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Indexed by:期刊论文
Date of Publication:2016-03-01
Journal:SENSORS AND ACTUATORS B-CHEMICAL
Included Journals:SCIE、EI、Scopus
Volume:224
Page Number:37-47
ISSN No.:0925-4005
Key Words:Ring pair sensor; Internal corrosion; On-line monitoring; Temperature difference; TLC
Abstract:In this paper, a ring pair electrical resistance sensor (RPERS) has been developed for an internal-pipeline corrosion on-line monitoring system. The RPERS was divided into six segments along the circumference. The corrosion depth of each segment could be measured by using three alternating excitation currents injected into the sensor from different angles. In order to simulate and monitor the pipeline internal corrosion, a corrosion monitoring system which contained RPERS, wire electrical resistance sensor (WERS), thermocouples and a corrosion coupon was established. First, the corrosion processes in 3.5% sodium chloride solution with the temperature varied from 30 degrees C to 60 degrees C were studied. The temperature differences between the inner and outer pipe wall surfaces were measured by the top segment of RPERS. The test results revealed that the performance of RPERS is better than that of WERS in term of metal loss measurement. Then, carbon dioxide mixed with water vapour was pumped into the system with the temperature varied from 50 degrees C to 80 degrees C. In the scenarios, top of the line corrosion (TLC) occurred and was monitored by RPERS. The monitoring results demonstrated that the gas temperature and the temperature difference were important factors for TLC in sweet conditions. (C) 2015 Elsevier B.V. All rights reserved.