Surface Strain Measurement on Pressurized Thick-Walled Pipe by Fiber  Bragg Grating Sensor and Strain Gauges

Nur Ainaa Adhreena Muhamad Shukri; Mohd Hafizi Zohari; , E. Vorathin

Authors

Nur Ainaa Adhreena Muhamad Shukri Advanced Structural Integrity and Vibration Research (ASIVR), Faculty of Mechanical & Automotive Engineering Technology, Universiti Malaysia Pahang (UMP), 26600 Pekan, Pahang, Malaysia
Mohd Hafizi Zohari Advanced Structural Integrity and Vibration Research (ASIVR), Faculty of Mechanical & Automotive Engineering Technology, Universiti Malaysia Pahang (UMP), 26600 Pekan, Pahang, Malaysia
, E. Vorathin Advanced Structural Integrity and Vibration Research (ASIVR), Faculty of Mechanical & Automotive Engineering Technology, Universiti Malaysia Pahang (UMP), 26600 Pekan, Pahang, Malaysia

Keywords:

Fiber Bragg Grating (FBG), thick-walled pipe, surface strain, internal pressure

Abstract

The evaluation of circumferential and longitudinal strain is significant in a pipeline integrity monitoring. Through this study, fiber Bragg grating (FBG) sensors and resistance foil strain gauges (RFSG) sensors were applied to monitor and measure the circumferential and longitudinal strain on a thick-walled pressurized pipe. The experimentation was conducted on 0.6 m-long A53 seamless carbon steel pipe subjected to uniform internal pressure by using a hydro pressure test pump ranging from 0 to 5 MPa. The result reveals the excellence repeatability of the FBG sensor during loading and unloading of the pressurized pipe if compared to the RFSG sensors, with the percentage error varies from 1.08% to 6.17%. In term of linearity, FBG sensor exhibits low percentage error with 0.12% and 3.89% for longitudinal and circumferential strain respectively, while the RFSG sensors have a significant percentage error with 0.33% and 0.03%, respectively. These results confirm the stability of FBG sensor to be considered as a realistic sensor instrumentation for pipeline health monitoring.