Edition 5 of this NORSOK standard has been necessary due to an extensive change in referenced international standards. In addition new annexes have been included. Some corrections and improvements have also been implemented. NOTE 2: For highly fatigue utilized structures, more severe requirements may apply, and these will be shown on the design drawings.
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Summary of Transition Ray Dalio's Template f PwC Chinese Bankers Su China Macro Economy An J Psychopharmacol. Standards Norway Strandveien 18, P. 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. Annex A, B and F are informative. Annexes C, D, E and G are normative. In addition new annexes have been included. NOTE 1 Lower minimum design temperatures require project specific evaluations.
For highly fatigue utilized structures, more severe requirements may apply, and these will be shown on the design drawings. NOTE 2 2 Normative and informative references The following standards include provisions and guidelines which, through reference in this text, constitute provisions and guidelines of this NORSOK standard. Latest issue of the references shall be used unless otherwise agreed.
Other recognized standards may be used provided it can be shown that they meet the requirements of the referenced standards. Non-destructive testing of welds — Magnetic particle testing. Non-destructive testing of welds — Ultrasonic testing of welded joints. Non-destructive testing of welds — Ultrasonic testing — Testing of welds in austenitic steels and nickel-based alloys Material data sheets for structural steel Design of steel structures Welding and inspection of piping Welding. Rules for approval of welding inspectors 2.
Mn Cr? Si Mn? Cr Ni Mo V? Selection of a better steel quality level in fabrication than the minimum required by the designer shall not lead to more stringent requirements in fabrication. It may also be transferred to and used by a subcontractor, provided the principles of ISO and ISO are implemented and documented. Requirements to components in stainless steel and Ni-alloys are given in Annex G.
The WPQR documentation shall include the material certificates for the base material and filler materials applied in the weld qualification test. If an approval testing have been performed at both a high and a low heat input level all specified mechanical testing to be performed for both high and low heat input , then all intermediate heat inputs are also qualified; b when the steel to be welded has a Pcm?
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 the specified steel quality level.
CTOD testing shall be executed from as welded and PWHT weld assemblies as applicable, covering the following combined conditions: 1 full penetration buttweld with K-, or half V -groove as deemed most representative for the actual fabrication. Assemblies shall be made and tested for the actual combination of steel manufacturer, welding process and welding consumable brand used, except welding consumables used for root passes only, provided these are removed completely by gouging and grinding.
NOTE The changes specified in d and e above need not require re-qualification if HAZ properties for the material to be welded have been documented from the steel manufacturer for relevant thicknesses and heat input ranges. If sufficient documentation from the steel manufacturer is not available, a change of material shall require re-qualification of a reduced number of procedures. 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.
Testing shall be performed in accordance with ISO and the additional requirements given below. The soundness of the weld shall comply with Clause 9. Test laboratories shall have a quality system in compliance with ISO or equivalent. All specimens shall be machined with the notch through the thickness, 2 mm below the surface of the material.
For welds with a joint thickness T?? The test temperature and energy requirements shall comply with Table 2. The fracture shall be located outside the weld metal, i. Three valid test specimens shall be obtained for each test position. CTOD-testing of welds shall be carried out with the fatigue notch tip positioned in the coarse grained region of the heat affected zone and in the weld metal.
For HAZ, determination of the actual location of the fatigue crack tip shall be performed after testing, see EN NOTE Test assemblies may be given hydrogen diffusion treatment prior to testing, and specimens may be precompressed. Other test temperature may be prescribed by the designer. The requirement for minimum CTOD value shall be prescribed by the designer. If not specified, the requirement for minimum CTOD value shall be as for the steel purchase order.
CTOD-testing of weld metal can be omitted if relevant CTOD properties in weld metal have been documented previously in accordance with requirements in this NORSOK standard, provided the requirements for the essential variables are met.
The required fracture toughness level shall be decided in design for joints when steel quality level I and II are required. Testing is normally not requested for structures with plate thickness below 40 mm for SMYS? Welding operators shall be certified according to ISO For welding of single sided acute angled tubular joints with?
The manufacturer shall have an implemented and documented quality system according with ISO The fabricator shall apply a weld numbering system for identification on all shop drawings and as reference in all documentation. Welds in inspection category A and B shall have unique weld number.
The shop drawings shall have enough information to enable correct selection of WPS. The following information shall be used as relevant:? The manufacturer shall appoint a responsible authorized welding coordinator. The responsible welding coordinator may delegate welding coordination activities at fabrications sites to an IWT, see ISO All other personnel who are carrying out one or more welding activities according to ISO , Annex B, are welding coordinators.
Welding inspection shall be performed before, during and after welding according to typical check points listed in Annex F. All inspections shall be reported to the responsible welding coordinator. The inspection frequency shall be sufficient to report weekly quality status during fabrication based on welding inspection reports.
Prior to fabrication start-up, contractor shall implement a system for recording of quality status. Causes for non-conformance shall be immediately investigated and corrective action shall be taken to prevent further occurrence.
C shall be carried out within the deformation range recommended by the steel manufacturer. If the deformation is more than the above given limits, either heat treatment shall be performed, or strain ageing tests shall be carried out according to the following requirements:? C for 1 h;? The notch shall be located within the plastically strained portion of the material, in the part of the cross section which have received the highest strain;?
If forming is performed at temperature above ? The percentage strain due to forming is defined as follows: Percent strain? If no other requirements are specified, a tapering of should be used. Holes shall be made by machine drilling. Crevices and areas which become inaccessible after fabrication or assembly shall be sealed off from the outside atmosphere. Seal welds shall have a throat thickness of at least 3 mm. Where steel items shall be hot dip galvanised, hollow sections shall be ventilated.
Temporary cut outs shall have a corner radius not less than mm. Temporary cut-outs shall be closed by refitting the same or an equivalent plate and employing the same welding, inspection and documentation procedures and requirements that govern the structural part in question.
The base material properties shall satisfy the specified requirements after straightening. Maximum temperature for straightening shall not exceed the temperature limit recommended by the steel manufacturer, but it shall in no case be higher than ? All attachments in the splash zone shall be attached to the structure by using doubler plates.
Buttering shall be welded in accordance with applicable WPS. Tack welds shall normally have a length of minimum mm. For material thickness less or equal to 25 mm, tack length may be minimum 4 x plate thickness. This may be achieved through alternatively :? Except for solid wires such consumables shall be classified by the supplier as extra low hydrogen, i.
For self shielded flux cored wire HDM? Hydrogen testing shall be according to ISO or equivalent. Stricter requirements than given above may be relevant. Prequalification with mock-up structures shall apply if there is a risk for high restraint in welding or erection. Such consumables shall be delivered with EN , type 2. All welding consumables shall be individually marked.
When certification according to Annex C is used, welding consumables except welding fluxes shall be supplied with an inspection certificate type 3. Welding fluxes shall be supplied with a test report EN , type 2. Cutting torches are not allowed for preheating.
C measured at the edge of the groove. C may be used, even if a lower temperature was recorded on the WPQR. The preheat temperatures used during repair welding should be minimum 50? C higher than the preheat used for the original weld.
NORSOK M-101 (Ed. 2011)_Structural Steel Fabrication
Summary of Transition Ray Dalio's Template f PwC Chinese Bankers Su China Macro Economy An J Psychopharmacol. Standards Norway Strandveien 18, P. 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.
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