Impact test exemption for SS materials
Impact test exemption for SS materials
(OP)
Hi guys,
As UG is general requirements for all material in ASME Section VIII, is it required to address para. UG-20(f) for a vessel which completely made from SS? We have already addressed to UHA-51. But the inspector doesn’t accept that.
Thanks





RE: Impact test exemption for SS materials
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Impact test exemption for SS materials
The inspector may be correct.
What’s your idea?
RE: Impact test exemption for SS materials
RE: Impact test exemption for SS materials
Thanks
RE: Impact test exemption for SS materials
(f) Impact testing per UG-84 is not mandatory for pressure
vessel materials that satisfy all of the following:
(1) The material shall be limited to P‐No. 1, Gr. No. 1
or 2, and the thickness, as defined in UCS-66(a) [see also
Note (1) in Figure UCS-66.2], shall not exceed that given
in (-a) or (-b) below:
(-a) 1/2 in. (13 mm) for materials listed in Curve A
of Figure UCS-66;
(-b) 1 in. (25 mm) for materials listed in Curve B,
C, or D of Figure UCS-66.
(2) The completed vessel shall be hydrostatically
tested per UG-99(b) or UG-99(c) or 27-4. Alternatively,
the completed vessel may be pneumatically tested in accordance
with 35-6.
(3) Design temperature is no warmer than 650°F
(345°C) nor colder than −20°F (−29°C). Occasional operating
temperatures colder than −20°F (−29°C) are acceptable
when due to lower seasonal atmospheric
temperature.
(4) The thermal or mechanical shock loadings are not
a controlling design requirement. (See UG-22.)
(5) Cyclical loading is not a controlling design requirement.
(See UG-22.)
So, all of the items above 1-5 must be met for the exemption. Since there is no mention of UHA steels, you go to UG-84 and follow from there.
RE: Impact test exemption for SS materials
Thanks.
so do you agree with the inspector about addressing to UG?