Super Deuplex or Inconel Grade
Super Deuplex or Inconel Grade
(OP)
I have been asked by someone in my company to look into what grade of either super duplex or inconel they will need for pipe for pumping 10%HCL at 90 degrees centigrade.
Any advice as I have not had experience of either of these before?
Greatly appreciated.
Mechmos
Any advice as I have not had experience of either of these before?
Greatly appreciated.
Mechmos





RE: Super Deuplex or Inconel Grade
"When the eagles are silent, the parrots begin to jabber."
Winston Churchill
RE: Super Deuplex or Inconel Grade
IF you do have oxidizing ions present then I am not sure what options you have. I don't believe that a "C" type alloy can handle this temp.
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RE: Super Deuplex or Inconel Grade
Comeback with a little more information about your process especially the acid purity.
You might have to go to something like this.
http://www.resistoflex.com/thermalok_process.htm
RE: Super Deuplex or Inconel Grade
This temp is nothing to take lightly.
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Rust never sleeps
Neither should your protection
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RE: Super Deuplex or Inconel Grade
RE: Super Deuplex or Inconel Grade
http://www.smithfibercast.com/main.htm
This is right at the temp limit, but even using heavy gage composite pipe with continous support it will be a lot less money than alloy.
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Rust never sleeps
Neither should your protection
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RE: Super Deuplex or Inconel Grade
Use lined pipe, unless pressures are very low, in which case FRP is a good choice as mentioned, especially at linesizes 3" and above. PVDF- or PTFE-lined will be fine down to the smallest linesize available (1"). You get the disadvantage of more potential leakage points since every tee, elbow etc. is flanged, but you also get the benefit of more mechanical robustness and greater pressure/temperature handling relative to FRP pipe.
RE: Super Deuplex or Inconel Grade
If you go with FRP in this service make sure that you validate the joining method. If you are glueing you must test glued joints in hot acid to make sure that they will hold up.
= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: Super Deuplex or Inconel Grade
1. ht
2. API TR938C-2005 Use of DSS in the Oil Refining Industry
RE: Super Deuplex or Inconel Grade
Glass lined carbon steels have been used in similar applications for vessels but I don't know any glass lined steel pipe manufacturers for pipe.
I used polyvinylidene flouride lined Alloy 625 pipe and vessels (US GOV Project)in a similar application many years ago. Lesser alloys were not considered due to Ed's commentary regarding catastrophic failure. Design Life of the equipment was only 2 years. The equipment did survive its design life.
RE: Super Deuplex or Inconel Grade
RE: Super Deuplex or Inconel Grade
If the system does not see thermal orpressure cycling, then maybe. Composite is still my first suggestion.
= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: Super Deuplex or Inconel Grade
The correct selection between the two options (FRP and lined metallic piping) depends on a great many factors the OP hasn't listed. Yes, lined metallic piping suffers from the vulnerability you've indicated, amongst others, but FRP piping is not without its pitfalls as well- especially at small linesizes (i.e. 1.5" and 2"). Just as you've seen liner failures leading to rapid loss of containment, I've seen Smith Fibrecast fittings which leak at several hundred locations right out of the box, and carefully assembled and fully cured socket-welded FRP pipe spools which exhibited 90% joint leakage during a hydrotest. Properly designed, tested, installed and monitored/ maintained, both systems can be fit for purpose.