Petroleum and natural gas industries - Drilling and production equipment - Marine drilling riser couplings (ISO 13625:2002)

ISO 13625:2002 specifies requirements and gives recommendations for the design, rating, manufacturing and testing of marine drilling riser couplings. Coupling capacity ratings are established to enable the grouping of coupling models according to their maximum stresses developed under specific levels of loading, regardless of manufacturer or method of make-up.

Erdöl-, und Erdgasindustrie - Bohr- und Förderanlagen - Auslegung, Leistungeinstufung und Prüfung von Kupplungen für Bohrförderanlagen auf See (ISO 13625:2002)

Industries du pétrole et du gaz naturel - Equipement de forage et de production - Connecteurs de tubes prolongateurs pour forages en mer (ISO 13625:2002)

Petroleum and natural gas industries - Drilling and production equipment - Marine drilling riser couplings (ISO 13625:2002)

General Information

Status
Published
Publication Date
30-Nov-2002
Current Stage
9093 - Decision to confirm - Review Enquiry
Completion Date
14-Mar-2009

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SLOVENSKI STANDARD
SIST EN ISO 13625:2004
01-maj-2004

Petroleum and natural gas industries - Drilling and production equipment - Marine

drilling riser couplings (ISO 13625:2002)

Petroleum and natural gas industries - Drilling and production equipment - Marine drilling

riser couplings (ISO 13625:2002)

Erdöl-, und Erdgasindustrie - Bohr- und Förderanlagen - Auslegung, Leistungeinstufung

und Prüfung von Kupplungen für Bohrförderanlagen auf See (ISO 13625:2002)

Industries du pétrole et du gaz naturel - Equipement de forage et de production -

Connecteurs de tubes prolongateurs pour forages en mer (ISO 13625:2002)
Ta slovenski standard je istoveten z: EN ISO 13625:2002
ICS:
75.180.10 Oprema za raziskovanje in Exploratory and extraction
odkopavanje equipment
SIST EN ISO 13625:2004 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 13625:2004
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SIST EN ISO 13625:2004
EUROPEAN STANDARD
EN ISO 13625
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2002
ICS 75.180.10
English version
Petroleum and natural gas industries - Drilling and production
equipment - Marine drilling riser couplings (ISO 13625:2002)
Industries du pétrole et du gaz naturel - Equipement de
forage et de production - Connecteurs de tubes
prolongateurs pour forages en mer (ISO 13625:2002)
This European Standard was approved by CEN on 27 November 2002.

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 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 Management Centre has the same status as the official

versions.

CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,

Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels

© 2002 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 13625:2002 E

worldwide for CEN national Members.
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SIST EN ISO 13625:2004
EN ISO 13625:2002 (E)
Foreword

This document (EN ISO 13625:2002) has been prepared by Technical Committee ISO/TC 67

"Materials, equipment and offshore structures for petroleum and natural gas industries" in

collaboration with Technical Committee CEN/TC 12 "Materials, equipment and offshore

structures for petroleum and natural gas industries", the secretariat of which is held by AFNOR.

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 June 2003, and conflicting national

standards shall be withdrawn at the latest by June 2003.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of

the following countries are bound to implement this European Standard: Austria, Belgium, Czech

Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg,

Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.

NOTE FROM CMC The foreword is susceptible to be amended on reception of the German

language version. The confirmed or amended foreword, and when appropriate, the normative

annex ZA for the references to international publications with their relevant European

publications will be circulated with the German version.
Endorsement notice

The text of ISO 13625:2002 has been approved by CEN as EN ISO 13625:2002 without any

modifications.
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SIST EN ISO 13625:2004
INTERNATIONAL ISO
STANDARD 13625
First edition
2002-12-01
Corrected version
2003-06-15
Petroleum and natural gas industries —
Drilling and production equipment —
Marine drilling riser couplings
Industries du pétrole et du gaz naturel — Équipement de forage et de
production — Connecteurs de tubes prolongateurs pour forages en mer
Reference number
ISO 13625:2002(E)
ISO 2002
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SIST EN ISO 13625:2004
ISO 13625:2002(E)
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© ISO 2002

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,

electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or

ISO's member body in the country of the requester.
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Published in Switzerland
ii © ISO 2002 – All rights reserved
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SIST EN ISO 13625:2004
ISO 13625:2002(E)
Contents Page

Foreword............................................................................................................................................................ iv

Introduction ........................................................................................................................................................ v

1 Scope...................................................................................................................................................... 1

2 Normative references........................................................................................................................... 1

3 Terms, definitions and abbreviations ................................................................................................. 2

3.1 Terms and definitions........................................................................................................................... 2

3.2 Abbreviations........................................................................................................................................ 4

4 Design.................................................................................................................................................... 4

4.1 Service classifications.......................................................................................................................... 4

4.2 Riser loading......................................................................................................................................... 5

4.3 Determination of stresses by analysis ............................................................................................... 5

4.4 Stress distribution verification test..................................................................................................... 6

4.5 Coupling design load............................................................................................................................ 6

4.6 Design for static loading ...................................................................................................................... 7

4.7 Stress amplification factor................................................................................................................... 7

4.8 Design documentation......................................................................................................................... 8

5 Material selection and welding ............................................................................................................ 8

5.1 Material selection.................................................................................................................................. 8

5.2 Welding................................................................................................................................................ 10

6 Dimensions and weights.................................................................................................................... 11

6.1 Coupling dimensions.......................................................................................................................... 11

6.2 Coupling weight.................................................................................................................................. 12

7 Quality control..................................................................................................................................... 12

7.1 General................................................................................................................................................. 12

7.2 Raw material conformance................................................................................................................ 12

7.3 Manufacturing conformance.............................................................................................................. 12

8 Testing.................................................................................................................................................. 16

8.1 Purpose................................................................................................................................................ 16

8.2 Design qualification tests .................................................................................................................. 16

9 Marking................................................................................................................................................ 16

9.1 Stamping.............................................................................................................................................. 16

9.2 Required information.......................................................................................................................... 16

10 Operation and maintenance manuals............................................................................................... 17

10.1 General................................................................................................................................................. 17

10.2 Equipment description....................................................................................................................... 17

10.3 Guidelines for coupling usage .......................................................................................................... 17

10.4 Maintenance instructions................................................................................................................... 17

Annex A (informative) Stress analysis ........................................................................................................... 18

Annex B (informative) Optional qualification tests ....................................................................................... 19

Annex C (normative) Design for static loading ............................................................................................. 20

Bibliography ..................................................................................................................................................... 25

© ISO 2002 – All rights reserved iii
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SIST EN ISO 13625:2004
ISO 13625:2002(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 13625 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures

for petroleum, petrochemical and natural gas industries, Subcommittee SC 4, Drilling and production

equipment.

This corrected version of ISO 13625:2002 incorporates correction of the French title.

iv © ISO 2002 – All rights reserved
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SIST EN ISO 13625:2004
ISO 13625:2002(E)
Introduction
1) [1]

This International Standard is based upon API Specification 16R, first edition, January 1997 .

Users of this International Standard should be aware that further or differing requirements could be needed for

individual applications. This International Standard is not intended to inhibit a vendor 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 vendor will need to identify any variations from this International Standard and provide details.

1) American Petroleum Institute, 1220 L Street NW, Washington D.C. 20005, USA.
© ISO 2002 – All rights reserved v
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SIST EN ISO 13625:2004
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SIST EN ISO 13625:2004
INTERNATIONAL STANDARD ISO 13625:2002(E)
Petroleum and natural gas industries — Drilling and production
equipment — Marine drilling riser couplings
1 Scope

This International Standard specifies requirements and gives recommendations for the design, rating,

manufacturing and testing of marine drilling riser couplings. Coupling capacity ratings are established to

enable the grouping of coupling models according to their maximum stresses developed under specific levels

of loading, regardless of manufacturer or method of make-up. This International Standard relates directly to

API RP 16Q, which provides guidelines for the design, selection, and operation of the marine drilling riser

system as a whole.
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, Steel — Charpy impact test (V-notch)
ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method
ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method

ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method (scales A, B, C, D, E, F, G,

H, K, N, T)
ISO 6892, Metallic materials — Tensile testing at ambient temperature

ISO 10423:2001, Petroleum and natural gas industries — Drilling and production equipment — Wellhead and

christmas tree equipment
ASME , Boiler and Pressure Vessel Code, Section V
ASME, Boiler and Pressure Vessel Code, Section VIII
ASTM E 94, Standard Guide for Radiographic Examination
ASTM E 165, Standard Test Method for Liquid Penetrant Examination
ASTM E 709, Standard Guide for Magnetic Particle Examination

ASTM E 747, Standard Practice for Design, Manufacture and Material Grouping Classification of Wire Image

Quality Indicators (IQI) Used for Radiology

2) American Society of Mechanical Engineers, 1950 Stemmons Freeway, Dallas, Texas 75207, USA.

3) American Society of Testing and Materials, 1916 Race Street, Philadelphia, Pennsylvania 19103-1187, USA.

© ISO 2002 – All rights reserved 1
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SIST EN ISO 13625:2004
ISO 13625:2002(E)
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
[2]

NOTE A comprehensive list of definitions pertaining to marine drilling riser systems is contained in API RP 16Q .

3.1.1
auxiliary line

external conduit (excluding choke and kill lines) arranged parallel to the riser main tube for enabling fluid flow

EXAMPLE Control system fluid line, buoyancy control line, mud boost line.
3.1.2
breech-block coupling

coupling which is engaged by partial rotation of one member into an interlock with another

3.1.3
buoyancy
devices added to the riser joints to reduce their submerged weight
3.1.4
choke and kill lines
C&K lines

external conduits, arranged parallel to the main tube, used for circulation of fluids to control well pressure

NOTE Choke and kill lines are primary pressure-containing members.
3.1.5
collet-type coupling
coupling having a slotted cylindrical element joint mating coupling members
3.1.6
dog-type coupling

coupling having dogs which act as wedges mechanically driven between the box and pin for engagement

3.1.7
flange-type coupling
coupling having two flanges joined by bolts
3.1.8
indication

visual sign of cracks, pits, or other abnormalities found during liquid penetrant and magnetic particle

examination
3.1.8.1
linear indication
indication in which the length is equal to or greater than three times its width
3.1.8.2
relevant indication
any indication with a major dimension over 1,6 mm (1/16 in)
3.1.8.3
rounded indication

indication that is circular or elliptical with its length less than three times the width

2 © ISO 2002 – All rights reserved
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SIST EN ISO 13625:2004
ISO 13625:2002(E)
3.1.9
marine riser coupling
means of quickly connecting and disconnecting riser joints

NOTE The coupling box or pin (depending on design type) provides a support for transmitting loads from the

suspended riser string to the riser-handling spider while running or retrieving the riser. Additionally, the coupling can

provide support for choke and kill and auxiliary lines, and load reaction for buoyancy.

3.1.10
marine drilling riser

tubular conduit serving as an extension of the well bore from the well control equipment on the wellhead at the

seafloor to a floating drilling rig
3.1.11
preload

compressive bearing load developed between box and pin members at their interface; this is accomplished by

elastic deformation induced during make-up of the coupling
3.1.12
rated load

nominal applied loading condition used during coupling design, analysis and testing, based on a maximum

anticipated service loading

NOTE Under the rated working load, no average section stress in the riser coupling exceeds allowable limits

established in this International Standard.
3.1.13
riser coupling box
female coupling member
3.1.14
riser joint

section of riser pipe having ends fitted with a box and a pin, typically including integral choke and kill and

auxiliary lines
3.1.15
riser main tube
basic pipe from which riser joints are fabricated
3.1.16
riser coupling pin
male coupling member
3.1.17
stress amplification factor
SAF
SAF

factor equal to the local peak alternating stress in a component (including welds) divided by the nominal

alternating stress in the pipe wall at the location of the component

NOTE This factor is used to account for the increase in the stresses caused by geometric stress amplifiers which

occur in riser components.
3.1.18
threaded coupling
coupling having matching threaded members to form engagement
© ISO 2002 – All rights reserved 3
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SIST EN ISO 13625:2004
ISO 13625:2002(E)
3.2 Abbreviations
The following abbreviations are used in this International Standard.
BOP Blowout preventer
C&K Choke and kill
LP Liquid penetrant
MP Magnetic particle
NDE Non-destructive examination
QTC Qualified test coupon
SAF Stress amplification factor
4 Design
4.1 Service classifications
4.1.1 Design information

The coupling manufacturer shall provide design information for each coupling size and model which defines

load capacity rating. These data are to be based on design load (see 4.5) and verified by testing (see 8.2).

4.1.2 Size

Riser couplings are categorized by riser main tube size . The riser pipe outer diameter and wall thickness

(or wall thickness range) for which the coupling is designed shall be documented.

4.1.3 Rated load

The rated loads listed in here provide a means of general classification of coupling models based on stress

magnitude caused by applied load. To qualify for a particular rated load, neither calculated nor measured

stresses in a coupling shall exceed the allowable stress limits of the coupling material when subjected to the

rated load. The allowable material stresses are established in 4.6.
The rated loads are as follows:
a) 2 220 kN (500 000 lbf);
b) 4 450 kN (1 000 000 lbf);
c) 5 560 kN (1 250 000 lbf);
d) 6 670 kN (1 500 000 lbf);
e) 8 900 kN (2 000 000 lbf);
f) 11 120 kN (2 500 000 lbf);
g) 13 350 kN (3 000 000 lbf);
h) 15 570 kN (3 500 000 lbf).
4 © ISO 2002 – All rights reserved
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SIST EN ISO 13625:2004
ISO 13625:2002(E)
4.1.4 Stress amplification factor

The calculated SAF values for the coupling shall be documented at the pipe-to-coupling weld and at the

locations of highest stress in the pin and box. SAF is a function of pipe size, and wall thickness. It is calculated

as follows:
LPA
K =
SAF
NAS
where
σ is local peak alternating stress;
LPA
σ is nominal alternating stress in pipe.
NAS
4.1.5 Rated working pressure

Riser couplings shall be designed to provide a pressure seal between joints. The manufacturer shall

document the rated internal working pressure for the coupling design.
4.2 Riser loading
4.2.1 General

A drilling riser's ability to resist environmental loading depends primarily on tension. Environmental loading

includes the hydrodynamic forces of current and waves and the motions induced by the floating vessel's

dynamic response to waves and wind.

The determination of a riser's response to the environmental loading and determination of the mechanical

loads acting upon, and developed within, the riser require specialized computer modelling and analysis. (For

[2]

the general procedure used to determine riser system design loads and responses, see API RP 16Q .

Additional sources of applied load that are not included in the rated load may significantly affect the coupling

design and shall be included in design calculations.
4.2.2 Loads induced by choke and kill and auxiliary lines

Riser couplings typically provide support for choke and kill and auxiliary lines. This support constrains the lines

to approximate the curvature of the riser pipe. Loads can be induced on the coupling from pressure in the

lines, imposed deflections on the lines and the weight of the lines. The manufacturer shall document those

loads induced by choke and kill and auxiliary lines for which the coupling has been designed.

4.2.3 Loads induced by buoyancy

Riser couplings may provide support for buoyancy, which induces loads on the couplings. The manufacturer

shall document the buoyancy thrust loads for which the coupling has been designed.

4.2.4 Loads induced during handling

Temporary loads are induced by suspending the riser from the handling tool or spider or both. The

manufacturer shall document the riser handling loads for which the coupling is designed and how these loads

are applied.
4.3 Determination of stresses by analysis

Design of riser couplings for static loading (see 4.6) and determination of the stress amplification factors (see

4.7) require detailed knowledge of the stress distribution in the coupling. This information is acquired by finite

element analysis and subsequently validated by prototype strain gauge testing. A finite element analysis of the

© ISO 2002 – All rights reserved 5
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SIST EN ISO 13625:2004
ISO 13625:2002(E)

riser coupling shall be performed and documented. The analysis shall provide accurate or conservative peak

stresses, and shall include any deleterious effects of loss of preload from wear, friction and manufacturing

tolerances. Suggestions for the analysis can be found in Annex A. The following shall be documented and

included in the analysis:
a) hardware and software used to perform the analysis;
b) grid size;
c) applied loads;
d) preload losses;
e) material considerations.
4.4 Stress distribution verification test

After completion of the design studies, a prototype (or multiple prototypes) of the riser coupling shall be tested

to verify the stress analysis. The testing has two primary objectives: to verify any assumptions which were

made about preloading, separation behaviour and friction coefficients, and to substantiate the analytical stress

predictions.

Strain gauge data shall be used to measure preload stresses as they relate to make-up load or displacement.

Friction coefficients shall be varied (including at least two values) in order to establish sensitivity.

The coupling design load shall be applied in order to verify any assumption made in the analysis regarding

separation.

Strain gauges shall be placed as near as physically possible to at least five of the most highly stressed

regions, as predicted by the finite element analyses performed in accordance with 4.3, and in five locations

away from stress concentrations. Rosettes shall be used. All strain gauge readings and the associated loading

conditions shall be recorded such that they may be retained as part of the coupling design documentation.

Normal design qualification tests may be performed simultaneously with this stress distribution verification

testing (see 8.2).

NOTE It is often difficult to acquire sufficient strain data to totally correlate with the analytical results. High-stress

areas may be inaccessible and are sometimes so small that a strain gauge gives an average rather than the peak value.

The testing serves to verify the pattern of strain in regions surrounding the critical points.

4.5 Coupling design load

The coupling design load represents the maximum load-carrying capacity of the coupling. The manufacturer

shall establish the design load for each coupling design, based on the methods and criteria given in this

International Standard. Neither calculated nor measured stresses in a coupling shall exceed the allowable

stress limits of the coupling material when subjected to the design load. The allowable material stresses are

established in 4.6. The coupling’s rated load (see 4.1.3) shall be less than or equal to the coupling’s design

load.

For simplicity, the design loading condition is taken to be axisymmetric tension. In using this simplification,

riser bending moment is converted to equivalent tension, T . The coupling design load can be specified

either as an axisymmetric tension of magnitude, T , or it may be considered to be any combination of

design
tension (T) and bending moment (M) so that
32td( −t)
TA+=T+M =T+T=T (2)
EQ design
dd−−(2t)
6 © ISO 2002 – All rights reserved
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SIST EN ISO 13625:2004
ISO 13625:2002(E)
where
c is the mean radius of riser pipe;
I is the moment of inertia of riser pipe;
A is the cross-sectional area of riser pipe;
d is the outside diameter of riser pipe;
t is the wall thickness of riser pipe.

Using this relationship, the maximum calculated riser pipe stress at the middle of the pipe wall caused by pure

bending is treated in the same manner as that caused by pure tension. To classify a particular coupling

design, only the axisymmetric tensile load (T ) case need be considered.
design
While the coupling design load provides a means of grouping coupling models reg
...

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