...Abstract Stress Oriented Hydrogen Induced Cracking (SOHIC) is recognized as an individual cracking mechanism in NACE MR0175/ISO 15156-2. SOHIC occurrence is rare and the mechanism not fully understood but thought to be restricted to carbon and low-alloy steels with low strength and low hardness...

... HIC SOHIC Amine Caustic SCC ACSCC Materials Selection Integrity Operating Window IOW INTRODUCTION In a petroleum refinery, cost of corrosion-caused failures is a high percentage of maintenance cost. According to a comprehensive survey in US (year 1996), the total annual direct cost...

...-point bend 4Pb double-cantilever beam DCB sulfide stress cracking SSC stress-orientated hydrogen-induced cracking SOHIC hydrogen-induced cracking HIC soft-zone cracking SZC fitness-for-purpose OTI 95 635 BS 8701 sour service test method INTRODUCTION Company specifications require...

... efficiently reducing the negative impact of cyanides on the system. The main damage mechanisms likely to impact GRUs are sour water corrosion (SWC), hydrogen induced cracking (HIC), and stress oriented hydrogen induced cracking (SOHIC). All these damage mechanisms are closely related to the presence...

... was developed and demonstrated to combine the benefits of retaining a full as-welded pipe pup-piece, permitting single-sided exposure, with the advantage of tensile loading of the complete tubular specimen. Full ring sulfide stress cracking SSC stress-orientated hydrogen-induced cracking SOHIC stress...

... blisters and stress oriented HIC (SOHIC). In this paper the effect of the corrosion scenario, steel microstructure heterogeneity, steel surface condition and scales on the type of damage that is manifest will be considered, particularly in reference to legacy steels which are more prone to HIC...

...Abstract Stress Oriented Hydrogen Induced Cracking (SOHIC) is a type of environmental cracking under wet H₂S conditions, with distinctive ladder-like internal cracking. Previous SOHIC studies have indicated that tri-axial stress conditions were needed to generate SOHIC. Stress...

... corrosion phenomena in steels, such as Hydrogen Induced Cracking (HIC), Sulfide Stress Cracking (SSC), and Stress Oriented Hydrogen Induced Cracking (SOHIC). During the last 30 years, pressure vessel steels with improved SSC, and furthermore HIC, resistance have been developed to resist H₂S...

... replacement. New equipment is fabricated according best practices and recommendations indicated in documents NACE MR0103, ³ NACE 8X194, ⁴ NACE TM0177, ⁵ and NACE TM0284. ⁶ Cracking Refineries Wet H₂S HIC SCC SOHIC RBI Risk INTRODUCTION...

... revealed that the failure mode of AC specimen under external stress was type I SSC (SOHIC), while the OC and WQ specimens showed a mixture of type I and type II SSC failure mode. Pressure vessel steel sour environment microstructure diffusible hydrogen hydrogen induced cracking HIC sulfide stress...

...Quality Control Positive Metal Identification (PMI) SOHIC Weld Cracking The microstructure on the T-joint at various locations revealed the following: ○ Parent metal containing crack: The structure was banded indicating inclusion count. The matrix contained equiaxed grains of ferrite...

...There has been a certain amount of controversy over the effects of steel type and quality on the risk of SOHIC, and much of this is due to differences in terminology, and in particular different perceptions of what constitutes a “clean” and a “sour service” steel. In work carried out...

...Abstract During the last 20 years, pressure vessel steels with improved Hydrogen Induced Cracking (HIC) resistance have been developed for H₂S environments in oil and gas and refinery equipments. More recently, Stress Oriented Hydrogen Induced Cracking (SOHIC) became a question of great...

... environments, namely Hydrogen Induced Cracking (HIC), Sulfide Stress Cracking (SSC) and Stress Orientated Hydrogen Induced Cracking (SOHIC). Whereas laboratory test methods for HIC without mechanical loading are established for pipeline steels the situation is different in cases with external stress...

...As shown in Figure 1 , other studies have revealed a similar SOHIC-like phenomenon in line pipe steels whereby reduced sulfur levels increased susceptibility to through-thickness cracking under severe hydrogen charging conditions. However, this problem of SOHIC has not received the same amount...

... that quenched and tempered steels have the potential for improved performance through increased control of heat affected zone (HAZ) hardness after welding and uniform microstructure, offering excellent resistance to forms of cracking such as stress oriented hydrogen induced cracking (SOHIC). sulfide stress...

... Cracking, (SOHIC) ¹ . All these corrosion processes have been intensively studied^{( 1 , 2 , 3 , 4 , 5 )} and recommendations like H₂S/CO₂ concentration, velocities, amine degradation and contamination and post weld heat treatment (PWHT) could lead to a low...

... contained in the technical grade methanol used in the experiment, but also in the service, increases the corrosion severity of the methanolic systems significantly. methanol wet sour gas hydrogen sulphide carbon steel linepipe steel hydrogen sulphide stress cracking SSC SOHIC inhibitors...

..., making it particularly sensitive to hydrogen. The combination of inevitable traces of residual hydrogen and the hydrotest hoop stress led to destructive cracking. INTRODUCTION ERW pipes side bend test HIC SOHIC Abstract Following the recent failure of a new electric resistance welded (ERW) pipe line...

... with the test liquid as in the case of fully submerged specimens. Abstract In continuation of previous work environmental and materials related parameters were studied influencing the SOHIC susceptibility of linepipe steel. Steels according to API classification Grade 42 mainly differing in sulfur content...