... at the same partial pressures at the intended service.” ¹ This approach ignores the influence of high pressure on the cracking behavior of susceptible alloys. The consequence of this policy, while not fully understood at the time of adoption in 1976, results in a conservative, or possibly under...

... and disadvantages of using such a method for corrosion testing. gas charging high temperature high pressure aqueous simulation fugacity partial pressure corrosion testing CO₂ H₂S INTRODUCTION EXPERIMENTAL PROCEDURE Case 1 - Autoclave Tests (3.78 L) Two experimental setups were used...

...The key learning from Phase I of the Sour Water JIP was that H₂S partial pressure proved to be the third key parameter that must be considered when assessing the potential for NH₄HS corrosion in alkaline sour water systems. The influence of these three primary key parameters...

... that there is a connection between the test pressure and the percentage of CO₂, also described as partial pressure, and the failure of coatings by blistering, often understood as Cold Wall Effect blistering. The goal of this research is to identify correlations between the amount of CO₂ used in testing...

... of carbon steels or low alloy steels according to NACE MR0175/ISO 15156. Simulation results showed that the commonly used approach of assuming the H₂S concentration measured topsides to calculate the partial pressure subsea may be too conservative, overestimating the H₂S partial...

... the standard test methods^1,2,3,4 has been successful in qualifying both carbon steel and corrosion resistant alloy (CRAs) materials for field exposures by using equivalent partial pressures in lab tests. Yet the materials tested are rarely of the combination of the “hardest”, most “lean” alloy...

...Thus, these alternative parameters would suggest a less severe condition relative to a traditional ISO 15156 partial pressure sour lab test at ambient pressure. Also note that as the pressures become higher, the effect of total pressure on fugacity and aqueous concentration diverge. Thus...

...Abstract For decades, materials evaluation, selection and specification for sour service conditions has been based on the principal of partial pressure H₂S. In certain cases, it is used in combination with in-situ pH and chloride concentration to define conditions for laboratory testing...

... the impact of several process variables including NH₄HS concentration, NH₃ partial pressure, H₂S partial pressure, temperature, cyanide concentration, and velocity (wall shear stress). Data collected from laboratory tests designed to characterize these process variables were...

... a software tool to predict the corrosion rate of 14 materials evaluated in the program. sour water ammonium bisulfide NH₄HS hydrogen sulfide H₂S partial pressure isocorrosion diagram temperature chloride hydrocarbon velocity wall shear stress ammonium polysulfide APS...

... inhibitor concentration in the produced fluids as a function of the production rate, CO₂ partial pressure, and water to oil ratio. The tool used was the high speed autoclave test (HSACT) discussed in earlier publications. Statistical experimental designs were used to study the three major...