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„Ochrona przed Korozją” (Corrosion Protection) No 08/2016

View cover and table of contents (in Polish and English) (pdf)

 

DOI: 10.15199/40.2016.8.1

Stochastic stray currents effects on earth return circuits (underground pipelines)

MACHCZYŃSKI W.

SZYMENDERSKI J.

Poznan University of Technology, Institute of Electrical Engineering and Electronics

Politechnika Poznańska

The paper presents a method of the simulation of the pipeline potential shift produced by d.c. traction stray currents which are stochastic in character, meaning that the current as well as the flow direction change at random. The key problem in the evaluation of a foreign structure response to the stray currents interference consist in the determination of the potential shift of the structure with respect to the adjacent (local) earth. To predict the potential shift due to the stray current influence, calculation methods/tools can be used, especially at design stage of new traction lines or pipelines. The calculation model presented is based on the deterministic model used in the earth-return circuit theory combined with the non-deterministic approach based on the Monte Carlo procedure, in which a locomotive position and a load current are assumed to be independent random variables. Using simulation program developed random characteristics of a pipeline response e.g. maximum, minimum, median and mean values can be obtained. Hence the pipeline regions more exposed to corrosion risk can be determined. The technical application of the method presented is illustrated by examples of computer simulation.

Keywords: d.c. traction, stochastic stray currents, earth return circuit, pipeline potential shift, simulation, Monte Carlo method

2016

Vol. 59, nr 8

s. 273-278

Ref. 16

 


 

DOI: 10.15199/40.2016.8.2

Test installation for internal cathodic protection of DN 1000 cooling water pipeline in ArcelorMittal Ostrava

JANKOWSKI J.

SOKÓLSKI W.

SPZP CORRPOL Sp. z o.o., Gdańsk

KOLEK T.

DORDA S.

KPTECH s.r.o., Ostrava

The experimental installation of internal cathodic protection of the DN1000 pipeline transporting the cooling water from the rolling mill to the Dorra settlers in ArcelorMittal Ostrava A.S. ironworks has been described. The impressed current cathodic protection with discrete anodes has been applied. In order to test the effectiveness and range of cathodic protection the section of pipeline of length 20 m has been selected, where the cylindrical Ti/MMO anodes and measuring electrodes were installed radially at various intervals. Basing on measurements of the trial cathodic polarization the target parameters of the protection system for the operating conditions of the object have been determined. It has been found that the optimum distance between the Ti/MMO anodes is approx. 5 times the diameter of the pipeline.

Keywords: cooling water pipeline, internal cathodic protection

2016

Vol. 59, nr 8

s. 280-285

Ref.. 9


 

CORROSION PROTECTION IN PRACTICE

DOI: 10.15199/40.2016.8.3

Using combined DCVG/CIPS/MTM survey to assess condition of pipeline and it’s insulation

MIRZOEV J.

MASHUROV S.

CJSC “Aerospace Monitoring and Technologies”, Moscow, Russia

SIBILA J.

CORRSTOP Sp. z o.o., Poznan, Poland

Integrity management of non-piggable pipelines up to now remains as an essential challenge for all Operators. Widely applicable aboveground survey techniques such as DCVG and CIPS alone, targeted at evaluation of pipeline coating integrity and CP effectiveness, do not entirely determine the integrity of non-piggable pipelines. Furthermore, these methods have limitation – they are not intrinsically sensitive to coating disbondment. In the meantime, over the last years Magnetic Tomography Method went through extensive industrial validation. Based on the converse magnetostrictive effect, MTM defines stress characteristics of pipe sections by registering changes in the magnetic field of the pipeline. As an effective instrument for comprehensive integrity assessment of non-piggable pipelines, authors propose to perform combined DCVG/ CIPS/МТМ survey.

Keywords: aboveground survey, DCVG, CIPS, magnetic tomography, corrosion

2016

Vol. 59, nr 8

s. 286-289

Ref.. 6

 


 

CORROSION PROTECTION IN PRACTICE

DOI: 10.15199/40.2016.8.4

Some aspects of the measurements of undreground pipeline to soil resistance – Part I

FIEDOROWICZ M.

JAGIEŁŁO M.

Operator Gazociągów Przesyłowych GAZ-SYSTEM S.A. Oddział w Gdańsku

Measurements of structures to soil resistance (coating resistances) are one of the most important ones taken in order to asses the condition of anticorrosion protection of underground steel pipelines. This article shows the basics and measurements methodic of setting of coating resistances of pipelines as well as their segments. Correct techniques of measurements have been specified for: tight insulation coated pipelines, short pipelines and pipelines with tight and defectless/flawless coating. Examples of typical mistakes in the constructions of test stations have been given as well as measurement methods that help to identify these mistakes. This paper is meant as a basis for training courses for second grade staff certification

Keywords: coating, insulated pipeline, cathodic protection, structure to soil resistance (coating resistance), test stations

2016

Vol. 59, nr 8

s. 290-295

Ref. 3

 


 

DOI: 10.15199/40.2016.8.5

Protection against corrosion due to alternating current case study on the basis of field experience

SIBILA J.

MOSSAKOWSKI J.

ŚMIERZCHALSKI J.

P.Z.A. CORRSTOP Sp. z o.o.

The paper presents the results of limitation of an interference alternating current for fourteen kms section of a gas pipeline laid parallel to the overhead high-voltage lines. Fourteen solid state decouplers were installed on that pipeline four years earlier. Measured results were compared with results obtained just after the installation. The study analysed the effectiveness of mitigation of alternating current interference on pipeline with particular emphasis on critical points.

Keywords: corrosion, cathodic protection, alternating current, solid state decoupler

2016

Vol. 59, nr 8

s. 296-300

Ref. 11

 


 

CORROSION PROTECTION IN PRACTICE

DOI: 10.15199/40.2016.8.6

New telemetry modules dedicated for cathodic protection

MALICKI M

Speckor, www.speckor.pl

The introduction section describes specific requirements for cathodic protection monitoring equipment. Next sections relate to various aspects of MT-652 telemetry module construction and operation. Powering the module and ability of a built-in battery operation in case of power outage is described. Performance and capabilities of measuring channels and additional digital inputs and outputs were detailed. In terms of configuration, measurement settings, events and rules have been outlined. At the end, communication capabilities of the module were described and examples of applications and supported telemetry systems were listed.

Keywords: telemetry, monitoring, remote measurements, cathodic protection

2016

Vol. 59, nr 8

s. 303-305

Ref. 1