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NORSOK STANDARD
COMMON REQUIREMENTS
WELDING AND INSPECTION OF PIPING
M-CR-601
Rev. 1, December 1994
Welding and Inspection of piping M-CR-601
Rev. 1, December 1994
CONTENTS
1 FOREWORD 2
2 SCOPE 2
3 NORMATIVE REFERENCES 2
4 DEFINITIONS AND ABREVIATIONS 3
4.1 Abreviations 3
4.2 Definitions 4
5 WELDING QUALIFICATION REQUIREMENTS 4
5.1 General 4
5.2 Non Destructive Testing of Test Welds 4
5.3 Mechanical Testing 5
5.4 Essential Variables 8
6 WELDING REQUIREMENTS 9
6.1 General 9
6.2 Welder and Welding Operator Qualification 9
6.3 Welding Consumables 9
6.4 Preheat and Interpass Temperature 10
6.5 Backing and Shielding Gas 10
7 INSPECTION AND NON DESTRUCTIVE TESTING (NDT) 11
7.1 Personnel Qualification 11
7.2 Acceptance Criteria 11
7.3 Radiographic Testing 11
7.4 Ultrasonic Testing 11
7.5 Extent of Non Destructive Testing 12
8 REPAIR 12
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NORSOK Standard 1 of 13
Welding and Inspection of piping M-CR-601
Rev. 1, December 1994
1 FOREWORD
This standard has been developed by the NORSOK Standardisation Work Group for the
widest possible national and international application. This standard will be used as input
to the development of ISO 13703, “Platform Piping Systems”, which will replace API 14E.
2 SCOPE
This standard covers technical requirements for welding and weld inspection of piping
systems, for which NORSOK L-CR-001, «Piping and Valves» is the governing design
standard .
This standard is based on ASME B31.3 in general and as an option to use EN 288 for
welding procedure qualifications and EN 287 for welder qualifications in particular. The
ASME B31.3 shall apply with addition of the requirements given in this standard.
This standard applies to all piping fabrication including prefabrication, module assembly,
package or skid mounted units, site and field installation and shall be considered together
with applicable drawings.
3 NORMATIVE REFERENCES
ASME Boiler and Pressure Vessel Code,
Section II, Part C - Welding Rods, Electrodes, and Filler Metals
Section V - Nondestructive testing.
Section VIII - Rules for Construction of Pressure Vessels Div. 1.
Section IX - Welding and Brazing Qualification.
ASME B31.3 Code for Pressure Piping - Chemical Plant and Petroleum Refinery Piping.
ASTM E 562 Practice for Determining Volume Fraction by Systematic Manual Point
Count.
ASTM G 48 Standard Test Method for Pitting and Crevice Corrosion Resistance of
Stainless Steel and Related Alloys by the use of Ferric Chloride Solution.
ASTM A 370 Mechanical Testing of Steel Products.
DnV Classification Note No. 7, Ultrasonic Inspection of Weld Connections.
EN 287 Approval testing of welders - Fusion welding.
EN 288 Specification and approval of welding procedures for metallic materials.
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NORSOK Standard 2 of 13
Welding and Inspection of piping M-CR-601
Rev. 1, December 1994
EN 473 Qualification and certification of personnel for non destructive
examination.
EN 719 Welding coordination - Task and responsibilities.
EN 729 Quality requirements for welding - Fusion welding of metallic materials.
EN 1011 Recommendation for arc welding of ferritic steels.
EN 10204 Metallic products - Types of inspection documents.
ISO 148 Beam Impact Test V-notch for steel.
ISO 3690 Welding - Determination of hydrogen in deposited weld metal arising from
the use of covered electrodes for welding mild and low alloy steels.
ISO 4136 Fusion-welded butt joints in steel - Transverse tensile tests.
ISO 5173 Fusion welded butt joints in steel - Transverse root and face bend test.
ISO 5177 Fusion welded butt joints in steel - Transverse side bend test.
NS 477 Rules for approval of welding inspectors.
NACE
MR0175 Sulfide Stress Cracking Resistant Metallic Materials for Oilfield
Equipment.
NORSOK
L-CR-001 Piping and valves.
4 DEFINITIONS AND ABREVIATIONS
4.1 Abreviations
CE Carbon Equivalent
NACE National Association of Corrosion Engineers
NDT Non Destructive Testing
NPS Nominal Pipe Size
PN Nominal Pressure
PRE Pitting Resistance Equivalent, PRE = % Cr + 3.3 % Mo + 16 x % N
SMYS Specified Minimum Yield Strength
UNS Unified Numbering System
WPS Welding Procedure Specification
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NORSOK Standard 3 of 13
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