In compress i see a coloum called MDMT,TEST TEMP for a particular material where can i get the values of MDMT and What does test temperature indicates.
I have a vessel with 20" OD and 2700psi int pressure with a thickness of 2.3440.If i run the calcs without impact testing then i get an error saying that Rated MDMT 40F is higher than design MDMT 20F?
Can any one addres this issue

 

[vesselfab]

THE THICKNESS OF 2.344 IN THE MATERIAL LISTED IS EXEMPT FROM IMPACTS DOWN TO +40*F. +20*F IS LOWER TEMP THAN +40*F

IMPACTS ARE REQUIRED

YOU COULD PROBABLY GO TO NORMALIZED MATERIAL TO GET RID OF REQUIRED IMPACTS, BUT CHECK TO MAKE SURE