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IS0
INTERNATIONAL ORGAN IZATl O N FOR STAND A RDlZATl O N
IS0 RECOMMENDATION
R 392
ASBESTOS-CEMENT PIPE FITTINGS
FOR BUILDING AND SANITARY PURPOSES
1st ED IT1 O N
November 1964
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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 ISO.
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 392, Asbestos-cement pipe ,fittings for building anil
sanitary purposes, 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).
Work on this question Gy the Technical Committee began in 1956 and led, in 1963,
to the adoption of a Draft IS0 Recommendation.
In December 1963, this Draft IS0 Recommendation (No. 690) was circulated to all
the IS0 Member Bodies for enquiry. It was approved, subject to a few modifications of
an editorial nature, by the following Member Bodies:
Australia Israel
Republic of South Africa
Austria Italy Romania
Belgium Japan Spain
Colombia Lebanon Sweden
Denmark Morocco Switzerland
Finland
Netherlands Turkey
France New Zealand U.A.R.
Germany Norway United Kingdom
Greece Peru U.S.A.
Hungary Poland
U.S.S.R.
Ireland Portugal Venezuela
Yugoslavia.
Two Member Bodies opposed the approval of the Draft
Brazil, Mexico.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, which decided, in November 1964, to accept it as an IS0 RECOMMEND-
ATION.
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ISO/R 392 . 1964 (E)
CONTENTS
Pages
1 . Scope .
....... ..... 4
2 . Requirements . 4
2.1 Composition . 4
2.2 Types . 4
2.3 General appearance and finish . 4
2.4 Characteristics . 4
.
2.4.1 Geometrical characteristics . 4
2.4.1.1 Nominal diameter . 4
2.4.1.2 Thicknesses . 5
2.4.1.3 Other dimensions . 5
2.4.1.4 Tolerances on the dimensions . 6
2.4.2 Physical characteristics . 6
2.5 Tests . 6
2.5.1 Internal hydraulic pressure tightness test . 6
2.6 Marking . 7
3 . Sampling. inspection and acceptance . 7
3.1 Inspection of each item of the consignment . 7
3.2 Inspection by sampling . 7
.
Appendix A . Testing . 9
Appendix B . Extracts of IS0 Recommendation R 390 " Sampling and Inspection
of Asbestos-Cement Products " . 11
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ISO/R 392 - 1964 (E)
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IS0 Recommendation R 392 November 1964
ASBESTOS-CEMENT PIPE FITTINGS
FOR BUILDING AND SANITARY PURPOSES
1. SCOPE
This Recommendation appiies to asbestos-cement pipe fittings used in building, such as
rainwater, sanitary and sewer connections.
It defines certain conditions of manufacture, dimensions and acceptance tests for these
products.
2. REQUlREMENTS
2.1 Composition
The fittings are made from a close and homogeneous mixture essentially consisting
of a suitable inorganic hydraulic binder, asbestos fibre and water, excluding any
materials liable to cause ultimate deterioration in the quality of the fittings.
2.2 Types
The fittings may be of two types:
- for pipes not used under pressure,
- A - light
- B - heavy - for pipes which may be subject to accidental pressure in service.
2.3 General appearance and finish
The interior surface of the fittings should be regular and as smooth as possible.
The fittings of type B may be coated at least on the interior with a suitable coating
which should comply with the requirements of the national standards of the producing
country.
2.4 Characteristics
2.4.1 Geometrical characteristics
2.4.1.1 NOMINAL DIAMETER
The nominal diameter of the fittings corresponds to the internal diameter
(bore), tolerances not being taken into account.
1 This Recommendation also applies to autoclaved fittings when the binder is partially replaced by ground silica.
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ISO/R 392 - 1964 (E)
The series of the nominal diameters is as follows
Millimetres 1 Inches approximately
i 2
50
l
, 2%
60
80 3
~ 4
100
5
125
6
150
200 8
~
250 10
12
300
I 16
400
500 ~ 20 or 21
When national standards provide for other diameters, these should be chosen
from preferred numbers of the R 10 series.
2.4.1.2 THICKNESSES
The nominal thicknesses of the fittings should conform to those in the national
standards of the producing country or, failing this, should be as specified in
the manufacturer’s catalogues.
The actual thicknesses should however be not less than the following :
DIMENSIONS IN MILLIMETRES
Nominal diameter 1 Thickness
I
50 6
60 ~ 6
7
80
1 O0 7
7
125
8
150
200 8
250 10
300 10
11
400
12
500
2.4.1.3 OTHER DIMENSIONS
The other nominal dimensions should conform to those in the national stand-
ards of the producing country or, failing this, should be as specified in the
manufacturers’ catalogues.
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a The manufacturers’ catalogues should state the dimensions which they normally keep in stock.
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ISO/R 392 - 1964 (E)
2.4.1.4 TOLERANCES ON THE DIMENSIONS
The tolerances on the dimensions measured in the jointing space (socket and
plain end) are as follows:
(a) on the internal diameter of plain ends and sockets (tolerance oj ovality)
The diametral variation O as defined by the ratio of the actual diameter Dr
(maximum or minimum bore of fittings or sockets measured over a given
section) and of the nominal diameter Dt (bore of fittings or sockets)
expressed by the formula :
should lie within the following limits according to the nominal diameters:
for diameters under 80 inm 0.93 -1.04
for diameters from 80 to 150 mm 0.95 -1.03
for diameters from 200 to 300 mm 0.97 -1.02
for diameters from 400 to 500 mm 0.985-1.015.
(h) on the nominal thicknesses
Upper deviation : free
Lower deviation: - 1 mm.
2.4.2 Physical characteristicss
Tested as provided for in 2.5.1 (optional test, carried out only on certain fittings),
the fittings should not indicate any fissure, loss or visible sweating on their outside
surface.
2.5 Tests
The acceptance tests should be carried out on fittings of type B in their condition
for delivery conforming to that of the order, whether coated or uncoated.
Optional test at purchaser’s request
Tightness test on certain fittings of type B (method as defined in 2.5.1, number of
tests as indicated in the extract of the table in Appendix B).
2.5.1 Internal hydraulic pressure tightness test
In view of the difficulty of this test, it should be carried out only on such fittings
as agreed between the manufacturer and the purchaser at the time of placing
the order. This agreement refers not only to the nature of the fittings, but also
to the apparatus required for this test.
This test is, as a rule, limited to diameters not exceeding 150 mm for installations
of type B.
The fittings are placed on a hydraulic press, the tightness of the ends being ensured
by a device avoiding as far as possible any axial compression of the fittings. The
internal hydraulic pressure is measured by a pressure gauge calibrated to give
accurate readings.
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ISO/R 392 - 1964 (E)
The internal hydraulic pressure is raised gradually to 2.5 kgf/cm2. This pressure
is maintained for at least 30 seconds to check that there is no fissure, loss or visible
sweating on the outside surface of the fittings.
2.6 Marking
The fittings should be marked legibly and indelibly so as to show:
- the origin of manufacture,
- the date of manufacture,
- the type (if necessary).
The method of marking should conform to that in the national standards of the pro-
ducing country.
3. SAMPLING, INSPECTION AND ACCEPTANCE
Enquiries and orders should specify whether the consignment is to be delivered with or
without acceptance tests. Failing this, it is presumed to be with acceptance tests if agree-
ments on the date of the tests have been made between the manufacturer and the purchaser.
Otherwise, the consignment is presumed to be without acceptance tests.
3.1 Inspection of each item
...