UCS 85 Interpretation

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Standard Designation: BPV Section VIII Div 1

Edition/Addenda:

Para./Fig./Table No:

Subject Description: Section VIII, Division 1 (1998 Edition, 2000 Addenda); UCS-85(c)

Date Issued: 12/06/2001

Record Number: BC01-341

Historical Interpretation numbers: VIII-1-01-101

Question(s) and Reply(ies): Question: When test specimens are subjected to simulated heat treatment cyclesaccording to UCS-85(c) in Section VIII, Division 1, must the requirementsregarding the preparation of test specimens conform to the material specification,including the referenced general specifications?Reply: Yes.

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Copyright © 2015 by the American Society of Mechanical Engineers. No reproduction may be made of this

material without written consent of ASME

Interpretation Detail




Edition/Addenda:


Subject Description: Section VIII, Division 1 (1998 Edition, 2000 Addenda); UCS-85, Heat Treatment

of Test Specimens




Question(s) and Reply(ies): Question: A hot finished SA-106 Grade B pipe is to be swaged to an ellipticalshape at about 700°C (1292°F) and then normalized or annealed before weldingto the carbon steel vessel, The tensile test properties as shown on the MaterialTest Report exceed the specified minimum tensile strength per the materialspecification. The completed vessel is postweld heat treated per Coderequirements. In meeting the requirements of UCS-85 of Section VIII, Division1, is it required to subject the test specimens to the same heat treatmentconditions as those encountered during fabrication?

Reply: Yes.

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Edition/Addenda:


Subject Description: UCS-85, PWHT of Mechanical Test Coupons (2010 Edition)


Record Number: 11-937


Question(s) and Reply(ies): Question: A pressure vessel shell made of P-No. 1, Group 2 carbon steel that has been normalized by the mill is used to construct a welded pressure vesselsubjected to postweld heat treatment in compliance with the rules of UCS-56during fabrication. Are the additional requirements for mechanical propertytesting prescribed by UG-85 and UCS-85 applicable to this material?Reply: No. See UCS-85(f)

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Edition/Addenda:


Subject Description: UCS-85(f) and UG-84(f)(2), PWHT Exemption (2010 Edition, 2011 Addenda)


Record Number: 11-83


Question(s) and Reply(ies): Question: in UG-84(f)(2), does the reference to UCS-85 and the included provisions of UCS-85(f) allow the weld metal and HAZ impact test specimensets removed from the weld test coupon to be impact tested without applyingsimulated heat treatments representing PWHT below the lower criticaltemperature?Reply: No.

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Edition/Addenda:


Subject Description: Section VIII-1, UG-79, UW-11, UCS-57, and UCS-85




Question(s) and Reply(ies): Question (1): Is it a requirement under UW-11 of Section VIII, Division 1 toradiograph the butt welds within dished heads and longitudinal welds in shells of vessels if welding is carried out prior to forming the dished heads and/or shellswhen the design stresses of the vessel are based on visual inspection?Reply (1): No.

Question (2): Is there any Code restriction for the minimum distance betweentwo longitudinal welds in the same course of the shell or distance between twoconsecutive circumferential welds?

Reply (2): No.

Question (3): Are the requirements of Section VIII, Division 1 for radiographyand heat treatment applicable to joints in flanges fabricated from plate?

Reply (3): Yes.

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Edition/Addenda:


Subject Description: Section VIII-1, UCS-85




Question(s) and Reply(ies): Question (1): Under the requirements of UCS-85(b) in Section VIII, Division 1,material from which test specimens are prepared shall be heated at the specifiedtemperature within reasonable tolerance, such as are normal in actual fabrication.What is a reasonable tolerance?Reply (1): A reasonable tolerance depends on the heat treating response of thespecific materials.

Question (2): Under the requirements of UCS-85(b) in Section VIII, Division 1,may the total time at temperature when postweld heat treating the test specimens

be greater than 100% of the total time at the PWHT temperature during actualfabrication of the product?

Reply (2): Yes.

Question (3): If the material (SA-387 Grade 11, Class 2) is supplied innormalized and tempered condition, and the material is subjected to postweldheat treatment during fabrication at a temperature which is below the temperingtemperature at the mill, must the test specimen material heat treatment includesuch postweld heat treatment?

Reply (3): Yes.

Question (4): If the material, SA-204 Grade B, 1 in. thick, is furnished by themill with test results in the as-rolled condition and in the simulated heat treatedcondition, including postweld heat treatment, is it still required to conduct thetests required by UCS-85 for the following three cases? (a) The material is

subjected to postweld heat treatment during fabrication at a temperature rangeabove the minimum temperature and the minimum hold times required by TableUCS-56 but below the specified temperature range performed during thesimulated postweld heat treatment at the mill. (b) The material is subjected to

postweld heat treatment during fabrication at a temperature range above theminimum temperature and the minimum hold times required by Table UCS-56

but for hold times which do not satisfy the requirements of UCS-85 compared tothose performed during the simulated postweld heat treatment at the mill. (c) Thematerial is subjected to a postweld heat treatment temperature range duringfabrication at the alternate postweld heat treatment temperatures and longer holdtimes of Table UCS-56.1 instead of the simulated postweld heat treatmenttemperature range and hold time performed at the mill, and which met therequirements of Table UCS-56.

Reply (4): The answer in all cases is yes.

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Edition/Addenda:


Subject Description: Section VIII-1, UCS-85(b)




Question(s) and Reply(ies): Question: Would the requirements of UCS-85(b) of Section VIII, Division 1 bemet if test plates in the normalized condition are used to represent P-No. 1,Grade Nos. 1 and 2 material, both in the normalized and as-rolled condition?Reply: No.

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Edition/Addenda:


Subject Description: Section VIII-1, UCS-85(b) and (e)




Question(s) and Reply(ies): Question (1): A dished head made of P-No. 1 Gr. Nos. 1 and 2 material with athickness of less than 1¼ in. is hot pressed at a temperature of 1750°F. Are testspecimens required under UCS-85 of Section VIII, Division 1, to establish themechanical property of the material?Reply (1): Yes.

Question (2): If the head described in Question (1) is welded to the shell and then postweld heat treated at 1150°F, are additional test specimens simulating the postweld heat treatment required?

Reply (2): No.

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Edition/Addenda:


Subject Description: Section VIII-1, UG-11, and UCS-85, Low Alloy Tubes and Pipes




Question(s) and Reply(ies): Question (1): May low alloy steel pipes procured in other than annealedcondition in accordance with an ASME Section II Specification and used asnozzle pipes on low alloy steel equipment be exempted from the requirements of UCS-85(b)?Reply (1): No.

Question (2): May low alloy steel pipes procured in other than annealedcondition in accordance with an ASME Section II Specification in standardlengths and used as heat exchanger tubes in low alloy steel equipment be

exempted from the requirements of UCS-85(b)?Reply (2): No.

Question (3): May low alloy steel tubes procured in other than annealedcondition in accordance with an ASME Section II Specification in standardlengths and used as heat exchanger tubes in low alloy steel equipment beexempted from the requirements of UCS-85(b)?

Reply (3): No.

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Edition/Addenda:


Subject Description: Section VIII-1, UCS-85(b)




Question(s) and Reply(ies): Question (1): Are material test specimens exempted from heat treatment under UCS-85(b) when the material, which is a P-No. 1, has undergone heat treatmentduring fabrication of the vessel above the critical temperature, followed by

postweld heat treatment?Reply (1): No. The specimens must be subjected to the same manner of heattreatment, including postweld heat treatment, as the material used in the vessel,since the heat treatment during fabrication exceeded the critical temperature.

Question (2): Is it the intent of UCS-85(b) to test each plate, as defined by, the

test requirements of the material specification, which has undergone a particular heat treatment?

Reply (2): Yes.

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Edition/Addenda:


Subject Description: Section VIII-1, UCS-85(c), Local Heating of Shell Plate




Question(s) and Reply(ies): Question: UCS-85(c) describes some cases of local heating which are not to beincluded in heat treatment. Is it intended that local heating above the lower critical temperature for the hot forming of shell plate be included in heattreatment?Reply: Yes.

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Edition/Addenda:


Subject Description: Section VIII, Division 1, UG-85 and UCS-85




Question(s) and Reply(ies): Question: A pressure part requiring PWHT is being fabricated from P-No. 1Group Nos. 1 and 2 materials in the rolled (not annealed) condition. Inaccordance with UG-85 and UCS-85, is a simulated PWHT required for testspecimens representing the materials used in this part?Reply: Yes.

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Edition/Addenda:






Question(s) and Reply(ies): Question: A pressure part requiring PWHT is being fabricated from P-No. 1Group Nos. 1 and 2 materials in the rolled (not annealed) condition. Inaccordance with UG-85 and UCS-85, is a simulated PWHT required for testspecimens representing the materials used in this part?Reply: Yes.

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Edition/Addenda:




Record Number: BC87-019*

Historical Interpretation numbers: VIII-1-86-125R

Question(s) and Reply(ies): Question: A pressure part requiring PWHT is being fabricated from P-No. 1 Gr. Nos. 1 and 2 materials in the as-rolled condition. Are simulated PWHT testspecimens, in accordance with UCS-85(b), required when the heat treatmentduring fabrication is limited to PWHT at a temperature below the criticaltemperature of the steel?Reply: No.

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Edition/Addenda:


Subject Description: Section VIII, Division 1, UCS-85(b), and Division 2, AT-112




Question(s) and Reply(ies): Question: If hardness testing is a requirement of the original materialspecification, do UCS-85(b) of Section VIII, Division 1 and AT-112 of Division2 require hardness testing to be performed on the test specimens representing thematerial after heat treatment?Reply: Yes. Note: This Interpretation also appears as VIII-2-86-16.

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Edition/Addenda:


Subject Description: Section VIII-1, UCS-85(b), Hot Forming and Heat Treatment




Question(s) and Reply(ies): Question: For vessels built to the rules of UCS-85(b) of Section VIII, Division 1,does the term "heat treatment" include heating for the sole purpose of hotforming?Reply: No. See ASTM Definitions E 44, the second sentence of the definition of "heat treatment."

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Edition/Addenda:


Subject Description: Section VIII, Division 1 (1992 Edition); UCS-85(b), Hot Forming and Heat

Treatment


Record Number: BC85-140*

Historical Interpretation numbers: VIII-1-86-27R

Question(s) and Reply(ies): Question: For vessels built to the rules of UCS-85(b) in Section VIII, Division 1,does the term "heat treatment" include heating for the sole purpose of hotforming?Reply: Yes.

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Edition/Addenda:


Subject Description: Section VIII-1, UCS-85, Heat Treatment




Question(s) and Reply(ies): Question: During the fabrication of a nonimpact tested pressure vessel madefrom SA-516 Grade 70 that is 5 in. thick, normalization of the material isconducted by the fabricator as a part of a hot forming process. In order to satisfythe requirements of UCS-85: (a) are mill test specimens required to have the heattreatment associated with the hot forming simulated? (b) is it required that themanufacturer define for the mill the anticipated cooling rate from the criticaltemperature during the hot forming operation?Reply: (a) Yes. (b) Yes.

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Edition/Addenda:


Subject Description: Section VIII-1, UCS-85(b), Heat Treatment of Test Specimens




Question(s) and Reply(ies): Question: May the test specimen requirements of UCS-85(b) be waived for fluedopenings in a shell made by the following conditions? (1) The vessel is not usedto contain a lethal substance. (2) The material is SA-516M Grade 415, and doesnot require impact testing. (3) Diameter of shell is approximately 900 mm, andopening diameter is over one-third of the shell diameter. The distance betweenopenings is not less than 2.5 times the opening diameter and nominal thicknessof shell before forming is less than 10 mm. A nozzle is welded to the formedopening. Reduction in thickness due to forming is compensated by thereinforcement calculation for opening. (4) Only the surrounding area of opening

to be formed is preheated locally by using a gas burner at 950°C-1100°C (abovethe lower critical temperature of material), and forming is done by dropping thedie immediately after preheating. (5) All weldments of the vessel shell aresufficiently distant from the opening, and the temperature of the weldments doesnot exceed the critical temperature during preheating for forming. The vesseldoes not require postweld heat treatment.Reply: No.

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Edition/Addenda:


Subject Description: Section VIII, Division 1 (1986 Edition, 1988 Addenda), UCS-85




Question(s) and Reply(ies): Question: Is simulation heat treatment of test specimen required for speciallydesigned cast or wrought fittings in the nonannealed condition conforming to oneof the specifications listed in P-No. 1, Gr. Nos. 1 and 2 of QW-422? The heattreatment during the fabrication process will be limited to postweld heattreatment at a temperature below the lower transformation temperature for thematerial.Reply: No.

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Edition/Addenda:


Subject Description: Section VIII, Division 1 (1986 Edition, 1988 Addenda), UCS-85(d)




Question(s) and Reply(ies): Question: A nozzle made from SA-335 Grade P5 material with dimensions inaccordance with ANSI B36.10 is welded to the wall of a vessel. Is simulated heattreatment of test specimens required of the nozzle neck when the heat treatmentof the vessel is limited to PWHT at a temperature below the lower transformationtemperature of the material?Reply: Yes; see UCS-85(b).

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Edition/Addenda:


Subject Description: Section VIII, Division 1 (1986 Edition, 1987 Addenda), UCS-85




Question(s) and Reply(ies): Question: A vessel made from P-No. 1 Group No. 1 or 2 material is to undergotwo heat treatments during fabrication, i.e., normalizing above the criticaltemperature and a postweld heat treatment. If the coupon representing thematerial undergoes only the normalizing above the critical temperature heattreatment, do the test results obtained from this coupon satisfy the requirementsof UCS-85?Reply: Yes.

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Edition/Addenda:


Subject Description: Section VIII, Division 1 (1989 Edition), UCS-85(b) and (e)




Question(s) and Reply(ies): Question (1): Is heat treatment of test specimens under UCS-85(b) required for material listed in P-Nos. 3, 4, and 5 of QW-422 when: (a) the heat treatmentduring fabrication will be limited to PWHT at a temperature below the lower transformation temperature of the materials? (b) the heat treatment duringfabrication will be limited to normalizing and tempering per the materialspecification followed by PWHT at a temperature below the lower transformation temperature of the material?Reply (1): (a) Yes. (b) Yes.

Question (2): May a material manufacturer perform the simulated heat treatmentof test specimens required by UCS-85(b)?

Reply (2): Yes.

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Edition/Addenda:


Subject Description: Section VIII Division 1, UCS-85




Question(s) and Reply(ies): Question (1): If plates that have been normalized, and qualified on the basis of test specimens taken from the plates after normalizing, are subsequently heatedto equivalent temperatures above the lower transformation temperature duringhot forming, are additional test specimens representative of the second thermalcycle required by UCS-85?Reply (1): No, provided all other requirements of UCS-85 are met.

Question (2): If plates supplied in the as-rolled condition with qualification basedupon simulated normalizing of test coupons are heated for forming to a

temperature within a reasonable tolerance of that used to qualify the testcoupons, are additional test coupons required?

Reply (2): No, provided all the other requirements of UCS-85 are met.

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Edition/Addenda:


Subject Description: Section VIII, Division 1 (1989 Edition, 1990 Addenda); UCS-85(b)




Question(s) and Reply(ies): Question: A pressure vessel part, e.g., head, is subjected to heating between thelower transformation temperature and normalizing temperature during its hotforming process, then followed by a normalizing heat treatment above the lower transformation temperature upon completion of forming. Is it required under the

provisions of UCS-85(b) in Section VIII, Division 1 to have a simulation testspecimen for both hot forming and normalizing heat treatment?Reply: No, a test specimen would not be required for hot forming.

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Edition/Addenda:


Subject Description: Section VIII, Division 1 (1998 Edition); UG-11(a)(1) and UCS-85(e)




Question(s) and Reply(ies): Question: Would a pipe such as SA-333 Grade 3 be considered a standard itemsuch as described in UG-11(a) of Section VIII, Division 1 if it is used as a nozzlein a pressure vessel?Reply: No.

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Edition/Addenda:






Question(s) and Reply(ies): Question: If hardness testing is a requirement of the original materialspecification, do UCS-85(b) and AT-112 of Section VIII, Divisions 1 and 2require hardness testing to be performed on the test specimens representing thematerial after heat treatment?Reply: Yes.

Note: This interpretation also appears as VIII-1-86-194.

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Edition/Addenda:






Question(s) and Reply(ies): Question: If hardness testing is a requirement of the original materialspecification, do UCS-85(b) and AT-112 of Section VIII, Divisions 1 and 2require hardness testing to be performed on the test specimens representing thematerial after heat treatment?Reply: Yes.

Note: This interpretation also appears as VIII-1-86-194.

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Edition/Addenda:


Subject Description: Section VIII, Division 1, UCS-85(b) and (d)


Record Number: NA

Historical Interpretation numbers: VIII-77-33

Question(s) and Reply(ies): Question: Is pipe, procured in accordance to a specification in Section II for usein nozzles in a Code vessel, considered a standard pressure part under the

provisions of UG-11 and exempted from the provisions of UG-85 andUCS-85(b) under UCS-85(d)?Reply: The pipe described in the question, where used in the fabrication of nozzles, would not be covered under the provisions of UCS-85(d) wherereference is made to standard items described in UG-11. Therefore, this wouldrequire test specimens as described in UCS-85(b).

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Edition/Addenda:


Subject Description: Section VIII, Division 1, UCS-85(b) and (e)


Record Number: NA

Historical Interpretation numbers: VIII-77-33R

Question(s) and Reply(ies): Question: Is pipe, procured in accordance to a specification in Section II for usein nozzles in a Code vessel, considered a standard pressure part under the

provisions of UG-11 and exempted from the provisions of UG-85 andUCS-85(b) under UCS-85(e)?Reply: The pipe described in the Question, where used in fabrication of nozzles,would not be covered under the provisions of UCS-85(e) where reference ismade to standard items described in UG-11. Therefore, this would require testspecimens as described in UCS-85(b).

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Edition/Addenda:


Subject Description: Section VIII, Division 1, UCS-85(b)


Record Number: BC-78-173


Question(s) and Reply(ies): Question: Is it the intent of UCS-85(b) to exclude heat treatment specified thereinfor the following items? (a) flanges and elbows complying with UG-11(a),covered by ANSI B 16.5 and ANSI B16.9 constructed of materials permitted bythose Standards; and (b) flanges complying with Appendix II constructed of P-No. 1 materials.Reply: Yes.

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Edition/Addenda:


Subject Description: Section VIII, Division 1, UCS-85




Question(s) and Reply(ies): Question: UCS-85(e) exempts materials classified as P-No. 1 Group Nos. 1 and2 of QW-422 of Section IX from the requirements of UCS-85(b) when the heattreatment during fabrication is limited to postweld heat treatment. For dishedheads made of material classified as P-No. 1 Group No. 1 or 2, such as SA-515or SA-516 plate material, and which are hot formed in the normalizing range andsubsequently postweld heat treated, is it required to carry out the testing of thecoupons in accordance with UCS-85(b) using the same heat treating cycle andsubsequent postweld heat treatment?Reply: Yes.

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Edition/Addenda:


Subject Description: Section VIII, Division 1, UCS-85




Question(s) and Reply(ies): Question (1): Is it a requirement of Section VIII, Division 1, UG-85 thatsimulation of postweld heat treatment of mechanical test coupons be performed(either by the mill or the vessel manufacture) on P-No. 1, Group No. 1 or 2materials which are to be postweld heat treated during fabrication per UCS-56?Reply (1): No. See requirements under UCS-85(e) of Section VIII, Division 1.

Question (2): Should such a test be performed on a coupon taken from a vesselso heat treated, where the test results show a reduction of tensile strength belowthat stated by the material specification in Section II and as reported on the

original mill test report, would the vessel be in compliance with Section VIII,Division 1 by reason of Section VIII, Division 1 acceptance of the fact theoriginal mill test report was in compliance with Section II?

Reply (2): Yes; however, a Designer should give consideration to results andservice condition for the vessel and be responsible for the use of such material.

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Edition/Addenda:


Subject Description: Section VIII, Division 1, UCS-85(b)




Question(s) and Reply(ies): Question: Is it permissible under the requirements of UCS-85(b) Section VIII,Division 1 to fabricate a vessel from P-No. 4 plate material and stress relieve itat 640°C or 700°C when the plate was tempered at 680°C?Reply: Plate material which has been tempered at 680°C by the mill should not

be stress relieved at any temperature above that. Care must be taken to assurethat the tensile properties of the material are not altered by too high a stressrelieving temperature. ATTENTION

The foregoing interpretation has been further considered and the following

corrected interpretation sent to the inquirer.Correction Issued: February 15, 1980

Reply: Plate material which has been tempered at 680°C by the mill may bestress relieved at a temperature above that, provided that test coupons for the

plate reflect all heat treatments that the material is subjected to including postweld heat treatments.

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Edition/Addenda:




Record Number: BC-79 -700


Question(s) and Reply(ies): Question: In the fabrication of a dished end using plate material SA-285 GradeC, SA-515 Grade 70, and SA-516 Grade 70, which is annealed after forming, is ita requirement of UG-85 and UCS-85 of Section VIII, Division 1 to call for anadditional test coupon with our normalizing cycle of the dished end?Reply: The requirements of Section VIII, Division 1 do not specifically requestannealing; however, a test coupon would be required if annealing is done.

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Edition/Addenda:


Subject Description: Section VIII - Division 1, UCS-85(b)




Question(s) and Reply(ies): Question: Would the requirements of UCS-85(b) of Section VIII - Division 1 bemet if test plates in the normalized condition are used to represent P No.-1 Gr.

Nos. 1 and 2 material both in the normalized and as-rolled condition?Reply: No. A normalized test plate may not be used to represent material whichhas been furnished in the as-rolled condition regardless of later formingoperations.

ATTENTION

The foregoing interpretation has been further considered and the following

corrected reply sent to the inquirer.

Correction Issued: July 23, 1980

Reply: No. The heat treatment condition of the test plate must be the same as thatin which the Material Specification and additional Code requirements arecertified. For plate furnished and certified in the as-rolled condition, the test plateshould be in the as-rolled (plus any PWHT) condition. For plate furnished ineither the as-rolled or normalized condition, but certified on the basis of materialor test coupons in the normalized condition, the test plate should be in thenormalized condition (plus any PWHT).

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Edition/Addenda:


Subject Description: Section VIII - Division 1, UCS-85(e)




Question(s) and Reply(ies): Question (1): Is it the intent of UCS-85(e) to exempt materials conforming to oneof the Specifications listed in P-No. 1, Group Nos. 1 and 2, of QW-422, SectionIX, from the requirements of UCS-85(b)?Reply (1): Yes.

Question (2): Would the same exemption as referenced in Question (1) apply toother carbon and low alloy steels which are not in the fully annealed condition

but are quenched and tempered?

Reply (2): No.

Question (3): Is the requirement mentioned under Question (1) also valid for tubesheets with butt welded hubs?

Reply (3): Yes.

Question (4): Is it possible to do the tests on the specimens which have beensubjected to simulated PWHT at either the location of the vessel manufacturer or the manufacturer of the semifinished material?

Reply (4): Yes.

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