ISO 15590-2:2003
(Main)Petroleum and natural gas industries — Induction bends, fittings and flanges for pipeline transportation systems — Part 2: Fittings
Petroleum and natural gas industries — Induction bends, fittings and flanges for pipeline transportation systems — Part 2: Fittings
ISO 15590-2:2003 specifies the technical delivery conditions for unalloyed or low-alloy steel seamless and welded pipeline fittings for use in pipeline transportation systems for the petroleum and natural gas industries as defined in ISO 13623. ISO 15590-2:2003 is applicable to welding end-fittings such as elbows, caps, tees, single or multiple extruded headers, reducers, and transition sections made from seamless and welded pipe of unalloyed or low-alloy steels. ISO 15590-2:2003 specifies three classes of fitting corresponding to increasing quality requirements in accordance with the technical delivery conditions of ISO 3183 for pipe. ISO 15590-2:2003 is not applicable to the selection of the fitting class. ISO 15590-2:2003 is not applicable to the materials for, or the attachment of, factory-welded extensions.
Industries du pétrole et du gaz naturel — Coudes d'induction, raccords et brides pour systèmes de transport par conduites — Partie 2: Raccords
General Information
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 15590-2
First edition
2003-12-15
Petroleum and natural gas industries —
Induction bends, fittings and flanges for
pipeline transportation systems —
Part 2:
Fittings
Industries du pétrole et du gaz naturel — Coudes d'induction, raccords
et brides pour systèmes de transport par conduites —
Partie 2: Raccords
Reference number
ISO 15590-2:2003(E)
©
ISO 2003
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ISO 15590-2:2003(E)
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ii © ISO 2003 — All rights reserved
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ISO 15590-2:2003(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope. 1
2 Normative references. 1
3 Terms and definitions. 3
4 Symbols and abbreviated terms. 4
5 Designation. 5
6 Pressure rating and design. 5
6.1 General. 5
6.2 Tees and headers. 5
6.3 Extruded outlet headers. 5
7 Information to be supplied by the purchaser. 6
7.1 Principal information. 6
7.2 Supplementary information. 6
8 Manufacturing. 7
8.1 Manufacturing procedure specification. 7
8.2 Starting material. 7
8.3 Fitting manufacture. 8
9 Testing and inspection. 10
9.1 General requirements. 10
9.2 Extent of testing and inspection . 10
9.3 Chemical composition. 12
9.4 Mechanical testing. 12
9.5 Non-destructive testing. 17
9.6 Dimensions. 19
9.7 Gauging. 20
9.8 Hydrostatic testing. 20
10 Inspection document. 20
11 Marking. 20
Annex A (normative) Design calculations . 21
Annex B (normative) Proof test. 23
Bibliography . 26
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ISO 15590-2:2003(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 15590-2 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures
for petroleum, petrochemical and natural gas industries, Subcommittee SC 2, Pipeline transportation systems.
ISO 15590 consists of the following parts, under the general title Petroleum and natural gas industries —
Induction bends, fittings and flanges for pipeline transportation systems:
Part 1: Induction bends
Part 2: Fittings
The following part is under preparation:
Part 3: Flanges
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ISO 15590-2:2003(E)
Introduction
Users of this part of ISO 15590 should be aware that further or differing requirements may be needed for
individual applications. This part of ISO 15590 is not intended to inhibit a manufacturer from offering, or the
purchaser from accepting, alternative equipment or engineering solutions for the individual application. This
can be particularly applicable where there is innovative or developing technology. Where an alternative is
offered, the manufacturer should identify any variations from this part of ISO 15590 and provide details.
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INTERNATIONAL STANDARD ISO 15590-2:2003(E)
Petroleum and natural gas industries — Induction bends,
fittings and flanges for pipeline transportation systems —
Part 2:
Fittings
1 Scope
This part of ISO 15590 specifies the technical delivery conditions for unalloyed or low-alloy steel seamless
and welded pipeline fittings for use in pipeline transportation systems for the petroleum and natural gas
industries as defined in ISO 13623.
This part of ISO 15590 is applicable to welding-end fittings such as elbows, caps, tees, single or multiple
extruded headers, reducers, and transition sections made from seamless and welded pipe of unalloyed or
low-alloy steels.
This part of ISO 15590 specifies three classes of fitting corresponding to increasing quality requirements in
accordance with the technical delivery conditions of ISO 3183 for pipe as indicated in Table 1.
Table 1 — Fitting class and corresponding pipe standard
Fitting class Corresponding pipe standard
Class A ISO 3183-1
Class B ISO 3183-2
Class C ISO 3183-3
This part of ISO 15590 is not applicable to the selection of the fitting class.
This part of ISO 15590 is not applicable to the materials for, or the attachment of, factory-welded extensions.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 148 (all parts), Steel — Charpy impact test (V-notch)
ISO 377:1997, Steel and steel products — Location and preparation of samples and test pieces for
mechanical testing
ISO 783, Metallic materials — Tensile testing at elevated temperature
ISO 2566-1, Steel – Conversion of elongation values — Part 1: Carbon and low alloy steels
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ISO 15590-2:2003(E)
ISO 3183-1, Petroleum and natural gas industries — Steel pipe for pipelines — Technical delivery
conditions — Part 1: Pipes of requirement class A
ISO 3183-2, Petroleum and natural gas industries — Steel pipe for pipelines — Technical delivery
conditions — Part 2: Pipes of requirement class B
ISO 3183-3, Petroleum and natural gas industries — Steel pipe for pipelines — Technical delivery
conditions — Part 3: Pipes of requirement class C
ISO 3834-2, Quality requirements for welding — Fusion welding of metallic materials — Part 2:
Comprehensive quality requirements
ISO 4885, Ferrous products — Heat treatments — Vocabulary
ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method
ISO 6892, Metallic materials — Tensile testing at ambient temperature
ISO 7438, Metallic materials — Bend test
ISO/TR 7705:1991, Guidelines for specifying Charpy V-notch impact prescriptions in steel specifications
ISO 9712, Non-destructive testing — Qualification and certification of personnel
ISO 10474, Steel and steel products — Inspection documents
ISO 11496, Seamless and welded steel tubes for pressure purposes — Ultrasonic testing of tube ends for the
detection of laminar imperfections
ISO 12095, Seamless and welded steel tubes for pressure purposes — Liquid penetrant testing
ISO 12096, Submerged arc-welded steel tubes for pressure purposes — Radiographic testing of the weld
seam for the detection of imperfections
ISO 13623, Petroleum and natural gas industries — Pipeline transportation systems
ISO 13664, Seamless and welded steel tubes for pressure purposes — Magnetic particle inspection of the
tube ends for the detection of laminar imperfections
1)
ASME B16.9, Factory-made wrought butt welding fittings
ASME B31.8, Gas transmission and distribution piping systems
ASME IX, Boiler and pressure vessel code, Section IX — Welding and brazing procedures, welders, brazers,
and welding and brazing operators
2)
ASTM E 112, Standard test methods for determining average grain size
ASTM E 709, Standard guide for magnetic particle examination
EN 287-1, Approval testing of welders — Fusion welding — Part 1: Steels
EN 288-3, Specification and approval of welding procedures for metallic materials — Part 3: Welding
procedure tests for the arc welding of steels
1) American Society of Mechanical Engineers, 345 East 47th Street, NY 10017-2392, USA
2) American Society for Testing and Materials, 100 Bar Harbor Drive, West Conshohocken, PA 19428-2959, USA
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ISO 15590-2:2003(E)
3)
MSS SP-75, Specification for high test wrought butt welding fittings
4)
EFC Publication 16:1995 , Guidelines on materials requirements for carbon and low alloy steels for H S
2
containing environments in oil and gas production
3 Terms and definitions
For the purposes of this part of ISO 15590 the terms and definitions given in ISO 4885 and the following apply.
3.1
by agreement
agreed between manufacturer and purchaser
[ISO 15590-1:2001]
3.2
extrados
outer curved section of the elbow
NOTE Adapted from ISO 15590-1:2001.
3.3
heat, noun
batch of steel prepared in one steel-making process
NOTE Adapted from ISO 15590-1:2001.
3.4
intrados
inner curved section of the elbow
NOTE Adapted from ISO 15590-1:2001.
3.5
manufacturing procedure specification
MPS
document which specifies the process control parameters and the acceptance criteria to be applied for all
manufacturing, inspection and testing activities performed during fitting manufacture
3.6
tangent
straight section at the ends of the fitting
NOTE Adapted from ISO 15590-1:2001.
3.7
test unit
fitting or test piece of the same designation, starting material wall thickness, heat, manufacturing procedure
specification, and heat treatment condition
3) Manufacturers Standardization Society of the Valve & Fittings Industry, 127 Park Street, N.E., Vienna, Virginia 22180,
USA
4) European Federation of Corrosion, c/o The Institute of Materials, 1 Carlton House Terrace, London SW1Y 5DB,
United Kingdom
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ISO 15590-2:2003(E)
4 Symbols and abbreviated terms
A original cross-sectional area of the parallel length of a tensile test specimen
o
D outside diameter
D specified outside diameter of matching pipe
p
D minor outside diameter of a conical reducer or reducing tee at any point, n, under consideration,
n
measured perpendicular to the longitudinal axis
E factor used to calculate t (see A.1)
i
f factor used to calculate proof test pressure (see Table B.1)
P crack measurement parameter (see Table 4)
cm
p design pressure
p numerical value of the computed proof pressure
p
R tensile strength
m
R allowable tensile strength of a reducer
m, red
R yield strength for 0,5 % total elongation
t0,5
R specified minimum yield strength
smys
T minimum design temperature specified by the purchaser
d, min
t nominal wall thickness
t wall thickness of thicker component for joints of unequal thickness (see Figure 1)
D
t minimum wall thickness required in the intrados
i
t nominal wall thickness of matching pipe
p
t specified wall thickness of reducers and reducing tees at diameter D
n n
α included angle of a conical reducer
ρ radius of curvature of the external contoured portion of the outlet of a tee
o
CE carbon equivalent (see Table 4)
CTOD crack tip opening displacement
DN nominal size
HIC hydrogen-induced cracking
MT magnetic particle testing
NDT non-destructive testing
PT liquid penetrant testing
RT radiographic testing
SMYS specified minimum yield strength
SSC sulfide stress-cracking
UT ultrasonic testing
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ISO 15590-2:2003(E)
5 Designation
Designation of fittings shall take the form:
ISO 15590-2 YY xxx-Z,
where
YY is a textual description of the type of fitting, corresponding to one of the following: EL for elbow, TE for
tee, CA for cap, CR for concentric reducer, ER for eccentric reducer and NR for conical reducer,
preceeded by the size designation (e.g. “DN 600 EL” is a DN 600 elbow);
xxx is the specified minimum yield strength requirement in MPa;
Z is the suffix A or B or C, to identify the fitting class for use in non-sour service, or the suffix CS to
identify class C fittings for use in sour-service conditions.
6 Pressure rating and design
6.1 General
The capability of the fitting to withstand internal pressure shall equal or exceed that of the matching pipe. The
verification of the capability shall be made by calculation and/or proof testing. The calculations shall be made
in accordance with Annex A. The proof test procedure shall be as defined in Annex B. Additional requirements
on strength design verifications, such as resistance to internal pressure under special load cases in
accordance with ISO 13623, shall be indicated at the time of enquiry or order.
The design calculations and/or results of proof testing shall be available for review at the manufacturer’s
facility.
If the SMYS of the fitting material is less than that of the matching pipe, the minimum thickness of the fitting
end shall be increased such that the product of its thickness times its SMYS shall at least equal the product of
the specified wall thickness and the SMYS of the matching pipe, in accordance with MSS SP-75.
6.2 Tees and headers
Outlet branches in tees and headers manufactured from seam-welded pipe shall be positioned diametrically
opposite the longitudinal weld. When this positioning is not possible, the location shall be decided by
agreement.
The design and welding for the attachment of guide bars of barred tees shall be decided by agreement prior to
manufacture of the tee.
6.3 Extruded outlet headers
Extruded outlet headers shall be designed to comply with ASME B31.8.
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ISO 15590-2:2003(E)
7 Information to be supplied by the purchaser
7.1 Principal information
The purchaser shall provide the following information in the order given below:
a) fitting designation;
b) required fitting dimensions, including
1) nominal outside diameters,
2) minimum wall thicknesses at the welding ends,
3) radius and type of radius (e.g. long-radius),
4) the angle (for elbows);
NOTE Guidance on specific dimensions to specify is given in ISO 3545-3.
c) end-preparation details;
d) whether the purchaser wishes to approve the MPS prior to commencement of manufacturing.
7.2 Supplementary information
If applicable, the purchaser shall specify the following supplementary information:
a) minimum design temperature;
b) maximum design temperature;
c) maximum wall thickness;
d) special dimensional requirements;
e) requirements for supplementary inspection and testing;
f) requirements for gauging and other measurements of dimensions where different from this part of
ISO 15590;
g) pipeline design standard or design factors if different from ISO 13623;
h) pipeline operating conditions;
i) mechanical property requirements at the maximum design temperature;
j) requirements for proof, burst, or hydrostatic testing;
k) activities for witnessing and approval by purchaser;
l) coating or painting requirements;
m) marking requirements where different from this part of ISO 15590;
n) packaging and shipping instructions;
o) third-party inspection organization;
p) ISO 10474 standard designation of inspection document required;
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ISO 15590-2:2003(E)
q) requirements for format and additional content of the inspection document;
r) whether testing of welding procedures, welders, or welding operators specific to the order is required;
s) whether approval of the MPS is to be by review of previous production data or by testing;
t) PWHT (see 9.1);
u) HIC testing (see 9.4.7);
v) SCC testing (see 9.4.8).
8 Manufacturing
8.1 Manufacturing procedure specification
Fittings shall be manufactured in accordance with a documented MPS. If specified by the purchaser,
manufacturing shall not proceed until the MPS has been accepted by the purchaser.
The MPS shall specify the following items:
a) for the starting material:
1) name of manufacturer,
2) steel-making process,
3) steel grade,
4) product form and dimensions,
5) chemical composition, including that of the weld seam,
6) welding procedure specification;
b) for fitting manufacture:
1) forming procedure,
2) welding procedure specification and approval record,
3) heat treatment procedure including thermal cycles,
4) machining requirements,
5) inspection and test requirements,
6) traceability;
c) additional requirements such as end preparation, coating, and marking.
An approval of the MPS may be required, either by review of the manufacturer’s previous production data or
by performance of the mandatory tests listed in Table 2, at the beginning of production.
8.2 Starting material
The starting material for forming into fittings shall be blooms, billets, slabs, forging quality bar, plate,
fusion-welded with filler metal or seamless tubular products, produced from fully-killed steels.
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ISO 15590-2:2003(E)
High-frequency welded (HFW) and helical-seam submerged-arc welding (SAWH) pipes shall not be used.
8.3 Fitting manufacture
8.3.1 Forming
All forming operations shall be performed in accordance with the MPS.
8.3.2 Welding
Welding operations shall be conducted in accordance with those elements of ISO 3834-2 decided by
agreement and the requirements of this part of ISO 15590.
Welding and repair welding shall be performed in accordance with procedures qualified in accordance with
ASME IX or EN 288–3. Welders and welding operators shall be qualified in accordance with ASME IX or
EN 287–1.
Acceptance criteria for all tests shall be as specified in Clause 9.
Where practicable, longitudinal butt welds should be double-sided. Backing rings shall not be used. All welds
shall have complete penetration and shall be finished in accordance with Clause 9.
Temporary welded attachments shall be removed, where possible, before heat treatment and the weld area
shall be treated in accordance with 9.5.3.4 and 9.5.3.5.
Fittings shall not contain girth welds.
All welds that will remain in the fitting shall be heat-treated in accordance with 8.3.3.
8.3.3 Heat treatment
All fittings shall be normalized, normalized and tempered, or quenched and tempered after welding and/or
forming. The heat treatment shall be performed in accordance with a documented procedure. The procedure
shall define the following parameters, where appropriate, for the type of heat treatment:
a) heating schedule;
b) soaking temperature;
c) soaking time;
d) cooling schedule;
e) quenching temperature;
f) quenching medium, including commencing and final medium temperature.
A record shall be maintained of each heat treatment. When submission of the heat treatment record is
specified, it shall be included in the inspection document.
The tolerances on specified nominal values of soaking temperature and soaking time shall be ± 15 °C and
+ 20 %, respectively.
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ISO 15590-2:2003(E)
8.3.4 End preparation
For unequal wall thicknesses, the joint design shall be as shown in Figure 1.
Dimensions in millimetres
a) Internal offset
b) External offset
c) Combination
If the SMYSs of the sections to be joined are not equal, the minimum thickness, t , shall be not less than t
D
times the ratio of the SMYS of the pipe and fitting, but shall not exceed 1,5t.
a
There is no restriction on the minimum angle if the materials joined have equal SMYS.
Figure 1 — Bevel designs for unequal wall thicknesses
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ISO 15590-2:2003(E)
9 Testing and inspection
9.1 General requirements
Testing and inspection shall be carried out on fittings after final heat treatment.
If the pipeline installation techniques will require post-weld heat treatment (PWHT) of the fitting, additional
testing may be requested to demonstrate that the mechanical properties of the fitting are also achieved after
PWHT. Details of the PWHT thermal cycle to be used during pipeline installation shall be specified. The test
requirements and acceptance criteria shall be by agreement.
Where the procedure requirements of 8.3.3 are not met, test pieces shall be taken from each heat treatment
batch.
9.2 Extent of testing and inspection
The testing and inspection to be performed during qualification and production shall be as summarized in
Table 2 for each fitting class.
Production testing shall be performed at the minimum frequency specified in Table 3.
Test pieces for mechanical testing shall be taken from one or more of the following:
extension lengths, formed and heat-treated as part of the fitting and/or test piece attached to the fitting;
starting material which has been subjected to the same forging reduction and heat treatment as the
proposed fitting;
a fitting.
Locations for the test pieces to be taken from a fitting shall be established by agreement. The sample of
starting material shall be heat-treated with or as part of the fittings in the same heat treatment batch in
accordance with ISO 377:1997, Clause 5.
Fittings heat-treated within the tolerance requirements of 8.3.3 may be considered as being in the same heat
treatment condition.
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ISO 15590-2:2003(E)
Table 2 — Summary of testing and inspection requirements
Clause
number
Test Class A Class B Class C specifying
acceptance
criteria
Chemical analysis Chemical composition M M M 9.3
Physical tests Tensile – base metal M M M 9.4.2.3
a a a
Transverse weld tensile 9.4.2.3
M M M
Impact – fitting body O M M 9.4.3.3
Impact – weld seam O M M 9.4.3.3
Through-thickness hardness O M M 9.4.4.2
Surface hardness O O O 9.4.5
b
Metallography Q Q 9.4.6.2
Q
c,d
HIC N N 9.4.7
O
c,d
SSC N N 9.4.8
O
CTOD N N O 9.4.9
Guided bend (weld seam) Q Q Q 9.4.10.3
NDT Visual inspection M M M 9.5.3
End preparation (MT or PT) M M M 9.5.4
Fitting end (UT) N M M 9.5.4
d
M M M 9.5.5
Weld seam (RT or UT)
e
O O O 9.5.7
Fitting body (UT or MT)
Residual magnetism O M M 9.5.8
Dimensions Wall thickness M M M 9.6
Inside diameter at ends M M M 9.6
Out-of-roundness at ends M M M 9.6
Specific dimensions M M M 9.6
NOTE The abbreviations mean as follows:
M = Requirement mandatory in production
N = Not required
O = Requirement for test or inspection at the purchaser’s option
Q = Required for approval of the welding procedure only, otherwise at the purchaser’s option
a
May be omitted for fittings with D < 210 mm.
b
Production test which shall be performed for fittings intended for sour service.
c
Option need not be considered for fittings intended for non-sour service. If applied, this testing may be performed as part of the
MPS qualification testing.
d
May be carried out on the starting material by agreement.
e
By agreement.
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ISO 15590-2:2003(E)
Table 3 — Extent of testing and inspection
Type of test Number of tests
Chemical composition One per heat
Tensile — base metal One per test unit
Transverse weld tensile One per test unit
Impact — base metal One set per test unit
Impact — weld seam 37 mm thickness and above: two sets per test unit
less than 37 mm: 1 set per test unit
Through-thickness hardness One per test unit
Surface hardness By agreement
Metallography By agreement
HIC By agreement
SSC By agreement
CTOD By agreement
Guided bend (weld seam) Two per qualification test
a
NDT
Every fitting
Dimensional inspection Every fitting
a
Except for determining residual magneti
...
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