DEUTSCHE NORM August 1999
Polyethylene (PE) pipes DIN
General quality requirements and testing
8075
ICS 23. 040.20 Supersedes
May 1987 edition.
Rohre aus Polyethylen (PE) - PE 63, PE 80, PE 100, PE-HD -
Allgemeine Guteanforderungen, Prufung
In keeping with current practice in standards published by the International Organization for Standardization
(ISO), a comma has been used throughout as the decimal marker.
Contents
Page Page
Foreword ............................... 1 5.4 Long-term hydrostatic pressure
1 Scope ............................... 2 resistance .......................... 7
5.5 Heat reversion ....................... 7
2 Normative references ................. 2
6 Testing .............................. 7
3 Concepts ............................ 2
6.1 Form supplied and surface finish........ 7
3.1 Long-term hydrostatic pressure
6.2 Dimensions ......................... 7
resistance ..........................
6.3 Ovality ............................. 7
3.2 Material designation ..................
6.4 Long-term hydrostatic pressure
3.3 Ovality .............................
resistance........................... 7
4 Material (moulding material) ........... 6.5 Heat reversion ....................... 9
4.1 General ............................. 6.6 Test certificate ...................... 9
4.2 Checking long-term hydrostatic pressure
Appendix A Hydrostatic pressure testing for
resistance ..........................
pipes made from PE-HD .......9
5 Requirements ........................
Appendix B ............................. 10
5.1 Form supplied .......................
5.2 Surface finish ....................... Explanatory notes ....................... 11
5.3 Dimensions and tolerances ............ Other relevant standards ................. 11
Foreword
This standard has been prepared by Technical Committee Prufverfahren fur Rohre of the NormenausschuB
Kunststoffe (Plastics Standards Committee).
Amendments
This standard differs from the May 1987 edition as follows:
a) the material designations have been modified;
b) requirements for resistance to hydrostatic pressure have been modified;
c) service life is now assumed to be 100 years (at temperatures up to 20 °C);
d) testing for ovality has been included.
Previous editions
DIN 8075: 1960-07, 1965-01, 1987-05; DIN 8075-1: 1976-03, 1976-08; DIN 8075-2: 1980-05.
Continued on pages 2 to 11.
Translation by DIN-Sprachendienst.
In case of doubt, the German-language original should be consulted as the authoritative text.
0 No part of this translation may be reproduced without the prior permission of Ref. No. DIN 8075 ;1999-08
DIN Deutsches lnstitut fur Normung e. V., Berlin. English price group 08 Sales No. 0108
Beuth Verlag GmbH, D-10772 Berlin, has the exclusive right of sale for German Standards (D!N-Normen). 03.00
Page 2
DIN 8075 ;1999-08
All dimensions are in mm.
1 Scope
This standard specifies requirements and methods of test for straight seamless pipes of circular cross section
made from type PE 63, PE 80 and PE 100 polyethylene.
Pipes made from high-density polyethylene (PE-HD) (see Appendix A) are suitable for non-pressure applica-
tions and for use as conduits.
Individual requirements specified here may be superseded by technical delivery conditions for particular ap-
plications.
2 Normative references
This standard incorporates, by dated or undated reference, provisions from other publications. These norma-
tive references are cited at the appropriate places in the text, and the titles of the publications are listed below.
For dated references, subsequent amendments to or revisions of any of these publications apply to this
standard only when incorporated in it by amendment or revision. For undated references, the latest edition of
the publication referred to applies.
DIN 323-1 Preferred numbers and preferred number series - Basic, calculated and rounded values
DIN 8074 Polyethylene (PE) pipes - Dimensions
DIN 52612-1 Determination of the thermal conductivity of thermal insulating materials by the guarded
hotplate apparatus - Procedure and evaluation
DIN EN 743 Plastics piping and ducting systems - Thermoplastics pipes - Determination of longitu-
dinal reversion
DIN EN 921 Thermoplastics pipes - Determination of resistance to internal pressure at constant tem-
perature
DIN EN 10204 Inspection documents for metallic products (includes Amendment A 1 :1995)
DIN EN ISO 178 Determination of the flexural properties of plastics (ISO 178 :1993)
DIN EN ISO 12162 Thermoplastics materials for pipes and fittings for pressure applications - Classification
and designation - Overall service (design) coefficient (ISO 12162 :1995)
lSO/TR 9080 :1992 Thermoplastics pipes for the transport of fluids - Methods of extrapolation of hydrostatic
stress rupture data to determine the long-term hydrostatic strength of thermoplastics
pipe materials
IEC 60093 Methods of test for insulating materials for electrical purposes - Volume resistivity and
surface resistivity of solid electrical insulating materials
3 Concepts
3.1 Long -term hydrostatic pressure resistance
The strength of a pipe required to resist an induced internal hydrostatic pressure, in N/mm2, calculated as follows:
d-s (1)
of - p 2s
where
p is the induced hydrostatic pressure;
d is the outside diameter;
S is the wall thickness.
3.2 Material designation
Designation of polyethylene moulding materials, based on the minimum required strength, MRS, in water at
20 °C for 50 years, as specified in DIN EN ISO 12162 (with the exception of pipes made from PE-HD).
Table 1: Material designation
Minimum required
Material designation strength *), MRS,
in N/mm2
PE 63 6,3
PE 80 8,0
PE 100 10,0
PE-HD
I See DIN EN ISO 12162 for definition.
Page 3
DIN 8075 : 1999-08
3.3 Ovality
The difference between the maximum and minimum pipe outside diameters at the same cross section.
4 Material (moulding material)
4.1 General
Pipes shall be made from polyethylene (PE), stabilized using suitable antioxidants and usually coloured
throughout with carbon black or other pigments. The choice of stabilizers and other additives shall be left to
the pipe manufacturer. Moulding materials of unknown composition shall not be used.
4.2 Checking long-term hydrostatic pressure resistance
In the case of pipes made from PE 63, PE 80 and PE 100, values for hydrostatic pressure resistance shall lie
on or above the time-to-failure (t) curves, as shown in figures 1 to 3, and established using the following
equation:
l 9 t=A+^+D^l
^ 9u (2)
where
6 is the induced hydrostatic stress;
A, C, and D are coefficients as in table 2;
T is the temperature in K.
Table 2: Coefficients for determining the time -to-failure curves
Coefficients
Material Section of curve
A C D
Flat -41,417 3 22 008 , 572 2 -35,0987
PE 63
Steep - 19,882 3 8 619 , 357 0 -3,0390
Flat -40 , 9578 23 596 , 349 5 -37,5758
PE 80
Steep -19,9417 8 804 , 433 3 -3,3219
Flat -38 , 9375 24482 ,4670 -38,9789
PE 100
Steep -20,3159 9342,6930 -4,5076
Analysis according to ISO/TR 9080 requires the temperature-dependent extrapolation time limits to be taken
into consideration.
Page 4
DIN 8075 ;1999-08
50
40
30
25
hO
E 15
z
b0 10 10°C
c9
20°C
'^ 8
°
a)7
40°C
a
0 50°C
U 5
c^ 60°C
II III
Cl,
0 4 70°C
0
r
80°C
E
0)
C
0
J
IF
2
1 10 25 50100
Time to failure, in years -.
1
U
1 10 102 1 o' 106
Time to failure , in hours --
Figure 1: Long -term hydrostatic pressure resistance of pipes made from PE 63
Page 5
DIN 8075 :1999-08
50
40
E
30
25
t20
f
i
10°C
111111
20°C
30°C
I
)f
50°C
d'
ii:
I1II1
6010
^I fII
30°C
IIII
80°C
I1
2
1 10 25 50100
Time to failure, in years --g
1
II( IIIiII
1 10 102 145 105
Time to failure, in hours --
Figure 2 : Long-term hydrostatic pressure resistance of pipes made from PE 80
Page 6
DIN 8075 :1999-08
50
40
30
25
t 2a
1 0°
I Ii
2 0 oC
V
t0
i
of
1 Ui
.o oc
t oc
Ffl
.o
7 111
.o oc
1 0 oc
H
8 0° C
1,5 I i I I
1 10 25 5010
Time to failure, in years
1
1 10 102 1a3
ilia I 1111111 I LLHIIII
10^ 106
Time to failure, in hours --w'
Figure 3 : Long -term hydrostatic pressure resistance of pipes made from PE 100
Page 7
DIN 8075 :1999-08
5 Requirements
5.1 Form supplied
Pipe ends should be cut as square as possible to the pipe axis. Pipes shall be free from any blisters and
irregularities (including foreign matter) which could affect their performance. Pigmentation shall be uniform
throughout.
5.2 Surface finish
Pipes shall be smooth both inside and outside. Minor irregularities and shallow grooves are permissible,
provided the minimum wall thickness is maintained throughout. Sharp-edged grooves are not permissible.
5.3 Dimensions and tolerances
The pipe outside diameter, wall thickness and ovality shall comply with the specifications of DIN 8074, which
applies by analogy to pipes whose sizes deviate from the series of preferred numbers given in DIN 323-1 and
from international specifications.
5.4 Long-term hydrostatic pressure resistance
When tested in accordance with subclause 6.4 under the conditions specified in table 3, pipes shall neither fail
nor develop any signs of leakage.
Table 3: Test conditions for hydrostatic pressure testing
Period of stressing
Test temperature, Proof stress, o,
Material (minimum time to failure),
in °C in N/mm2
t, in hours
P E 63 20 8,0 100
80 3,5 165
80 3,2 1000
PE 80 20 10,0 100
80 4,6 165
80 4,0 1000
PE 100 20 12,4 100
80 5,5 165
80 5,0 1000
5.5 Heat reversion
When testing in accordance with subclause 6.5, the mean relative change in pipe length shall not be greater than
3%, except where wall thicknesses are greater than 16 mm.
6 Testing
6.1 Form supplied and surface finish
The inside and outside surfaces of the pipe shall be inspected with back light, using no optical instruments.
6.2 Dimensions
The mean pipe outside diameter shall be determined to within 0,1 mm by circumferential measurement at both
pipe ends, at a point at least 0,5 d from the cut edge. The wall thickness shall be determined to within 0,1 mm
at both ends, at at least four points spaced evenly around the circumference of the pipe.
Measurements shall be taken at ambient temperature, or at (23 ± 2) °C in case of dispute.
6.3 Ovality
Immediately after production, ovality shall be be determined by measuring the minimum and maximum outside
diameters to an accuracy of 0,1 mm.
6.4 Long -term hydrostatic pressure resistance
General information on testing is given in DIN EN 921. For each proof stress value as given in table 3, three
sections of pipe (referred to below as pipes) with a length, li, as follows shall be taken as specimens:
Page 8
DIN 8075 :1999-08
where d is 250 mm or less: l1 3 d + 2l5 + 250 mm;
where d is greater than 250 mm: 11 1000 mm + 215.
14
'1
Figure 4: Specimens for hydrostatic pressure resistance test
where, in figure 4 and the preceding equations,
d is the pipe outside diameter, in mm;
11 is the specimen length, in mm;
12 is the test length, in mm;
13 is the length of pipe affected by the sealing devices being clamped, in mm:
for d <_ 250 mm: 13 = d;
ford>250mm: 13=250 mm;
14 is the assessment length, in mm (12 - 213);
15 is the free length, in mm (for mounting a sealing device)
Along the assessment length, the wall thickness and the outside diameter shall be determined by circumfer-
ential measurement at eight and three points respectively, and the minimum wall thickness, Smin' and the mean
outside diameter, d, established.
Sealing devices shall be fitted to both ends of the specimen, allowing it free axial movement during the test.
The specimen shall be filled with water at the test temperature specified in table 3 (±5 K) through an opening
in one of the sealing devices, placed in a tank which has been heated to test temperature (maintained to within
± 1 K) and left there for at least one hour to reach thermal equalization. If the pipe is filled with cooler water, it
shall be left in the tank for 12 hours.
With the pipe remaining in the tank, hydrostatic pressure shall be steadily increased to proof pressure within
one minute. The pressure shall be maintained to within 2,5 % throughout the period specified in table 3 (mini-
mum time to failure).
The proof pressure, Pep, shall be calculated as follows:
2 Smin a0
pe, p
(3)
d -Smin
where
d is the mean outside diameter over 14;
S,nin is the minimum wall thickness over 14;
£70 is the proof stress as specified in table 3 (or 4).
Check whether the pipe has failed or developed signs of leakage during the specified period of stressing. If the
pipe has failed within 13 during this period, the results of the test shall not count and the test shall be repeated.
If failure with deformation occurs before 165 hours at 80 °C at test pressures 3,5, 4,6 and 5,5 N/mm2, a follow-
up test may be carried out at a lower test pressure and for an exposure period at least as long as that specified
in table 4.
Table 4: Test conditions for follow-up testing
PE 63 PE 80 PE 100
Proof stress , aa0, Time to failure, Proof stress, o, Time to failure, Proof stress , ao, Time to failure,
in N/mm2 t, in hours in N/mm2 t, in hours in N/mm2 t, in hours
3,5 165 4,6 165 5,5 165
3,4 295 4,5 219 5,4 233
3,3 538 4,4 293 5,3 332
3,2 1000 4,3 394 5,2 476
4,2 533 5,1 688
4,1 727 5,0 1000
4,0 1000
Page 9
DIN 8075 :1999-08
6.5 Heat reversion
Specimens shall be three pipe sections, each approximately 200 mm long or, for pipes with an outside diameter
of 200 mm or more, three machine-cut pieces with a length of approximately 200 mm and an arc length of
approximately 200 mm. In the latter case, the pipe section shall be divided into pieces that are 200 mm square,
taken from around its circumference (e.g. a section measuring 200 x 11,4 will be divided into three pieces). The
direction of the pipe axis shall be marked on the pieces. All pieces shall be subjected to testing.
Gauge marks shall be made on the outside of each specimen, approximately 50 mm from each end, along the
pipe axis (for pipe sections, around the circumference). The distance between the two reference marks , lo, shall
be approximately 100 mm, measured at ambient temperature to an accuracy of 0,25 mm.
The specimens shall be laid convex side down on a glass plate dusted with talcum, so that any change in length
shall not be hindered.
Subsequently, the glass plate shall be placed in an oven with forced air circulation in accordance with
DIN EN 743, which has been preheated to test temperature, as specified in table 5.
Table 5: Conditions for heat reversion test
Wall thickness, s, Test temperature, Test period, t,
in mm in °C in minutes
Upto8 60±1
110±2
Over 8 up to 16 120 ± 2
After removing the specimens from the oven and allowing them to cool to ambient temperature in the same
position, the minimum distance between the two gauge marks, lmil,, shall be measured.
The relative change in length, E, expressed as a percentage, shall be calculated as follows:
e= lo^ lmin ,100 = ^l 100 4
l0 0 l ( )
where
to is the distance between gauge marks before heat treatment, in mm;
l,nip is the distance between gauge marks after heat treatment and cooling, in mm;
Ol =
l0 - lmin'
The arithmetical mean of the relative change in length, e, calculated from equation (4), shall be taken as the mean
relative change in length, s, for the tested pipe.
6.6 Test certificate
By agreement, the pipe manufacturer shall issue a DIN EN 10204 inspection document.
Appendix A
Hydrostatic pressure testing for pipes made from PE-HD
For PE-HD pipes designed for non-pressure applications, the following conditions shall apply for testing.
Table A.1: Conditions for long -term hydrostatic pressure test
Period of stressing
Test temperature , Proof stress u,
Material (minimum time to failure),
in C in N/mm
t, in hours
PE-HD 80 4 170
Page 10
DIN 8075 :1999-08
Appendix B
50
40
30
25
1
zo
f
15
10°C
I Hll
20 ° C
III .
30°C
4 0 `'CI
I I IIII
50°C
0
60°CI
30111
80L
1
0,9
0,8 filL L_1
0,7 1 10 25 50
0,6
tLL T ime to f a lure, in ye ars
0,5
11 1 111 1111 11 [[ill
0,1 1 10 10 2 10 3 10 106
Time to failure, in hours -^
Figure B.1: Long -term hydrostatic pressure resistance of pipes made from PE-HD
Page 11
DIN 8075 : 1999-08
Explanatory notes
This standard is a basic standard and therefore does not cover the scope of testing, inspection, or requirements
relating to special applications.
The hydrostatic pressure resistance requirements specified here are based on experiments which have taken
the probable service life of the pipes into consideration. Polyethylene pipes may be expected to have a service
life of 100 years.
In testing for resistance to internal pressure, the quality of the pipe is defined by requirements that specify that
the pipe is to resist without failure a specific proof pressure (corresponding to the specified a value) for a
minimum period of exposure at an increased temperature.
For pipes in contact with foodstuffs, the toxicological stipulations in the relevant KTW-Empfehlungen (KTW
Recommendations) of the Bundesgesundheitsamt (German Federal Health Office) and any other pertinent
specifications shall be observed. Pipes for medical applications shall be subject to particular agreement.
Specifications with regard to the composition of the pipe material and methods of manufacture have not been
included so as not to impede technical innovation. The specification that moulding material of unknown com-
position should not be used is intended to prevent the use of unsuitable material, while allowing the manufac-
turers to derive technical and economic advantages from using reworked material.
Table 0.1 gives guideline values for the properties of PE pipes specified in this standard.
Table C.1: Properties and guideline values
Property Guideline values
Mean coefficient of linear thermal expansion at temperatures between 0 °C 2.10.4 K-1
and 70 °C (testing as in DIN 53752)
Thermal conductivity (testing as in DIN 52612-1) N 0,41 WK-1 m-1
Minimum modulus of elasticity (testing as in DIN EN ISO 178) 480 N/mm2
Surface resistivity (testing as in IEC 60093) > 1012 Q
Pipes conforming to this standard comply with the requirements for building material class B 2 as in
DIN 4102-1.
Other relevant standards
DIN 41 02-1 1 Fire behaviour of building materials and elements - Pipe encasements, pipe sleeves, ser-
vice shafts and ducts, and barriers across inspection openings - Terminology,
requirements and testing
DIN 53752 Determination of coefficient of linear thermal expansion of plastics
DIN EN ISO 527-2 Determination of tensile properties of plastics - Test conditions for moulding and extrusion
plastics (ISO 527-2 :1993 + Corr 1 :1994)
