Hi, Mr. Manpreet, thanks for your reply. Refering to Non-mandatory appendix JJ and UHA-51 (e) & (f) of ASME Sec. VIII Div. 1 2010 Ed., I think Impact testing is mandatory for welding procedure qualification and for austenitic S.S. welding consumables with MDMTs colder than (-104º C). In our job, MDMT is (-105º C.) Exemption from Impact tesing is only applicable complying UHA-51 (g). I have no idea about desing stress and coincident ratio. It will be appreciable if any body can focus on this. Thanks & regards, C. R. GANDHI
--- On Fri, 10/14/11, manpreet <manpreetsin88@rediffmail.com> wrote:
From: manpreet <manpreetsin88@rediffmail.com>
Subject: Re: [MW:12672] IMPACT TESTING OF S.S. 304 L MATERIAL MDMT -105 C.
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Date: Friday, October 14, 2011, 3:10 PM
Hi,
Impact testing is not required, please see below interpretation:-
Regards Manpreet Singh
Interpretation: VIII-1-83-09 Subject: Section VIII, Division 1; UHA-51(b)(5)(a)(1) Date Issued: July 26, 1982 File: BC82-127 Question: UHA-51(a) exempts impact testing for Type 304L stainless steel for vessels operating at temperatures of -425°F and higher. UHA-51(b)(5)(a)(1) exempts vessel (production) impact tests of welds for Type 304 stainless steel provided that deposited weld metal is of less than 0.10% carbon and is Type 308, 308L, 309, or 316L. Are vessel (production) impact tests of welds for Type 304L also exempted provided they meet the same carbon and Type requirements? Reply: Yes.
From: CHINTUKUMAR GANDHI <cgandhi1975@yahoo.com>
Sent: Fri, 14 Oct 2011 10:22:39
To: materials-welding@googlegroups.com
Cc: Krupa <krupa.padia@petrofac.com>
Subject: [MW:12661] IMPACT TESTING OF S.S. 304 L MATERIAL MDMT -105 C.
--- On Wed, 10/12/11, CHINTUKUMAR GANDHI <cgandhi1975@yahoo.com> wrote:
From: CHINTUKUMAR GANDHI <cgandhi1975@yahoo.com>
Subject:
To: materials-welding@googlegroups.com
Date: Wednesday, October 12, 2011, 3:12 PM
| Dear Experts, Hi, In one of our project, MDMT is -105ꠃ. M.O.C. is S.S. 304L. Client requirement is to consider lower stress value in design. We are going to use ER 308L Filler wire for welding. Can any body explain me below clause of ASME Sec. VIII Div. 1 particulary what is design stress in below clause. As per my opinion, Impact testing is required for Welding proceudre qualification since MDMT is -105ꦮbsp;C. Refering to below clause if coincident ratio is <0.35. Thermal treatment as per UHA-51 (c) is not applicable. UHA-51(g) Exemption From Impact Testing Because of Low Stress. Impact testing of materials listed in Table UHA-23 is not required, except as modified by UHA-51(c), for vessels when the coincident ratio of design stress3 in tension to allowable tensile stress is less than 0.35. This exemption also applies to the welding procedures and production welds for the component. 3 Calculated stress from pressure and nonpressure loadings, including those listed in UG-22 which result in general primary membrane tensile stress. With warm regards, C. R. GANDHI (MANAGER- Q.A/ Q.C.) |
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