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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Where necessary, precautions shall be taken to ensure that specified valve seat pressure differentials are not exceeded. The Standard recommends that ass air content should be shown to be insignificant or should be measured, and provides a simple field method in Appendix F. Where leak detection is by correlation of pressure with temperature, the hold period shall be not less than 24 h. A leak test is acceptable if the results of measurements or visual observations of the test section show that the pre-determined acceptance criteria for the test section have been met.
During the hold period of the leak test, changes of temperature that would result in volume changes in a free state will result in pressure changes in the constrained state of a leak test.
Permanent strain of 0. There may be temperature gradients within the water from the pipeline centre and the pipeline inner surface, and there will be temperature variation in the water and the steel along a long section of pipeline and in a pipeline with varying depths of cover.
Where there is any doubt, experimental work should be carried out to determine its suitability. 28885.5 straining takes place for some time, often for several hours in yield tests. Standards may also be withdrawn. Similarly, oxy-cutting may cause either an underestimation or an overestimation.
SCOPE OF ACCREDITATION
Industrial grade gauges 28885.5 following applies to industrial grade gauges: Between 2 h and 8 h, the strength test is considered complete when initial yielding is over. Where measurement of strain is used to check for yielding, strength testing of aboveground very short test sections may be performed without volumetric control. A minimum value of 1.
Procedures and precautions for the safety of the general public, operating personnel and testing personnel, and operating and testing equipment see also Clause 2. The maximum section length can be increased, but not more than doubled, provided the leak test hold time is increased to 48 h. The following equations in this Paragraph G4.
It will be necessary to substitute the appropriate values of the properties of the liquid and the operating conditions in the appropriate equation in Paragraph G4. This Standard was prepared to provide a basis on which approving authorities could assess tests or testing programs.
There is an additional uncertainty due to a possible difference between the measured 22885.5 tip temperature and the actual pipe and water temperatures. Bourdon tube pressure gauges are particularly susceptible to damage from shock loading in transport and in use, and from impurities in the liquid such as sealing tape. No part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher.
The duration of leak tests depends on the method and sensitivity of leak detection methods. The leak test pressure.
A sensitivity of 0. At the end of the test and before commissioning or recommissioning the pipeline, the test section and all associated equipment shall be put into a safe condition.
The name of the pipe manufacturer and the mill test pressure. Records of each verification shall be maintained. The application of correction charts in the field is not permitted.
The offset volume excludes the volume of water added to compress residual air.
AS Pipelines-Gas and liquid petroleum – Field pressure testing_图文_百度文库
The fixed sensitivity of the pressure instrument during testing even if no pressure change is noted ensures that the certainty with which a given leak rate can be determined decreases as the volume of the test section increases, and this imposes a limit on the size of pipe section that can be tested.
At higher pressures, however, the effect may be significant. The Standard requires that the test slope be compared with the theoretical slope before proceeding into the yield range, and provides a method for doing this in Appendix B.
An end-point known as 0.