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Ref. No.: IS01 R 160 - 1960 (E)
IS0
I NT ERN AT1 ON AL O RG A N 12 AT1 O N FO R STA N D A RD I Z AT1 ON
IS0 RECOMMENDATION
R 160
ASBESTOS CEMENT PRESSURE PIPES
1st EDITION
June 1960
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of JSO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 160, Asbestos Cement Pressure Pipes, was drawn up
by Technical Committee ISO/TC 77, Products in Asbestos Cement, the Secretariat of which
is held by the Association Suisse de Normalisation (SNV).
The ISO/TC 77 Secretariat prepared the first draft proposal, which it circulated, in
July 1952, to the Members of the Technical Committee. In the light of the results of this
consultation, the Secretariat set up a second draft proposal, which was discussed during
the first meeting of lSO/TC 77, held in Zurich, in May 1954. Pursuant to decisions adopted
during that meeting, the Secretariat prepared a third draft proposal, which was circulated
in December 1954.
4
The observations sent in by various Members of the Technical Committee induced
the ISO/TC 77 Secretariat to put forward a fourth draft proposal, which the Technical
Committee accepted by correspondence as a Draft IS0 Recommendation, in June 1956.
This Draft IS0 Recommendation (No. 149) was submitted on 31 October 1956 to all
the IS0 Member Bodies for enquiry. The results of this consultation having been deemed
unsatisfactory, the Technical Committee presented a second Draft IS0 Recommendation,
which was submitted to all the IS0 Member Bodies on 26 June 1959, and which was
approved, subject to a few editorial modifications, by the following 26 Member Bodies :
Australia Ireland Romania
Austria Israel Spain
Belgium Italy Sweden
Burma Japan Switzerland
Chile Netherlands Union of
New Zealand South Africa
Czechoslovakia
Denmark Norway United Kingdom
France Poland U.S.S.R.
Germany Portugal Yugoslavia
Three Member Bodies opposed the approval of the Draft :
Brazil India Mexico
The Draft IS0 Recommendation was then submitted to the IS0 Council, which
decided, during its meeting of June 1960, to accept it as an IS0 RECOMMENDATION.
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ISO/R 160 . 1960 (E)
CONTENTS
I . Purpose and scope . 4
2.Pipes . 4
2.1 Composition . 4
2.2 Finish . 4
2.3 Marking . 4
2.4 Classification and dimensions . 4
2.4.1 Classification . 4
2.4.2 Noniinal diameters . 5
............................
2.4.3 Thickness 5
.............................
2.4.4 Length 5
.................... 5
2.5 Tolerances on the dimensions
2.5.1 Tolerances on the external diameter at finished ends .
5
2.5.2 Tolerances on the internal diameter (bore) (tolerances of ovality) .
6
2.5.3 Tolerances on the thickness of the wall . 6
2.5.4 Tolerances on the nominal length .
6
2.5.5 Tolerances on the straightness . 6
2.6 Tests . 7
2.6.1 Internal hydraulic pressure tightness test . 7
2.6.2 Internal hydraulic pressure bursting test . 7
2.6.3 Transverse crushing test . 8
2.6.4 Longitudinal bending test . 8
.................................
3 . Joints 9
3.1 Jointing .
9
...........................
3.2 Jointing rings 9
3.3 Parts of the joints .
9
...........................
3.4 Dimensions 10
.............................
3.5 Tolerances 10
3.6 Internal hydraulic pressure tightness test . 10
............................
4 . Acceptance tests 10
4.1 Checking on each item of the consignment . IO
4.1.1 Finish-Marking-Dimensions . 10
4.1.2 Length-Delivery tolerances . 10
4.1.3 'Internal hydraulic pressure tightness test . IO
4.2 Checking on samples . I(!
.
............................
4.2.1 Batching 10
............................
4.2.2 Sampling 10
4.2.3
Internal hydraulic pressure tightness test . il
4.3 Carrying out of tests . 11
4.4 Access to the works . II
...........................
4.5 Costs of testing 11
4.6 Period for testing . II
................
5 . Acceptance or rejection of the consignment 11
5.! Checking on each item of the consignment . 11
5.2 Checking on samples .
11
5.3 Manufacturer's certificate . 11
5.3.1 Orders with acceptance tests . 11
5.3.2 Orders without acceptance tests .
12
...........................
6 . Drafting of orders
12
6.1 Fluid conveyed . 12
...............................
6.2 Class 12
..............................
6.3 Length 12
.............................
6.4 Handling 12
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ISO/R 160 - 19W.(E)
IS0 Recommendation R 160 June 1960
ASBESTOS CEMENT PRESSURE PIPES
1. PURPOSE AND SCOPE
This IS0 Recommendation applies to pipes and joints in asbestos cement intended for
use under pressure.
It specifies certain conditions of manufacture, the classification, dimensions and acceptance
tests applicable to these products.
2. PIPES
2.1 Composition
Pipes should be made from a close and homogeneous mixture essentially consisting
of cement, conforming to the national standards of the producing country, asbestos
fibre and water, and excluding material liable to cause ultimate deterioration in the
quality of the pipes.
2.2 Finish
The interior surface of the pipes should be regular and smooth.
Since pipes are to be laid with rubber ring joints, the surface on which the rings rest
should satisfy the tolerances for the exterior diameters, set out in clause 2.5. I, for a
sufficient length to suit the type of joint adopted.
2.3 Marking
Pipes should be marked legibly and indelibly as follows:
Manufacturer's mark,
Date of manufacture,
Nominal diameter,
Class.
The method of marking should conform to the national standards of the producing
country.
2.4 Classification and dimensions
2.4.1 Classification. Pipes are classed according to the tightness test pressure. Either
of the following series of classes * may be chosen:
Classes: Series I Classes: Series II
I
kgf/crnZ Feet head
Feet head kgf/cmD
(approximately)
(approximately)
200 6 5 165
400 12
10 3 30
600 18 15 495
800 24 20 660
25 825
The choice of the class of the pipes is determined by the purchaser's engineer, who alone is qualified to judge the conditions of
laying and using the pipes. Nevertheless, it is recommended that a class be selected such that the working pressure does not
exceed half the tightness test pressure (see clause 2.6.1) given for that class.
I
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ISO/R 180 - 1960 (E)
2.4.2 Nominal diameters. The nominal diameter of asbestos cement pipes corresponds
to the internal diameter (bore), tolerances not being taken into account.
The series of nominal diameters is given below. The dimensions in millimetres and
in inches are considered to be “Corresponding values”, although they are only
Inches Inches
Millimetres
Millimetres
(approximately) (approximately)
I
2
50 350 14 or 15
-
60 400 16
80 3 450 18
4
100 500 20 or 21
-
125 600 24
-
150 6 700
-
8 800
200
-
250 10 900
-
300 12 loo0
2.4.3
Thickness. The actual thickness should be at least 8 mm and be such that the tight-
ness test pressure defining the class gives, in relation to the bursting pressure
(see clause 2.6.2), a safety factor of not less than
2 for pipes up to 100 mm diameter,
1.75 for pipes from 125 to 200 mm diameter,
1.5 for pipes of 250 mm diameter and over.
NOTE: The bursting pressure (see clause 2.6.2) should be not less than the working pressure
(equal to a maximum of 50 per cent of the tightness test pressure), multiplied by the coefficients 4,
3.5 and 3 respectively.
2.4.4 Length. The nominal length (length between extremities for pipes with plain ends,
effective length for pipes with sockets) should be not less than
3 m for pipes of nominal diameter of 100 mm or less,
4 m for pipes of nominal diameter greater than 100 mm.
The nominal length should preferably be a multiple of 0.50 m.
2.5 Tolerances on the dimensions
2.5.1 Tolerances on the external diameter at finished ends
DIMENSIONS IN MILLIMETRES
Nominal diameten
Toleraacea
equal to and over equal to and under
I
I
300 f 0.6
50
350 500 f 0.8
600 700 f 1.0
700 loo0 f 1.2
I I I I
NOTE: Should the tightness of certain types of joints necessitate more severe tolerances, these
tolerances should be specified, when ordering, by agreement between the manufacturer and the
purchaser.
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lSO/ R 160 - I980 (E)
2.5.2 Tolerances on the internal diameter (bore) (tolerances of ovality), (optional test).
The regularity of the internal diameter should be checked by means of a sphere or
a disc, of a material unaffected by water, which should pass freely along the pipe.
The disc should be kept perpendicular to the axis of the pipe. The diameter of the
sphere or the disc should be less than the internal diameter of the pipe by the
following value, expressed in millimetres :
2.5 + 0.01 d
d being the internal diameter, in millimetres.
NOTE: In the acceptance conditions it should be made clear that this test will only be applied
on the special request of the purchaser, to which att.ention is called in the title by the mention of
" optional test ".
2.5.3 Tolerances on the thickness of the wall
Nominal thickness
Tolerances
over under or equal to
1
-
10 & 1.5
10 20 c 2.0
20 30 & 2.5
30 - & 3.0
The above tolerances are also subject to the provision that the difference between
any two internal diameters should never be greater than 10 per cent of the nomi-
nal internal diameter.
2.5.3.2 TOLERANCES ON THE BARREL OF THE PIPE. The thickness at any point should be
not less than that laid down by the application of the tolerances given in
clause 2.5.3.1.
NOTE: The wall thickness of a pipe should be no! less than 8 mm after application of the tolerance in
order to comply with clause 2.4.3.
Tolerances on the nominal length
2.5.4
Upper deviation: + 5 mm
for all lengths.
Lower deviation: - 20 mm
2.5.5 Tolerances on the straightness. The deviation j is determined by rolling the pipe under
examination on two parallel runners placed at a distance apart equal to two thirds
of its length /(see Fig. 1 ,page 7). The deviation should not exceed the following values :
DIMENSIONS IN MILLIMETRES
Nominal diameter
Maximum deviation j
equal to or over I equal to or under I
50 60 5.5 1 *
80 200 4.5 I *
500 3.5 I *
250
600 IO00 2.5 I*
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ISO/R 160 - 1960 (E)
I 1 I
Fig. I
2.6 Tests
Any acceptance tests are carried out at the manufacturer’s works on pipes which the
manufacturer guarantees to be sufficiently matured. There are two sorts of tests :
(a) Compulsory tests
1. Internal hydraulic pressure tightness test on all pipes (method as specified in
clause 2.6.1).
2. Internal hydraulic pressure bursting test (method as specified in clause 2.6.2;
number of tests as specified in clause 4.2.2).
(b) Optional tests at purchaser’s request
3. Transverse crushing test (method as specified in clause 2.6.3; number of tests
as specified in clause 4.2.2).
4. Longitudinal bending test (method as specified in clause 2.6.4; number of tests
as specified in clause 4.2.2).
2.6.1 Internal hydraulic pressure tightness test. The pipes are placed in a hydraulic press,
the tightness of the ends being ensured by an appropriate device.
The internal pressure is measured by a pressure gauge calibrated to give accurate
readings. The internal hydraulic pressure is raised gradually until the gauge registers
a figure corresponding to the class. This pressure is maintained for 30 seconds to
check that there is no loss or visible sweating on the outside surface of the pipe.
The test time may be reduced to 10 seconds without modification of the class,
...