ML20203G122

From kanterella
Jump to navigation Jump to search
Metallurgical Analysis of Offgas Sys Adsorber Bed Vessels
ML20203G122
Person / Time
Site: Perry  FirstEnergy icon.png
Issue date: 07/29/1986
From:
CLEVELAND ELECTRIC ILLUMINATING CO.
To:
Shared Package
ML20203G077 List:
References
NUDOCS 8607310340
Download: ML20203G122 (12)
v • d • e


Text

, , _ _ .__. _ -. ._...__ _ ._...__._. _ _ __._ _ ..._._._._.._ . __ _ _____.__ _ _ _ ___.___

1 4

...g -

l l- .

4 l '

I t

l 4

i i

i METALLURGICAL ANALYSES OF THE l

OFF-GAS SYSTEM ADSORBER BED VESSELS l@

2 1 i i

r e

t i

I i

i

[

i

(

. I e t

[

8607310340 860729 PDR ADOCK 05000440 ,

S PDR

! I

p A

V METALLURGICAL ANALYSES OF OFF-GAS SYSTEM ADSORBER BED

S e integrity of the N64 charcoal adsorber vessels was tested in a non-destructive manner. Attachment 1 contains a typical ASME code data report for the adsorber vessels. Metallurgical analyses of the vessel steel were

. performed comparing areas obviously affected by heat (i.e. blistered point areas) with areas that were not blistered. he analyses include an examination of the steel's microstructure via metallurgical replicas, hardness i testing, charpy impact testing of steels similar in chemical composition and processing that were given a simulated temper embrittlement heat treatment and a literature search of existing data dealing with similar steels. Possible i

metallurgical damage occurring due to temperatures reaching 750*F and greater was evaluated by the analyses. Temperatures below 750'F could not cause i

O meta 11ureicai damaee in the vess 1 materia 1. ac8 testine methed is discussed l in detail below.

i j Visual Examination A visual examination of the internal surfaces of the vessel was performed with the unaided eye and by a boroscope. This examination was performed so that gross damage and/or the formation of any black, high temperature oxide scales

]

would be detected. W e lack of a tightly adhering black oxide scale would

]

indicate that the internal vessel surfaces had not experienced temperatures i

i above 1500*F.

l i

O j 0 l

I It was found that the internal surfaces had a comon red oxide rust film visible. 'Ihis extended from the top of the charcoal bed up to approximately the region where the coating on the outside of the vessel had been blistered.

Above this area, a black colored material covered most of the surface with some red rust film showing through in some areas. The nature of the black colored material was determined by attaching a piece of duct tape to the end of a long pole and then wiping the tape across the black colored material. It was found that the black color was easily wiped off. The red oxide film reappeared under the wiped area. From this, it can be concluded that no gross damage occurred, that black oxide scales did not form, and therefore the internal surfaces of the vessel did not exceed 1500'F.

1 Microstructural Comparison O

LJ Replicas of the microstructure of each adsorber bed vessel were taken. Areas l

l where paint had flaked off (i.e., areas that had experienced heat) versus areas where paint had not flaked off (i.e., areas that had not experienced heat) were compared to determine whether there had been any change in grain size or carbide morphology.

This was investigated since an increase in grain size and the presence of i

martensite, coarsened pearlite or precipitated carbide indicates degraded tensile strength and more importantly, degraded impact toughness of the vessel steel. This investigation was performed to identify any change in integrity due to heating ahve 1250*F.

O

A No changes in grain size were observed. All metallurgical replica tj microstructures were determined to have an ASIM grain size range of #9 - 10.

'Ihe microstructure of this SA-516, Grade 70 steel was typical for a low carbon aluminum deoxidized steel of its chemical composition. Its chemical composition was 0.14% C, 1.12% Mn, 0.014% P, 0.030 S and .25% Si. The microstructure consisted of a mixture of ferrite and pearlite where a fair amount of cementite existed as roughly spheroidal particles rather than long thin films in a lamellar structure. The pearlite had not been coarsened by the heat. There also was no martensite nor precipitated carbide present in the microstructure.

Thus, this microstructural analysis has shown that the impact toughness and tensile strengths of the vessel steel have not been impaired. It also indicates that the veld metal joining the vessel steel has not been impaired due to the fact that its chemical composition is similar and that it experienced the same heating cycle.

Hardness Comparison Hardness tests were performed in the same areas where the replicas were taken so as to ensure a uniform test surface. Again, flaked paint areas with non-flaked paint areas were compared. A relative change in hardness would mean that a change in tensile strength had taken place. This test was performed to show any changes due to heating at temperatures from 950*r to 1250'F for an extended time period. It was found that there was no I significant change in the hardness of the vessel steel. The difference in average hardness varied only 12 points on the Brinell Scale which is l

l t

equivalent to only 5 points on the Rockwell B Scale. Thus, this hardness comparison shows that there has been no change in tensile properties in the i vessel steel. It also indicates that the weld metal has not been impaired due to its similar chemical composition and that it experienced the same heating cycle.

Simulated Temper Embrittlement Heat Treatment (Base Metal)

The phenomenon of temper embrittlement cannot be easily ascertained through optical microscopy of the replicas. Therefore, a steel of a similar chemical composition and processing was given a heat treatment to induce temper embrittlement. Charpy impact tests were performed before and after this heat treatment to determine if impact strength had been impaired. A 251, difference

. in impact toughness before and after heat treatment is used as a reference to determine the susceptibility of the vessel steel to temper embrittlement.

This testing was designed to show any change in integrity due to heating at 750'r to 950*r for an extended time period.

Samples of A516, Grade 70 5/8" thick material were impact tested before and after a simulated temper embrittlement heat treatment in the range of 950'r down to 750*F. The step cooling from 950'r held for 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />, down to 850'r held for 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />, down to 750'r held for 15 hours1.736111e-4 days <br />0.00417 hours <br />2.480159e-5 weeks <br />5.7075e-6 months <br /> was chosen since this was considered the optimum temperature range to induce temper embrittlement in a plain carbon steel.

O

_4-O

2 It was found that there was no relative change in impact toughness for the similar SA-516, Grade 70 material before and after the heat treatment. It can be concluded that impact toughness of the vessel steel is not susceptible to temper embrittlement and would not be affected by heating in the range of l

750'r to 950'r for up to 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

h is also indicates that the weld metal is not likely to be susceptible to temper embrittlement due to its similar chemical composition. h is point is further discussed in the literature search review below.

Review of Existing Data and Literature This review was performed in order to confirm that the vessel steel and the weld metal were not susceptible to temper embrittlement. It was found that the vessel steel with its chemical composition, low hardness and its ferrite plus pearlite fine-grained microstructure had a very low probability of being susceptible to temper embrittlement. This is consistent with the positive test results achieved.

The weld metal analysis involved the need to look at the effect of nickel on its susceptibility since the weld metal contained .92% Ni nominally. The nominal weld metal composition as per Lincoln Electric Company is as follows:

3

) .069% C, 1.20 Mn, 0.49% Si, 0.023 P, 0.011% S, 0.92% Ni, 0.03% Cr, 0.01% Mo, 0.089% Cu a,nd V plus Ti plus Zr is less than 0.02%.

O

W e coexistence of alloying elements such as Cr and Mo, (in sufficient amounts), in addition to Ni was needed for the weld metal to be susceptible to temper embrittlement. % e low percentages of Cr and Mo were not sufficient to promote susceptibility in the Perry adsorber vessel steel. %e % C and % P were also low and this also reduces the susceptibility of the steel to temper embrittlement. Therefore, it can be stated that the weld metal has a low susceptibility to temper embrittlement. In addition, the literature indicates that susceptibility to temper embrittlement has not been shown for alloys containing Ni in amounts less than 2 1/2 - 3%. However, it must be noted that data was limited on steels which had Ni contents similar to that of our weld metal. W erefore, additional testing of similar weld metal was conducted.

Simulated Temper Embrittlement Heat Treatment (Weld Metal)

O Preliminary test results of the weld metal indicate that the weld metal also is not susceptible to temper embrittlement, however, final evaluation of the weld metal is not yet complete. This evaluation will be completed the week of July 28, 1986.

Evaluation Of The Need For Additional Metallurgical Testing Due To Combustion Recurrence Temperature data from the second event, visual inspections of the adsorber bed vessels following the second event and photographic comparisons of the adsorber bed vessels following the second event were reviewed and evaluated to determine if additional metallurgical testing was required due to the combustion recurrence. Based upon recorded temperature data and no additional I

O vesset ce ti e d ee. e h ve determi ed th t the eceed ce eestie event did l

not generate the high temperature excursions exhibited during the initial event. Therefore, metallurgical analyses from the initial event envelope the l conditions during the second event and no additional metallurgical evaluations are required.

i

+

O 1

1 i

i 1

4 i

O 1 i O

ATTACHMENT 1 ASME Code Data Report For The Adsorber vessels i

j l

O i

i i

)

l I

e f

l

a IJuninM88VH UNLI recry )

KRM U l M ANtlFACTURER$* DATA RD' ORT FOR PRESSURE VESSELS

, As requirest ley li.c I% sidons of thm ASM E Cop {Raica, Section }'lli. Divistoa I e

). Manufactured by P.X. Engineeris g_Co. , Inc. , 225 Merrimai. St. , Woburn, Mass. .

{M:.- f-!I33::n f 6.::f::!::::r) ,

p) Manufactured for eral DecW 6@any, h Ase, Ca%Ma a.,

(Name and address e4 Parechtser)

' 3. Type i

(f ank, Jacketed,lical Fach.) Vessci No.

465 2 ) Nafl. Bd. No. Yr. Built 1 A7A oria.or Vert.) ( (Mirs.Ser6al)) ((State & State No.)

Items 4-9 incl. to be completed "** for single wall vessel f,uch as air tanks),JatLets of jacketed vessels, or shells of heat enhangerar Nominal Corrosion 1 S jQ

4. SHELL: MateriaiS A516.Gn 2Q T.S. _.20,81.&

000 Spec.Mm.T.S.)Thicknets5/Bln. Allowaned /. Sin. Diam AL Ft. Oln. ten

,(Kind and Spec. No.) (hg.or I. ~lf tiseled dt-S. SEAMS: 14ng Welded Dbl. Yes g,r. .Comotete Sectioned No Efficiency .1QQ.s (Welded, Dbl.,Sinste,t.ap,tsult) n.7, (Yes or No)' (brol or Complete) (Yes ce No)

UnN'E Wise side of Citth Welded Dbl. )i,y, Yes n,y, Cornplete Sectioned No. No.of Course, 2 fonn.

6. HEADS (a) Material SA516 Gr . 70 T.S. 70 000(b) Material ; A'i18 Gr' 70 T.S. - 7n nnn Location Crown Knuckle d tical Conical Hemisptreicat Het Side to Pressure (Top tiottona ends) Ul,ck nes,s P dius Radius allo Apex Anste Redss Diameter (a) Top 1 min. _ 2r (ConsIMrncave Concave)

B otto m ~l , min (b) 21 nnncavo If scmovab!<, bolts used Other fastening (M aterial, Spec. No.,1.S., Site, Number) (Describe or Attach Sketch)

7. STAYBOLTS: If ho!!ow Attachment Fitch X Diam.

(Material) (Site of Holc) (Threade d, Welded) (itoria.) (Vers.) (Nominal)

8. JACKETCIDSURE:

(Describe as egee & weld, bar, etc. If bar, give dimensions,1f t ofted, describe or petch)

Hydrostatic

9. Constructed for ..iax. Min. Temp (when Test allowabic workg press '.350 p,i ,, ,,s. ,,,p.350 'F. less than -20*) -50 .p. bcasom m p,ess _ 5 2 5 pii.

Items ID and il tu (Ucomplctdfor tube sections.

10. TUBE SilECTS: $tationary. Matcrial Diam in. Thickness _ in. Attachment (Kend & Spec. No.) (Subject to Pressure) , ,

(Welded Dotted) 3:loating. Material Diam. In. Thickness _ in. Attachment (Kind & Spec. No.) , .

a'(

\

l. TUBES: Mate:H (Kind & rpec. No.)

O.D. In. Thickness or Cage Number Type (Straight or U)

Items 12-15 iml'to be compk ut for inner chambers of jacketed sessels.or channels of heat eschangers.

Nominal Corrosion

12. SifEtt. Material . _ T.S. Dickness in. Allowance In Diam I't. _ In Irnt,th _ I't. _In. . .

(Kind and Spec. No.) (hg. or F.ls. & Spec. Min. T.S.) ,

If riveted de.

13. SEAMS: Long II.T. . R.T. . Sectioned Efficiency  % scribe seams (Welded,Dbt ,Lngic,I ap,Ilute) (Yes or Noj' (Spot or Com: . te) (Yes or No) futly on re.

tesse side of Guth li.T. R.T. Sectioned No. of courres - form

14. IIEADS (a) Matcrial T.S (b) Matcrial . T.S - _ (c) Maicri.d T.S Crown Knuckle Ethptical Conical licanispherical t'lat Side to Pressure Location Thic kness Radius 1:edes Ratio Apch An;It Haaus Diameter (Conve s or Concave)

(:) Top, bot tom, ends -

(b)Channci ._ __ . . _ . _ . _ __ ._.

(c) Tioatina If removabic, bolts used (a) (bj.

(Material, Spec. No., T.S , Sire, Number) l (c)_ _ _ . . Othcr feti niny (lksrotee or Attach Stetch) flydrostatic

15. Constructed for maA. Mns terup (when pneumatie on "l es t a!!owable workinr, press! pu at mn. temp. ' F. lets llan -20') .
  • l' . Combis.ation hess psi.

licms bclow to I e completed for all vessch where asylnable. ,

16. S AFETY VALVE OUILETS: Nnmber Sire __ Iecation
17. NOZZLI.S l'urpose (Inlet, l<cintorcement glow Outist, Drain) Nntnber Ibm or Sire Type M18e rial nickncu Materii!
  • Attached TC/Cnnhon 3 P"-300_lh. Elg'd SA3bOLEJ _210 Wcidedlull Sample ~

Hyden1 nt 1 L"-300_lb. Elp'.d .SA350 LEI E171) _

WeldcEIsD

( In1et 1 4"-SCl ma _lh W . SA333 G".O e337 Wel det i Full Outlet 1 4 " S C H []O _{3.,W . SA333 Gr.G ,337 _

Welded Full Catbon Load 1 0"-300_lb _Elo'd SA10L__ m.GIS Wddedlull Carbon Unload 1 6" SCH (10_ CappeL d _ _S A3'33 Gr.Dd32 . Wpidedfull l . _ . _ _ . . . .

i 'if postwrld heat trcatret. 'I.ist un&s ecm.ni s othes internal or s st. inal pemurcs with t uino&nt tanptraturc u ber ap;.t.. st.:e

  • i

i FORM U. I. )

, . . . , ,  ; .. ** .. . 4 e

M. INSPECTION blanholes No. .

' Size testion

  • OPENINGS: llandh.ile s, No.

'Ilirceded, No.

Size Sise

. Location Location f['

19, SUPPOftTS: Ski.t 4

February 28.1979 - q , Certificate of Author.ization No. Es p.ires f , ...s . s' .. . CERTIFICATE OF S110P INSPECTION .- .. .. VESSEL MADE DY P.X. Engineering Co. , Inc. .t _ Woburn. - Massarchusetts I, the undersigned, holding a valid commission issued I,y*the National Board of Bolles and Pressere Vwsne1 Inspectors and/or the State E)9#rtpf,ny Mass, and emptoyed by Mutual Boller .f v Norwood. Massachusetts h.v. Inspected the pr..s. vessel described 1. this menefacturer es I dets report on 19 _, and state that to the best of my knowledge and belief, the snanufac. turer has constructed this pressure vessel in accordance with the applicable sections of the ASME Boiler and Pressore vessel Code. , , By signing this certificate melther <the Inspector not his employer raskes any estranty, erpressed or laplied, concerning the pressure vessel described in this snanufacturer's data report. Furthermore, neither the Inspecie nor his employer shall be liable la any enanner for any personal injury or property damage er a loss of any kind erlsing from os connected with this laspection. ~ Date \ . 19 . Commissions /I 7b) I ' .Inspec 're signatuee Nat'l floard, Siate Psevince and No. CE!!TitelCATE OF l'IEl.I ASSEMillJ INSI'EC110N I, the undersigned, holdeng a valid commission issued by the National Daard of luiter and Pressure VesselInspectors and/or ti.e State or Psovins e. and emplopd tf _ . _ _ _ _ . . _ _ . . . _ _ _ _ _ . sf have compared the statementa la this manufacturer's data report with the descrit.e,d pressure vessel and slate that parts seferre.f to es data items _._ _ not included in the certiheate of shop inspection have been lospected t,y sne end that to the best of spy Loomledge and t.ellel the manufacturer has constructed and ensemtfed this pressure vessel in accoidance with the artlicatic sections of the AshlF. Iloiter and Pressure Vessel Code. The described vessel mes lass ected end subjected to a hydrostatic test of psi, t . .. .. . By signing this certi6cate melther the Inspector nor his employer snakes any warranty, espressed or implied, concerning the pressure vessel described in this e anuf acturer's data report. Fu,thermore, ceitt.re the laspector por his employer shall be list,le ) 'in any manner for any pessonal injury or property damage or a loss of any kind arising from or connetted with this inspection. i ,. Date 'ig ( l . f,. . e ! Cornmis sion s i

  • '. s...p c to,'e siganture . . ' N. e'l ilue,J, Sene, Psonince and Ms.

Prinsed in U.S. A. (7/1.)) Thin furne (f:71) is of.i.iin.ihl. freni it.c Assti: Or.h e Dept., } i$ l'..17th Sr., Ne w Yes L, N.Y. INI?

  • nivkinn nr /wt.~.iri nM - FM n. , t e r- v .... ,t f - . , ,- , , rw . , ~ ,
Retrieved from "https://kanterella.com/w/index.php?title=ML20203G122&oldid=3067862"