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Corrosion Management Learnings For Atmospheric Storage Tanks

Corrosion Management Learnings for Storage Tanks
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The terminal is subdivided for Oil, Gas and Produced Water plants. Each of these plants has number of storage tanks. The age of the tanks varies between 15-25 years.  The products held within these tanks varies, from crude oil, condensate, produced water, potable water, to off spec oil and diesel fuel.

Most of the tanks within the facility have a similar CP arrangement and design.  Each tank base is protected by an impressed current grid mesh anode buried in compacted, clean, sand backfill beneath the tank base and is powered by a transformer-rectifier placed outside the bund wall or within an electrical switch room.  Permanent reference electrodes are installed beneath all tank bases to enable accurate potential measurements. Reference electrodes vary from Copper/Copper Sulphate, Silver/Silver Chloride to Zinc.  

Product Number: 51322-17951-SG
Author: Gulnur Badalova, Mikael Johansson
Publication Date: 2022
Industries: Gas/Liquid Pipelines , Water/Wastewater , Coatings
$0.00
$20.00
$20.00

Historical inspections of atmospheric storage tanks in a major onshore Oil and Gas terminal identified underside floor corrosion. Investigations suggested that the corrosion was likely caused by a number of factors, namely, issues with the cathodic protection (CP) system and water ingress. Based on previous experience gained from atmospheric storage tanks inspection of similar design, a decision was taken to act on this matter.

The intent of this paper is to share learnings and observations on how potential damages were flagged, repaired and/or mitigated, including improvements made at site to ensure repeat issues do not occur, maintenance costs are reduced, and reliability is maintained for long-term utilization 

Historical inspections of atmospheric storage tanks in a major onshore Oil and Gas terminal identified underside floor corrosion. Investigations suggested that the corrosion was likely caused by a number of factors, namely, issues with the cathodic protection (CP) system and water ingress. Based on previous experience gained from atmospheric storage tanks inspection of similar design, a decision was taken to act on this matter.

The intent of this paper is to share learnings and observations on how potential damages were flagged, repaired and/or mitigated, including improvements made at site to ensure repeat issues do not occur, maintenance costs are reduced, and reliability is maintained for long-term utilization 

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CP upgrade options for aboveground storage tanks

Product Number: MPWT19-14297
Author: Mohammed Alotaibi
Publication Date: 2019
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Storage tanks are the primary means for storing large volumes of liquids and gaseous products. Metal
loss from internal and external corrosion can reduce the service life of a tank. It is important to maintain
the integrity of steel storage tanks for safety, economic, and environmental reasons.
Saudi Aramco implemented three different scenarios of cathodic protection (CP) during bottom plate
replacement for three typical tanks. The tanks’ bottom plates were replaced based on thickness
measurements and visual inspection that revealed severe corrosion from soil. The main reason for
such corrosion was due to the asphalt layer underneath the tank. It was considered during the
replacement of the bottom plate to provide a reliable external (CP) and leak detection system. The
purpose of this paper is to demonstrate the experience gained from executing CP upgrades, and to
provide the best option to ensure integrity, cost saving and fewer shutdown periods.
Picture for Premature Failure of API 650 Oil Storage Tank Bottom Plates Due to Soil Side Corrosion
Available for download

Premature Failure of API 650 Oil Storage Tank Bottom Plates Due to Soil Side Corrosion

Product Number: 51317--9025-SG
ISBN: 9025 2017 CP
Author: Naif Abri
Publication Date: 2017
$20.00

The above ground storage tanks in the refinery are experiencing bottom plate underside (soil) corrosion at a high rate of 1mm/year. Results: Failure of 4 tanks within a period of 9 years. Observations, details of the CP survey, tests, results and forward path taken up.

 
Picture for Corrosion Inhibition Of Carbon Steel In Carbonate Acidizing At Elevated Temperature
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Corrosion Inhibition Of Carbon Steel In Carbonate Acidizing At Elevated Temperature

Product Number: 51322-17562-SG
Author: Limin Xu, Tao Chen, Ming Han, Mohammed Bataweel
Publication Date: 2022
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A suitable acid package in matrix acidizing application is very important to the stimulation employed to improve the productivity of carbonate reservoirs. Typically, concentrated acids between 5 and 28 wt% are used and the most used mineral acid for carbonate acidizing treatment is hydrochloric acid (HCl) 1,2. A significant challenge of acidizing treatment is corrosion loss of metal tubulars due to the high reactivity of acid and metal, especially at high temperatures. Corrosion inhibitors are needed to reduce the corrosion loss of steel surface of facilities exposed in acidic environment.
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