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BS EN ISO 21857:2021

BS EN ISO 21857:2021

$215.11

Petroleum, petrochemical and natural gas industries. Prevention of corrosion on pipeline systems influenced by stray currents

Published By Publication Date Number of Pages
BSI 2021 78
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This document establishes the general principles for the evaluation and minimization of the effects of stray current corrosion on external surfaces of buried or immersed pipeline systems caused by AC and DC electrical interference.

Other stray current effects such as overheating, and interference with welding operations are not covered in this document.

A brief description of AC effects, general principles and some guidelines, are provided.

NOTE 1

See ISO 18086 for the effects of alternating current on buried or immersed pipelines.

Systems that can also be affected by stray currents include buried or immersed metal structures such as the following:

  1. pipeline systems;

  2. metal sheathed cables;

  3. tanks and vessels;

  4. earthing systems;

  5. steel reinforcement in concrete;

  6. sheet steel piling.

This document gives guidelines for

  • the design of cathodic protection systems that might produce stray currents,

  • the design of pipeline systems, or elements of pipeline systems, which are buried or immersed, and which can be subject to stray current corrosion, and

  • the selection of appropriate protection or mitigation measures.

Internal corrosion risks from stray currents are not dealt with in detail in this document but principles and measures described here can be applicable for minimizing the interference effects.

NOTE 2

The impact of electromagnetic interference on above-ground appurtenances of pipeline systems is covered in EN 50443 , IEC 61140 , IEC 60364-4-41 , IEC 60479-1 , IEC 60364-5-52 , IEC/TS 61201 and IEC/TR 60479-5 .

This document can also be used for pipeline systems outside of the petrochemical and natural gas industries and other buried or immersed structures.

NOTE 3

EN 50162 provides guidance for railway related structures.

PDF Catalog

PDF Pages PDF Title
2 undefined
3 64_e_stf.pdf
5 European foreword
Endorsement notice
8 Foreword
9 Introduction
10 1 Scope
2 Normative references
11 3 Terms and definitions
12 4 Abbreviations and symbols
4.1 Abbreviations
13 4.2 Symbols
14 5 Information exchange and co-operation
15 6 Common sources of interference that can affect corrosion
6.1 General
16 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
17 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
18 6.5.3 Tidal interference effects
7 Identification and measurement of stray current interference
7.1 Principle
19 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
20 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
21 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
22 8.2 Corrosion rate
23 8.3 Criteria for steel and cast iron
8.3.1 Time constant interference
24 8.3.2 Time variant interference
25 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
26 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
27 9.2.5 Cathodic protection systems
28 9.2.6 Telluric interference
9.2.7 Direct current communication systems
10 Modifications to the interfered structure
10.1 General
29 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
30 10.2.5 Modifying the electrical continuity of the interfered structure
31 11 Inspection and maintenance
32 Annex A (informative) Use of current probes to evaluate fluctuating stray current interference on cathodically protected structures
35 Annex B (informative) Determining the relevant position for placing reference electrodes, coupons and probes in case of any conductive coupling caused by stray currents
42 Annex C (informative) Operating principles of electrical resistance probes
43 Annex D (informative) Geomagnetic interference
52 Annex E (informative) High voltage direct current interference
54 Annex F (informative) Alternating Current Interference
59 Annex G (informative) Tidal Effects
60 Annex H (informative) Photovoltaic interference
63 Annex I (informative) Modelling the effects of stray current interference on cathodically protected pipelines
67 Annex J (informative) Assessment of the corrosion risk for steel in concrete or for cathodically protected structures under time variant interference conditions
72 Annex K (informative) Principles of anodic and cathodic interference
75 Bibliography

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BS EN ISO 21857:2021
$215.11