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Impact test exemption for SS materials

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

Doesn't sound like the inspector has actually read UG-20(f).

Regards,

Mike

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

RE: Impact test exemption for SS materials

(OP)
UG-20(f) is referred to UG-84, and in UG-84 there are some para about UHA.

The inspector may be correct.

What’s your idea?

RE: Impact test exemption for SS materials

UG-20 (f) applies to a specific exemption for impact testing of PV materials under design metal temperature. Stainless steel in this case would not be exempted by UG-20(f) and defaults to requirements in UG-84.

RE: Impact test exemption for SS materials

(OP)
Is there any specific part of UG-20 shows we cannot use this part as a reference for UHA exception?

Thanks

RE: Impact test exemption for SS materials

First here is an excerpt

(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

(OP)
metengr

Thanks.

so do you agree with the inspector about addressing to UG?

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