SIST EN 295-7:2013
(Main)Vitrified clay pipe systems for drains and sewers - Part 7: Requirements for pipes and joints for pipe jacking
Vitrified clay pipe systems for drains and sewers - Part 7: Requirements for pipes and joints for pipe jacking
This European Standard specifies requirements for vitrified clay pipes and joints for pipe jacking for buried drain and sewer systems for the conveyance of wastewater (including domestic wastewater, surface water and rainwater) under gravity and periodic hydraulic surcharge or under continuous low head of pressure. Pipe jacking techniques include micro-tunnelling, pipe-eating, pipe bursting and where appropriate lining with discrete pipes. This standard also specifies requirements for rubber, polyurethane, polypropylene, stainless steel and other materials used for joints for pipe jacking.
Steinzeugrohrsysteme für Abwasserleitungen und -kanäle - Teil 7: Anforderungen an Rohre und Verbindungen für Rohrvortrieb
Diese Europäische Norm legt Anforderungen für Steinzeugrohre mit flexiblen Verbindungen zum Bau erdverlegter Abwasserleitungen und -kanäle fest, die für die Ableitung von Abwasser (einschließlich häus-lichem Abwasser, Oberflächenwasser und Regenwasser) als Freispiegelleitung und unter zeitweise er¬höhtem Druck oder bei dauerhaft niedrigen Überdrücken verwendet und unter Anwendung von Verfahren des Rohrvortriebs verlegt werden, einschließlich Mikro-Tunnelbau (ferngesteuerter, unbemannter Rohrvortrieb), Rohrüberfahren (en: pipe eating), Rohraufweiten (en: pipe bursting) und, sofern geeignet, Einzelrohrlining.
Diese Norm legt ebenfalls die Anforderungen an Werkstoffe aus Gummi, Polyurethan, Polypropylen und nichtrostendem Stahl sowie andere Werkstoffe für Verbindungen fest.
Systèmes de tuyaux et accessoires en grès pour les réseaux de branchement et d’assainissement - Partie 7: Exigences pour les tuyaux et leurs assemblages destinés au fonçage
La présente Norme européenne spécifie les exigences pour les tuyaux en grès vitrifié assemblés de manière souple pour la construction de collecteur et branchement enterrés pour le transport des eaux usées (y compris les eaux usées domestiques, les eaux de surface et les eaux de pluie) par gravité et surcharge hydraulique périodique ou à une faible hauteur de charge prolongée, installés en utilisant des techniques de fonçage de tuyaux, y compris par micro tunnelier, "pipe-eating", par éclatement de tuyau et le cas échéant avec des tuyaux différents pour le revêtement.
La présente Norme spécifie également les exigences pour les matériaux de caoutchouc, polyuréthane, polypropylène, acier inoxydable et autres utilisés pour les joints.
NOTE Des dispositions correspondantes pour l’évaluation de la conformité (essais de type initiaux [ETI] et contrôle
de production en usine [CPU]) et l’échantillonnage et les dispositions pour les méthodes d’essai sont spécifiées
respectivement dans l’EN 295-2 et l’EN 295-3.
Keramični cevni sistemi za odvod odpadne vode in kanalizacijo - 7. del: Zahteve za keramične cevi in spoje za potisne cevi
Ta evropski standard določa zahteve za keramične cevi in spoje za potisne cevi za podzemne odvodne in kanalizacijske sisteme za prenos odpadne vode (vključno s komunalno odpadno vodo, površinsko vodo in deževnico) pod vplivom težnosti in ponavljajoče hidravlične prenapetosti ali trajnega nizkega tlaka. Tehnike potisnih cevi vključujejo mikro tuneliranje, menjavanje cevi, polaganje brez jarka in, kjer je primerno, polaganje ločenih cevi. Ta standard določa tudi zahteve za gumo, poliuretan, polipropilen, nerjavno jeklo ter druge materiale, ki se uporabljajo za spoje za potisne cevi.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 295-7:2013
01-julij-2013
1DGRPHãþD
SIST EN 295-10:2005
SIST EN 295-7:1996
.HUDPLþQLFHYQLVLVWHPL]DRGYRGRGSDGQHYRGHLQNDQDOL]DFLMRGHO =DKWHYH]D
NHUDPLþQHFHYLLQVSRMH]DSRWLVQHFHYL
Vitrified clay pipe systems for drains and sewers - Part 7: Requirements for pipes and
joints for pipe jacking
Steinzeugrohrsysteme für Abwasserleitungen und -kanäle - Teil 7: Anforderungen an
Rohre und Verbindungen für Rohrvortrieb
Systèmes de tuyaux et accessoires en grès pour les réseaux de branchement et
d’assainissement - Partie 7: Exigences pour les tuyaux et leurs assemblages destinés au
fonçage
Ta slovenski standard je istoveten z: EN 295-7:2013
ICS:
23.040.50 Cevi in fitingi iz drugih Pipes and fittings of other
materialov materials
91.140.80 Drenažni sistemi Drainage systems
93.030 Zunanji sistemi za odpadno External sewage systems
vodo
SIST EN 295-7:2013 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 295-7:2013
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SIST EN 295-7:2013
EUROPEAN STANDARD
EN 295-7
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2013
ICS 93.030 Supersedes EN 295-10:2005, EN 295-7:1995
English Version
Vitrified clay pipe systems for drains and sewers - Part 7:
Requirements for pipes and joints for pipe jacking
Systèmes de tuyaux et accessoires en grès pour les Steinzeugrohrsysteme für Abwasserleitungen und -känale -
réseaux de branchement et d'assainissement - Partie 7: Teil 7: Anforderungen an Rohre und Verbindungen für
Exigences pour les tuyaux et leurs assemblages destinés Rohrvortrieb
au fonçage
This European Standard was approved by CEN on 1 December 2012.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 295-7:2013: E
worldwide for CEN national Members.
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SIST EN 295-7:2013
EN 295-7:2013 (E)
Contents Page
Foreword . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Requirements for pipes for pipe jacking . 6
4.1 Materials, manufacture, water absorption and appearance . 6
4.2 Dimensions. 7
4.2.1 General . 7
4.2.2 Internal diameter . 7
4.2.3 Tolerance on the declared internal diameter . 7
4.2.4 Continuity of invert . 8
4.2.5 External diameter . 8
4.2.6 Length . 9
4.2.7 Squareness of ends . 9
4.2.8 Deviation from straightness . 9
4.3 Strength . 9
4.3.1 Crushing strength (F ) . 9
N
4.3.2 Bending tensile strength. 10
4.3.3 Compressive strength . 10
4.3.4 Jacking strength . 10
4.3.5 Maximum working jacking load . 11
4.3.6 Fatigue strength under cyclic load . 11
4.4 Watertightness . 11
4.5 Airtightness . 11
4.6 Chemical resistance . 12
4.7 Hydraulic roughness . 12
4.8 Abrasion resistance . 12
4.9 Resistance against high pressure water jetting . 13
5 Requirements for joints for pipe jacking . 13
5.1 Joint materials . 13
5.1.1 Rubber sealing elements . 13
5.1.2 Polyurethane sealing elements . 13
5.1.3 Stainless steel sleeves . 13
5.1.4 Polypropylene sleeve couplings . 13
5.1.5 Other materials . 13
5.2 Load transfer rings . 13
5.3 Watertightness of joints under deflection and shear load . 14
5.3.1 General . 14
5.3.2 Test pressures. 14
5.4 Angular deflection . 14
5.5 Shear resistance . 14
5.6 Chemical and physical resistance to effluent . 14
5.7 Thermal cycling stability . 15
5.8 Long-term thermal stability . 15
6 Common requirements for pipes and joints . 15
6.1 Reaction to fire . 15
6.2 Durability . 15
6.3 Dangerous substances . 16
7 Designation . 16
2
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SIST EN 295-7:2013
EN 295-7:2013 (E)
8 Marking .1 6
9 Evaluation of conformity .1 7
9.1 General .1 7
9.2 Initial type testing .1 7
9.3 Factory production control (FPC) .1 7
Annex ZA (informative) Clauses of this European Standard addressing the provisions of the EU
Construction Products Directive .1 8
ZA.1 Scope and relevant characteristics .1 8
ZA.2 Procedures for the attestation of conformity of vitrified clay pipes and joints for pipe
jacking .2 0
ZA.2.1 Systems of attestation of conformity .2 0
ZA.2.2 EC declaration of conformity .2 1
ZA.3 CE marking .2 1
ZA.3.1 General .2 1
ZA.3.2 CE marking on the product .2 1
ZA.3.3 CE marking in the accompanying documents .2 2
Bibliography .2 5
3
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SIST EN 295-7:2013
EN 295-7:2013 (E)
Foreword
This document (EN 295-7:2013) has been prepared by Technical Committee CEN/TC 165 “Wastewater
engineering”, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by August 2013, and conflicting national standards shall be withdrawn at
the latest by August 2013.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 295-7:1995 and together with EN 295-1:2013, EN 295-2:2013,
EN 295-4:2013, EN 295-5:2013 and EN 295-6:2013 it supersedes EN 295-10:2005.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.
The main changes with respect to the previous edition are listed below:
nominal sizes DN 900, DN 1 200 and DN 1 400 added;
requirements for the determination of jacking strength changed;
requirements for the resistance to high pressure water jetting added;
requirements for water absorption added;
reaction to fire added;
Annex ZA added;
editorially revised.
The standard series EN 295 "Vitrified clay pipe systems for drains and sewers" consists of the following parts:
Part 1: Requirements for pipes, fittings and joints
Part 2: Evaluation of conformity and sampling
Part 3: Test methods
Part 4: Requirements for adaptors, connectors and flexible couplings
Part 5: Requirements for perforated pipes and fittings
Part 6: Requirements for components of manholes and inspection chambers
Part 7: Requirements for pipes and joints for pipe jacking (the present document)
According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
4
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SIST EN 295-7:2013
EN 295-7:2013 (E)
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
5
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SIST EN 295-7:2013
EN 295-7:2013 (E)
1 Scope
This European Standard specifies requirements for vitrified clay pipes and joints for pipe jacking for buried
drain and sewer systems for the conveyance of wastewater (including domestic wastewater, surface water
and rainwater) under gravity and periodic hydraulic surcharge or under continuous low head of pressure. Pipe
jacking techniques include micro-tunnelling, pipe-eating, pipe bursting and where appropriate lining with
discrete pipes.
This standard also specifies requirements for rubber, polyurethane, polypropylene, stainless steel and other
materials used for joints for pipe jacking.
NOTE Corresponding provisions for the evaluation of conformity (ITT and FPC) and sampling and those for the test
methods are further specified in EN 295-2 and EN 295-3, respectively.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 295-1:2013, Vitrified clay pipe systems for drains and sewers — Part 1: Requirements for pipes, fittings
and joints
EN 295-2:2013, Vitrified clay pipe systems for drains and sewers — Part 2: Evaluation of conformity and
sampling
EN 295-3:2012, Vitrified clay pipe systems for drains and sewers — Part 3: Test methods
EN 312, Particleboards — Specifications
EN 681-1, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage
applications — Part 1: Vulcanized rubber
EN 681-4, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage
applications — Part 4: Cast polyurethane sealing elements
EN 10088-2:2005, Stainless steels — Part 2: Technical delivery conditions for sheet/plate and strip of
corrosion resisting steels for general purposes
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 295-1:2013 and the following apply.
3.1
jacking strength
declared capacity of the pipe to carry axial load without taking site conditions into account
3.2
maximum working jacking load
calculated allowable axial load on the pipe during construction, taking site conditions into account
4 Requirements for pipes for pipe jacking
4.1 Materials, manufacture, water absorption and appearance
For material, manufacture, water absorption and appearance, jacking pipes shall comply with EN 295-1:2013,
5.1.
6
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EN 295-7:2013 (E)
4.2 Dimensions
4.2.1 General
Relevant dimensions of pipes or pipe sections shall be measured after grinding or cutting of ends.
4.2.2 Internal diameter
The internal diameter shall not be less than the values given in Table 1.
Table 1 — Internal diameter
Nominal size Minimum internal diameter
DN mm
100 96
150 146
200 195
225 219
250 244
300 293
400 390
500 487
600 585
700 682
800 780
900 878
1 000 975
1 200 1 170
1 400 1 365
Other nominal sizes can be manufactured to comply with this standard, provided that the minimum internal
diameter shall be not less than 97,5 % of the nominal size, rounded to the nearest whole mm.
4.2.3 Tolerance on the declared internal diameter
The internal diameter of a pipe shall not deviate from the manufacturers declared value by an amount greater
than the tolerance given in Table 2.
7
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SIST EN 295-7:2013
EN 295-7:2013 (E)
Table 2 — Tolerance on internal diameter
Nominal size Tolerance on declared internal diameter
DN mm
≤ 300 ± 5
400
± 6
500
± 7,5
600
± 9
700
± 12
800
± 12
900
± 12
1 000
± 15
1 200
± 18
1 400
± 30
4.2.4 Continuity of invert
The calculated difference in invert levels between pipes shall not exceed the values given in Table 3, when
measured in accordance with EN 295-3:2012, Clause 22.
If it is necessary for achieving continuity of invert, the pipe shall be marked.
Table 3 — Continuity of invert
Nominal size Continuity of invert
DN mm
4
≤ 400
> 400 0,01 x DN
4.2.5 External diameter
The external diameter of the barrel of a pipe shall not deviate from the manufacturers declared value by an
amount greater than the tolerance given in Table 4.
8
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SIST EN 295-7:2013
EN 295-7:2013 (E)
Table 4 — Tolerance on external diameter
Nominal size Tolerance on declared external diameter
DN mm
0
≤ 300
−10
0
400
−12
0
500
−15
0
600
−18
0
700
−24
0
800
−24
0
900
−28
0
1 000
−30
0
1 200
−36
0
1 400
−60
4.2.6 Length
Lengths of pipes are not specified in this standard. The length shall be measured at 90° intervals around the
circumference and the average value calculated. The tolerance on the measured average length shall be
± 2 mm on the manufacturer’s declared nominal length.
4.2.7 Squareness of ends
When tested in accordance with EN 295-3:2012, 5.2, the maximum deviation from squareness measured at
the pipe ends shall be not greater than 1 mm.
4.2.8 Deviation from straightness
When tested using a straight edge in the maximum bending plane, along the whole length of the pipe barrel
which is not affected by jointing or grinding, the deviation from straightness at the mid-point shall be not
greater than 5 mm.
4.3 Strength
4.3.1 Crushing strength (F )
N
When tested in accordance with EN 295-3:2012, Clause 7, the crushing strength (F ) of pipes or pipe
N
sections shall be not less than the values given in Table 5. Higher crushing strengths can be declared.
9
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SIST EN 295-7:2013
EN 295-7:2013 (E)
Table 5 — Crushing strengths
Nominal size Minimum crushing strength
DN
(F )
N
kN/m
100 40
150 52
200 64
250 80
300 96
400 100
500 100
600 100
700 100
800 100
900 100
1 000 100
1 200 100
1 400 90
4.3.2 Bending tensile strength
If it is required to determine the crushing strength where whole pipes or pipe sections are not available, for
example after failure in use, a bending tensile strength test, in accordance with EN 295-3:2012, Clause 8,
shall be carried out on broken pipe pieces.
The crushing strength of the pipe shall be calculated from the mean bending tensile strength of at least ten
test pieces.
4.3.3 Compressive strength
The compressive strength shall be determined according to EN 295-3:2012, Clause 27. The minimum
2
compressive strength shall not be less than 100 N/mm .
4.3.4 Jacking strength
The jacking strength of the pipe shall be calculated using the minimum compressive strength and the
minimum annular area through which the jacking forces act. The load transferring area shall be calculated
using the wall thickness at the pipe end, the type of joint, the location of sealing rings and the means of load
transfer.
The minimum annular area is located either at the base of any groove holding the joint sealing ring or at the
load transfer ring and shall be calculated using Formula (1).
π
2 2
A = (d −d ) (1)
min a i
4
where
10
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SIST EN 295-7:2013
EN 295-7:2013 (E)
2
A is the minimum annular area in mm ;
min
d is the minimum external diameter at the minimum cross section in mm;
a
d is the maximum internal diameter at the minimum cross section in mm.
i
The jacking strength of the pipe shall be calculated using Formula (2).
−3
F =σ ×A ×10 (2)
J c,min min
where
F is the jacking strength, in kN;
J
2
σ minimum compressive strength in N/mm .
c,min
4.3.5 Maximum working jacking load
The maximum working jacking load shall be calculated using the jacking strength F divided by the factors of
J
safety for clay pipes used in static calculations for the jacking technique used.
NOTE 1 Factors of safety are normally agreed between manufacturers, designers, contractors and clients as
appropriate.
NOTE 2 The maximum working jacking load at main and intermediate jacking stations for jacking pipes with angular
deflectable joints is considered as the standard case with a continuously distributed stress value σ, applied at the
0
theoretical, centrally acting resultant of the jacking force, where the stress ratio is modified by the eccentric action of the
jacking load, if the resultant acts outside of the centre of the cross section. Eccentric action is identifiable by the opening of
the joints on one side of the pipe. For deviations from the planned direction and at planned cornering, measurement of the
deviation of individual joints from the centre should be taken into account and the calculation of the maximum working
jacking load adjusted.
Where the conditions of use are known, jacking pipes can additionally be marked with the result of the
standard calculation of the maximum working jacking load.
4.3.6 Fatigue strength under cyclic load
Where the resistance to fatigue under cyclic loads is required, it shall be demonstrated by testing in
accordance with EN 295-3:2012, Clause 11, when test pieces shall not fail.
4.4 Watertightness
When pipes or pipe sections are tested in accordance with EN 295-3:2012, Clause 12, the water addition W
15
2
needed to maintain the pressure of 50 kPa (0,5 bar) shall not exceed 0,04 l/m of internal pipe surface area
and shall show no visible leakage.
If pipes are required to withstand continuous working under low pressure, the test pressure and water addition
W shall be declared.
15
4.5 Airtightness
Pipes and pipe sections shall be tested in accordance with EN 295-3:2012, Clause 16. The barrels of the
pipes shall be tested under positive pressure (using one of the methods LA, LB, LC or LD) given in Table 6 or
negative pressure (using either method LCU or LDU) given in Table 7. The measured change in pressure ∆p
from an initial air pressure p shall not be greater than the values given in Table 6 or Table 7 for the
0
appropriate test method, nominal size (DN) and testing time.
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EN 295-7:2013 (E)
NOTE Procedures and values for positive pressure testing are consistent with EN 12889, which does not include
negative pressure testing, stating that there is currently insufficient experience with the method.
Table 6 — Initial pressure, change in pressure and testing times under positive pressure
Test Nominal size DN
Initial Change in
method
pressure pressure
≤ 200 225 300 400 600 800 1000
p p
0 0
p
∆p
0
Testing time
mm mm
minutes
water water
kPa gauge kPa gauge
LA 1 100 0,25 25 5 5 7 10 14 19 24
LB 5 500 1 100 4 5 6 7 11 15 19
LC 10 1 000 1,5 150 3 4 4 5 8 11 14
LD 20 2 000 1,5 150 1,5 1,5 2 2,5 4 5 7
Table 7 — Initial pressure, change in pressure and testing times under negative pressure
Test Initial Change in Nominal size DN
method pressure pressure
≤ 225 300 400 500 600 700 800 900 1 000
p p p
∆p
0 0 0
Testing time
mm mm
minutes
water water
kPa
kPa
gauge gauge
LCU -10 -1 000 1,1 110 2,5 3 4 5 6 7 8 9 10
LDU -20 -2 000 1,1 110 1 1,5 2 2,5 3 3,5 4 4,5 5
NOTE An equivalent head of water of 100 mm ≈ 1 kPa has been used in Tables 6 and 7.
4.6 Chemical resistance
When tested in accordance with EN 295-3:2012, Clause 13, the loss of material from the test piece shall be
declared.
NOTE Under normal conditions of use, vitrified clay pipes are considered to be resistant to chemical attack and
expected to show typical values of loss of material between 0,1 % and 0,25 %.
4.7 Hydraulic roughness
Where the hydraulic roughness is required, it shall be demonstrated by testing in accordance with
EN 295-3:2012, Clause 14, and the hydraulic roughness declared.
NOTE Vitrified clay pipes for pipe jacking have a low hydraulic roughness (typically between 0,02 mm and 0,05 mm).
4.8 Abrasion resistance
Where the abrasion resistance is required, it shall be demonstrated by testing in accordance with
EN 295-3:2012, Clause 15, and the mean depth of abrasion declared.
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SIST EN 295-7:2013
EN 295-7:2013 (E)
NOTE 1 Under normal conditions of use, vitrified clay pipes are considered to be resistant to abrasion and have shown
typical values between 0,25 mm and 0,50 mm after 100,000 load cycle.
NOTE 2 Vitrified clay pipes for pipe jacking have a Mohs scratch hardness value of 7.
4.9 Resistance against high pressure water jetting
The jetting resistance shall be tested in accordance with EN 295-3:2012, 17.2, at 12 MPa (120 bar) using a
moving nozzle and/or EN 295-3:2012, 17.3, at 280 bar using a stationary nozzle. After testing, the appearance
of the pipe shall be in accordance with EN 295-1:2013, 5.1.2 and 5.1.4.
NOTE Vitrified clay pipes and fittings are considered to be resistant to high pressure water jetting when tested as
specified without damage.
5 Requirements for joints for pipe jacking
5.1 Joint materials
5.1.1 Rubber sealing elements
Rubber sealing elements shall be in accordance with EN 681-1.
5.1.2 Polyurethane sealing elements
Polyurethane sealing elements shall be in accordance with EN 681-4.
5.1.3 Stainless steel sleeves
Stainless steels shall be either 1.4307, 1.4301, 1.4404, 1.4401 or 1.4571 from EN 10088-2:2005, Table 3 or
have equivalent or greater corrosion resistance.
The sleeves shall be edge dressed and free from sharp edges.
When stainless steel sleeves are butt welded, the welds shall have full penetration and be continuous across
the full width of the sleeves.
When filler metal is used for the welds, it shall be compatible with the stainless steel sleeve material, and in
compliance with the recommendations of the stainless steel sleeve material manufacturer.
After welding, oxides shall be removed.
The internal surface of the sleeve shall be finished to provide a sealing surface.
5.1.4 Polypropylene sleeve couplings
Polypropylene sleeve couplings sha
...
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