ДСТУ EN ISO 21857:2022 Нефтяная, нефтехимическая и газовая промышленность. Предотвращение коррозии трубопроводных систем, вызванной воздействием блуждающих токов (EN ISO 21857:2021, IDT; ISO 21857:2021, IDT)



ДСТУ EN ISO 21857:2022
(EN ISO 21857:2021, IDT; ISO 21857:2021, IDT)

Промисловість нафтова, нафтохімічна та газова. Запобігання корозії
трубопровідних систем, викликаної впливом блукаючих струмів

 
   
 
 
     
Не є офіційним виданням.
Офіційне видання розповсюджує національний орган стандартизації
(ДП «УкрНДНЦ» http://uas.gov.ua)

Contents

Foreword

Introduction

1 Scope

2 Normative references

3 Terms and definitions

4 Abbreviations and symbols

4.1 Abbreviations

4.2 Symbols

5 Information exchange and co-operation

6 Common sources of interference that can affect corrosion

6.1 General

6.2 Direct current

6.2.1 General

6.2.2 Traction systems

6.2.3 Industrial systems

6.3 Alternating current

6.3.1 General

6.3.2 Overhead and buried power lines

6.4 High-voltage direct current transmission systems

6.5 Natural interference

6.5.1 General

6.5.2 Geomagnetic (telluric) interference

6.5.3 Tidal interference effects

7 Identification and measurement of stray current interference

7.1 Principle

7.2 Stray Current interference

7.2.1 Inductive and conductive coupling from remote sources

7.2.2 Conductive coupling from nearby sources

7.3 Measurement of electrical parameters

7.3.1 Data acquisition systems

7.3.2 Possible errors in AC measurements

7.3.3 Potential measurement

7.3.4 Current measurement on probes

7.3.5 IR-free potential measurement on coupons or probes

7.3.6 Duration of the measurement

7.3.7 Specific requirements for coupons or probes

7.4 Corrosion rate measurement

8 Acceptance criteria for DC interference

8.1 Overview of criteria

8.2 Corrosion rate

8.3 Criteria for steel and cast iron

8.3.1 Time constant interference

8.3.2 Time variant interference

8.4 Criteria for steel pipes in concrete based on potential measurements without cathodic protection

8.4.1 Time constant anodic interference

8.4.2 Time variant interference

9 Reduction of DC stray current interference

9.1 General

9.2 Modifications to the source of interference

9.2.1 Principles

9.2.2 Direct current systems at industrial sites

9.2.3 Direct current systems at ports

9.2.4 Direct current traction systems

9.2.5 Cathodic protection systems

9.2.6 Telluric interference

9.2.7 Direct current communication systems

10 Modifications to the interfered structure

10.1 General

10.2 Design prerequisites

10.2.1 Coatings

10.2.2 Isolation from other structures

10.2.3 Distance to be maximized

10.2.4 Installation of mitigation devices

10.2.5 Modifying the electrical continuity of the interfered structure

11 Inspection and maintenance

Annex A (informative) Use of current probes to evaluate fluctuating stray current interference on cathodically protected structures

Annex B (informative) Determining the relevant position for placing reference electrodes, coupons and probes in case of any conductive coupling caused by stray currents

Annex C (informative) Operating principles of electrical resistance probes

Annex D (informative) Geomagnetic interference

Annex E (informative) High voltage direct current interference

Annex F (informative) Alternating Current Interference

Annex G (informative) Tidal Effects

Annex H (informative) Photovoltaic interference

Annex I (informative) Modelling the effects of stray current interference on cathodically protected pipelines

Annex J (informative) Assessment of the corrosion risk for steel in concrete or for cathodically protected structures under time variant interference conditions

Annex K (informative) Principles of anodic and cathodic interference

Bibliography