2021-06-24_REVISION - M2012032

• Permit No: M2012032
• IBM Index Class Name: Revision
• Doc Date: 6/24/2021
• Doc Name: Adequacy Review Response #3
• From: Ouray Silver Mines, Inc.
• To: DRMS
• Type & Sequence: TR14
• Email Name: LJW
• Media Type: D
• Archive: No

ASME B31.3-2016
(3) at temperatures below the creep range,for bolt- (e) Application Limits. Application of stress values
ing materials whose strength has been enhanced by heat determined in accordance with para.302.3.2(d)(3)is not
treatment or strain hardening, the least of one-fifth of recommended for flanged joints and other components
ST, one-fourth of the tensile strength at temperature, in which slight deformation can cause leakage or
one-fourth of Sy,and two-thirds of the yield strength at malfunction.
temperature (unless these values are lower than corres- (1) These values are shown in italics or boldface in
ponding values for annealed material,in which case the Table A-1, as explained in Note (4a) to Appendix A
annealed values shall be used) Tables.Instead,either 75%of the stress value in Table A-1
(4) two-thirds of the yield strength at temperature or two-thirds of the yield strength at temperature listed
[see para. 302.3.2(f)] in the BPV Code, Section II, Part D, Table Y-1 should
(5) 100% of the average stress for a creep rate of be used.
0.01%per 1 000 h (2) Stress values determined in accordance with
(6) 67%of the average stress for rupture at the end subpara. (d)(3) are not identified in Table A-IM. See
of 100 000 h Note(4b)to Appendix A.When using Table A-IM,two-
(7) 80% of minimum stress for rupture at the end thirds of the yield strength at temperature listed in the
of 100 000 h BPV Code,Section II,Part D,Table Y-1 should be used.
(b) Gray Iron. Basic allowable stress values at temper- (f) Unlisted Materials. For a material that conforms to
ature for gray iron shall not exceed the lower of the para. 323.1.2,the tensile (yield)strength at temperature
following: shall be derived by multiplying the average expected
(1) one-tenth of the specified minimum tensile tensile (yield) strength at temperature by the ratio of
strength at room temperature ST (Sy) divided by the average expected tensile (yield)
(2) one-tenth of the tensile strength at temperature strength at room temperature.
[see para. 302.3.2(f)]
302.3.3 Casting Quality Factor, E,
(c) Malleable Iron. Basic allowable stress values at tem- (a) General. The casting quality factors, Ec, defined
perature for malleable iron shall not exceed the lower herein shall be used for cast components not having
of the following: pressure—temperature ratings established by standards
(1) one-fifth of the specified minimum tensile in Table 326.1.
strength at room temperature
(2) one-fifth of the tensile strength at temperature (b) Basic Quality Factors. Castings of gray and mallea-
ble iron,conforming to listed specifications,are assigned
[see para. 302.3.2(f)]
a basic casting quality factor, Ec, of 1.00 (due to their
(d) Other Materials. Basic allowable stress values at conservative allowable stress basis).For most other met-
temperature for materials other than bolting materials, als,static castings that conform to the material specifica-
gray iron,and malleable iron shall not exceed the lowest tion and have been visually examined as required by
of the following: MSS SP-55, Quality Standard for Steel Castings for
(1) the lower of one-third of ST and one-third of Valves, Flanges and Fittings and Other Piping
tensile strength at temperature Components — Visual Method, are assigned a basic
(2) except as provided in (3) below, the lower of casting quality factor, Ec, of 0.80. Centrifugal castings
two-thirds of Sy and two-thirds of yield strength at that meet specification requirements only for chemical
temperature analysis, tensile, hydrostatic, and flattening tests, and
(3) for austenitic stainless steels and nickel alloys visual examination are assigned a basic casting quality
having similar stress—strain behavior,the lower of two- factor of 0.80. Basic casting quality factors are tabulated
thirds of Sy and 90% of yield strength at temperature for listed specifications in Table A-IA.
[see (e) below] (c) Increased Quality Factors. Casting quality factors
(4) 100% of the average stress for a creep rate of may be increased when supplementary examinations
0.01%per 1 000 h are performed on each casting.Table 302.3.3C states the
(5) 67%of the average stress for rupture at the end increased casting quality factors,Ec,that may be used for
of 100 000 h various combinations of supplementary examination.
(6) 80% of the minimum stress for rupture at the Table 302.3.3D states the acceptance criteria for the
end of 100 000 h examination methods specified in the Notes to
(7) for structural grade materials, the basic allow- Table 302.3.3C.Quality factors higher than those shown
able stress shall be 0.92 times the lowest value deter- in Table 302.3.3C do not result from combining tests
mined in paras. 302.3.2(d)(1) through (6) (2)(a)and (2)(b),or (3)(a)and (3)(b). In no case shall the
In the application of these criteria, the yield strength quality factor exceed 1.00.
at temperature is considered to be SPRY; the tensile Several of the specifications in Appendix A require
strength at temperature is considered to be 1.1STRT. machining of all surfaces and/or one or more of these