Ammonium Bisulfide Corrosion 2

[jamiegla1]

Hello,
Does anyone know the corrosion mechanism associated with ammonium bisulfide? Is this mostly a corrosion/erosion issue? Also, is Inconel 625 an acceptable alloy to protect against it?
Thanks in advance for any help.
Jamie

 

[EdStainless]

What concentration and temp? Also what impurities are you dealing with?

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[jamiegla1]

Temp is around 245F and conc is near 7557 ppm. NH3 in the water is 2520 ppm. I believe there is also NH4Cl. Not sure of any other impurities.

 

[TomEun]

It depends on many factors below;

1. Velocity
2. Amount and type of liquid HC
3. Temperature
4. NH3 & H2S (and HCl) partial pressure
5. NH4HS concentration
6. Wash water treatment/ Water quality
7. Dew point control
8. pH
9. Materials
10. Others

Normally the recommended materials may be upgraded according to the severity.

CS < (316 SS) < 2205 DSS < Alloy 825 < Alloy 625 < Titanium or Alloy C276

Please find the following references.

1. API RP 932-B, Design, Materials, Fabrication, Operation, and Inspection Guidelines for Corrosion Control in Hydroprocessing Reactor Effluent Air Cooler (REAC) Systems, 2004
2. API Technical Publication 938-C, Use of DSS in the Oil Refinery Industry, 2005
3. API RP 571 Damage Mechanisms Affecting Fixed Equipment in the Refining Industry, 2003
4. R.L. Piehl, Survey: Air Cooler Corrosion, Hydrocarbon Processing, p169-170, July 1975 and
Survey of Corrosion in Hydrocracker Effluent Air Coolers, Materials Performance, Vol 15 (1), January 1976, pp 15-20
5. E.F. Ehmke, Air Cooler Corrosion, Hydrocarbon Processing, p172-175, July 1975
6. B.N. Greene, Materials of Construction, p149-151, Chemical Engineering, Oct.1998
7. C.A. Shargay, et al., Corrosion in Hydroprocessing Units, NACE, 1996
8. A. Shingh, et al., Corrosion of Reactor Effluent Air Coolers, Corrosion Paper #97490, NACE, 1997
9. J. Turner, Design of Hydroprocessing Effluent Water Wash Systems, Corrosion Paper #98593, NACE, 1998
10. C.A. Shargay, et al., Ammonium Salt Corrosion in Hydrotreating Unit Stripper Column Overhead System, Corrosion Paper #99392, NACE, 1999
11. C.A. Shargay, et al., Design Considerations to Minimize Ammonium Chloride Corrosion in Hydrotreater Reactors, Corrosion Paper #01543, NACE, 2001
12. N. Sakai, et al., Hydrogen Absorption in Wet NH4HS Environment, Corrosion Paper #00681, NACE, 2000
13. H. Iwawaki, et al., Hydrogen Absorption in Non-Acidic H2S Environment, Corrosion Paper #96602, NACE, 1996
14. G.W. Wilks, et al., Unusual Aspects of Corrosion Failures in Refinery Hydrotreater Units, Corrosion Paper #00702, NACE, 2000
15. C.A. Shargay, et al., Cost Comparison of Materials Options for Hydroprocessing Effluent Equipment and Piping, Corrosion Paper #96600, NACE, 1996
16. P.R. Petersen, et al., Impact of Ammonia Chloride Salt Deposition of Refinery Operations., Corrosion Paper #01540, NACE, 2001
17. B.E. Hopkinson, et al., Material Upgrading History of An HDS Complex, Corrosion Paper #96599, NACE, 1996
18. J. Gutzeit, Effect of Organic Chloride Contamination of crude Oil on Refinery Corrosion, Corrosion Paper #00694, NACE, 2000
19. A. Bagdasarian, Crude Unit Corrosion and Corrosion Control, Corrosion Paper #96615, NACE, 1996
20. API STD 661, 2001
21. Materials Considerations/ Concerns and Corrosion Control, American Company Manual, 1998
22. Corrosion/2003 Minutes, NACE Task 205X, 2003
23. A.J. Bagdasarian, et al., Chloride SCC of ASS in Hydroprocessing Units, Corrosion Paper #97501, NACE, 1997
24. James Turrner, Design of Hydroprocessing Effluent Water Wash Systems, Corrosion Paper #98593, NACE, 1998
25. R.R. Williamson, Chloride Corrosion and Fouling in Naphtha Hydrotreating Units, UOP, AlChE Spring National Meeting, Orlando, Florida, Mar. 18-20, 1990
26. D.G. Damin and J. D. McCoy, Prevention of Corrosion in Hydrodesulfurizer Air Coolers and Condensers, Materials Performance, Vol 17 (12), December 1978, pp 23-26 (see also Corrosion Paper # 78131, NACE, 1978).
27. B.V. Johnson, H.J. Choi, and A.S. Green, Effects of Liquid Wall Shear Stress on CO2 Corrosion of X-52 C-Steel in Simulated Oilfield Production Environments", Corrosion Paper #91573, NACE, 1991
28. C. Scherrer, M. Durrieu, and G. Jarno, "Distillate and Resid Hydroprocessing: Coping with High Concentrations of Ammonium Bisulfide in the Process Water", Materials Performance, Vol 19 (11), November 1980, pp 25-31 (see also Corrosion Paper # 79027, NACE, 1979).
29.

http://www.corrosionsource.com/CS2000/session03/paper0301/paper0301.htm

Thomas Eun

 

[jamiegla1]

Thanks...im guessing those are also in order of increasing cost?

 

[EdStainless]

...and decreasing availability.

Actually all of those alloys are more or less available, depending on the porduct for that you need.

My personal comment would be to not look at 625. It costs nearly as much as a "C" type alloy and it does not have as good of corrosion resistance. I would look at the trade offs between 825 and a "C" alloy (C276, C22, 686, 59, this last one being easiest to weld).

= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection

http://www.trent-tube.com/contact/Tech_Assist.cfm

 

[jamiegla1]

Thank you all for your answers. Do any of you know the corrosion mechanism of NH4SH?