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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The yield strength may be represented by a material grade, e. Where the outside diameter of the pipe is greater than Criteria of acceptance The maximum hardness in the weld zone shall not exceed HV for non-sour environment, and HV for sour environment.
Both the arc voltage ae welding current have to be measured accurately with voltage measured between the electrode holder or contact tube and the work piece.
If the density in the parent metal falls within the range specified above but the required minimum for the weld metal is ad met, then the weld reinforcement shall be ground in the regions of insufficient density and the radiograph s shall be retaken so that the above requirements are met.
The weld preparation is in accordance with Figure Copies of the legislation may be obtained from the State Law Publisher. The pipe used for the reference standard shall be traceable to the rolling mill, steel manufacturer, steel grade and be of the same nominal dimensions as the pipe being tested. Where the terminology and abbreviations used in AS do not adequately describe some of the discontinuities found in pipeline welds, additional descriptive abbreviations may be required e.
Shallow crater cracks or star cracks are located at the stopping point of weld beads and are the result of weld metal contractions during solidification. The methods and the requirements for qualifying welding procedures have been clarified. Destructive tests may be used to supplement non-destructive examination.
Standards Australia 2 3 4 5 6 www. If this is necessary it shall be done by reference to the results of the non-destructive examination. Where the wall thickness is between 3. Description You must comply with this standard if you intend to weld pipelines that carry gas and liquid petroleum.
Bonding cables should be installed prior to cutting, to effectively bypass any current that may be flowing in the pipeline especially if the methods of cutting employed are not expected to cause ignition.
Tier 1, 2, 3. The welding preheat, heat input or burn-off rate shall be at or near the lower end of the range to be qualified. Weld passes in a butt weld shall be identified as shown in Figure 5.
A corrosion inhibitor may be applied. The width of an IN indication exceeds 3 mm.
An arc burn that results from an inadvertent arc strike shall be removed in accordance with Clause 24 or CTOD tests are only mandatory when the criteria for acceptance of girth weld discontinuities is Tier 2 see Clause The shape of weld reinforcement may limit interpretation. Qualified by separate tests in each position or a combination of 2G and 5G test welds. A B ii Where the outside diameter of the pipe is not greater than Automatic welding does not include semi-automatic welding, which is qualified as Category 1.
For this reason the Tier 2 and Tier 3 lower limit multiplier for thickness range is more restrictive than that for Tier 1.
The dimensions of the weld shall comply with those shown in the welding procedure specification.
The WELDNET – AS/NZS Review – Australian Welding Institute
The aggregate length of PG in any continuous mm length of weld exceeds 13 mm. Contact us via email at mail standards.
Code of Practice A code of practice is a set of rules which details how people in a certain industry should behave. Reports A test certificate shall be issued.
The WELDNET – AS/NZS 2885.2 Review
The following are represented on Committee ME The time lapse between starting the root pass and starting the hot pass shall not exceed 8 min. For general enquiries please contact the department using the telephone numbers or email addresses on our contact us page.
The gas pressure is controlled to a slight positive pressure of approximately Pa gauge. Unless otherwise specified in the design, this Zs does not specify minimum levels of weld reinforcement beyond filling the joint flush with the parent metal.
The timing of NDE is not restricted by this Standard, except for— a b weld procedure qualification tests see Clause 6.
Where the gas is toxic, adequate precautions are taken to protect all personnel including the public. 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 The minimum absorbed energy for individual specimens shall be 30 J.
Dimensions The dimensions of the comparator shim shall be as shown in Figure It should be noted that highly susceptible materials may fail in less severe environments. The supervisor aas be qualified in accordance with Clause The size and location of reference reflectors aa be determined for the project after the welding procedure has been established.
Gas supply network safety and network supply standards
At low heat input, the heat sink effect ass the flowing fluid and the usually thick enclosing sleeve may promote hydrogen cold cracking, and preheat is usually necessary.
Fillet welds shall not be radiographed. This requirement was inadvertently omitted from the edition. The rotational speed of the test unit shall be the same as for production testing. No part of this work may be reproduced ax copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher.
Tier 2858.2, however, permits increased defect limits based on demonstrated mechanical properties, i. The preferred technique of radiographic examination of welds in pipelines is that of using an internal orthogonal x-ray radiographic crawler as, inter alia, the detectability of imperfections including cracks is superior to that obtained using high-energy gamma rays or double-wall exposure techniques.
Production welds that do not comply with the selected criteria shall be repaired see Clause 23 or 24 or cut out see Clause If pipe is procured for a project where there are a number of suppliers or manufacturing routes or different material grades 2885., the shear wave acoustic velocity in the longitudinal and transverse directions shall be determined for each supplier, manufacturing route and grade.
A a 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.