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Nafta i Plin, Vol. 44. No. 182.-183., 2024.

Stručni rad

Assessment of the efficiency of the cathodic protection system as an integral part of the assessment of pipeline integrity

Stjepan Pavliša
Goran Pavliša

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str. 79-84

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Sažetak

During the exploitation of buried and submerged steel pipelines and tanks, cathodic protection as a means of continuous corrosion control significantly contributes to maintaining pipeline integrity. Pipeline integrity refers to its ability to safely operate under predetermined conditions, including pressure. MAOP (Maximum Allowable Operating Pressure) represents the maximum pressure under which a pipeline can safely operate without the risk of perforation and fluid loss.
Given that cathodic protection is considered an exceptionally effective technique whose efficiency needs to be monitored, the user or maintainer of the system can successfully assess its effectiveness using certain tools. This assessment should be part of the overall integrity management. In this context, it is necessary to develop a program for system operation using current normative references, and then, based on the collected data, which have a minimum scope defined by the standard, make an evaluation of effectiveness.
Data can be obtained through remote reporting and field testing. Data collected through remote reporting provide an image of continuity/discontinuity of operation, while field testing results are analysed in terms of achieved cathodic polarization. To use the described program, it is necessary to define the system observation boundaries in advance, especially in the case of very long pipelines, a large number of steel tanks, etc. In such cases, the system can be systematized in the form of separate sections or individual tanks.
The assessment of cathodic protection effectiveness should result in the overall state and identify those sections of the pipeline or individual tanks where the cathodic protection system is inadequate.
In summary, by evaluating the effectiveness of cathodic protection, the owner obtains an important parameter used as one of the input data in the final integrity assessment and the potential implementation of corrective actions.

Ključne riječi

efficiency; MAOP; cathodic protection; pipeline integrity; data acquisition; remote sensing; field measurements; integrity management; remedial actions

Hrčak ID:

323264

URI

https://hrcak.srce.hr/323264

Datum izdavanja:

15.12.2024.

Podaci na drugim jezicima: hrvatski

Posjeta: 0 *

Publication date: 15 December 2024

Volume: 44

Issue: 182. - 183.

Pages: 79-84

DOI:

Article Information (continued)

Categories:

Subject: Stručni rad

Categories:

Subject: Professional Paper

Keywords:

Keyword: učinkovitost

Keyword: katodna zaštita

Keyword: integritet cjevovoda

Keyword: podaci o funkciji sustava katodne zaštite

Keywords:

Keyword: efficiency

Keyword: MAOP

Keyword: cathodic protection

Keyword: pipeline integrity

Keyword: data acquisition

Keyword: remote sensing

Keyword: field measurements

Keyword: integrity management

Keyword: remedial actions

Procjena učinkovitosti sustava katodne zaštite kao sastavni dio procjene integriteta cjevovoda

Translated Title (en): Assessment of the efficiency of the cathodic protection system as an integral part of the assessment of pipeline integrity

[ORCID] Stjepan Pavliša[1]

Email: info@pa-el.hr

 

PAVLIŠA OBJEKTI (PA-EL d.o.o.) PAVLIŠA OBJEKTI (PA-EL d.o.o.) Dubrovčan 33 B, 49214 Veliko Trgovišće

[ORCID] Stjepan Pavliša[1]

Email: info@pa-el.hr

 

PAVLIŠA OBJEKTI (PA-EL d.o.o.) PAVLIŠA OBJEKTI (PA-EL d.o.o.) Dubrovčan 33 B, 49214 Veliko Trgovišće

[ORCID] Goran Pavliša[1][1]

 

PAVLIŠA OBJEKTI (PA-EL d.o.o.) PAVLIŠA OBJEKTI (PA-EL d.o.o.) Dubrovčan 33 B, 49214 Veliko Trgovišće

Author notes:

Correspondence to: [*] Stjepan Pavliša, PAVLIŠA OBJEKTI (PA-EL d.o.o.), Dubrovčan 33 B, 49214 Veliko Trgovišće info@pa-el.hr

Abstract

Tijekom eksploatacije ukopanih i uronjenih čeličnih cjevovoda (konstrukcija) jedna od ključnih mjera za očuvanje integriteta jest kvaliteta održavanja sustava zaštite od korozije. Katodna zaštita predstavlja najučinkovitiju aktivnu mjeru za zaštitu čeličnih cjevovoda (konstrukcija) od korozije. Korisnik ili održavatelj može, koristeći određene alate, procijeniti razinu njene učinkovitosti. Procjena učinkovitosti katodne zaštite je integralni dio procjene integriteta cjevovoda (konstrukcije) i važan pokazatelj očuvanja njegovih bitnih konstrukcijskih svojstava. Za procjenu učinkovitosti rada katodne zaštite i kvalitete održavanja potrebno je izraditi program koji će koristiti norme za ispravno funkcioniranje sustava katodne zaštite. Temelji se na analizi podataka prikupljenih tijekom održavanja i ispitivanja u određenom periodu. Program treba prikupiti minimalne propisane podatke o radu, nadzoru ili ispitivanju sustava katodne zaštite. Također, treba analizirati podatke prikupljene daljinskom dojavom i terenskim ispitivanjima. Parametri dobiveni daljinskom dojavom su dio prve ocjene učinkovitosti kao pokazatelji kontinuiteta rada, dok su rezultati terenskih mjerenja indikatori dostignute razine katodne polarizacije. Prije korištenja programa, za svaki sustav katodne zaštite treba definirati granice promatranja, posebno kod izrazito dugih cjevovoda ili velikog broja ukopanih/ samostojećih spremnika. Treba odrediti dionice cjevovoda i svaki spremnik posebno. Preciznom ocjenom učinkovitosti katodne zaštite definira se opće stanje te identificiraju dijelovi cjevovoda gdje sustav katodne zaštite nije adekvatan. Ovom procjenom učinkovitosti, vlasnik cjevovoda dobiva jedan od parametara za procjenu integriteta cjevovoda, što služi kao osnova za poduzimanje mjera u narednom periodu eksploatacije.

Translated Abstract

During the exploitation of buried and submerged steel pipelines and tanks, cathodic protection as a means of continuous corrosion control significantly contributes to maintaining pipeline integrity. Pipeline integrity refers to its ability to safely operate under predetermined conditions, including pressure. MAOP (Maximum Allowable Operating Pressure) represents the maximum pressure under which a pipeline can safely operate without the risk of perforation and fluid loss. Given that cathodic protection is considered an exceptionally effective technique whose efficiency needs to be monitored, the user or maintainer of the system can successfully assess its effectiveness using certain tools. This assessment should be part of the overall integrity management. In this context, it is necessary to develop a program for system operation using current normative references, and then, based on the collected data, which have a minimum scope defined by the standard, make an evaluation of effectiveness. Data can be obtained through remote reporting and field testing. Data collected through remote reporting provide an image of continuity/discontinuity of operation, while field testing results are analysed in terms of achieved cathodic polarization. To use the described program, it is necessary to define the system observation boundaries in advance, especially in the case of very long pipelines, a large number of steel tanks, etc. In such cases, the system can be systematized in the form of separate sections or individual tanks. The assessment of cathodic protection effectiveness should result in the overall state and identify those sections of the pipeline or individual tanks where the cathodic protection system is inadequate. In summary, by evaluating the effectiveness of cathodic protection, the owner obtains an important parameter used as one of the input data in the final integrity assessment and the potential implementation of corrective actions.

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