Spiralis
Materials
- Jan 4, 2005
- 12
For equipment that is used to analyse ppm of sulfur-components we use Sulfinert(R)-layer of stainless steel. Now I got a question if we can use a Nickel alloy 625 (UNS N06625) that is not Sulfinert(R) instead. Alloy625 is very good in H2S environment, but applying Sulfinert(R) coating is difficult on nickel alloys.
Sulfinert(R) is a product of Restek Performance Coating.
My question is: Are the natural passivating layer on alloys like Nickel alloy 625 better, equal or worse than a Sulfinert(R) coating on stainless steel when it comes to preventing loss of H2S by hydrogen going through the layer and into the material?
As long as we have followed requirements of hardness given in NACE MR0175, we have not experienced any failure in our system at 150deg C in oil/gas fluid, but now we are going to analyse the H2S levels and don't want to risk that the H2S is "gone into the material" when analysing the fluid. The reason for using nickel alloys instead of coated stainless steel is the high temperature environment with CO2, chlorides and H2S.
Sulfinert(R) is a product of Restek Performance Coating.
My question is: Are the natural passivating layer on alloys like Nickel alloy 625 better, equal or worse than a Sulfinert(R) coating on stainless steel when it comes to preventing loss of H2S by hydrogen going through the layer and into the material?
As long as we have followed requirements of hardness given in NACE MR0175, we have not experienced any failure in our system at 150deg C in oil/gas fluid, but now we are going to analyse the H2S levels and don't want to risk that the H2S is "gone into the material" when analysing the fluid. The reason for using nickel alloys instead of coated stainless steel is the high temperature environment with CO2, chlorides and H2S.
