To reduce the human exposure risk during offshore structure inspection, Remotely Operated underwater Vehicle (ROV) is a widely used solution. This paper couples an inspection class ROV with autonomous surface vehicle (ASV) via launch and recovery system (LARS) in nonlinear numerical model. Operational missions both static moving targets are modelled for this ASV/ROV system. The reports followin...

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...

This study presents numerical simulations and experimental verification of a vibration-based damage detection technique. Health monitoring of a submerged pipe's girth-weld against an advancing notch is attempted. Piezoelectric transducers are bonded on the pipe for sensing or actuation purposes. Vibration of the pipe is excited by two means: (i) an impulsive force; (ii) using one of the piezoel...

Managing pipe damaged by Stress Corrosion Cracking (SCC) has been a formidable challenge to the pipeline industry. The development of a practical solution for the measurement and evaluation of SCC has been marred by the complexity of crack shapes, their distribution within a crack colony, and the lack of non-destructive technology capable of reliably measuring the crack depths. Laser ultrasonic...

Flux-cored wires are commonly used in structural and pipeline welding, shipbuilding, offshore constructions, petrochemical power generation industries. The higher heat inputs the multi-pass welding result shorter production time while considerably changing properties of welded joint. In this study, robotic flux cored arc with varying (between 0.56-2.52 kJ/mm) was performed to determine effect i...

data on body weight and body measurements (body length, height at withers, chest girth and paunch girth) of adult kilakarsal sheep have been collected from 124 adult animals managed at the farmers filed in tirunelveli districts of tami nadu, india to estimate the body weight from body measurements. the data were subjected to standard statistical analysis using spss software and linear regressio...