Australian New Zealand Standard AS / NZS Pipelines – Gas and Liquid Petroleum – Field Pressure Testing – Western Australia. AS – , Field Pressure Testing, Revision committed formed, Expected AS – , Safety Management Studies, With. AS/NZS Accessed by CITIC PACIFIC MINING PTY LTD on 03 Dec AS/NZS Australian/New Zealand Standard?.
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History of the Newark Pipelines—Gas and liquid petroleum Part 28885.5 It was published on 4 April The following interests are represented on Committee ME To maintain their currency, all Standards are periodically reviewed, and new editions are published.
Between editions, amendments may be issued.
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This Standard was issued in draft form for comment as No part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, 28885.5 photocopying, without the written permission of the publisher. The objective of this Standard is to set out methods for the determination qs the strength and the leak-tightness of a pipeline test section. It may also be ss for testing other pipelines including pipelines designed to, or operated to, AS Hydrostatic testing of a pipeline is usually 22885.5 out by testing a number ass isolated test sections.
Hydrostatic testing is used to establish— a b the strength and leak tightness of a test section; and the pressure strength of a pipeline for the purposes of determining or confirming the maximum allowable operating pressure of the pipeline. For information on the history and basis of the Standard, see Appendix A. It may also be applicable to high pressure steel pipelines designed and constructed to national Standards of other countries.
This Standard may be applied 2885.5 pretesting of pipe ws components and for testing sections of pipe separate from the field test see Clause 4.
The test may also be used to— a b measure certain mechanical properties of the test section or to relieve or reduce residual stress in the test section; and determine the maximum allowable operating pressure MAOP of a pipeline. AS Bourdon tube pressure and vacuum gauges Design and construction Part 3: The added volume per unit pressure rise at this end point is double that of the obviously elastic portion of the plot after the effects of residual air are overcome.
An offset volume of 0. The offset volume excludes the volume of water added to compress residual air. The pressure strength is measured or calculated at the highest point in the test section. For the purposes of this Standard, and particularly for purposes aas verification, the transducer includes the sensor, signal conditioning, indicating, and recording apparatus integral to its use.
Units shall be converted to SI units 22885.5 any rounding. For examples of interpretation of specified values in accordance with the rounding method, see AS This Section defines the minimum requirements for accuracy, sensitivity and repeatability of test equipment and the practices to be aas to ensure that readings of test instruments reflect test section parameters and avoid spurious influences. Indicated readings from verified instruments and equipment shall be used without correction. A sensitivity of 0.
Where the test pressure is to be used to determine the MAOP, the accuracy of the pressure-measuring-device shall be 0. Pressure gauges Test grade qs industrial grade Bourdon tube pressure 2885.5 shall comply with AS Industrial grade gauges The following applies to industrial grade gauges: Industrial grade gauges shall be verified against a test grade gauge or deadweight tester or equivalent pressure calibrator.
Records of verification tests shall be maintained. Sensitivity better than 0. Leak test If required, pipe wall temperature measurement devices used for test evaluation shall meet the following requirements see Clause 4. Such pipe wall temperature-measuring devices for leak test evaluation are used to determine temperature changes on pipe walls where in ground temperatures may show diurnal changes of approximately 0. The accuracy requirement is sufficient to determine the temperature-pressure response at the prevailing average pipe temperature.
An ice-point verification is sufficient. Records of each verification shall be maintained. Precautions qs be taken to protect the equipment against adverse effects such as weather and other threats. Bourdon tube pressure gauges are particularly susceptible aa damage from shock loading in transport and in use, and from impurities in the liquid such as sealing tape. More than one pressuremeasuring device shall be used.
Any difference between the indication of the pressuremeasuring devices shall be monitored, and shall be investigated. Temperature-measuring devices shall be selected to satisfy the requirements of this document.
Temperature-measurement points shall be carefully selected to ensure that the measurement is relevant to the relationship being measured. The sensing element and, where necessary, the instrument shall be protected against the effects of ambient and extraneous temperature sources and electrical interference. 22885.5 temperature measuring points may be located on the surface of the pipe, or the surface of the pipe coating. Where there is any doubt, experimental work should be carried out to determine its suitability.
Unstable liquids shall not be used. Liquefied petroleum gas or any other highvapour pressure liquid that is deemed not to be a suitable liquid shall not be used. The test liquid may contain corrosion inhibitors or other appropriate additives.
The test liquid shall be selected after consideration 8285.5 the consequences of a rupture of the test section or escape of the liquid during the test, with regard to the effects such an incident would have on the general public, operating and testing personnel, testing and operating equipment, and the environment.
AS Pipelines-Gas and liquid petroleum – Field pressure testing_图文_百度文库
The method of disposal of the test liquid shall be considered in the selection 288.5 the test liquid, and relevant environment protection requirements shall be established. Adequate warning signs shall be displayed along the test section. Except as provided in Clause 2. A guide to the selection and design of test sections is given in Appendix I.
SCOPE OF ACCREDITATION
The test program shall take into account an assessment of stresses in the pipe wall of the test section resulting from mass of the test liquid, end restraints, any additional loading from other structures, and any other significant loadings. Where a combination of hoop stress, longitudinal stress and radial stress occurs, the cumulative effect of these shall be determined from the maximum shear stress Tresca theory. The test program shall include details of the following: The elevations of the measuring points and the highest point and lowest point of the test section.
Test sections should be chosen in accordance with Appendix I. The specification and grade of the pipes in the test section, the mill test pressure and the name s of the manufacturer s. Test pressure ratings of valves, components, connections, and appurtenances in the test section.
Ratings may be taken from specifications. Consideration is to be given to the effect of pressure on all components in the test section, e. An assessment of the possibility of longitudinal or circumferential expansion due to pressure causing damage to the pipe coating. Where not water, the type of test liquid to be used and its— i ii density; cubic thermal expansion coefficient; and iii compressibility.
The minimum strength test pressure and leak test pressure at the highest and lowest points of the test section, and their relationship to the pressure at the measuring point. For an illustration of the techniques and calculations that may be required in field pressure testing, see Appendix C.
The values in Table 5. The altered values shall be justified and approved. For guidance on this selection of end-point see Appendix D. Procedures for cleaning and filling the test section. Procedures for pressurizing the test section. The location of pressurization injection points. Procedures and precautions for the disposal of the test liquid. Procedures and precautions for the safety of the general public, operating personnel and testing personnel, and operating and testing equipment see also Clause 2.
These should include a warning about excess pressure being developed due to solar radiation. The precautions should include the provision of appropriate safety warning signs. The value of combined stresses, as determined in accordance with AS The value of relevant and significant external loads.
The limit of residual air. All valves and equipment that are not suitable shall be isolated or removed. Where necessary, precautions shall be taken to ensure that specified valve seat pressure differentials are not exceeded. Temporary and permanent connections between the test section and all associated test equipment shall be adequately designed and supported.
Where the test liquid in the test section may experience thermal expansion, provision shall be made for the relief of the resulting increase in pressure.
Where the test liquid will be subject to temperatures near freezing, precautions shall be taken to protect the equipment and the test section. Tests for which the maximum pressure has the potential to result in yielding of any pipe under test are required to be conducted in a manner that monitors the amount of straining during the test. Tests that are assessed as not likely to result in yielding of pipe may be conducted to a predetermined pressure end point.
This is called a pressure-controlled test. The duration of strength tests is defined to verify the strength of the test section by allowing time for any near critical defects to grow to failure. The duration of leak tests depends on the method and sensitivity of leak detection methods.