The documents are available free of charge in PDF format. DNVGL-OS-C Offshore standard, DNVGL-OS-C – Edition July Page 3. Fabrication. The electronic pdf version of this document, available free of charge This document supersedes the July edition of DNVGL-OS-C Changes in this. The electronic pdf version of this document found through resgoderfita.ml is the officially binding version Offshore Standard DNV-OS-C, October
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OFFSHORE STANDARD DNV-OS-C Fabrication and Testing of Offshore Structures OCTOBER The electronic pdf version of this. The standard has been written for general world-wide application. Governmental regulations include requirements in excess of the provisions by this. OFFSHORE STANDARD DNVGL-OS-C Edition July Fabrication and testing of offshore structures The electronic pdf version of this document found.
Shall be performed by folding the upright plate onto the through plate.
Evaluation is to concentrate on cracks, porosities and pores, inclusions, lack of fusion and incomplete penetration. Imperfections that are detected shall be assessed in accordance with ISO quality level B.
The qualified ranges are given in [3. When one or more variations outside the qualification ranges variables occur, the welding procedure qualification shall be considered invalid, and the WPS shall be re-specified and re-qualified.
DNV-OS-C401: Fabrication and Testing of Offshore Structures
Guidance note: Note that a qualified procedure is always based on a welding procedure test WPQT and that acceptance of a WPS based on a welding procedure test is only required for the type of services listed in [6. The following changes shall lead to a new qualification: a In general, significant change of material properties which will obviously affect the weldability and mechanical properties.
Guidance note: For materials with C 0. Change from delivery condition TM to other delivery conditions may, however, be accepted provided the carbon equivalent of the qualified TM-steel is same or higher than the steel to be covered.
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This change may, however, be accepted provided the carbon equivalent of the qualified improved weldability steel is same or higher than the steel to be covered.
For each traverse a minimum of 3 indentations shall be made in the weld, HAZ both sides and parent metal both sides.
For HAZ the first indentation shall be placed as close to the fusion line as possible. For double sided welds, for fillet and T-butt welds one additional row of indentations shall be made through the root area. Acceptance criteria: For material grades up to and including VL , a maximum hardness limit of HV10 shall be met.
For single run fillet welds a maximum hardness limit of HV10 shall be met. Four sets of three specimens each shall be sampled 2 mm below the surface of the parent material and transverse to the weld. For material thicknesses below 6 mm, impact testing is not required unless specifically required.
The V-notch shall be perpendicular to the plate surface. Where multi-process welding is qualified in a single test piece, impact test specimens shall be taken from the weld metal and HAZ that include each process.
FABRICATION AND TESTING OF
This does not apply to the process and consumables used to make the first weld run or root deposit of a multipass weld. The obtained minimum and average value for absorbed energy in WM, FL and HAZ shall meet the transverse direction requirements for the base material.
For grades of improved weldability see DNVGL-OS-B , the Charpy V-notch test temperature and the average value for absorbed energy in weld metal, fusion line and HAZ shall be the same as required for the base material of the comparable normal weldability grade in transverse direction.
The results obtained shall be combined with the original results to form a new average, which, for acceptance, shall be not less than the required value.
In the same way, the tensile strength to be obtained on the welded assembly shall be in agreement with the requirements relating to the plate steel having the lower strength.
As an example the test temperature, impact energy and tensile strength for the butt welded joints given in Figure 3 are those required for the plate of grade D in the left assembly and for the plate of grade E in the right assembly.
Acceptance criteria: The soundness of the weld shall comply, unless otherwise specified, with EN ISO quality level B for ferrous materials. Figure 5 Sampling of test specimens in pipes 3. T- or Y- and K- configurations, shall cover a weld length of minimum mm see Figure 6.Acceptance criteria: Cracks and lack of fusion are not accepted.
Edition July 2015
For hardness testing, see [3. When one or more variations outside the qualification ranges variables occur, the welding procedure qualification shall be considered invalid, and the WPS shall be re-specified and re-qualified. As an example the test temperature, impact energy and tensile strength for the butt welded joints given in Fig.
With this certificate we are authorized to provide a CE declaration of conformity on all our fabricated structural steel. Location of fracture WM or BM , and tensile strength shall be reported.
As far as possible the plates shall be of a sufficient size to ensure a reasonable heat distribution.
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