Impact test energy
Impact test energy
(OP)
Dear All,
Please help me understand some points regarding Impact testing required energy as per ASME BPVC.
First question is what is meant by minimum specified yield strength in Figure UG-84.1? Is it the value specified by the code in II-D or is it the value obtained from mechanical test results?
I mean I have seen test results showing the yield strength well above that specified by the code in II-D.
Second question is that why is there a difference between the values in Figure UG-84.1 and the data in SA-20 Table A2.15? Foe example for SA-516 60 the minimum average value for 3 specimens is mentioned to be 20J as per Figure UG-84.1 however in SA-20 Table A2.15 it is mentioned 18J. Furthermore, the minimum for 1 specimen is 16J as per SA-20 Table A2.15 but the value of minimum for 1 specimen as per Figure UG-84.1 is 2/3 of the required average energy for three specimens which makes it 13.33J.
Third question is that what happens if the impact test is required in temperatures colder than those specified in SA-20 Table A2.15? Is it required to change the minimum required energy?
Warm Regards
Please help me understand some points regarding Impact testing required energy as per ASME BPVC.
First question is what is meant by minimum specified yield strength in Figure UG-84.1? Is it the value specified by the code in II-D or is it the value obtained from mechanical test results?
I mean I have seen test results showing the yield strength well above that specified by the code in II-D.
Second question is that why is there a difference between the values in Figure UG-84.1 and the data in SA-20 Table A2.15? Foe example for SA-516 60 the minimum average value for 3 specimens is mentioned to be 20J as per Figure UG-84.1 however in SA-20 Table A2.15 it is mentioned 18J. Furthermore, the minimum for 1 specimen is 16J as per SA-20 Table A2.15 but the value of minimum for 1 specimen as per Figure UG-84.1 is 2/3 of the required average energy for three specimens which makes it 13.33J.
Third question is that what happens if the impact test is required in temperatures colder than those specified in SA-20 Table A2.15? Is it required to change the minimum required energy?
Warm Regards





RE: Impact test energy
I don't think you are reading Fig UG-84.1 correctly. Min. required is 15ft.lbs for SA-516-60.
Required energy is the same regardless of temp.
RE: Impact test energy
RE: Impact test energy
RE: Impact test energy
SA-20 is a general plate spec, it provides impact test requirements, including energies. These can be used if no other guidance is available. It also allows different values to be specified by the purchaser.
UG-84 is part of a Code of Construction. These values are mandatory for work falling under that Code. They also apply to product forms other than plate. Note also that SA-20 values apply only to certain heat-treats, normalized and Q&T. Why the difference between SA-20 and UG-84? I don't know. Different committees perhaps.
No, neither in SA-20 nor UG-84.
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Impact test energy
Regards
r6155