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Multi-Parameter Optical Fiber Sensor For Simultaneous Corrosion And Humidity Monitoring

Picture for Multi-Parameter Optical Fiber Sensor For Simultaneous Corrosion And Humidity Monitoring
Available for download
Product Number: 51321-16909-SG
Author: Ruishu F. Wright; Nathan Diemler; John Baltrus; Ping Lu; Margaret Ziomek-Moroz; Michael Buric; Paul R. Ohodnicki, Jr
Publication Date: 2021
$0.00
$20.00
$20.00

For long-distance natural gas pipelines, it is important to monitor and locate corrosion events,
especially for internal corrosion. Water vapor condensation can provide aqueous electrolytes necessary
for corrosion to occur inside the pipe. Based on previous work, a multi-parameter optical fiber sensor
was developed and demonstrated for simultaneous monitoring of corrosion and water/humidity with
location information along the fiber. Corrosion was detected through light intensity changes associated
with the corrosion proxy coating and the presence of water was monitored based on water-induced
strain changes on the optical fiber. The multi-parameter sensor was tested in both aqueous (acidic
solution) and humid gas (N2 or CO2) conditions. As the humidity varied between 0% relative humidity
(RH) and 100%RH, the single-mode fiber section showed water sensing capability with good
reversibility and sensitivity. The corrosion sensor didn't show cross-sensitivity to humidity. In corrosive
conditions, the corrosion sensor showed an increase in the backscattered light intensity at corroded
locations because light absorption of the metallic thin film decreased as the film was corroded.
Importantly, the corrosion sensor was able to monitor localized corrosion in wet CO2 gas, which is representative of internal corrosion in natural gas pipelines. The XPS (X-ray photoelectron
spectroscopy) results indicate formation of iron carbonate after wet CO2 corrosion.

For long-distance natural gas pipelines, it is important to monitor and locate corrosion events,
especially for internal corrosion. Water vapor condensation can provide aqueous electrolytes necessary
for corrosion to occur inside the pipe. Based on previous work, a multi-parameter optical fiber sensor
was developed and demonstrated for simultaneous monitoring of corrosion and water/humidity with
location information along the fiber. Corrosion was detected through light intensity changes associated
with the corrosion proxy coating and the presence of water was monitored based on water-induced
strain changes on the optical fiber. The multi-parameter sensor was tested in both aqueous (acidic
solution) and humid gas (N2 or CO2) conditions. As the humidity varied between 0% relative humidity
(RH) and 100%RH, the single-mode fiber section showed water sensing capability with good
reversibility and sensitivity. The corrosion sensor didn't show cross-sensitivity to humidity. In corrosive
conditions, the corrosion sensor showed an increase in the backscattered light intensity at corroded
locations because light absorption of the metallic thin film decreased as the film was corroded.
Importantly, the corrosion sensor was able to monitor localized corrosion in wet CO2 gas, which is representative of internal corrosion in natural gas pipelines. The XPS (X-ray photoelectron
spectroscopy) results indicate formation of iron carbonate after wet CO2 corrosion.

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Product Number: MPWT19-14242
Author: Amro Hassanein, Ahmed Elsharkawi
Publication Date: 2019
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Corrosion under insulation (CUI) is a major problem for petroleum and petrochemical process industries that affects the plant mechanical integrity and attacks assets. CUI can result in sudden and hazardous leaks (safety concern), and plant shutdowns with high losses of production (economical concern).
Traditional detecting methods of CUI to cut a window in thermal insulation used to inspect visually, to measure the thickness, and then return thermal insulation back, giving high chance for water and moisture ingress, accelerating CUI, moreover big amount of scaffolding erection along with thermal insulation removal required.
SHARQ (Eastern Petrochemical Company, one of SABIC companies) is pioneer to study CUI, evaluating many Non–Destructive techniques has proven Pulsed Eddy Current (PEC) as the most effective technique in terms of integrity and cost optimization.
Considering all available techniques, all aspects studied, such as range of applications, features, and limitations, it is concluded and verified to meet our inspection plan strategy needs.
PEC does not require thermal insulation removal; optimize scaffolding erection, has a wide range of applications related to thickness, and temperature. PEC approved by international codes and standards (API) to meet RBI Meridium software requirements.
The validation study results show cost savings of more than 50% compared to traditional thickness measurement methodology, moreover it reduces EHSS (Environment, Health, Safety, and Security) negative impact reduces the probability of safety incidents due to reducing labor, man-hours, and eliminating many associated activities with potential hazard and risk.
PEC has high productivity, easily operated, and provides comprehensive and professional inspection report
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