ML20237H291

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Forwards Completed Questionnaire Re Erosion & Corrosion Experience at Plant,Per NRC 870716 Request
ML20237H291
Person / Time
Site: Trojan File:Portland General Electric icon.png
Issue date: 08/21/1987
From: Cockfield D
PORTLAND GENERAL ELECTRIC CO.
To:
NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
TAC-65727, NUDOCS 8708240420
Download: ML20237H291 (40)
v • d • e


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_ Portland General ElechicCompany I

see David W. Cockfield Vice President, Nuclear August 21, 1987 I,

l Trojan Nuclear Plant Docket 50-344 License NPF-1 U.S. Nuc1 car Regulatory Comm3ssion Attention:

Document Control Desk Washington DC 20555

Dear Sir:

Trojan Erosion / Corrosion Questionnaire Your letter of July 16, 1987 requestod that Portland General Company com-plete a questionnaire regarding crosion/ corrosion experience at the Trojan Nuclear Plant. Our completed questionnaire is attached. Should you have any questions or comments, please do not hopitate to contact me.

Sincerely, Attachment c:

Mr. John B. Martin, Administrator Region V U.S. Nuclear Regulatory Commission Mr, R. C. Barr NRC Resident Inspector Trojan Nuclear Plant Mr. David O. Kish, Director State of Oregon Department of Energy 0\\

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121 S.W Sdmon Street. Portland, Oregon 97204

$ Tro3hn Nuclear Plant

. Docket $ 50-344 Enclosure j

l$censeNPF-1 l

Document Control Desk August 21, 1987 I

PWR EROSION-CORROSION Q' QUESTIONNAIRE (Check or Circle All Applicable)

)

Utility Company: PORTL AND GENERAL EL ECTRIC Unit Name s 1ROJAN MWe 1130 filled by:

c.

L.

hearingen Date:

7/21 /87 Phone No.(503)556-3713 ext. 322 Commercial

  • M service: 19

.7.4.

Water Treatment: [~AYT) with artmonia, morpholine.[hydrazinQ Condensate polishers: none, cation.(powdexl, mixed bed

.100..% of feedwater flow; instal 1ed 19.7.4. ; operated in:[H-OH.T NH4-OH form.

Cooling water: fresh, salt, brackish. (cooling tower).

(Replaced N Copper alloy condenser tubing: yes.Lrigl Copper alloy FW heater tubes:

low load soaks. fot'idr).Lnon LP, HP

.l Jti 1 Boric acid used since: 19 73..; during:(operation) layup, P A Heat-up A.

EROSION-CORROSION EXPERIENCE (Continuation Sheet attached) yes Q) % no.

1.

Erosion-Corrosion Identified in wet steam piping:

2.

Erosion-Corrosion of (MSR Chevrons) or mesh:

9). ' E/C of MSR shell and welds Chevron material: Esta i n l ess stee l), carbon stee l, other.....................

3.

Erosion-Corrosion of feedwater piping: (yes), no.

Date found.)?Q5...............

(

..PM P$ tee!W.....................................

Feedwater piping materials:

4.

Erosion-Corrosion of: 7.8 8.. e lbows..~ J P. Ts..v.14 diffusers.......; reducers, 98' core RepleoEeDalves..... ori flCes..... other components (specify) S/9.E4ehotg W;1g.

5.

Erosion-Corrosion of J-Tubes: (ges) no.

Inserts 6.

Erosion-Corrosion of feedwater distribution ring: yes.@ (see ettached) 7.

Erosion-Corrosion of turbine:

HP. @ identify components: her.ct.tscheJ0.........

8.

Eros ion-Corros ion of other cyc l e components ( i dent i fy). her.gtpggq,d)...........

9.

Feedwater temperature range where erosion-corrosion founds from 729'.F to.4M.. f A

10.

Inspection frequency for feedwater piping..l.. years. Steam lines..).. years.

II.

Inspection methods used: (ultrasonic thicknes@. radiography, (visual), other......

B.

PIPING DESIGN 1.

Maximum feedwater flow veloci ty. 9.22....... feet /second.

2.

No. of feed pumps operating at 100'A load.. ?..... second pump On at. 29.% load.

3.

Maximum flow velorIty when only I pump is operating.....atH....... feet /second.

4.

No. of feedwater piping components:. 12,8... elbows.

.?)... Ts..1?... diffusers.

.. 9.. reducers.. 42... valves......d. or i fices. (venturi)

(see attached)

...... Other components (specify) 5.

Maximum flow velocity in wet stean pipino..1g2....... feet /second. Extracdon Stm. to 6.

Feedwater pressures and temperatures (preferred) or design):D W Heater Full load (pressure, psla/ temperature, f):

P: 47P.9%19 P: 4#9.RSi9 P 19P. esig P: l145. Psig ' P: 974 Ps19 T: 10P!E.

T: 1# F.

T: 16,4lF T:.1q6.' f T: H0'f.

p V

a gJ yn u

u Con nsate Pump Cond. Polishers BF Pump Steam Generators O

Low load (typteal.dP.'1 of ful l load):

P:.d.79.9519, P.dPP.P.S 10 P: 19P.e519 P: ll2,5,psig p 1050,psig T: 1M

  • F.

T: 1P9 *.F.

T: 29,4;F.

T:

29,5 ' F T: 348lF I, V O-O-JD F Punp M

=

Con nsate Pump Cond. Polle.hers B

Steam Generators j

Please attach cooles of the heat balance diaorams for your actual full load and typical low load.

J

i t

PWR EROSION-CORROSION QUESTIONNAIRE TROJAN NUCLEAR PLANT Continuation Sheet A.

EROSION-CORROSION EXPERIENCE 6.

Erosion-Corrosion of feedwater distribution ring:

No Steam Generator feedwater nozzle inserts replaced in 1987.

7.

Erosion-Corrosion of turbine:

LP Identify components:

Very minor erosion on last stage bucket on LP turbine.

8.

Erosion-Corrosion of other cycle components:

Heater drain pump discharge. piping extraction steam piping, steam trap piping, heater drain piping, heater vent piping.

B.

PIPING DESIGN 4.

Discharge of feed pumps to steam generator including feed pump recirc.

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C.

FEE 0 WATER AND CONDENSATE CHEMISTRY i

I 1.

Please complete the attached Table.

2.

Feedwater chemistry history (average or typical values, final feedwater):

Year of oper. :

1st 1974 1976 1978 1980 1982 1983 1985 M

1987 pH of FW maximum.

9.3 9.3 9.48 9.05 9.0 9.3 9.25 9.1, j

minimum.

6.8 8.5 8.3 8.5 8.6 8.5 8.1

.U, j

average.

8.7 9.o 8.8 8.9 8.85. 8.7 8.7 8.9, pH of condensate n.sximum.

9.6 10.2 9.39 9.2 9.1 9.25 9.4 9.1, minimum.

6.1 7.58 7.9 8.1 8.5 7.6 7.9 8.5,

& L_.

8.9 8.8 8.7 8.9 8.8 8.7 8.9 average.

00 ppb maximum.

to 60 80 400 40 46 44 20 minimum.

5 4

1 5

4 2

2 2

average.

20 15 6

12 10 10 6

5 Cat. Cond. uS/cm.

o.5 o.25 o.2 o.3 o.2 o.15 o. 3_,,,, 0.2 Spec. Cond. uS/cm.,_ _.

2.0 1.o 1.9 2.0 1.9 1.5 2.0 2.0 NH. ppb o.18 o.18 o.2 o.15 o.2 o.2a o.20 23 3

NM4, ppb 80 10 40 40 30 30 35

,,35 rOn ppb

<o.1 600 1000 300 5000 400 1_000

.<o.1 Air Inteakage.

SCFM 90 80 15 10 8

10 8

8 Please send any water chemistry sununary reports and data.

3.

Chemical additions N

3.1 Ammonia typical concentrat ion in feedwater.... ppbs added at

,o,t,,a,d,d,e,d,,,

3.2 Hydrazine typical concentration in feedwater.3.9. ppbs added at co,nt,(ngqqs 3.3 Boric acid:

typical concentration in feedwater $1... ppb as B; added at..S.tPr!rYP.........

D.

MATERIALS 1.

Feedwater piping - list ASTM or other specification numbers.(?te. 8!18.cp94,sp?ci,f,1 cat. ions for Feedwater piping)

(..Spe,a,t;ac,h,ed,speQf,1ca t,1,ons,for 2.

Wet steani piping:

Extraction Steam piping) 3.

Attach results of chemical analysis by you or pipe vendors.

l (See attached analysis s eLJ1ts on f ailed Heater Drain Line) 70/ Doc 4 1

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. sos No. 6478 f[C L'

PI?HM DESIm '5C AT r n ta r im a rv.1 1

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f' PORTLAND GENER AL ELECTRIC COMPANY M.301 T/2 TROJAN NUCLE AR PLANT PORTLAND OREGON SHEET ll* 16

CLASS : ceo PRIMARY R ATING 900

mS

CARBON $ TEEL CODE: POWER PIPING CODE, ANSI B31.1

(

ITEM l MATERIAL SPECIFICATION l SIZE I

REMARKS

.o.,,

26" & LARGER 1%" AND SMALLER SCH. 30 l

Eo PlPE:

, ASTM A155, GR. KC70, CLASS 1, SCH.160 jj

[

ISE AM WELD ED) 2" SCH.B0 o

,'5 ASTM A106, GR. B, 24" & SMALLER 2%" TH RU 6" 7$

SCH.100 8" THRU 24"

&v7)P (SEAMLESS)

M IN.1.603" 6 3 30~

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ASTM A234 GR.WPSW 26" & LARGER SEAM WELDED, BUTT WELDING, WALL

{

5* j, (ASIS, GR. 70 PLATE)

THICKNESS TO MATCH P1PE.

.b ASTM A234, GR. WPS 2%" THRU 24" SEAMLESS, BUTT WELDING, WALL THICKNESS TO MATCH PIPE.

lj!

ASTM A105 2" & SMALLER 3000 # SOCKET WELQiNG.

.k *k j

FLANGES:

ASTM A105, F&D, 3" THRU 24" 900 # WELDING NECK, SMALL T&G g5 BORED TO MATCH PIPE 2%"

1500 8 WELDING NECK. SMALL T&G 2" & SMALLER 1500 i SOCKET WELDING, LARGE T&G I

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ASTM A515,GR,70 gj f

VALVE ASTM A216, GR. WCB 2%" & LARGER CASTINGS BODY' ASTM AID 5 2" & SMALLER FORGINGS AN STANDARD STUD BOLTS WITH HEAVY I.

BOLTING:

ASTM A193,GR,87 HEXAGON NUTS.

j ASTM A194,GA.2H I}w w5 G ASK ET_S_:

"FLEXITALLIC" 2%" THRU 24" STYLE R-4, STYLE CG FOR 26" & LARGER a.

2" & SMALLER STYLE R-3

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." T, VALVES:

GATE GLOBE CHECK o5 080-GT D BO-G8 DSD-CK 3" & LARGER,900# BW:

gg CBD-GT CBD-GB CDD-CK gg CSO-GT C80-GB C80-CK f

2%",1500 # 8W:

o8 2" & SMALLER,1500# SW:

A JOINTS:

WELDED, EXCEPT AT FLANGED EQUIPMENT CONNECTIONS.

j ']5 FIELD WELD END PREPARATION AND WELD END TRANSITION, SHEET IV-4

.*I p

lT BR ANCH CONNECTIONS:

2%" & LARGER BRANCHES SHEET IV-6 3

2" & SMALLER BRANCHES: SHEET IV-7 jf*

El FIELD WELDING:

55 7T NON-DESTRUCTIVE EXAMINATION:

  • GROUP 9, SHEET IV-1 a

I

.)

b.".-

^

l ry

~,( g _ {. g A

Pl-f7 8)

Revised as noted 1l I

A 8d.7")

ISSUED FOR IISE l,1 MS

~~"/if l PIPE FNG.

'C H' K l aha Nk R CVt SIONS N o.

DATE MMNG CLASS SHEET l JOB No. 6478.

DOCUMENT

arv,,

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h PIPING DESIGN PACKAGE PORTLANO GENERAL ELECTRIC COMPANY E301 l p,;

tg( '

y TROJAN NUCLE AR PLANT II't 6 eta tran orsnw

i l CLASS :ESB PRIMARY RATING 600 A;isI CARBON STEEL

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CODE: ASME 8&PV CODE, SECTION til, CLASS 2 2;

ITEM MATERI AL SPECIFICATION SIZE l

REMARKS

!o PIPE:

AMSE SA-155, GR. KC70 26" & LARGER 3" AND SMALLER SCH.80

-i 4" + 6" SCH.40 Ej CLASS I. tSE AM WELDEDI

-24" & SMALLER g., THRU 14" SCH. 60 ASME SA-106, GR, B, (SEAMLESS) 16" THRU 24" SCH. 80

~

5 28" MIN. 0.858" 3 }5 5I

!. n' 5[g FITTINGS:

ASME SA-234. GR. WP6W 26" & LARGER SEAMWELD ED, BUTT WELDING, WALL (SA.515, GR 70 PLATE)

THICXNESS TO MATCH Pf PE.

g

-"g ASME SA-234, GR WPB 2%" THRU 24" SEAMLESS, BUTT WELOING WALL THICKNESS TO MATCH MPE.

g0 2" & SMALLER 30008 SOCKET WSLDING y.l.

ASME SA-105 I k FLANGES:

ASME SA-105, F&D, BORED 2%" THRU 24" 600 $ WELDING NECK. R.F.

~

5k TO MATCH PlPE 2" & SM ALLER 600 # SOCKET WELDING, R.F.

1'l i'

i 'I PLATE:

ASME SA-615, GR. 70 2i VALVE ASME SA-216. GR. WCS 2%" & LARGER CASTINGS

?g FORGINGS BODY!

ASME SA-105 2" & SMALLER AN STANDARD STUD EOLTS WITH BOLTING:

ASME SA-1es, GR, B7 fj&

HEAVY HEXAGON NUTS.

ASME SA-194, GR. 2H

.i U GASKETS:

"F LEXIT ALLIC" ALL STYLE CG g

O-w *E GATE GLOBE CHECK VALVES:

8'b o

E.E 2%" & LARGER,000s dW:

EB D-GT EBB-G8 EBB-CK hf 2" & SMALLER,0008 SW:

EBSGT EBSG5 EBBCK EE JOINTS:

WELDED, EXCEPT AT FLANGED EQUIPMENT CONNECTIONS.

)

FIELD WELD END PREPAR ATION AND WELD END TRANSITION SHEET IV-4 3

5I Ii BR ANCH CONNECTIONS:

2%" & LARGER BR ANCHES: SHEET IV-6 b

2" & SMALLER BR ANCHES: SHEET.IV-7 fj F.

Il FIELD WELDING:

53

!.1 iT NON-DESTRUCTIVE EXAMINATION:

GROUP 4. SHEET IV-1, NOTE 21

  • L
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I E [.

A lL

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64977 ISSUED FOR USE NPE ENG.

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DATE I

scs No.6478 P1P1NG C' *" SHEET DOCUMENT Iacv PORTLAND bPINC DESIGN PACKAGEENERAL ELECTRK, COMPANY 01 jn-o

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TROJAN NUCLE AR PLANT MQ T( A Ny

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a MAIN SIIAM LDES AND MAIN STEAM BRMG LEES NCUZ 1:

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P1Pt ENG.

i PEVICIONs NO.

D+ TE {

  • No.
6479, l

PIPING CLASS SHEET DOCUKENT j mEv.1 PIPING DESIGN PACKAGE j

ti-30 l r.V.;l S.p PONS _GCEPAL EIICTRIC C04PNW

,- -. 1 E

i

s. -(., ;j zAR.9:c.'

t l CL ASS : EE C PRIM ARY R ATING C00 ra g 7 CAR 8ON STEE L i

l CODE: POWER PIPING CODE, ANSI B31.1 ITEM l

M ATERI AL SPECIFICATION I.

SIZE I

REMARKS f ' ' & LARGER 2" AND SMALLER SCH-80 l

Eg, PtPE ASTM A155. GR. KC70, SCH40

_S CLASS 1, (SE AM WELD EDI I

2%"

]j SCH.80 ASTM A106. GR B 24" & SMALLER 3" SCH40 y

4" & 6" 6o (SEAMLESS)

SCH 60 8" THRU 18" jt 20" THRU 24" SCH.80 jj MIN

.858" 28" li FITTINGS:

ASTM A234. GR. WPBW.

26" & LARGER SEAM W ELDED, BUTT WELDI NG, W ALL

  • ((

THICKNESS TO MATCH PlFE.

(ASIS, GR. 70 PLATE)

.3 ASTM A234, GR.WPO OR WP6W 2h" THRU 24" SEAMLESS OR SEAM WELDED. BUTT WELDit<G, g;

WALL THICKNESS TO M ATCH P1PE.

Qh 2" & SMALLER 30008 SOCKET WELDING.

22 ASTM A105 l

.h N5[

FLANGES:

ASTM A105, F&D, BORED 2%" THRU 24" 600 # WELDING NECK. R.F.

c5 TO MATCH PIPE 2" & SMALLER 600 # SOCKET WELDING. R.F, I

% 2 1 '*E PLATE:

ASTM ASIS, GR. 70

535, p,

VALVE ASTM A216, GR. WCS 2%" & LARGER CASTINGS BODY:

ASTM A105 2" & SMALLER FORGINGS AN STANDARD STUD 00LTS WITH BOLTING; ASTM A103, GR. 67 HEAVY HEXAGON NOTS

,E =

ASTM A194, GR. 2H E

)R5 ALL STYLE CG

d GASKETS

"F LEXITALLIC"

=3 SE GATE GLOBE CHECK

" ' ~ ~

VALVES:

EBD-GT EBD-GB EBD-CK

_S o

2%" & LARGER,6000 BW:

  • e EDD-GT EBD-GB EBD-CK

{i 2" & SMALLER,6000 SW:

o3 WELDED, EXCEPT AT FLANGED EQUIPMENT CONNECTIONS 15 JOINTS:

53 FIELD WELD END PREPARATION AND WELD END TRANSITION SHEET IV-4 1

I

,8 lT BR ANCH CONNECTIONS:

7.7 & LARGER BR ANCHES: SHEET IV-6 2" & SMALLER BR ANCHES: SHEET IV-7

,, j Note 1: EBD-13 is non-critical C m'

" E.

FIELD WELOING:

v

[a 52

?T NON-DESTRUCTIVE EX AMINATION: GROUP 9, SHEET IV-1

  • 5 t

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l i f,

) /Jr.4

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A if:.T?..U Rovi::cd as noted i a MS J l */jj j i f)(Q A

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A/Pa.

AEv!SIONS

, d[

NO.

DATE l Joe No.6478 PIPING CLAS3 SHE ET DOC'J MEET jncv i

- d

.. PING DESIGN PACKACC PORTLAND GENERAL ELECTRIC COf*PANY 4 301 te" p'JC, TROJAN NOCLE AR PLANT s

- -. _ __.... _ _. _..J.9a u yP f m.9

.'__.U r.L L ___

CLASS : ggg PRIMARY R ATING eco A;is t IMPACT OU AllTY CARBON STEEL CODE: ASME B&PV CODE, SECTION 111, CLASS 2 CONTAINMENT PENETRATION ITEM f

MATERI AL SPECIFICATION I SIZE l

REMARKS ALL StztS 2" AND SMALLER SOH 80 fls PlPE:

ASME SA 333, GR. 6 (SE AM LESS)

SCH.40 i4 2%" THRU 6" SCH. 60

?$

8" THRU 14" f

6o 16" TH RU 24" SCH. 80 jj I

25

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Ii t-frae EI FITTINGS ASME SA-420, GR WPL6 2h"&lirger SEAM LESS,80TT WELDING. WALL THICKNESS

g.
  • TO MATCH PIPE j
l l

f 30004 socket welding a

's 8 2t& smaller jj j

EE FLANGES; ASME SA 3SO, G A, LF.2

' 2%" THRU 24" -

60CdWELDING NECK, RF 3

5, F&O BORED TO MATCH PIPE 2" & SM ALLER 600f SOCKET WELDING, RF

]j 2 ~e 33 PLATE:

ASME SA 516, GR. 60 a-}f VM ASME SA 352. GR. LCB

% "f.1 m r CASTINGS 2"& smaller ENGIN35 4t BODt.

ASME SA-105 AN STANDARD STUD BOLTS WITH BO W G.

ASME SA 320, GR. L43 HEAVY HEXAGON NUTS h]

ASME SA 194, GR,4 NUTS TO BE IMPACT TESTED TO SA 320 (NUTS)

.t y ALL STYLE CG

,gj GASKETS:

"F LEXITALLIC"

s d 'E GATE GLOBE CHECK "i

VALVES:

EB E-GT EBE GB EBE.CK Of 2%" & LARGER,600P BW EBE GT EBE G8 EBE CK

>h 2" & SMALLER,600 f SW o$

EE JOINTS:

WELDED EXCEPT AT FLANGED EQUIPMENT CONNECTIONS.

)

El FIELD WELD END PREPARATION AND WELD END TR ANSITION

SHEET IV-4

[

y BR ANCH CONNECTIONS:

2%" & LARGER BR ANCHES: SHEET IV-6 2" & SMALLER BRANCHES : SHEET IV-7 "3

.E Note 1: EBD-13 is rcn-critical.

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4" FIELD WELDING:

jT NON-DESTRUCTIVE EXAMINATION:

GROUP 4, SHEET IV-1. NOT': 21 E

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ASTM A358. GR. 304 10" & LARGER 12" & SMALLER SCH 4CS jj CLASS 1. ISEAM WELDED)

ASTM A312 OR ASTM A376.

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Date 4/5/85 ASD 1976 85M To R. C. Rupe From J. W. Carter Subject Failure of 14" Heater Drain Line We have examined the' failed 14" Heater Drain Line. The cause of failure was erosion-corrosion (flow-assisted corrosion) of an apparently normal SA106-GrB pipe due to excessive local flow velocity. It appears that the wall was re-duced to at least O'.040" in' thickness, which is in the vicinity of the cal-culated thickness at which a burst would be expected for a pressure of 400 psi.

The details of our examination are summarized below.

1.

Figures 1-4 show the failed region.

Figure 5 d^2ineates the progression of the fracture.

It initiated at the point marked 0, and proceeded as shown by the arrows.

Figures 6 and 7 are different views of the origin located near the weld.

Figures 8 and 9 reproduce the shallow scalloped surface topography i

typical of erosion-corrosion.

2.

Sections were taken from various regions for metallographic examination, hardness testing, and chemical analysis.

The metallographic sections were as follows:

Figure 10 - Transverse section through opposite side of pipe. OD a.

surface at top shows slight decarburization.

ASTM grain size is 7-8.

l b.

Figure 11 - Transverse section as in Figure 10 showing ID surface with scallop's visible at top of photomicrograph.

Figure 12 - Longitudinal section near that of Figures 10 and 11.

c.All figures exhibit a normal microstructure.

d.

Figure 13 - Locations of remaining metallographic sections.

Arrows indicate direction of viewing.

l l

Figure 14 - Transverse section incl.uding fracture surface, which e.is on left side.

ID is at bottom of photomicrograph.

Note plastic deformation (thinning) near break.

f.

Figure 15 - Transverse section from cut edge.

No evidence of thinning due to burst.

l 9

Figure 16 - Longitudinal section near weld.

Note decarburization on OD (left side) and fine recrystallized grain structure (ASTM No.10).

This region near the origin was probably somewhat stronger than base metal due to finer grain size.

L_ -

l

y 3.

The chemical analysis of the base material, hardness, and estimated mechanical properties are'shown in Attachment 1.

The material appears to meet the requirements for SA 106-Grade B.

Unlike the field installed steam generator."J" tubes this heat does not have high trace levels of Cr and Cu which enhance erosion-corrosion resistance.

4. summarizes the thickness measurements taken.

As noted in 2f', the measurements taken near the cut edge do not appear to have been affected by burst associated thinn'ing. We thus feel that 0.040" wall thickness is a reasonable number for calculational purposes.

5. indicates the expected wall thickness at* burst.

It should

' be pointed out that the properties of this material will vary depending on location and orientation.

The region near the weld would be'somewhat stronger in spots due to finer recrystallized grain size.

6.

The observed corrsion rates for the failed region and the 10"' expander are calculated in Attachment 4.

Using the mass flow rate you provided we have calculated the flow velocity in some of the piping sizes of interest

. Attachment 5). These flow velocities were then used to' estimate the total (metal loss in 40,000 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> based on German work under single phase flow conditions (Attachment 6). These figures were then adjusted downward to account for the slightly higher temperature and pH in the drain system re-lative to the test conditions.

The final values represent the estimated metal loss for plates oriented parallel to the flow.

This presumably would also be valid for flow in a smooth pipe.

Several things can affect the erosion-corrosion behavior predicted.

One is the presence of high trace-levels of Cr and Cu.

Since these elemelts are not routinely analyzed for in these steels, 'any particular pipe or fitting in the system can have an enhanced resistance over the reference steel. The-other variable of great importance is the presence.of perturbations in the flow which cause locally high fluid velocities.

No information is available for single phase flow, but in wet steam a relatively minor perturbation in a smooth pipe can increase the corrosion rate by a factor of five.

JWC:mjb Reviewed by R. J. Hess 175-cc: 3 P. Fischer L

i

(

HATERIAL PROPERTIES Analysis SA 106 Grade B Req.

C 0.24 w/o 0.30 max Mn 0.80 w/o 0.29-1.06 Si O.22 w/o 0.10 min S

0.018 w/o 0.058 max P

0.005 w/o 0.048 max Cu 0.021 w/o Ni 0.02 Cr 0.02 Mo 0.003 V

0.02 Al 0.025 Hardness:

Rb 75.2 UTS (estimated): 66 ksi 60 ksi spec min YS (estimated): 37 ksi 35 ksi spec min ASTM Grain Size 7-8 Base Material 4

10 WHAZ

-%samm___ _ _ _ _ _ - _ _ _ _ _ _.

0 THICKNESS MEASUREMENTS By Vernier Caliper,

Origin - Weld side 0.015" - 0.030" Origin - Pipe side 0.035" Cut Edge Figure 13 (nearFigure15 sample) 0.037" 0.040" Other side at cut for chemical analysis 0.100" - 0.130" By Metallography 0.023" Figure 16 0.022" 0.035" Figure 15 0.034" Figure 14 Away from crack 0.030" Figure 14 at crack 0.021" i

l l

f BURST PRESSURE From'Svensson's Theory MB3 P

=

r B3= F(B) =f(h) 66 ksi 37 ksi and Su for Sy

=

=

l 0.561 B

=

1.86 B

=

3 Pr t

=

Sy 8 3 (400)(7)

ORT Propertis l

=

(37X10)(1.86) 0.041"

=

(400)(7) 0300-400 F Properties t

=

(32X10)(1.86) 0.047"

=

e OBSERVE 0 EROSION CORROSION Failure Region t = ~40,000 hrs Wo =

0.375" Wf =

0.040"

0. 375 - 0.040 = 8. 38X10-6 in/hr.

~

Rate

=

40,000 3

X 10 mils X 8760 hrs, 73.4 mpy in year 10" Expander t = N40,000 hrs Wo =

0.375 Wf =

0.187-187 = 4.7X10~0 in/hr.'

0.37 Rate

=

3 X 10 mils X 8760 hrs 41.2 mpy

=

in-year i

I l

!~-

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j.

t FLOW VELOCITIES j

1 1

Q=

4,612,000 lbs/hr.

0367 F i

400 psi 3

4,612,000 lbs/hrX0.01819 f t /lb Q

=

4 8.3892X10 ft /hr

=

3 l

= 23.3 ft /sec 3

~

= 40,262 in /sec A

2 16"

=182.65 in A

2 14"

=137.89 in A

2 10" = 78.85 in 3

Y16" = 40,262 in /sec X 1 ft 18.4 fps

=

2 182.65 in 12 in 5.6 mps

=

3 24.33 fps V ) 4.. = 40,262 in /sec y 1 ft

=

137.89 in' "12 in 7.42 mps

=

3 42.'55 fps VI O.i 40,262 in /sec 1 ft

=

=

78.85 in#

12 in 12.97 mps

=

s Attachment 6-PREDICTED FROM GERMAN WORK I

Using Data at pH7 T 356 F for Steel St 37.2

=

1 V

2 23-60 pg/cm hr 16" 5.6 mps R

=

=

10.1 - 26.3 mpy

=

46-120 mils Metal Loss in 4.57 years

=

Y 2

30-77 pg/cm hr 7.42 mps R

2 14"

=

=

13.2 - 33.8 mpy

=

60.3-154.3 mils Metal Loss in 4.57 years

=

Y 2

3 10

= 12.97 mps R

63-163 eg/cm hr

=

27.7 - 71.6 mpy

=

Metal Loss in 4.57 years = 126.5 - 326.9 mils 0

Adjusting for T = 367 F, pH = 8.2 16" Loss = 26-68 mils 14" Los = 34-87 mils 10" Loss = 71-184 mils For Straight Runs - Flow perturbations can increase greatly

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