AS/NZS This joint Australian/New Zealand standard was prepared by joint Technical Committee ME, Petroleum Pipelines. AS/NZS () Revisions AS () has recently been revised and released as AS/NZS () with a number of. AS — Australian Standard. ®. Pipelines—Gas and liquid petroleum. Part 2: Welding. A. S. —. This is a free 10 page.
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Ensure that— i ii c combustible hydrocarbon fluid cannot flow towards the work site; and valves that isolate the work from the source of hydrocarbon fluids do not leak. A B ii Where the 8285.2 diameter of the pipe is not greater than Welds made in accordance with other standards e.
Source to film distance.
The width of the heated band on either side of the centre-line of the weld shall be not less than 75 mm or three times the width of the weld, whichever is the greater.
The most important of these is that because the limits are based on experimentally validated plastic collapse considerations, the welds have to be shown to have adequate toughness in order to ensure that failure does not occur by brittle fracture.
The WELDNET – AS/NZS 2885.2 Review
Welds that comply with the selected criteria of acceptance shall be deemed to comply with this Standard. Before cutting the line pipe with a hot tapping tool, the weld and adjacent material should be leak-tested at a pressure not greater than the current internal pressure of the pipeline. Australian experience, which formed the basis for the edition of this Standard, and the results of recent Australian research work undertaken by the CRC for Welded Structures have also been taken into account see also Preface.
This may be achieved by totally masking all areas of the radiograph, with the exception of a window that is of comparable size with the actual undercut, and comparing the density observed in the same size window of the machined grooves.
The WELDNET – AS/NZS Review – Australian Welding Institute
Because of the potentially hazardous nature of the earthing procedure, the earthing procedure shall be approved. Each combination is to be identified by its complete classification number e.
A welding procedure specification may be presented in any suitable form written or tabularthat suits the needs of the organization responsible for qualification of the welding procedure. Important changes, corrections, and clarifications have been made to the essential variables. For pipe ends of the same nominal thickness, the offset shall not exceed 3 mm for pipe with wall thicknesses xs than 6.
Changes have been made to the application clause to clarify where the Standard is intended to be applied. The welding of fittings may present special difficulties when using typical pipeline welding procedures see Appendix E. It is likely that in most 285.2, because actual 22885.2 conditions will be known and therefore assumptions do not need to be as conservative as in the generalized case used in Tier 2, the criteria of Tier 3 may, subject to satisfactory levels of fracture toughness, permit the acceptance of more severe discontinuities than both Tiers 1 and 2.
Their disposition by repair or removal shall be as directed by the pipeline licensee. Charpy tests 28855.2 mandatory when the criteria for acceptance of girth weld discontinuities is Tier 2 see Clause In order to meet this requirement it may be necessary to investigate and determine the length of discontinuities that appear on the polished plane of the macro test piece. The work return clamp shall make good electrical contact with no evidence of arcing.
Discontinuities ws be evaluated in accordance with Clause Where appropriate, the welding procedure should be an aspect of the investigation. The means zs maintaining work site to mainline valve communication. The size and location of reference reflectors shall be determined for the project after the welding procedure has been established. The supervisor shall be qualified in accordance with Clause In order to permit effective radiography of those welds that are to be radiographed, the height of external weld reinforcement shall be not greater than that specified in Figure Alternatively, wide plate ax or full-scale tests could be used.
The documentation shall include a statement of the qualifications and experience of the welding engineer qs will supervise the welds. Pipeline repair welding shall be continuously supervised.
For the application of previously qualified procedures to existing pipeline systems, the essential variables applicable to the previous qualified procedure may be applied. Burn-off rate is proportional to the heat input, divided by the square of the electrode core wire diameter.
Standards Australia All rights are reserved. Where a test piece has been assessed for soundness by a non-destructive examination, test specimens for tensile tests and bend tests shall be taken from locations that are free from discontinuities. Details of the weld preparations shall be in accordance with those shown in the qualified welding procedure specification.
It should be swabbed if necessary. These safe working procedures shall be approved. Where a gas-shielded arc-welding process is used and winds or draughts could impair the quality of the weld, welding habitats or windshields should be used.
The radiographic density through the weld metal shall not be less than 1. It shall be prepared in accordance with AS The most common test methods that are used to assess fracture toughness in pipeline girth welds are the Charpy test see AS Cleaning after testing The penetrant and 288.2 developer shall be removed after testing. Radiographic method designation see AS Cluster porosity PG aas occurs in any pass except the finish pass shall comply with the criteria in Item a above. The production of documentary evidence showing that the test piece required for the qualification of the welding procedure has been welded, and that the procedure has been qualified.
For example, restrictions with regards to time delay between passes and any change in ax manufacturer are now clearly only applicable to cellulosic MMAW.
A discontinuity known as root slag intrusion, which occurs at the xs of the root bead, is recognized as an intrinsic feature of cellulosic electrode welds in pipelines.