... CP. hydrogen embrittlement environmental assisted cracking HISC fracture mechanics cathodic protection Oil & Gas Subsea production fasteners riser bolts INTRODUCTION Characterizing Hydrogen Embrittlement Susceptibility - Methodology Overview Materials properties that are used in specific...

...INTRODUCTION Precipitation Hardened (PH) Ni base alloys are known to be sensitive to HISC, reported failures of components could be attributed to Hydrogen Embrittlement (HE) ^{1 - 3} . For the UNS ⁽¹⁾ 07718 the relationship between grain boundary precipitation and HE...

... to Hydrogen Induced Stress Cracking (HISC) resistance was studied using the Slow Strain Rate Tensile (SSRT) test method under hydrogen charging conditions. The experimental conditions included a 0.5M sulfuric acid solution at 5 mA/cm² and at 40°C at a strain rate of 10^-6 sec^-1...

... alloy UNS N08830 alloy was recently evaluated for resistance to Hydrogen Induced Stress Cracking (HISC), simulating conditions arising during cathodic protection in a subsea environment. The unique set of test methods and conditions included SSRT and ISL, all using pre-charged specimens with ongoing...

... of error of the intersection between material quality, design factors and the effect of the challenging environments of Oil & Gas subsea drilling and production operations. hydrogen embrittlement environmental assisted cracking HISC fracture mechanics cathodic protection Oil & Gas Subsea...

... where the coating has lost integrity. In the presence of a critical hydrogen concentration, all duplex and super duplex stainless steels are susceptible to hydrogen embrittlement, via a cracking mechanism commonly referred to as HISC: if critical stresses/strains are exceeded, subsea failure can occur...

..., with one corner of the manifold landing on the seabed first causing a stinger to shear off from the structure. It was the hub connectors located at this corner that cracked and had to be replaced. Mechanical engineering evaluations were combined with HISC testing results to establish safe operational...

.... After testing, the samples were washed, dried and examined under a microscope for indications of corrosion. The term “relative” CCT is used because the result obtained is relative to the o ring seal crevice former used in the test. Assessment of the Resistance to Hydrogen Induced Stress Cracking (HISC...

... in the oil and gas industry. For each environment a test program has been performed and experimental results are given. Both small diameter tubing and material with larger austenite spacing were tested for hydrogen induced stress cracking, HISC. For small diameter tubing no cracking was observed for C-rings...

...EXPERIMENTAL PROCEDURE Test material Abstract Super duplex stainless steel is susceptible to Hydrogen Induced Stress Cracking (HISC) under the influence of a Cathodic Protection (CP) system. A study has been carried out investigating the influence of CP potential on mechanical degradation of UNS...