SANS 10802-2010 Ductile iron pipelines - Hydrostatic testing after installation《高强度铸铁管道 安装后水压试验》.pdf

1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA

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3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-23898-8 SANS 10802:2010Edition 1ISO 10802:1992Edition 1SOUTH AFRICAN NATIONAL STANDARD Ductile iron pipelines Hydrostatic testing after in

4、stallation This national standard is the identical implementation of ISO 10802:1992 and is adopted with the permission of the International Organization for Standardization. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27

5、12 344 1568 www.sabs.co.za SABS SANS 10802:2010 Edition 1 ISO 10802:1992 Edition 1 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS SC 138C, Water and sanitation Equipment and systems Cast and ductile iron pipes and fittings

6、, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in March 2010. INTERNATIONAL STANDARD ISO 10802 First edition 1992-12-15 Ductile iron pipelines - Hydrostatic testing after installation Canalisa tion

7、s en fon te ductile - Essais hydrostatiques apr b) the availability of suitable water; c) the number of fittings and accessories (e.g. valves, hydrants, etc.) constituting the Pipeline; d) the differente in elevation between different Parts of the Pipeline. 4.1.2 For pressure pipelines, the length o

8、f the test sections shall not exceed 1 500 m unless otheiwise specified. 4.1.3 For non-pressure pipelines, the test section is usually the total length between consecutive manholes or inspection Points. If special arrangements are made to enable testing over only part of the length between manholes

9、and inspection Points, then the length of the test section shall not exceed 1 000 m unless otherwise specified. 1 SANS 10802:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 10802:1992(E) 4.2 Anchoring and closures 5.1 Pressure pipelin

10、es 4.2.1 Pressure pipelines All changes in direction and/or Cross-section of the Pipeline, such as bends, tees, tapers (reducers) and blank flanges, shall be adequately restrained (or an- chored) before testing by means of thrust blocks or restraining (self-anchoring) joints. The design of the restr

11、aining (anchoring) devices shall take due consideration of the test pressure to be ap- plied. Isolation of the test sections shall be achieved by us- ing blank flanges or other types of closures. If, for practical reasons, valves are used as closure pieces, the test pressure shall not exceed the rat

12、ed pressure of the valves. When evaluating the Overall leakage al- Iowance for a test section, due consideration shall be taken of the allowable leakage rate(s) of the valve(s). 4.2.2 Non-pressure pipelines 5.1 .l Preliminary operations 5.1.1.1 After filling and before application of the test pressu

13、re, maintain the test section at the working pressure for a sufficient period of time for it to stabil- ize with respect to line movement under pressure, water absorption by the lining, etc. Inspect visually all exposed joints, fittings, anchorages and closures and repair all defects, after draining

14、 the test section if necessary. 5.1.1.2 When the visual inspection is satisfactory, raise the pressure steadily until the test pressures , specified in 5.1 .1.3 and 5.1 I.4 are attained. 5.1.1.3 The test pressure at the lowest Point of the test section shall be not less than the limit specified in a

15、) or b), whichever is greater. Anchoring of non-pressure pipelines is not usually necessary owing to the low test pressure applied. a) for working pressures less than or equal to 10 bar: l,5 times the working pressure; 4.3 Partial backfilling before testing for working pressures greater than 10 bar:

16、 the working pressure plus 5 bar; Pipelines are normally tested after backfilling. How- ever, when particular conditions necessitate that pressure testing be carried out before completion of backfilling or with the pipe joints accessible for examination, sufficient backfill material shall be placed

17、over the pipe barrel between the joints to prevent movement, and due consideration shall be given to restraining thrust forces during the test. In particular, restrained-joint Systems which derive their stability from the interaction of the pipe and soil should be backfilled Prior to testing. b) the

18、 maximum working pressure. The test pressure shall not exceed - the maximum test pressure specified in the stan- dards applicable to the pipes, fittings, flanges and accessories, or - the design pressure of the restraining or anchoring devices. 4.4 Filling with water Filling should normally be carri

19、ed out at the lowest Point of the section to be tested and at a rate slow enough to ensure that all air is evacuated. 5.1.1.4 The test pressure at the highest Point of the test section shall not be less than the working press- ure at this Point. 5.1.2 Pressure test The Pipeline shall have air-ventin

20、g facilities at all high Points. As a guide, the flow-rate during filling should not exceed 10 % of the design working flow-rate. 5.1.2.1 Falling pressure test Maintain the test pressure constant to + 0,l bar, by pumping if necessary, for a period of at least 1 h. Then disconnect the pump and allow

21、no further water to enter the test section for a period of at least Cement mortar lined pipelines require a period of time after filling (depending on site hygrometric conditions) for absorption by the lining to take place. 5 Test procedure 1 h for DN 1 400 At the end of this period, measure the pre

22、ssure in the test section. 2 SANS 10802:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 10802:1992(E) Determine the water loss either by measuring (to an accuracy of + 5 %) the amount of water it is necess- ary to pump into the test s

23、ection to restore the test pressure to within + 0,l bar, or by restoring the test pressure and meacring the amount of water it is necessary to draw off the test section to produce an equivalent pressure drop. 5.1.2.2 Constant pressure test Maintain the test pressure constant to + 0,l bar, by pumping

24、 if necessary, for a period of at least 1 h. Then maintain the test pressure constant (to + 0,l bar) in the test section by pumping for at least - 1 h for DN 1 400 and mea Sure (to an accuracy of + 5 %) the amount of water used to do so. 5.1.3 Determination of acceptance If the water loss determined

25、 in 5.121 or 5.1.2.2 is greater than the acceptable limit specified in 6.1, the test procedure shall be repeated if necessary until full stabilization of the test section has been achieved. If the test is not successful, locate and repair the de- fects, and repeat the test procedure until the loss i

26、s below the Iimit specified in 6.1, unless otherwise agreed. 5.1.4 Testing of the complete Pipeline After all test sections have been found to be accept- able and have been jointed together, it is rec- ommended that a test be carried out on the complete Pipeline in accordance with 5.1 .l to 5.1.3, a

27、nd that all work which has not been subjected to sectional test- ing be inspected. 5.2 Non-pressure pipelines 52.1 After filling and before application of the test pressure, leave the test section for a sufficient period of time to allow water absorption by the lining. During this period, inspect vi

28、sually all exposed joints, fittings and closures and all defects, after draining the test section if necessary. 5.2.2 Apply the test pressure by filling the upstream man hole. Unless maximum water tightness is essential (see 5.2.3), the test pressure shall not exceed 0,4 bar at the crown of the pipe

29、 adjoining the up- stream manhole; 1 bar at the crown of the pipe adjoining the downstream manhole, unless otherwise specified. 5.2.3 When maximum water tightness is essential, for instance owing to the presence of a high water table, springs or wells, a test pressure of up to 5 bar may be specified

30、. 5.2.4 After a test period of 2 h, determine the water loss by measuring the quantity of water it is necess- ary to add to restore the initial level in the upstream manhole. 5.2.5 If the water loss determined is greater than the acceptable Iimit specified in 6.2, the test pro- cedure shall be repea

31、ted if necessary until full stabil- ization of the test section has been achieved. If the test is not successful, locate and repair the defects, and repeat the test procedure until the loss is below the Iimit specified in 6.2, unless otherwise agreed. 6 Acceptance criteria 6.1 Pressure pipelines The

32、 water loss shall not exceed 0,001 litre/hour/kilometre of pipeline/millimetre of nominal size/bar of static pressure (average head applied to the test section). This corresponds to an acceptable loss of 1 I/h per kilometre of DN 100 Pipeline tested at 10 bar. In cases where the elevation of the Pip

33、eline varies considerably throughout its length, the acceptable loss shall be determined from a weighted average pressure. 6.2 Non-pressure pipelines The water loss shall not exceed 0,l litrelkilometre of pipeline/millimetre of nominal size. However, when a test pressure in excess of 1 bar is specif

34、ied (see 5.2.3), the acceptance criterion is that of pressure pipelines. 3 SANS 10802:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 10802:1992(E) Annex A (informative) Bibliography 1 ISO 2531 :1991, Ductile iron pipes, fittings and

35、accessories for pressure pipelines. 2 ISO 7186: 1983, Ductile iron pipes and accessories for non-pressure Pipe-lines. SANS 10802:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .SABS Standards Division The objective of the SABS Standards D

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