Weight Loss HPHT TCFC

7/30/2019 Weight Loss HPHT TCFC

http://slidepdf.com/reader/full/weight-loss-hpht-tcfc 1/69

10Bar-pH3-80C 19-Jul-11

Corrosion rate (K x W)!/(A x T x D)

Initial weight(g) Final weight (g) net average

w Mass loss in gram 38.3816 36.6934 1.6882 1.688267

38.3817 36.6934 1.6883

38.3817 36.6934 1.6883

K Constant 8.76E+04 3.45E+06 A Area in Cm2 7.9

T Duration in hrs 13

D Density in g/cm2 7.85

Corrosion rate 183.44 mm/yr



38.3817 36.7275 1.6542

38.3817 36.7273 1.6544

K Constant 8.76E+04 3.45E+06

A Area in Cm2 7.9




Average 181.6 mm/yr Ref ASTM G31 pg 7 ph

Diameter of the WL specimen 3.2 cm

3.18 cm (measured by calipher)

Surface area (cm2) 7.94202615



Weight with film= 36.7274 g

36.7275

36.7273

AVE 36.7274 Start immersion

8/19/2011 4:00 AM

w h l1.4 2.35 0.25 Finished

8/19/2011 4:45 PM

(the flow section leaked at 1 pm in which the w

Here 13 hours is taken since the WL specimen

still wet until it was removed at 4:45pm though

w h l

1.4 2.35 0.3

23.4181

mailto:+@sum(K2:K4)/3




ater was drained out)

was

some water might have drained out.



80Bar-pH3-80C 12-Aug-11




37.197 35.9053 1.2917

37.1972 35.9053 1.2919







37.197 35.9252 1.2718

37.1972 35.9252 1.272

K Constant 8.76E+04 3.45E+06

A Area in Cm2 7.9



Corrosion rate 105.69 mm/yr (Befor


Diameter of the WL specimen 3.2 cm3.18 cm (measured by calipher)





35.9252

35.9252


8/12/2011 5:15 PM


8/13/2011 9:00 AM

w h l

1.4 2.35 0.3

film removal) Iron count 43.87 mm/yr

23.4181





10Bar-pH3-25C 26-Jun-11




38.2995 38.2041 0.0954

38.2994 38.2041 0.0953







38.2995 38.2074 0.0921

38.2994 38.207 0.0924

K Constant 8.76E+04 3.45E+06

A Area in Cm2 7.9



Corrosion rate 4.49 mm/yr (before







38.2074

38.207


6/29/2011 9:21 AM


6/30/2011 2:30 PM

Iron count 16.43mm/yr

w h l

1.4 2.35 0.3

ilm removal)

23.4181





10Bar-pH3-50C 18-Jul-11




38.2348 37.299 0.9358

38.237 37.299 0.938




Corrosion rate 62.99 mm/yr Even befor

Could it be



38.2348 37.5498 0.685

38.237 37.55 0.687

K Constant 8.76E+04 3.45E+06

A Area in Cm2 7.9



Corrosion rate 46.12 mm/yr (before film rem







37.5498

37.55


7/19/2011 4:55 PM


7/20/2011 2:20 PM

removing with clarke solution, the CR with film would have been high (see below Table)

due the problem of the specimen not being flush-mounted (high local turbulence)?

w h l

1.4 2.35 0.3

val)

23.4181





10Bar-pH3-80C 12-Jul-11




38.6928 37.5213 1.1715

38.6924 37.5213 1.1711







6.6322 6.5003 0.1319

6.6322 6.5002 0.132

K Constant 8.76E+04 3.45E+06

A Area in Cm2 7.9










37.5498

37.55


7/14/2011 6:15 PM


7/15/2011 9:20 AM

Experiment was invalid due to mis-installation of specimen (the final WL was for 80b-25 C; noted

down on a wrong page; no WL for 10b-80C was measured yet)

w h l

1.4 2.35 0.3

23.4181





80Bar-pH3-25C 20-Jun-11




38.6432 37.5213 1.1219

38.642 37.5213 1.1207


T Duration in hrs 24.5





38.6432 38.5562 0.087

38.642 38.5563 0.0857

K Constant 8.76E+04 3.45E+06

A Area in Cm2 7.9

T Duration in hrs 24.5


Corrosion rate 5.02 mm/yr (Befor







38.5562

38.5563


6/22/2011 3:00 PM


6/23/2011 3:35 PM

w h l

1.4 2.35 0.3

film removal) Iron count 13.29 mm/yr

23.4181





\\vboxsrv\conversion_tmp\scratch_6\167171753.xlsx.ms_office

L P R

W E I G H T L O S S

I R O N C O U N T

0

5

10

15

20

25

30

35

500 RPM

C o r r o s i o n R a t e s ( m m p e r y e a r )

Rotation Rates (RPM)

This plot is based on new LPR and iron count data obtained on Sept 14, 2010



L P R

W E I G H T L O S S

I R O N C O U N T

0

5

10

15

20

25

30

35

500 RPM





1 0 b a r

1 0 b a r

1 0 b a r

1 0 b a r

7 0 b a r

7 0 b a r

7 0 b a r

7 0 b a r

0

5

10

15

20

25

30

35

0 RPM 100 RPM 500 RPM 1000 RPM





p H 3

p H 3

p H 3

p H 3

p H 4 . 1

8

p H 4 . 1

8

p H 4 . 1

8

p H 4 . 1

8

0

5

10

15

20

25

30

35






2 5 D e g C

2 5 D e g C

2 5 D e g C

2 5 D e g C 5 0

D e g

C 5 0 D e g

C

5 0 D e g

C

5 0 D e g

C

0

5

10

15

20

25

30

35






L P R

W E I G H T L O S S

I R O N C O U N T

I C M T

D A T A B A S E *

0

5

10

15

20

25

30

35

40

500 RPM

C o r r o s i o n R a t e s ( m m / y e a r )

Rotation Rates (RPM) *at V=1m/s, pH=5 and T=60 oC



L P R

W E I G H T L O S S

I R O N C O

U N T

0

5

10

15

20

25

30

35

40

500 RPM

C o r r o s i o n R a t e ( m m p e r y e a r )




L P R

W E I G H T L O

S S

I R O N C O U N T F

r e e C o r p

D A T A B A S E *

0

5

10

15

20

25

30

35

40

45

500 RPM



Comparison of Corrosion Rates from Various Methods; pCO2=70bar;

T=25o C, pH=3

*1-L autoclave; stagnant condition, natural pH (3.07), 25 o C, and pCO2=80bar



1 0 b a r

1 0 b a r

1 0 b a r

1 0 b a r

F r e e C o r p - 1 0 b a r



F r e e C o r p - 1 0 b

a r

7 0 b a r

7 0 b a r

7 0 b a r

7 0 b a r

F

r e e C o r p - 7 0 b a r




0

5

10

15

20

25

30

35

40

45




Corrosion Rates of X-65 Carbon Steel at Various pCO2 and T=25o C

pH= 3.0



1 0 b

a r

1 0 b a r

1 0 b a r

1 0 b a r

7 0 b a r

7 0 b a r

7 0 b a r

7 0 b a r

0

2

4

6

8

10

12

14




Corrosion Rates of X-65 Carbon Steel at Various pCO2 and T=25o C

pH= 3.0



p H 3

p H 3 p

H 3

p H 3

p H 4 . 1 8

p H 4 . 1 8

p H 4 . 1 8

p H 4 . 1 8

0

2

4

6

8

10

12

14

16

18

20


C

o r r o s i o n R a t e s ( m m p e r y e a r )


Corrosion Rates of X-65 Carbon Steel at Various pH's and at T=25o C and

pCO2=10bar



p H 3

p H 3

p H 3

p H 3

F r e e C o r p - p H 3

F r e e C o

r p - p H 3



p H 4 . 1 8

p H 4 . 1 8

p H 4 . 1 8

p H 4 . 1 8

F r e e C o r p - p H 4 . 1 8

F r e e C o r p - p H 4 . 1

8

F r e e C o r p - p H 4 . 1

8

F r e e C o r p - p H 4 . 1 8

0

2

4

6

8

10

12

14

16

18


C




pCO2=10bar



p H 3

p H 3 p

H 3

p H 3

p H 4 . 1 8

p H 4 . 1 8

p H 4 . 1 8

p H 4 . 1 8

0

5

10

15

20

25

30

35





pCO2=10bar



2 5 D e g C

2 5 D e g C

2 5 D e g C

2 5 D e g C

5 0 D

e g C

5 0 D e g C

5 0 D e g C

5 0 D e g C

0

5

10

15

20

25

30

35


C



Corrosion Rates of X-65 Carbon Steel at Various Temperatures and at

pH= 4.18 and pCO2=10bar



2 5 D e g C

2 5 D e g C

2 5 D e g C

2 5 D e g C

F r e e C o r p - 2 5 D e g C




5 0 D

e g C

5 0 D e g C

5 0 D e g C

5 0 D e g C


F r e e C o r p -

5 0 D e g C

F r e e C o r p

- 5 0 D e g C

F r e e C o r p

- 5 0 D e g C

0

5

10

15

20

25

30

35


C



Corrosion Rates of X-65 Carbon Steel at Various Temperatures and at

pH= 4.18 and pCO2=10bar



0

5

10

15

20

25

30

35

0 100 200 300 400 500 600 700 800 900 1000

C



Corrosion Rates of X-65 Carbon Steels at Various pH and Temperatures;

pCO2=10bar

pH 3-25C

pH3-25C-FC

pH4-25C

pH4-25C-FC

pH4-50C

pH4-50C-FC

FreeCorp-pH4-50oC

pH4-50o C

FreeCorp-pH3-25o C

FreeCorp pH4-25C

pH3-25o C

pH4-25C



Pressure=10 bar Temp=25 C pH=3.14 (adjusted) 80 bar

start "May 13,2010




21.5023 20.9361 0.5662

21.5019 20.9361 0.5658K Constant 8.76E+04 3.45E+06

A Area in Cm2 15.95





w Mass loss in gram 22.2742 22.2742 22.27377

22.2737 22.2737

22.2734 22.2734

K Constant 8.76E+04 3.45E+06

A Area in Cm2 15.95




Average 286.5 mm/yr Ref ASTM G31 pg 7

To calculate the ferrous ion concentrations (Basic idea: weight loss corresponds to th

Molar mass 55.845 g/mole 55.845 g/mole

Volume of solution 0.7 L

A Mole of Fe2+

= Weight loss/molar mass of Iron

0.010136389 mole

0.7 L

[Fe2+

]= 0.014480556 Molar

808.6666667 ppm

B Mole of Fe2+


0.027543817 mole

[Fe2+

]= 0.03934831 Molar



31819.66667 ppm

AVE 16314.16667 ppm

Dilution Factor for spectrophometer (iron concentration) Objective: to counterc

to give us aM1 32628.33333 ppm Total ferrous ions in the 700 mL solution f

V1 0.091944629 ml

M2 3 ppm

V2 1000 ml

Take V1 mL of the collected test solution and put it into IL beaker and top it up with deionized water to IL.

Then transfer 10 mL of the diluted solution into sample jars.

Measured ferrous ions 1068 ppm



Pressure=1Temp=25 C pH=3 (adjusted)

start May 6 @2:15 Feb20@3pm

Corrosion (K x W)!/(A x T x D)

Initial weight(g)

w Mass loss in 22.1778

22.1778

22.1781K Constant 8.76E+04

A Area in Cm2 15.95

T Duration in h 24

D Density in g/ 7.85

Corrosion rate

w h l

2.5 1.24 0.64

FreeCorp=7.7 mm/yr

dissolution of ferrous ions)

mailto:Feb20@3pm

mailto:Feb20@3pm



eck whether the calculated ferrous concentration is correct and

n idea how much dilution is required (since the equipment could only read up to 3 ppm.om both specimens

. 1068



Final weight (g) net average

22.1778 22.1779

22.1778

22.17813.45E+06

mm/yr



Pressure=10 bar Temp=25 C pH=3.09 (adjusted)

start "May 10,2010




22.1304 21.6424 0.488

22.1295 21.6424 0.4871K Constant 8.76E+04 3.45E+06

A Area in Cm2 15.95





w Mass loss in gram 22.2742 22.2742 22.27377

22.2737 22.2737

22.2734 22.2734

K Constant 8.76E+04 3.45E+06

A Area in Cm2 15.95








A Mole of Fe2+


0.008731907 mole

0.7 L

[Fe2+

]= 0.012474153 Molar

696.6190476 ppm

B Mole of Fe2+


0.031974099 mole

[Fe2+

]= 0.045677285 Molar



31819.66667 ppm

AVE 16258.14286 ppm


to give us aM1 32516.28571 ppm Total ferrous ions in the 700 mL solution f

V1 0.09226146 ml

M2 3 ppm

V2 1000 ml

Take V1 mL of the collected test solution and put it into IL beaker and top it up with deionized water to IL.





Pressure=1Temp=25 pH=3 (adjusted)

start May 6 @2: Feb20@3pm


Initial weight(g)

w Mass loss 22.1778

22.1778

22.1781K Constant 8.76E+04

A Area in C 15.95

T Duration i 24

D Density in 7.85

Corrosion rate

w h l

2.5 1.24 0.64

FreeCorp=7.7 mm/yr


mailto:Feb20@3pm

mailto:Feb20@3pm

mailto:Feb20@3pm





. 1068




22.1778 22.1779

22.1778

22.17813.45E+06

mm/yr



L P R

W E I G H T L O S S

I R O N C O U N T

F

r e e C o r p

0

2

4

6

8

10

12

14

16

18

20

500 RPM

C o r r o s i o n R a t e s ( m m p e r y e a

r )


Comparison of Corrosion Rates from Various Methods at pCO2=10bar, pH=3

and T=25 oC



L P R

W E I G H T L O S S

I R O N C O U N T

F r e e C o r p

D A T A B A S E *

0

5

10

15

20

25

30

35

500 RPM

C o

r r o s i o n R a t e s ( m m p e r y e a r )


Comparison of Corrosion Rates from Various

Methods;pCO2=10bar;pH=4.18, T=50 oC

*at V=1m/s, pH=5 and T=60 oC (K George)



L P R

W E I G H T L O

S S

I R O N C O U N T F

r e e C o r p

D A T A B A S E *

0

5

10

15

20

25

30

35

40

45

500 RPM

C o r r o

s i o n R a t e s ( m m p e r y e a r )


Comparison of Corrosion Rates from Various Methods; pCO2=70bar;

T=25o C, pH=3

*1-L autoclave; stagnant condition, natural pH (3.07), 25 o C, and pCO2=80bar



L P R

W E I G H T L

O S S

I R O N C O U N T

D A T A B A S E *

0

5

10

15

20

25

30

35

40

0 RPM 500 RPM

C o r r o s i o n R a t e ( m m p e r y e a

r )


*1-L autoclave: pCO2=80bar; 25 o C, natural pH (3.07), and stagnant condition



L P R

W E I G H T L O S

S

I R O N C

O U N T

0

5

10

15

20

25

30

35

40

500 RPM

C o r r o s i o n R a t e ( m m p e r y e a

r )

Rotation Rate (RPM)



Corrosion Rates

50C

0 100 500 1000 0 100

LPR 3.9 4.1 4.9 5.4 3.8

WL 1.7

FreeCorp 7 10.5 14.6 16.6

pCO2=10bar

0 RPM 100 RPM 500 RPM 1000 RPM 0

LPR 7.58523048 7.981975688 9.624445 10.3431 5.886674

7.65618076 7.798760135 9.234532 10.46938 5.808818

MEAN 7.62070562 7.890367911 9.429489 10.40624 5.847746STD DEV 0.05016943 0.12955296 0.27571 0.089295 0.055053

STD ERROR 0.03547514 0.091607776 0.194957 0.063141 0.038928

WL 19

Iron Count 17.43

FreeCorp 7 10.5 14.6 16.6 7

Wang

at 500RPM (pH 3-25 C) at 500RPM (pH 4-25 C)

LPR WL Iron Count FreeCorp LPR WL Iron Count

9.429489 19 17.43 14.6 8.186314 13 19

at 500RPM (pH 3-25 C)

LPR WL Iron Count FreeCorp

0 0 0 at 500RPM (pH 4-25 C)

pH3

25C

pH3

25C

pH3



LPR 0 RPM 100 RPM 500 RPM 1000 RPM 0

MEAN

STD DEV

STD ERROR

WL 14.22

Iron Count 8

FreeCorp 27.6

Wang

pCO2=70bar

0 RPM 100 RPM 500 RPM 1000 RPM 0

LPR 11.0882618 12.89923865 8.665706 10.13356

10.7378278 9.733695757 11.38264 8.994674

MEAN 10.9130448 11.3164672 10.02417 9.564117

STD DEV 0.24779428 2.238376843 1.921163 0.805314

STD ERROR 0.17521702 1.582771445 1.358467 0.569443

WL 16.5

Iron Count 14

FreeCorp 35.4 37.5 39.7 40.7

Wang 4

0 RPM 500 RPM

LPR 0 10.02417323

WEIGHT LOSS 0 16.5

IRON COUNT 0 14

DATABASE 4 0

pH3

25C

25C



500 1000 0 100 500 1000

4.4 4.5 3.6 5.1 5.6 6

13 33

7.5 19.8

100 500 1000 0 100 500 1000

7.337953 8.624204 8.754175 19.83187 30.26443 27.91835 30.21365

6.605773 7.748424 8.669878 20.16499 24.46649 28.22467 30.52091

6.971863 8.186314 8.712026 19.99843 27.36546 28.07151 30.367280.51773 0.61927 0.059607 0.235553 4.099764 0.216597 0.217264

0.36609 0.43789 0.042148 0.166561 2.898971 0.153157 0.153629

13 33

19 29

7.3 7.5 7.7 19 19.3 19.8 20

25.5

at 500RPM (pH 4-50 C)

FreeCorp LPR WL Iron Count FreeCorp Database (Keith George * Shih Wang)

7.5 28.07151 33 29 19.3 25.5

25 33 28

pCO2=40bar

pH4

25C 50C

50C

pH4



100 500 1000 0 100 500 1000

100 500 1000 0 100 500 1000

pH4

25C 50C

25C 50C



Pressure=10 bar Temp=25 C pH=3 (adjusted)

start March 19@3:35 pm Feb20@3pm




22.3908 22.34245 0.04835

22.3909 22.3245 0.0664K Constant 8.76E+04 3.45E+06

A Area in Cm2 15.95



Corrosion rate 1.76 mm/yr pCO2=10 bar; pH=4; T=25 C



22.2737 21.7468 0.5269

22.2734 21.7468 0.5266

K Constant 8.76E+04 3.45E+06

A Area in Cm2 15.95








A Mole of Fe2+


0.001080073 mole

0.7 L

[Fe2+

]= 0.001542961 Molar

86.16666667 ppm

B Mole of Fe2+


0.006115667 mole

[Fe2+

]= 0.008736668 Molar

mailto:Feb20@3pm

mailto:Feb20@3pm



752.8095238 ppm

AVE 419.4880952 ppm


to give usM1 838.9761905 ppm Total ferrous ions in the 700 mL solution f

V1 3.575786815 ml

M2 3 ppm

V2 1000 ml

Take V1 mL of the collected test solution and put it into IL beaker and top it up with deionized water to





Pressure=1Temp=25 pH=3 (adjusted)

start May 6 @2: Feb20@3pm


Initial weight(g)

w Mass loss 22.1778

22.1778

22.1781K Constant 8.76E+04

A Area in C 15.95

T Duration i 24

D Density in 7.85

Corrosion 19.39

w h l

2.5 1.24 0.64

FreeCorp=7.7 mm/yr


mailto:Feb20@3pm

mailto:Feb20@3pm

mailto:Feb20@3pm





IL. 1068




21.5126 0.6652 0.6653

21.5126 0.6652

21.5126 0.66553.45E+06

mm/yr



1-May-10 Finished on 5/2/2010 10 bar-pH4-50C




22.3365 21.009 1.3275

22.3362 21.009 1.3272







15.5194 7.8013 7.7181

15.519 7.8012 7.7178

K Constant 8.76E+04 3.45E+06

A Area in Cm2 10.44




Average 188.4Ref ASTM G31 pg 7 ph

To calculate the ferrous ion concentrations (Basic idea: weight loss corresponds to



A Mole of Fe2+


0.023768168 mole

0.7 L

[Fe2+

]= 0.033954525 Molar

1896.190476 ppm

B Mole of Fe2+


0.004070196 mole

[Fe2+

]= 0.005814566 Molar

11025.52381 ppm



AVE 6460.857143 ppm

Dilution Factor for spectrophometer (iron concentration)

M1 1896.190476 ppmV1 1.582119538 ml

M2 3 ppm

V2 1000 ml

Take V1 mL of the collected test solution and put it into IL beaker and top it up with deionized water t




w h l1.25 2.5 0.6

w h l

1.2 2.5 0.6

he dissolution of ferrous ions)



IL.



10Bar-pH5-50C July 28 2010




23.9296 23.4181 0.5115

23.9298 23.4181 0.5117







6.6322 6.5003 0.1319

6.6322 6.5002 0.132

K Constant 8.76E+04 3.45E+06

A Area in Cm2 8.83








w h l1.4 2.35 0.25

w h l

1.4 2.35 0.3

23.4181



8-Feb-09




5.9835 5.8552 0.1283

5.9832 5.8552 0.128







6.6322 6.5003 0.1319

6.6322 6.5002 0.132

K Constant 8.76E+04 3.45E+06

A Area in Cm2 8.83







w h l1.4 2.35 0.25

w h l

1.4 2.35 0.3



0 RPM

100 RPM

500 RPM

1000 RPM

0

100

500

1000

0

1

2

3

4

5

6

25C

0 RP

100 R

500 R

1000

0

100

500

1000



0

2

4

6

8

10

12

14

16

18

20



Rotation Rates

Corrosion Rates of X-65 Carbon Steel at Various Velocities and pH for

pCO2=10 bar and Temp at 25oC

LPR-PH3

FreeCorp-pH3

LPR-pH4

FreeCorp-pH4

Weight Loss-pH3

Weight Loss-pH4



0

5

10

15

20

25

30

35


C o r r

o s i o n R a t e s ( m m p e r y e a r )

Rotation Rates

Corrosion Rates of X-65 Carbon Steel at Various Velocities and

Temperatures for pCO2=10 bar and pH 4

LPR-25 C

FreeCorp-25C

LPR-50 C

FreeCorp-50C

Weight Loss-25C

Weight Loss-50C



0

5

10

15

20

25

0 100 200 300 400 500 600 700 800 900 1000

C



Corrosion Rates of X-65 Carbon Steels at Various pH and Temperatures;

pCO2=10bar

pH 3-25C

pH3-25C-FC

pH4-25C

pH4-25C-FC

pH4-50C

pH4-50C-FC

FreeCorp-pH4-50oC

pH4-50o C

FreeCorp-pH3-25o C

FreeCorp pH4-25C

pH3-25o C

pH4-25C



Corrosion Rates

50C

0 100 500 1000 0 100 500

LPR 3.9 4.1 4.9 5.4 3.8 4.4

WL 1.7 13

FreeCorp 7 10.5 14.6 16.6 7.5

0 RPM 100 RPM 500 RPM 1000 RPM 0 100

LPR 3.9 4.1 5 5.4 3 3.8

3.9 4 4.8 5.3 3 3.4

WL 19

FreeCorp 7 10.5 14.6 16.6 7 7.3

25C

pH3

pH3

25C 2

8

10

12

14

16

18



0

2

4

6

0 RPM 100 R



1000 0 100 500 1000

4.5 3.6 5.1 5.6 6

33

19.8

500 1000 0 100 500 1000

4.4 4.5 11 13 15 17

4 4.5 11 16 16 17

13 33

7.5 7.7 19 19.3 19.8 20

50C

pH4

C 50C

pH3

pH4



M 500 RPM 1000 RPM

ree orp

Documents

Weight Loss HPHT TCFC