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U-250 (EOA 2150) Unit Specification FluidFeed Ethylene Oxide
Carbon Dioxide
Actaldehyde
Anhydrous Ammonia
Chlorine
Carbon Dioxide
Product Monoethanolamine (MEA)
Diethanolamine (DEA)
Triethanolamine 99% (TEA 99)
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Material Water Conc. (%) TmaxR (F) Rating (mpy) Reference SourceCS 100 125 < 2 NACE 2002
304/304L 100 225 < 2 NACE 2002
316/316L 100 325 < 2 NACE 2002
CS10
100
50
500
> 50
< 2NACE 85
304/304L
10
100
200
450 < 2 NACE 85
316/316L10
100
200
450< 2 NACE 85
CS10
100
50
150
20-50
< 2NACE 85
304/304L 0-100 100 < 2 NACE 85
316/316L 0-100 200 < 2 NACE 85
CS 100 500 < 2 NACE 85
304/304L 100 500 < 2 NACE 85
316/316L 100 500 < 2 NACE 85
CS
70-90
70-90100
100
100
200
400200
250
400
> 50
< 20< 2
20-50
> 50
NACE 85
304/304L80-90
100
50
200
> 50
< 2NACE 85
316/316L80-90
100
50
200
> 50
< 2NACE 85
CS10
100
50
500
> 50
< 2NACE 85
304/304L10
100
200
450< 2 NACE 85
316/316L10
100
200
450< 2 NACE 85
API RP 581:2008
API RP 945:2003-2004
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Notes
Pitting
Pitting; SCC
Pitting; SCC
Pitting
SCC. Carbon dioxide and aldehydes impurities.
SCC. Carbon dioxide and chloride impurities.
Information on "Amines" sheet
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U-255 (EOD 2150) Unit Specification Fluid MaterialFeed Monoethanolamine*
Anhydrous Ammonia CS
304/304L
316/316L
Product Ethylenediamine (EDA) CS
304/304L
316/316L
Diethylenetriamina (DETA) CS
304/304L
316/316L
Piperazine 68%
(AQ PIP-68)
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Water Conc. (%) TmaxR (F) Rating (mpy) Reference Source
100 500 < 2 NACE 85
100 500 < 2 NACE 85
100 500 < 2 NACE 85
100
100
100
200
< 2
< 20NACE 85
100 200 < 2 NACE 85
100 200 < 2 NACE 85
100 100 < 2 NACE 85
100 200 < 2 NACE 85
100 200 < 2 NACE 85
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Notes
SCC. Carbon dioxide
and chloride
impurities.
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U-265 (EOD 2150) Unit SpecificationFeed
Product
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Fluid Material Water Conc. (%)Ethylene Oxide CS 100
304/304L 100
316/316L 100
Carbon Dioxide CS10
100
304/304L
10
100
316/316L10
100
Actaldehyde CS10
100
304/304L 0-100
316/316L 0-100
N-butanol,glycol ether
Butanol CS 100
304/304L 100
316/316L 100
Isobutanol
Butyl Ether
2-Ethylhexanol
2&3-MethylButanol
Butoxy Glycol Ether, EB
Carbonyls
2-Ethyl 2-hexanal
Butoxy Diglycol Ether, DB
Butoxy Triglycol Ether, BTG
Butoxy Polyglycol Eher, BPG
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TmaxR (F) Rating (mpy) Reference Source125 < 2 NACE 2002
225 < 2 NACE 2002
325 < 2 NACE 2002
50
500
> 50
< 2NACE 85
200
450 < 2 NACE 85
200
450< 2 NACE 85
50
150
20-50
< 2NACE 85
100 < 2 NACE 85
200 < 2 NACE 85
200 < 2 NACE 85
200 < 2 NACE 85
200 < 2 NACE 85
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Notes
Pitting
SCC. Carbon dioxide and aldehydes im
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CORROSION RATE
Amine Gas Loading (mol/mol) HSAS (wt%) Concentration (wt%)
MEA
DEA
TEA 99
EOA Heavies (TEA)
1. Concentration of amine solution and "Heat Stable Amine Salts" (HSAS)
AMINE
MEA
DEA
MDEA*above them corrosion rate increases * reduce amines content to absorb gas
2. Acid gas content of the solution ("loading")system
H2S only
H2S + CO2 sistem
MDEA & H2S only* At T => corriosion rate
3. Velocity or turbulence
amine loading velocity limits (ft/s) gas loading
rich amine 5 > 0,1
lean amine 20 < 0,1
> 40 - 50 wt% > 500 ppmw (organic aci
amine loadings
rich - 0,7 mole/mole
rich - 0,35 - 0,45 mole/mole
rich - below those levels
AMINE CONCENTRATION HSAS CONC
> 20 wt%> 2
> 30 wt%
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Velocities (ft/s) Temperature (F) Material Corrosion Rate (mpy)
. Can be corrosive
contaminants [formate,
ENTRATION
t%
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Gas Loading HSAS 20 > 20 20
2 1 3 1
3 2 6 2
4 5 10 5
5 > 5 5
2 1 3 23 2 6 4
4 5 15 8
2 2 6 3
3 4 10 6
4 8 25 15
2 2 6 4
3 4 10 8
4 8 25 15
2 3 9 5
3 6 15 10
4 10 30 20
2 3 9 7
3 6 20 15
4 10 30 30
2 4 10 9
3 8 15 20
4 15 35 40
2 5 15 10
3 10 30 20
4 20 45 40
190 2
0.25
< 0,1
0.15
0.35
0.45
0.55
0.65
0.7
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Temperature
Velocity
> 20 20 > 20 20 > 20 20 > 20 20 > 20
3 3 10 5 15 10 25 15 40
6 6 20 15 40 20 45 30 80
15 15 40 30 60 40 90 60 120
Velocity
> 5 5 > 5 5 > 5 5 > 5 5 > 5
6 5 15 10 30 15 45 20 6012 10 30 20 60 30 90 40 80
25 20 60 40 80 60 120 120 150
9 7 20 10 30 20 60 25 75
20 15 40 20 50 40 80 50 100
45 30 60 40 80 80 120 100 150
10 7 20 15 40 25 70 30 80
25 15 45 30 60 50 100 100 150
40 35 70 60 100 100 140 150 180
15 10 30 15 45 35 70 45 100
30 20 60 45 90 70 130 90 150
40 40 80 90 120 120 150 150 180
20 10 30 25 75 40 100 50 120
45 20 60 50 100 80 140 100 150
60 45 90 100 150 140 180 160 200
30 15 40 30 100 50 120 60 150
40 30 60 60 100 90 140 100 150
80 60 100 100 150 140 180 160 200
30 20 60 40 100 60 120 70 150
60 40 80 70 120 100 150 120 150
80 60 100 100 150 150 180 170 220
0 220 240 260 270
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Amine Concentration (wt%) Multiplier
20 1
21-25 1.5
> 25 2
30 1
31-40 1.2
> 40 1.5
TEA
mm/y mpy
0.1 0.03 1
0.15 0.03 1
0.25 0.03 1
0.35 0.05 2
0.45 0.05 2
0.55 0.08 3
0.65 0.1 4
Temperature 300 F
MEA
DEA
Acid Gas Loading
(mol/mol)
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0.7 0.13 5
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API RP 945 AMINAS
MEA, DEA - remove H2S
AMINE CRACKING MDEA - H2S
MEA > DEA, DIPA, MDEA
Cracking susceptibility generally decreases in the order of primary amine, secondary and terti
PWHT (carbon steel)593 C - 649 C (1100 F - 1200 F) (1h cada 25 mm)
MEA - regardless of service temperature
DEA - service temperature 60 C (140 F) (studies X temperatures below 60 C; PWHT could
DIPA - regardless of service temperature (Cracking reported for no PWHT CS, 15-20 percent
MDEA - service temperature 82 C (180 F) NOT VERY COMMON
OTHER UNITS - susceptibility to cracking , especially for service T C
API RP 581
AMINE CRACKING
Parameters to assess the susceptibility to amine cracking
1. Stress relieved (YES/NO)
(PWHT for preventing. 1150 F, 1h per 25 mm (1 inch))
2. Type of amine: MEA, DIPA > DEA > MDEA, sulfinol, DGA
MEA: susceptibility --> 15 - 35 % concentration range
3. Amine soution composition:
Lean amine solution H2S or CO2 --> amine cracking typically occurs
Rich amine solution H2S or CO2 --> amine cracking not likely to occur, SSC, HIC, S
Fresh amine solution no H2S or CO2 --> amine cracking not occur* For equipment exposed to both lean and rich amine solutions, indicate lean
4. Metal temperature
T --> damage
5. Heat traced (YES/NO)
6. Steamed out (YES/NO)
AMINE CORROSION MEA, DEA > MDEA
Parameters that affect
1. Concentration of amine solution and "Heat Stable Amine Salts" (HSAS)
AMINE
MEA
DEA
MDEA*above them corrosion rate increases * reduce amines content to absorb ga
2. Acid gas content of the solution ("loading")
AMINE CONCENTRATION HSAS CON
> 20 wt%>
> 30 wt%
> 40 - 50 wt% > 500 ppmw (organic ac
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system
H2S only
H2S + CO2 sistem
MDEA & H2S only* At T => corriosion rate * Acid gas loading: reported in terms of moles of acid gas per mole of active amine:
Rich solution - amine of higher acid gas loading 0,1 mole/mole
Lean solution - lower acid gas loading (< 0,1 mole/mole)
3. Velocity or turbulence
amine loading velocity limits (ft/s)
rich amine 5
lean amine 20
TABLE G-47 TO DETERMINE CORROSION RATE OF CS
amine loadings
rich - 0,7 mole/mole
rich - 0,35 - 0,45 mole/mole
rich - below those levels
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nd CO2
iary.
be necesary)
IPA solutions)
HIC DETERMINATION OF SUSCEPTIBILITY
TO AMINE CRACING
- FIGURE H-4 -(API RP 581, pag H-13)
s. Can be corrosive
CENTRATION
wt%
id contaminants [formate,
