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The reference block shall be from a steel type that is representative for the steel to be norso. NDT after repair shall not be included when calculating the defect rate.

Structural steel fabrication |

Welding inspection shall be performed before, during and after welding according to typical check points listed in Annex F. The defect rate is defined as: Design drawings may show areas of welds where testing is mandatory. The temperatures shall be continuously and automatically recorded on a chart. Where ultrasonic testing is to be performed on steel produced by controlled rolling or thermo mechanical treatment, reference blocks shall be produced both perpendicular to, and parallel to, the direction of rolling.

The number of procedures to be re-qualified shall be sufficient to verify that the HAZ properties of the new material is comparable with that used for the previous qualifications.

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NORSOK M-101 (Ed. 2011)_Structural Steel Fabrication

In addition new annexes have been included. The defect rates shall be recorded on a weekly basis for VT, MT, PT, UT and RT from each production area geographically split in production areas at the same yard and shall be reported together with the accumulated defect rate. Steels Qualification and certification of NDT personnel — General principles Welding — Recommendation for welding of metallic materials – all parts Welding — Recommendation for welding of metallic materials — Part 3: The following information shall be used as noreok Latest issue of the references shall be used unless otherwise agreed.

The preheat temperatures used during repair welding should be minimum 50 qC higher than the preheat used for the original weld. Standard quality requirements Terms, definitions and abbreviations For the purposes of this NORSOK standard, the following terms, definitions and abbreviations apply.


Please fill this form, we will try to respond as soon as possible. The NORSOK standards are normally based on recognised international standards, adding the provisions deemed necessary to fill the broad needs of the Norwegian petroleum industry. You need to log in before adding standards to the monitoring service. Welds in inspection category A and B shall have unique weld number. CTOD testing is not nrsok for production testing. Lower minimum design temperatures require project specific evaluations.

Prior to fabrication start-up, contractor shall implement a system for recording of weld defect rates. Welding consumables shall be selected in accordance with G. NOTE Test assemblies may be given hydrogen diffusion treatment prior to testing, and specimens may be precompressed. We need your help to maintenance this website. Requirements for welding and inspection of stainless outfitting structures shall norsoi similar classification principles as for other structural steel elements, see annex G.

Buttering shall be welded in accordance with applicable WPS.

For material thickness less or equal to 25 mm, tack length may be minimum 4 x plate thickness. The soundness of the weld shall comply with Clause 9.

Testing performed shall be representative for the weld quality. Where steel items shall be hot dip galvanised, hollow sections shall be ventilated.

In addition to what is listed in Table 3, the following shall apply for inspection category A and B: This mm is not available if you are a URL user where you do not log in with an email address.

Temporary attachments shall be cut minimum 3 mm from the base metal and ground. CTOD testing shall be included in the qualification of welding procedures for weldments with a plate thickness below and equal 50 mm if requested by the designer for nordok specified steel quality level.

During the initial fabrication the extent of UT and MT nogsok inspection category B and C welds shall be intensified, normally to twice the level given in Table 3.


The percentage strain due to forming is defined as follows: At a weekly high defect rate or at repeated occurrence of planar defects, two trigger levels apply for extended NDT for welds in inspection category B, C and D. Scanning is in all cases to be performed from both sides of the weld and in both directions. The holding time and temperature shall be as recommended by the steel manufacturer. For highly fatigue utilized structures, more severe requirements may apply, and these will be shown on the design drawings.

However, ambiguous imperfections revealed by UT shall in addition be tested by RT; d ultrasonic testing is normally not applicable for thicknesses less than 10 mm. A web subscription provides an easy and secure access to standards, and you are guaranteed to always have the latest edition.

All inspections shall be reported to the responsible welding coordinator. Other test temperature may be prescribed by the designer. Cutting torches are not allowed for preheating. A low defect rate may be used as basis for a reduction in the extent of NDT for inspection categories B, C and D, provided that a correct defect rate identification is prepared for each weld method, each NDT method b and each production area, see Table 3, table footnote.

The examination record shall include the position, the echo height, length, depth and type of indication. NDT personnel performing visual inspection of welded joints shall be qualified in accordance with ENVT rd level 2 or equivalent 3 party certification scheme. NS latest revision may be used. Final inspection and NDT of structural steel welds shall not be carried out before 48 h after completion except where PWHT is required.

The defect rate statistics shall be used as a tool in weld quality control.