AMPP Store - NACE Conference Papers

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Impact of Pre-Corrosion on Corrosion Inhibitor Performance: Can We Protect Aged Pipelines?

Product Number: 51317--8919-SG

ISBN: 8919 2017 CP

Author: Yao Xiong

Publication Date: 2017

$20.00

Impact of pre-existing corrosion (pre-corrosion) on Corrosion Inhibitor (CI) performance was evaluated in conditions unfavorable of protective scale formation. CI protectiveness was significantly reduced after a 3-day pre-corrosion period.

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Impact of Specimen Geometry on Cathodic Disbondment Testing for Protective Coatings

Product Number: 51319-13367-SG

Author: Jessica Torrey

Publication Date: 2019

$20.00

At NACE Corrosion 2018 researchers provided a side-by-side comparison of two cathodic disbondment test methodologies: NACE TM0115 and ASTM G8. During this testing the cathodic disbondment results varied based on specimen geometry contrary to previous findings which claim independence. Researchers designed a subsequent experiment to further elucidate the results of the prior study. The approach utilized NACE TM0115 test standard and a matrix of two coating systems and five sample geometries. One test set-up evaluated the following samples in immersion: 2-inch 3-inch and 4-inch diameter pipe as well as 4-inch by 6-inch flat panels. A second test set-up utilized the attached cell method. The paper presents the results of this experiment and provides recommendations to create a more robust test method for correlating cathodic disbondment testing to the selection of coatings systems to be used in conjunction with cathodic protection.

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Impact of Support Dissolution on the Corrosion Resistance of 316L Stainless Steels

Product Number: 51321-16449-SG

Author: Stephanie Prochaska/Owen Hildreth

Publication Date: 2021

$20.00

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Impact Of Surface Conditions On Calcium Carbonate (Caco3) Scaling Kinetics In A Once-Through Capillary Flow Rig

Product Number: 51321-16562-SG

Author: Kabir Raheem/ Thibaut Charpentier/ Olujide Sanni/ Anne Neville

Publication Date: 2021

$20.00

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Impact of Surface Finishing on Corrosion Inhibition Performance

Product Number: 51317--9175-SG

ISBN: 9175 2017 CP

Author: Zhengwei Liu

Publication Date: 2017

$20.00

The effect of carbon steel coupon surface finishing processes on corrosion in a carbon dioxide environment with high and low salinity. The system was also tested with and without chemical inhibitors.

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Impact of Unreacted Mea-Triazine on Refinery Operation

Product Number: 51321-16832-SG

Author: James Ondyak; James Noland; Parag Shah

Publication Date: 2021

$20.00

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Impact of Very Low Concentration of Soluble Salts on Coatings Performance

Product Number: 51319-13218-SG

Author: Andy Bodington

Publication Date: 2019

$20.00

For offshore platform maintenance coating operation dry grit blasting is a common practice to clean the steel surface. The offshore platform steels are in a various degree of corrosion. It is well known that dry grit blasting alone cannot remove salts completely and some residual salts remain on blasted steel surface. In offshore corrosive environment grit blasted steel surfaces will quickly become rusted within a couple of hours. It is hard to keep the desired near white metal finish for 2-4 hours until the coating spray application. There are several commercial cleaning chemicals to remove residual salts and to extend the surface cleanliness time.This paper covers the testing and comparison of some of these chemicals and impact on coating performance. The evaluation was in 2 parts:1. Compare various salt removal solutions.2. Evaluate the compatibility and impact of the best salt removal solution on coating performance.In the first part of the testing tests showed that one of the products did out-perform the other chemicals to remove residual salts and maintain a desired surface pH.The second part of testing was done since there was a concern about the compatibility of the salt removal product and coatings. Thus the best salt removal product was then further tested with various coating types applied. Three (3) atmosphere coatings and three (3) tank linings (immersion grade) were selected for the compatibility study.The conclusion was that one salt removal solution did out-perform other systems and the salt removal solution was compatibility with the various coatings and improved performance of the coating.

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Impact of Welder Performance on the Integrity of Welds, and Enhancement of Welds Quality

Product Number: MPWT19-15249

Author: FANDEM, QASEM A, ALSUBAIKHY, HANI A, GHAMDI, ABDULRAHMAN M.

Publication Date: 2019

$0.00

Piping and pipeline are considered to be 60-70% of the oil and gas industry equipment. One of the most crucial factors to complete high quality projects within planned schedules is to focus on the quality of welding activities. Furthermore, the non-skilled welder is considered as a main parameter to produce welds with imperfections beyond the acceptable limits. Welders should have the required welding skills to perform the welding activities and produce sound welds, resulting in low weld rejection. On the other hand, poor welder’s performance produces low quality welds which affect the integrity of the welds and contribute to project delay and increase costs. This paper addresses methods to qualify welders and monitor their performance throughout the project lifecycle. The paper will study ISO 9606 approval testing of welders, American Welding Society (AWS) and American Society of Mechanical Engineers (ASME) Sec IX minimum requirements to qualify and certify welders. It will also illustrate the main variables that may contribute to high welding rejection rate, that are directly associated with the welders’ qualification and performance. Moreover, it will study the method of qualifying welders for different levels to properly assign welders based on load and criticality to avoid high welding rejection rate. The study shows that welders’ skill is the main parameter to produce high quality welds. Focusing on the causes of common welding defects, then educate and train the welders on the main factors causing these welding defects, will leave an influence to prevent defect recurrence

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Implementation Of An Innovative Subsea Corrosion Monitoring Device To Manage Corrosion In A New Subsea Development

Product Number: 51321-16715-SG

Author: B. A. Lasebikan; D. Hamilton; H. Sleire; H. Martinussen

Publication Date: 2021

$20.00

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Implications of Using the Fugacity of the Acid Gases in the Design of Qualification Testing of Oilfield Tubular Materials

Product Number: 51319-12939-SG

Author: Rudolf Hausler

Publication Date: 2019

$20.00

The transition from partial pressure to fugacity in the assessment of acid gas activity (concentration) for the design of qualification testing of metals to be used in sour service according to MR0175/ISO 15156 entails a number of important consequences. This transition came about in the wake of oil and gas production moving off-shore to ever higher pressures and temperatures. It was recognized that multiplying total pressure by the mol fraction of H2S in the “gas phase” could no longer reflect the physicochemical realities with respect to the reactions between H2S and the metal surfaces. As a consequence it was proposed that the activity of H2S in the gas phase should be replaced by the activity (concentration) of H2S in the aqueous phase. This change in paradigm had already been accepted in the ISO Standard but not implemented. Nevertheless it stands to reason that the dissolved H2S is the active corrosion vector rather than the H2S in the gas phase.An unintended consequence of this shift in thinking lies in the fact that a very large number of Heritage Metals have been qualified for partial pressure criteria as specified in MR0175/ISO-15156 by the use of the Crolet Diagram i.e. as function of pH vs. pH2S. In order to overcome this difficulty it is proposed to generate an array of look-up tables preferably in electronic form to translate the experimental conditions from pH2S to cH2S. This translation has to be made as a function of the test parameters (to the extent they may be known) as well as the field parameters. In parallel the pH2S axis in the Crolet diagram will need to be changed to a cH2S axis. In this manner it will be possible to assign to existing test data corresponding field conditions or vice versa specific field conditions can be used to select the appropriate metal from existing test data.An additional outcome of this methodology will be a quantitative assessment of the excess conservatism practiced in the past.

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Importance of HF Acid Concentration on the Effect of Residual Elements

Product Number: 51319-13428-SG

Author: Huang Lin

Publication Date: 2019

$20.00

Past HF alkylation operation experience and several industry research projects have reported that the carbon steel corrosion rate in HF acid is strongly affected by the residual elements (RE) content (Cu Ni and Cr). Low RE carbon steel has been recommended for new construction of carbon steel equipment and piping in main acid service trace acid service and dilute HF service in API 751.However one aspect that is often overlooked is the effect of the local concentration of HF acid on low RE steel. At low concentrations low RE carbon steel can be subject to preferential corrosion when it is coupled with high RE carbon steel. Normally only the bulk HF concentration in a process stream is available. It is challenging to determine the actual local HF acid concentration in a practical manner. This paper discusses the possible variations of HF acid concentration in typical HF alkylation processing systems and the corresponding effects of RE on HF corrosion. Possible electrochemical mechanisms of RE on HF corrosion are also studied. Several RE related preferential HF corrosion cases reported in the past have also been reevaluated from the HF acid concentration point of view. Evaluation of actual local HF acid concentration is strongly recommended when low RE carbon steel is applied. This can be more critical to the modified HF alkylation process which utilizes modified HF with a lower volatility and can have different HF concentration in the fractionation section.

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Importance of Steel Alloying Elements in Geothermal Environment – Nickel Sulphur Interactions

Product Number: 51321-16435-SG

Author: Svava Davíðsdóttir/Andri Í. Þórhallsson/Sæmundur Guðlaug/Kolbrún Ragna Ragnarsdóttir//Dagur Ingi Ólafsson/sson/James D. Maddison

Publication Date: 2021

$20.00

NACE Conference Papers

Association for Materials Protection and Performance