Thanks for the follow up posts CoCoCa and EdStainless! Yes SS316L is considered for the service and since this is just a single clad equipment below 38mm thickness, we're doing PWHT. EdStainless - Lean Duplex was being considered but has fallen out of contention due to lower pH2S limits per...
You can get it from the simulation softwares Hysys or Unisim. ISO 15156 annex C says that a good approximation for bubble point pressure would be the pressure of last gas separation, which if you verify using the above softwares would tend to be very close.
Regards,
Suraj Tinani
Use Section 2.B.11 of API 581 to calculate corrosion rates in oxygenated waters in open or closed system. The equation to calculate CR as per API 581 is:
CR = CRB x FT x FV where CRB is the Base Corrosion Rate, FT is the Temperature Adjustment Factor and FV is the Flow Velocity Adjustment...
Thanks for your posts!
EdStainless - We're probably going with Hot Roll Bonded SS 316L plates (3 mm) and then weld them together so PWHT cannot be done beforehand. Besides PWHT is inevitable if required by code so we're ensuring that IGC testing is done for corrosion resistance.
Metengr - I...
Yes CoCoCa, you need to consider the equilibrium gas composition. Your H2S/CO2 concentrations in vapor phase of the liquid line will be same as the gas outlet of the slug catcher. You can verify this using Hysys or Unisim softwares.
ChihebG, try the BS EN ISO 21457 : Petroleum, petrochemical and natural gas industries — Materials selection and corrosion control for oil and gas production systems. This standard gives materials options/recommendations for various services. Use it with discretion!
API RP945 does not cover SS equipment/piping in amine service. Hence the question is whether PWHT is required for CS equipment/piping which is fully clad with SS316L and handling Rich amine service or would the velocity restrictions (less than 3 m/s or 10 f/s) suffice?
Maximum operating...
As per ISO 15156-3 table A.2, hardness for Austenitic SS described in A.2 is 22 HRC. Is the value for the parent metal or the same hardness limit applies to HAZ and Weld as well? Thanks in advance!
