safety and failure in gas pipelines are very important in gas and petroleum industry. for this reason, it is important to study the effect of different parameters in order to reach the maximum safety in design and application. in this paper, a three dimensional finite element analysis is carried out to study the effect of crack length, crack depth, crack position, internal pressure and pipe thi...

Economical design with sufficient fracture resistance is of high importance in any offshore pipeline projects. Using an Engineering Critical Assessment (ECA), alternate acceptance criteria for pipeline girth weld inspection can significantly reduce the cost of constructing of offshore oil and gas pipeline by minimizing unnecessary repairs. Offshore pipelines consist of short pipeline segments c...

Abstract Steel pipes are widely used in offshore structures and buried seafloor pipelines. Buried single-wall pipelines or piles of fixed platforms crossing the earthquake fault can experience very large displacement, which could cause considerable damages failures to pipes. The elevated strains induced from welding connection between also drastically reduce pipe’s performance. Therefore, preve...

We designed heuristics for applying the list scheduling algorithm to processors with complex pipelines. On these processors the pipeline can stall due to resource contention (structural hazards) in addition to the usual data hazards. Conventional heuristics consider only data hazards. Our heuri-stics reduce structural hazards, too. Code with much instruction-level paral-lelism is optimized to a...

Abstract Existing natural gas pipelines provide an economic alternative for the transport of hydrogen (H 2 ) in envisioned economy. Hydrogen can dissolve steel and cause embrittlement (HE), compromising pipeline structural integrity. HE causes subcritical cracking, decreases ductility fracture toughness, increases fatigue crack growth rate (FCGR). This work analyzes testing standards gaseous us...