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12293:2000
BS 2782-11: Method 1123T:2000
The European Standard EN 12293:1999 has the status of a
British Standard
ICS 23.040.20; 23.040.45
NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW
Plastics piping
systems Ð
Thermoplastics pipes
and fittings for hot and
cold water Ð Test
method for the
resistance of mounted
assemblies to
temperature cycling
Trang 2This British Standard, having
been prepared under the
direction of the Sector
Committee for Materials and
Chemicals, was published under
the authority of the Standards
Committee and comes into effect
on 15 May 2000
BSI 05-2000
ISBN 0 580 34928 4
BS EN 12293:2000
National foreword
This British Standard is the official English language version of EN 12293:2000 The UK participation in its preparation was entrusted to Technical Committee PRI/61, Plastics piping systems and components, which has the responsibility to:
Ð aid enquirers to understand the text;
Ð present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed;
Ð monitor related international and European developments and promulgate them in the UK
A list of organizations represented on this committee can be obtained on request to its secretary
The responsible UK committee gives the following advice concerning the use and interpretation of this British Standard
a) In 3.2 a) and in 3.3 reference is made to ªwater velocityº This is residual text
from the draft standard which should have been changed to reflect redrafting of
3.1 a), of 3.3 and of clause 7 to to remove references to water velocity and/or to
relate instead to the specified limits for the temperature variation throughout the
test piece For consistency with the wording of 3.1 a), of 3.3 and of 6.2 in
EN 12293:1999, it is considered that in 3.2 a) the words ª(see 6.2)º should now
be read as ª(see 3.3)º.
b) In 3.8, the tensioning device is required to stress the pipe to the stress given in
the referring standard At the time of going to print, neither the referring standards nor this standard provide enough detail to calculate the force needed
In principle, this force could be based on actual pipe dimensions (if so, the detail
is required as to how and where it is to be measured) or taken from the referring standard (if this is the case then the standard might choose to require use of nominal or of specified minimum or maximum valves for the thickness and likewise for the diameter; differing results will be obtained depending upon the options specified) If a stress or force has to be quantified, then this standard needs details of the equation to be used relative to specific actual or nominal dimensions of the pipe
The equation could be based on either type of dimension, taking either worst-case
or mid-tolerance values
Amendments issued since publication
Trang 3BS EN 12293:2000
In the absence of any specific requirements in the standard or spcification making reference to this standard, the responsible UK committee recommends that 3.8 is read as though worded as follows
ª3.8 Tensioning device, capable of applying the force, Fi, necessary to achieve
the required initial tensile stress (see 5.3) when the force is determined using the
following equation:
Fi= 0,25π[(dem,max.)22 {dem,max 2 2(emin.+ te)}2] (1) where
dem,max.is the maximum mean outside diameter specified in the referrring standard
emin.is the minimum wall thickness specified in the referring standard
teis the maximum positive tolerance specified for the wall thickness in the referring standard.º
and in 5.3, following ªreferring standardº insert º(see 3.8).
c) In clause 4, item a) requires a minimum of three pre-stressed pipes for branch
A as shown in Figure 1 The stress conditions during the test may be significantly affected by the number of joints in that branch if any movement is possible within each joint UK experience indicates that there is some permanent slip at each pipe socket interface during the first cycle This may be as little as 0,5 mm If there are six interfaces on the stressed length (one at each end of three pipes) then there may be at least 3 mm permanent set If however 10 straight
double-socket connectors are used there would be 20 pipe/socket interfaces and hence at least 10 mm permanent set This would make a significant difference to the stress in the pipe for the duration of the test The UK committee recommends therefore that the number of pipes in branch A should not be more than five, and should preferably be just three
Cross-references
The British Standards which implement international or European publications
referred to in this document may be found in the BSI Standards Catalogue under the
section entitled ªInternational Standards Correspondence Indexº, or by using the
ªFindº facility of the BSI Standards Electronic Catalogue
WARNING This British Standard, which is identical with EN 12293:1999, does not
necessarily detail all the precautions necessary to meet the requirements of the
Health and Safety at Work etc Act 1974 Attention should be paid to any appropriate
safety precautions and the method should be operated only by trained personnel
A British Standard does not purport to include all the necessary provisions of a
contract Users of British Standards are responsible for their correct application
Compliance with a British Standard does not of itself confer immunity
from legal obligations.
Summary of pages
This document comprises a front cover, an inside front cover, pages i and ii, the
EN title page, pages 2 to 6, an inside back cover and a back cover
The BSI copyright notice displayed in this document indicates when the document
was last issued
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