SIST EN ISO 13626:2005

Petroleum and natural gas industries - Drilling and production equipment - Drilling and well-servicing structures (ISO 13626:2003)

ISO 13626:2003 specifies requirements and gives recommendations for suitable steel structures for drilling and well-servicing operations in the petroleum industry, provides a uniform method of rating the structures, and provides two product specification levels.
ISO 13626:2003 is applicable to all new designs of all standard steel derricks, special steel derricks, portable masts and substructures.
Annex A provides a number of standard supplementary requirements which apply only if specified by the purchaser.

Erdöl- und Erdgasindustrie - Bohr- und Förderanlagen - Bohrungen und Bohrloch-Aufbauten (ISO 13626:2003)

Industries du pétrole et du gaz naturel - Equipement de forage et de production - Structures de forage et d'entretien des puits (ISO 13626:2003)

Petroleum and natural gas industries - Drilling and production equipment - Drilling and well-servicing structures (ISO 13626:2003)

General Information

• Status: Published
• Publication Date: 28-Feb-2005
• ICS: 75.180.10 - Exploratory, drilling and extraction equipment
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Mar-2005
• Due Date: 01-Mar-2005
• Completion Date: 01-Mar-2005
• Ref Project: EN ISO 13626:2004 - Petroleum and natural gas industries - Drilling and production equipment - Drilling and well-servicing structures (ISO 13626:2003)

Overview

EN ISO 13626:2004 (ISO 13626:2003) applies to the petroleum and natural gas industries and specifies requirements and recommendations for steel drilling and well‑servicing structures. The standard covers design, ratings, materials, fabrication, welding, quality control and documentation for new designs of standard steel derricks, special steel derricks, portable masts and substructures. It provides a uniform method of rating these structures and defines two product specification levels. Annex A lists supplementary purchaser‑specified requirements.

Key topics and technical requirements

• Scope and applicability: Applies to all new designs of standard and special steel derricks, portable masts and substructures used in drilling and well‑servicing operations.
• Product specification levels: Two product specification levels (PSLs) give manufacturers and purchasers options for required detail and testing.
• Marking and information: Nameplate and documentation requirements for derricks, masts, substructures and crown block assemblies to ensure traceability and safe operation.
• Standard ratings and design loading: Uniform rating methods for static and dynamic conditions; design loading considerations include wind, dynamic loading (e.g., floating hull motion), and earthquake effects.
• Materials and welding: Material selection, mechanical property requirements, material qualification and specific welding provisions including qualifications, consumable control and post‑weld heat treatment where applicable.
• Quality control and testing: Inspection, non‑destructive examination (NDE), dimensional verification, testing, workmanship standards and manufacturer traceability.
• Documentation and verification: Requirements for documentation to be retained by the manufacturer and delivered with equipment; design verification procedures.
• Annexes: Normative Annex A for supplementary purchaser requirements and Annex B containing standard derrick illustrations/details.

Practical applications and users

EN ISO 13626:2004 is used to specify, design, fabricate, inspect and purchase safe, fit‑for‑purpose drilling and well‑servicing structures. Typical users include:

• Drilling and well‑servicing equipment manufacturers and fabricators
• Drilling contractors and rig operators procuring derricks, masts and substructures
• Structural and mechanical engineers performing design and verification
• Quality assurance, inspection and NDE personnel
• Purchasers and project engineers who specify product specification levels and Annex A options
• Certification bodies and regulatory authorities referencing harmonized European (CEN) adoption

Related standards

• ISO 13535 (Hoisting equipment) - referenced normative standard for related hoisting equipment design and safety
• ISO/TC 67 publications and other CEN/TC 12 documents governing petroleum industry equipment

EN ISO 13626:2004 is valuable for ensuring consistent safety, mechanical performance, quality control and purchaser–manufacturer clarity when specifying drilling and well‑servicing structures in the petroleum and natural gas industries.

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2005
Petroleum and natural gas industries - Drilling and production equipment - Drilling
and well-servicing structures (ISO 13626:2003)
Petroleum and natural gas industries - Drilling and production equipment - Drilling and
well-servicing structures (ISO 13626:2003)
Erdöl- und Erdgasindustrie - Bohr- und Förderanlagen - Bohrungen und Bohrloch-
Aufbauten (ISO 13626:2003)
Industries du pétrole et du gaz naturel - Equipement de forage et de production -
Structures de forage et d'entretien des puits (ISO 13626:2003)
Ta slovenski standard je istoveten z: EN ISO 13626:2004
ICS:
75.180.10 Oprema za raziskovanje in Exploratory and extraction
odkopavanje equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 13626
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2004
ICS 75.180.10
English version
Petroleum and natural gas industries - Drilling and production
equipment - Drilling and well-servicing structures (ISO
13626:2003)
Industries du pétrole et du gaz naturel - Equipement de Erdöl- und Erdgasindustrie - Bohr- und Dörderanlagen -
forage et de production - Structures de forage et d'entretien Anforderungen an Bohrungen und Bohrloch-Aufbauten
des puits (ISO 13626:2003) (ISO 13626:2003)
This European Standard was approved by CEN on 30 September 2004.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, 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
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 13626:2004: E
worldwide for CEN national Members.

Foreword
The text of ISO 13626:2003 has been prepared by Technical Committee ISO/TC 67 "Materials,
equipment and offshore structures for petroleum and natural gas industries" of the International
Organization for Standardization (ISO) and has been taken over as EN ISO 13626:2004 by
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 April 2005, and conflicting national
standards shall be withdrawn at the latest by April 2005.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Endorsement notice
The text of ISO 13626:2003 has been approved by CEN as EN ISO 13626:2004 without any
modifications.
NOTE Normative references to International Standards are listed in annex ZA (normative).

Annex ZA
(normative)
Normative references to international publications
with their relevant European publications

This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of
any of these publications apply to this European Standard only when incorporated in it by
amendment or revision. For undated references the latest edition of the publication referred to
applies (including amendments).

NOTE Where an International Publication has been modified by common modifications, indicated
by (mod.), the relevant EN/HD applies.

Publication Year Title EN Year

ISO 13535 2000 Petroleum and natural gas EN ISO 13535 2000
industries - Drilling and production
equipment - Hoisting equipment

INTERNATIONAL ISO
STANDARD 13626
First edition
2003-11-01
Petroleum and natural gas industries —
Drilling and production equipment —
Drilling and well-servicing structures
Industries du pétrole et du gaz naturel — Équipement de forage et de
production — Structures de forage et d'entretien des puits

Reference number
ISO 13626:2003(E)
©
ISO 2003
ISO 13626:2003(E)
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ii © ISO 2003 — All rights reserved

ISO 13626:2003(E)
Contents Page
Foreword. v
Introduction . vi
1 Scope. 1
2 Normative references . 1
3 Terms and definitions. 2
4 Product specification levels. 4
5 Marking and information . 4
5.1 Nameplate . 4
5.2 Derrick and mast nameplate information . 4
5.3 Substructure nameplate information . 5
5.4 Crown block assembly nameplate information (required only for crown block assemblies
for use with derricks). 6
6 Standard ratings. 6
6.1 General. 6
6.2 Derrick — Stationary base . 6
6.3 Mast with guy lines . 6
6.4 Mast without guy lines. 7
6.5 Derrick and mast under dynamic conditions. 7
6.6 Substructure. 7
6.7 Substructure under dynamic conditions. 7
6.8 Crown block assembly . 8
7 Design loading . 8
7.1 General. 8
7.2 Derrick (stationary base). 8
7.3 Mast with guy lines . 9
7.4 Mast without guy lines. 10
7.5 Derrick and mast under dynamic conditions. 10
7.6 Substructure. 11
7.7 Substructure under dynamic conditions. 11
7.8 Guide tracks and dollies. 11
7.9 Crown block assemblies . 11
8 Design specification . 11
8.1 Allowable stresses. 11
8.2 Wind. 12
8.3 Dynamic loading (induced by floating hull motion) . 15
8.4 Earthquake. 16
8.5 Design verification . 16
9 Materials. 16
9.1 General. 16
9.2 Written specifications. 17
9.3 Mechanical properties . 17
9.4 Material qualification . 17
9.5 Material manufacture . 17
9.6 Bolts . 17
9.7 Wire rope. 17
10 Welding requirements . 18
10.1 General. 18
ISO 13626:2003(E)
10.2 Welding qualifications .18
10.3 Written documentation .18
10.4 Control of consumables .18
10.5 Weld properties .18
10.6 Post-weld heat treatment.18
10.7 Quality control requirements .18
10.8 Specific requirement — repair welds .19
11 Quality control .19
11.1 General .19
11.2 Quality control personnel qualifications .19
11.3 Measuring and test equipment .19
11.4 Non-destructive examination.20
11.5 Dimensional verification.21
11.6 Workmanship and finishing .21
11.7 Purchaser's inspection and rejection .21
11.8 Testing.22
11.9 Traceability.22
12 Documentation .23
12.1 General .23
12.2 Documentation to be kept by the manufacturer .23
12.3 Documentation to be delivered with equipment .24
Annex A (normative) Supplementary requirements.25
Annex B (normative) Standard derricks.27
Bibliography.31

iv © ISO 2003 — All rights reserved

ISO 13626:2003(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 13626 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.
ISO 13626:2003(E)
Introduction
This International Standard is based on API Spec 4F, second edition, June 1995.

vi © ISO 2003 — All rights reserved

INTERNATIONAL STANDARD ISO 13626:2003(E)

Petroleum and natural gas industries — Drilling and production
equipment — Drilling and well-servicing structures
1 Scope
This International Standard specifies requirements and gives recommendations for suitable steel structures for
drilling and well-servicing operations in the petroleum industry, provides a uniform method of rating the
structures, and provides two product specification levels.
This International Standard is applicable to all new designs of all standard steel derricks, special steel derricks,
portable masts and substructures.
Annex A provides a number of standard supplementary requirements which apply only if specified by the
purchaser.
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 9712, Non-destructive testing — Qualification and certification of personnel
ISO 13535, Petroleum and natural gas industries — Drilling and production equipment — Hoisting equipment
ISO 10425, Steel wire ropes for the petroleum and natural gas industries — Minimum requirements and terms
of acceptance
1)
AISC 335, 1989, Specification for structural steel buildings, allowable stress design and plastic design
2)
API RP 2A-WSD, Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms —
Working Stress Design
API Spec 8A, Specification for Drilling and Production Hoisting Equipment
API RP 9B, Recommended Practice on Application, Care and Use of Wire Rope for Oilfield Service
3)
ASTM A 370, Standard Test Methods and Definitions for Mechanical Testing of Steel Products
ASTM A 578/A 578M, Standard Specification for Straight-Beam Ultrasonic Examination of Plain and Clad
Steel Plates for Special Applications
4)
AWS D1.1/D1.1M:2002, Structural Welding Code — Steel

1) American Institute of Steel Construction, 1 East Wacker Drive, Suite 3100, Chicago, Illinois 60601.
2) American Petroleum Institute, 1220 L Street, Northwest, Washington, DC 20005-4070.
3) American Society for Testing and Materials, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, Pennsylvannia 19428-2959.
4) American Welding Society, Incorporated, 550 Northwest LeJeune Road, Box 351040, Miami, Florida 33135.
ISO 13626:2003(E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
angle of roll
angle of pitch
angle of movement to one side from vertical
3.2
critical component
component which is necessary to maintain stability of a structure and which resides within the primary load
paths of the structure when the structure is loaded under the design loadings of Clause 7
3.3
critical weld
weld which joins critical components
3.4
crown block assembly
stationary sheave or block assembly installed at the top of a derrick or mast
3.5
date of manufacture
date chosen by the manufacturer occurring between the initiation of manufacture and the delivery to the
purchaser
3.6
derrick
semipermanent structure, of square or rectangular cross-section, having members that are latticed or trussed
on all four sides
NOTE 1 This unit is assembled in the vertical or operation position, as it includes no erection mechanism.
NOTE 2 It may or may not be guyed.
3.7
design load
force or combination of forces which a structure is designed to withstand without exceeding the allowable
stress in any member
3.8
dynamic loading
loading imposed upon a structure as a result of motion
3.9
erection load
load produced in the mast and its supporting structure during its raising and lowering, or in the substructure
during its raising and lowering
3.10
guide track and dollies
equipment used to hold the travelling equipment in correct position relative to the derrick during various
operations
NOTE A retractable dolly is used move the travelling equipment horizontally between the drilling position and the
retracted position.
2 © ISO 2003 — All rights reserved

ISO 13626:2003(E)
3.11
guy line
wire rope with one end attached to the mast assembly and the other end attached to a suitable anchor to
provide structural and/or lateral support for a mast under design loading conditions
3.12
guying pattern
plan view showing the manufacturer's recommended locations for guy lines and their distance out to the
anchors with respect to the centreline of the well
3.13
height of derrick and mast without guy lines
minimum vertical distance from the top of the working floor to the bottom of the crown block support beams
3.14
height of mast with guy line
minimum vertical distance from the ground to the bottom of the crown block support beams
3.15
impact loading
loading resulting from near-instantaneous changes of forces
3.16
mast
structural tower composed of one or more sections assembled in a horizontal position near the ground and
then raised to the operating position
NOTE If the unit contains two or more sections, it may be telescoped or unfolded during the erection procedure.
3.17
mast set-up distance
distance from the centreline of the well to a designated point on the mast structure defined by a manufacturer
to assist in the set-up of the rig
3.18
maximum rated static hook load
load composed of the weight of the travelling equipment and a static load applied to the travelling equipment
NOTE It is the largest load that can be applied to the structure within the guidelines imposed by this International
Standard with a specified number of lines strung to the travelling block and in the absence of pipe setback, sucker rod or
wind loading. A designated location of the deadline anchor and drawworks is assumed.
3.19
maximum rated wind velocity
largest wind velocity the derrick or mast assembly is designed to resist for a specified design loading
NOTE Maximum rated wind velocity is specified at 10 m above the ground or water surface.
3.20
nominal wire rope assembly strength
nominal strength of the wire rope, multiplied by the efficiency of the end attachment in accordance with
API RP 9B
3.21
period
ττττ
〈of roll, pitch or heave〉 time required for a complete cycle
ISO 13626:2003(E)
3.22
pipe lean
angle between the vertical and a typical stand of pipe in the setback
3.23
product specification level
level of material and process controls placed upon the primary load-carrying components of the covered
equipment
3.24
racking platform
platform located at a distance above the working floor for laterally supporting the upper end of racked pipe
3.25
rated static rotary load
maximum weight which can be supported by the rotary-table support beams
3.26
rated setback load
maximum weight of tubular goods which can be supported by the substructure in the setback area
3.27
rod board
rod hanger
platform located at a distance above the working floor for supporting rods
3.28
substructure
any structure through which hook load, rotary load and/or setback load are transmitted
4 Product specification levels
This International Standard establishes requirements for two product specification levels (PSL) for drilling and
well-servicing structures which define two levels of technical and quality requirements. These requirements
reflect practices currently being implemented by a broad spectrum of the manufacturing industry. PSL 1
includes all the requirements of this International Standard unless specifically identified as PSL 2. PSL 2
includes all the requirements of PSL 1 plus additional requirements.
5 Marking and information
5.1 Nameplate
Drilling and well-servicing structures manufactured in accordance with this International Standard shall be
identified by a nameplate bearing at least the information specified in 5.2 to 5.4, including the units of
measurement where applicable. Markings shall be either raised or stamped. The nameplate shall be securely
affixed to the structure in a conspicuous place.
5.2 Derrick and mast nameplate information
The following information shall be provided:
a) manufacturer's name;
b) manufacturer's address;
c) date of manufacture, including month and year;
4 © ISO 2003 — All rights reserved

ISO 13626:2003(E)
d) serial number;
e) height;
f) maximum rated static hook load with guy lines, if applicable, for stated number of lines to travelling block;
g) maximum rated wind velocity with guy lines, if applicable, with rated capacity of pipe racked;
h) specification and edition of the specification under which the structure was designed and manufactured;
EXAMPLE ISO 13626:2003
i) manufacturer's guying diagram, if applicable;
j) the following text:
CAUTION — Acceleration, impact, setback and wind loads reduce the maximum rated static hook
load capacity.
k) manufacturer's load distribution diagram (may be placed in mast instructions);
l) graph plotting maximum allowable static hook load versus wind velocity as defined in 6.2 f) and 6.4 e);
m) mast set-up distance for mast with guy lines;
n) PSL 2, if applicable;
o) supplementary information as specified in the particular supplementary requirement (SR), if applicable
(see Annex A).
5.3 Substructure nameplate information
The following information shall be provided:
a) manufacturer's name;
b) manufacturer's address;
c) date of manufacture, including month and year;
d) serial number;
e) maximum rated static rotary capacity;
f) maximum rated pipe setback capacity;
g) maximum combined rated static rotary and rated setback capacity;
h) specification and edition of the specification under which the structure was designed and manufactured;
EXAMPLE ISO 13626:2003
i) PSL 2, if applicable;
j) supplementary information as specified in the particular supplementary requirement (SR), if applicable
(see Annex A).
ISO 13626:2003(E)
5.4 Crown block assembly nameplate information (required only for crown block assemblies
for use with derricks)
The following information shall be provided:
a) manufacturer's name;
b) manufacturer's address;
c) date of manufacture, including month and year;
d) serial number;
e) maximum rated static hook load;
f) specification and edition of the specification under which the structure was designed and manufactured;
EXAMPLE ISO 13626:2003
g) PSL 2, if applicable;
h) supplementary information as specified in the particular supplementary requirement (SR), if applicable
(see Annex A).
6 Standard ratings
6.1 General
Each structure shall be rated for the following applicable loading conditions. The structures shall be designed
to meet or exceed these conditions in accordance with applicable specifications set herein. The following
ratings do not include any allowance for impact. Acceleration, impact, setback and wind loads reduce the
rated static hook load capacity.
6.2 Derrick (stationary base)
The following loading conditions are applicable to the derrick (stationary base):
a) maximum rated static hook load for a specified number of lines strung to the travelling block;
b) maximum rated wind velocity, in metres per second, without full pipe setback;
c) maximum rated wind velocity, in metres per second, with full pipe setback;
d) maximum number of stands and size of pipe in full setback;
e) maximum rated gin pole capacity;
f) rated static hook load for wind velocities varying from zero to maximum rated wind velocity, with full rated
setback and with maximum number of lines to the travelling block.
6.3 Mast with guy lines
The following loading conditions are applicable to the mast with guy lines:
a) maximum rated static hook load capacity for a specified number of lines strung to the travelling block and
manufacturer's specified guying pattern;
6 © ISO 2003 — All rights reserved

ISO 13626:2003(E)
b) maximum rated wind velocity, in metres per second, without pipe setback;
c) maximum rated wind velocity, in metres per second, with full pipe setback;
d) maximum number of stands and size of pipe in full setback.
6.4 Mast without guy lines
The following loading conditions are applicable to the mast without guy lines:
a) maximum rated static hook load for a specified number of lines strung to the travelling block;
b) maximum rated wind velocity, in metres per second, without pipe setback;
c) maximum rated wind velocity, in metres per second, with full pipe setback;
d) maximum number of stands and size of pipe in full setback;
e) rated static hook load for wind velocities varying from zero to maximum rated wind velocity, with full rated
setback and with maximum number of lines to the travelling block.
6.5 Derrick and mast under dynamic conditions
The following loading conditions are applicable to the derrick and mast under dynamic conditions:
a) maximum rated static hook load for a specified number of lines to the travelling block;
b) hook load, wind load, vessel motions, and pipe setback in combination with each other for the following:
1) operating with partial setback;
2) running case;
3) waiting on weather;
4) survival;
5) in transit.
6.6 Substructure
The following loading conditions are applicable to the substructure:
a) maximum rated static hook load, if applicable;
b) maximum rated pipe setback load;
c) maximum rated static load on rotary table beams;
d) maximum rated combined load of setback and rotary table beams.
6.7 Substructure under dynamic conditions
The following loading conditions are applicable to the substructure under dynamic conditions:
a) maximum rated static hook load;
b) maximum rated pipe setback load;
ISO 13626:2003(E)
c) maximum rated load on rotary table beams;
d) maximum rated combined load of setback and rotary table beams;
e) all ratings per 6.5 b).
6.8 Crown block assembly
The following loading condition is applicable to the crown block assembly:
a) maximum rated static hook load for a specified number of lines strung to the travelling block.
7 Design loading
7.1 General
Each structure shall be designed for the following applicable loading conditions. The structure shall be
designed to meet or exceed these conditions in accordance with the applicable specifications set forth herein.
7.2 Derrick (stationary base)
The following loading conditions are applicable to the derrick (stationary base):
a) operating loads (no wind loads) composed of the following loads in combination:
1) maximum rated static hook load, in combination with fastline and deadline loads, for each applicable
string up condition;
2) dead load of derrick assembly;
b) wind load without pipe setback composed of the following loads in combination (standard derrick sizes
are defined in Annex B):
1) wind load on derrick, derived from maximum rated wind velocity without setback;
i) minimum wind velocity for standard derrick size 10 through size 18A is 48 m/s;
ii) minimum wind velocity for standard derrick size 19 through size 25 is 55 m/s;
2) dead load of derrick assembly;
c) wind load with rated pipe setback composed of the following loads in combination:
1) wind load on derrick derived from maximum rated wind velocity with setback of not less than 48 m/s;
2) dead load of derrick assembly;
3) horizontal load at racking platform, derived from maximum rated wind velocity with setback of not
less than 48 m/s acting on full pipe setback;
4) horizontal load at racking platform from pipe lean.
8 © ISO 2003 — All rights reserved

ISO 13626:2003(E)
7.3 Mast with guy lines
The following loading conditions are applicable to the mast with guy lines:
a) operating loads (no wind load) composed of the following loads in combination:
1) maximum rated static hook load, in combination with fastline and deadline loads, for each applicable
string-up condition;
2) dead load of mast assembly;
3) horizontal and vertical components of guy line loading;
b) wind load composed of the following loads in combination:
1) wind load on mast with setback, derived from a maximum rated wind velocity of not less than 31 m/s;
2) dead load of mast assembly;
3) horizontal loading at racking board, derived from a maximum rated wind velocity with setback of not
less than 31 m/s, acting on full pipe setback;
4) horizontal and vertical components of guy line loading;
5) horizontal and vertical loading at rod board, derived from a maximum rated wind velocity with setback
of not less than 31 m/s, acting on rods in conjunction with deadweight of rods;
c) wind load composed of the following loads in combination:
1) wind load on mast with setback, derived from a maximum rated wind velocity of not less than 31 m/s;
2) dead load of mast assembly;
3) horizontal loading at racking board, derived from a maximum rated wind velocity with setback of not
less than 31 m/s, acting on full pipe setback;
4) horizontal and vertical components of guy line loading;
d) wind load composed of the following loads in combination:
1) wind load on mast with setback, derived from a maximum rated wind velocity of not less than 31 m/s;
2) dead load of mast assembly;
3) horizontal and vertical components of guy line loading;
e) erection loads (zero wind conditions) composed of the following loads in combination:
1) forces applied to mast and supporting structure created by raising or lowering mast:
i) from the horizontal position to the operating position,
ii) to the horizontal position from the operating position;
2) dead load of mast assembly;
ISO 13626:2003(E)
f) guy line loading:
1) maximum horizontal and vertical reactions from conditions of load applied to guy line in 7.3 a)
through 7.3 e);
2) dead load of mast assembly;
3) initial tension in guy line, as specified by mast manufacturer.
7.4 Mast without guy lines
The following loading conditions are applicable to the mast without guy lines:
a) operating loads composed of the following loads in combination:
1) maximum rated static hook load, in combination with fastline and deadline loads, for each applicable
string-up condition;
2) dead load of mast assembly;
b) wind load without pipe setback composed of the following loads in combination:
1) wind loading on mast without setback, derived from a maximum rated wind velocity of not less than
48 m/s;
2) dead load of mast assembly;
c) wind load with pipe setback composed of the following loads in combination:
1) wind loading on mast with setback, derived from a maximum rated wind velocity of not less than
36 m/s;
2) dead load of mast assembly;
3) horizontal load at racking platform derived from a maximum rated wind velocity with setback of not
less than 36 m/s acting on pipe setback;
4) horizontal load at racking platform from pipe lean;
d) mast erection loads (zero wind load) composed of the following loads in combination:
1) forces applied to mast and supporting structure created by raising or lowering mast
i) from the horizontal position to the operating position,
ii) to the horizontal position from the operating position.
2) dead load of mast assembly;
e) mast-handling loads: mast assembly supported at its extreme ends.
7.5 Derrick and mast under dynamic conditions
All conditions listed under 6.5 shall be specified by the purchaser. Forces resulting from wind and vessel
motion shall be calculated in accordance with formulas specified in 8.2 and 8.3.
10 © ISO 2003 — All rights reserved

ISO 13626:2003(E)
7.6 Substructure
The following loading conditions are applicable to the substructure:
a) loads imposed by erection of mast, if applicable;
b) loads imposed by moving, skidding or erection, if applicable;
c) the substructure shall be designed for the following conditions:
1) maximum rated static rotary load;
2) maximum rated setback load;
3) maximum rated static hook load, in combination with fastline and deadline loads (where applicable);
4) maximum combined rated static hook and rated setback loads (where applicable);
5) maximum combined rated static rotary and rated setback loads;
6) wind loads resulting from maximum rated wind velocity acting from any direction on all exposed
elements with rated setback loads, if applicable. Wind pressures and resultant forces shall be
calculated in accordance with the equations and tables in 8.2. If a substructure is utilized to react guy
lines to the mast, these reactions from the guy lines shall be designed into the substructure;
7) dead load of all components in combination with each of the above.
7.7 Substructure under dynamic conditions
All conditions listed under 6.7 are to be specified by the purchaser. Forces resulting from wind and vessel
motion shall be calculated in accordance with formulas specified in 8.2 and 8.3.
7.8 Guide tracks and dollies
All loads imposed by the attached equipment under all environmental and operating conditions applicable to
the supporting derrick or mast.
7.9 Crown block assemblies
Maximum rated static hook load, in combination with fastline and deadline loads, for each applicable string-up
condition.
8 Design specification
8.1 Allowable stresses
8.1.1 General
The steel structures shall be designed in accordance with AISC 335, except as further specified in this
International Standard. The portion of AISC 335, Allowable Stress Design, commonly referred to as Elastic
Design, shall be used in determining allowable unit stresses. Use of Part 5, Chapter N — Plastic Design, is
not allowed. AISC 335 shall be used for determination of allowable unit stresses, except that current practice
and experience do not dictate the need to follow AISC 335 for “members and their connections subject to
fatigue loading” (Section K4), and for the consideration of secondary stresses.
ISO 13626:2003(E)
For the purposes of this International Standard, stresses in the individual members of a latticed or trussed
structure resulting from elastic deformations and rigidity of joints are defined as secondary stresses. These
secondary stresses may be taken to be the differences between stresses from an analysis assuming fully rigid
joints, with loads applied only at the joints, and those stresses from a similar analysis with pinned joints.
Stresses arising from eccentric joint connection, or from transverse loading of members between joints, or
from applied moments, shall be considered primary stresses.
Allowable unit stresses may be increased by 20 % when secondary stresses are computed and added to the
primary stresses in individual members. However, primary stresses shall not exceed the allowable unit stress.
Earthquake loading and the related allowable stresses are addressed specifically in 8.4.
8.1.2 Wind and dynamic stresses (induced by floating hull motion)
Allowable unit stresses may be increased one-third over basic allowable stresses as provided in 8.1.1 when
produced by wind or dynamic loading acting alone, or in combination with the design dead load and live load,
provided the required section computed on this basis is not less than required for the design dead and live
load and impact (if any), computed without the one-third increase.
The intent of this clause is to include dynamic loading due to floating hull motion, to the one-third increase in
allowable stress. It
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