Fiber-reinforced polymer (FRP) repair systems for corroded steel pipelines

Analysis of retrofitted corroded steel pipes using internally bonded FRP composite repair systems

“…A previous study (Sirimanna et al 2013) identified that when the LOC is greater than 80%, the VM stress increases exponentially even with low internal pressures. In addition, they concluded that, if the steel pipe has less than 80% LOC, rectification can be done using an internal composite repair; but replacement is necessary when LOC is greater than 80%.…”

“…Using the yielding of steel at the bond line as the governing criteria, design nomographs were developed by (Sirimanna et al 2013) to represent the relationship of internal pressure and LOC for different composite repair thicknesses as shown in Figure 8. In these graphs, zero thickness corresponds to pristine steel and the analysis was performed up to a composite repair thickness of 22 mm, where approximately 50% internal area of the pipe was reduced.…”

Analysis of failure modes in pipe-in-pipe repair systems for water and gas pipelines

“…GPa (2176 ksi), 10 GPa (1450 ksi), 5 GPa (725 ksi) and 1 GPa (145 ksi) were investigated to provide a wide range of materials (i.e., unreinforced polymers, fiber reinforced thermosets and thermoplastics polymers, steel/polymer hybrid layers, particulate-filled polymers) that are intended to be representative of potential PIP material systems as shown in Table 1. Based on the initial material properties of the 24 internal repair technologies reported in Sirimanna et al [14], the design strain for the analysis of the PIP systems was divided into two, i.e. 0.002 for metallic systems (70 GPa or 10,153 ksi or higher) and 0.02 for polymeric systems including composites and thermoplastics (24.5 GPa or 3553 ksi or lower).…”

“…This has led to research and development of different repair technologies. Sirimanna et al [14] provided an extensive overview of internal composite repair technologies for corroded pipelines and evaluated their suitability in terms of their maximum allowable working pressure, pipe diameter and service temperature. The impact resistance of PIP is reduced due to corrosion defects under transverse impact load and aggravated the damage of inner pipe [15].…”

Perspective Application Directions of Fiber Optic Lasers in the Repair and Renewal Operations on the Linear Part of Main Gas Pipelines

“…Consequently, the performance of the entire Russian gas transportation system as well as the profitability of the energy industry in general depends on the quality of their construction and technical condition [1][2][3][4][5][6][7][8][9][10].…”