prEN ISO 10437

SLOVENSKI STANDARD
01-november-2009
3HWURNHPLþQDLQGXVWULMDWHULQGXVWULMD]DSUHGHODYRQDIWHLQ]HPHOMVNHJDSOLQD
3DUQHWXUELQH8SRUDED]DSRVHEQHQDPHQH,62',6
Petroleum, petrochemical and natural gas industries - Steam turbines - Special-purpose
applications (ISO/DIS 10437:2009)
Erdöl-, petrochemische und Erdgasindustrie - Dampfturbinen - Spezial-Einsatzbereiche
(ISO/DIS 10437:2009)
Industries du pétrole, de la pétrochimie et du gaz naturel - Turbines à vapeur - Usage
spécial (ISO/DIS 10437:2009)
Ta slovenski standard je istoveten z: prEN ISO 10437
ICS:
27.040 Plinske in parne turbine. Gas and steam turbines.
Parni stroji Steam engines
75.180.20 Predelovalna oprema Processing equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
DRAFT
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2009
ICS 27.040; 75.180.20 Will supersede EN ISO 10437:2003
English Version
Petroleum, petrochemical and natural gas industries - Steam
turbines - Special-purpose applications (ISO/DIS 10437:2009)
Industries du pétrole, de la pétrochimie et du gaz naturel - Erdöl-, petrochemische und Erdgasindustrie -
Turbines à vapeur - Usage spécial (ISO/DIS 10437:2009) Dampfturbinen - Spezial-Einsatzbereiche (ISO/DIS
10437:2009)
This draft European Standard is submitted to CEN members for parallel enquiry. It has been drawn up by the Technical Committee
CEN/TC 12.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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 Management Centre has the
same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN ISO 10437:2009: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (prEN ISO 10437:2009) 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, petrochemical and
natural gas industries” the secretariat of which is held by AFNOR.
This document is currently submitted to the parallel Enquiry.
This document will supersede EN ISO 10437:2003.
Endorsement notice
The text of ISO/DIS 10437:2009 has been approved by CEN as a prEN ISO 10437:2009 without any
modification.
DRAFT INTERNATIONAL STANDARD ISO/DIS 10437
ISO/TC 67/SC 6 Secretariat: AFNOR
Voting begins on: Voting terminates on:
2009-09-17 2010-02-17
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION
Petroleum, petrochemical and natural gas industries — Steam
turbines — Special-purpose applications
Industries du pétrole, de la pétrochimie et du gaz naturel — Turbines à vapeur — Usage spécial
[Revision of second edition (ISO 10437:2003)]
ICS 27.040; 75.180.20
ISO/CEN PARALLEL PROCESSING
This draft has been developed within the International Organization for Standardization (ISO), and
processed under the ISO-lead mode of collaboration as defined in the Vienna Agreement.
This draft is hereby submitted to the ISO member bodies and to the CEN member bodies for a parallel
five-month enquiry.
Should this draft be accepted, a final draft, established on the basis of comments received, will be
submitted to a parallel two-month approval vote in ISO and formal vote in CEN.
In accordance with the provisions of Council Resolution 15/1993 this document is circulated in
the English language only.
Conformément aux dispositions de la Résolution du Conseil 15/1993, ce document est distribué
en version anglaise seulement.
To expedite distribution, this document is circulated as received from the committee secretariat.
ISO Central Secretariat work of editing and text composition will be undertaken at publication
stage.
Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.
THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE
REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION.
©
International Organization for Standardization, 2009

ISO/DIS 10437
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall
not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the
unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as permitted
under the applicable laws of the user's country, neither this ISO draft nor any extract from it may be
reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, photocopying,
recording or otherwise, without prior written permission being secured.
Requests for permission to reproduce should be addressed to either ISO at the address below or ISO's
member body in the country of the requester.
ISO copyright office
Case postale 56  CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.
©
ii ISO 2009 – All rights reserved

ISO/DIS 10437
Contents Page
Foreword.vi
Introduction.vii
1 Scope.1
2 Normative references .1
3 Terms and definitions .4
4 General. 10
4.1 Unit Responsibility . 10
4.2 Dimensions. 10
4.3 Unit Conversion . 10
4.4 Nomenclature. 10
4.5 Conflicting requirements . 10
5 Statutory requirements . 10
6 Basic design. 10
6.1 General. 10
6.2 Nameplates and rotation arrows. 13
7 Casings. 14
7.1 Pressure casings . 14
7.2 Casing connections. 16
7.3 Internal stationary components . 18
7.4 External forces and moments . 18
8 Rotating elements. 19
8.1 General. 19
8.2 Shafts. 19
8.3 Blading. 20
8.4 Speed-sensing element. 21
9 Rotor dynamics. 21
9.1 General. 21
9.2 Lateral analysis. 22
9.3 Stability Analysis . 30
9.4 Unbalanced rotor response verification test . 33
9.5 Additional testing. 34
9.6 Torsional analysis. 35
9.7 Vibration and balancing . 35
10 Bearings bearing housings, and seals. 40
10.1 Bearings – General . 40
10.2 Radial bearings . 40
10.3 Thrust bearings and collars. 40
10.4 Bearing housing. 41
10.5 Grounding. 42
10.6 Shaft seals. 42
11 Materials . 42
11.1 General. 42
11.2 Castings. 44
11.3 Welding. 45
12 Controls and instrumentation . 46
12.1 General. 46
ISO/DIS 10437
12.2 Turbine governing system .46
12.3 Turbine shutdown system.49
12.4 Other alarms and shutdowns.53
12.5 Instrument and control panels.55
12.6 Local instrumentation.55
13 Electrical systems .55
14 Piping and appurtenances .56
14.1 General .56
14.2 Oil piping .56
14.3 Instrument piping .56
14.4 Steam piping .56
15 Accessories .58
15.1 Couplings and guards.58
15.2 Mounting plates .58
15.3 Relief valves.62
15.4 Lubrication and control-oil system .62
15.5 Gland vacuum systems .63
15.6 Insulation and jacketing.63
15.7 Enclosures .63
15.8 Turning gear.65
15.9 Special tools .66
16 Inspection, testing and preparation for shipment .66
16.1 General .66
16.2 Inspection.66
16.3 Testing.68
16.4 Preparation for shipment.72
17 Vendor’s information .74
17.1 General .74
17.2 Proposals .75
17.3 Contract data .77
Annex A (informative) Typical datasheets.79
Annex B (informative) Steam turbine nomenclature .101
Annex C (normative) Procedures for determining residual unbalance .103
C.1 Scope.103
C.2 Terms and definitions .103
C.3 Maximum allowable residual unbalance.103
C.4 Residual unbalance check .103
Annex D (informative) Calculation of the maximum rotor speed during an overspeed trip .109
D.1 Scope.109
D.2 Calculations in SI units.110
D.3 Calculations in US Customary units .111
Annex E (informative) Mounting Plate Arrangements.115
Annex F (informative) Gland sealing and leak-off system.119
Annex G (informative) Typical inspection of components .122
Annex H (informative) Inspector's checklist .123
Annex I (informative) Vendor drawing and data requirements (VDDR).125
I.1 Example VDDR form.125
I.2 Description.129
Annex J (informative) Typical material specifications .139
Bibliography.142

iv © ISO 2009 – All rights reserved

ISO/DIS 10437
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 10437 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures
for petroleum and natural gas industries, Subcommittee SC 6, Processing equipment and systems.
This third edition cancels and replaces the second edition (ISO 10437:2003), which has been technically
revised.
ISO/DIS 10437
Introduction
Users of this International Standard should be aware that further or differing requirements may 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
may be particularly appropriate where there is innovative or developing technology. Where an alternative is
offered, the vendor should identify any variations from this International Standard and provide details.
This International Standard requires the purchaser to specify certain details and features.
A bullet (z) at the beginning of a clause or subclause indicates that either a decision is required or further
information is to be provided by the purchaser. This information or decision should be indicated on the data
sheets; otherwise it should be stated in the quotation request (enquiry) or in the order.
In this International Standard, where practical, US Customary units have been included in brackets for
information.
vi © ISO 2009 – All rights reserved

DRAFT INTERNATIONAL STANDARD ISO/DIS 10437

Petroleum, petrochemical and natural gas industries — Steam
turbines — Special-purpose applications
1 Scope
This International Standard specifies the minimum requirements for steam turbines for special purpose applications for
use in the petroleum, petrochemical and natural gas industries. These requirements include basic design, materials,
fabrication, inspection testing and preparation for shipment. It also covers the related lube-oil systems, instrumentation,
control systems and auxiliary equipment. It is not applicable to general-purpose steam turbines, which are covered in
API Std 611.
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 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances
and designation.
ISO 261, ISO general-purpose metric screw threads — General plan
ISO 262, ISO general-purpose metric screw threads — Selected sizes for screws, bolts and nuts
ISO 724, ISO general-purpose metric screw threads — Basic dimensions
ISO 965 (all parts), ISO general-purpose metric screw threads — Tolerances
ISO 1940-1, Mechanical vibration — Balance quality requirements of rigid rotors — Part 1: Determination of
permissible residual unbalance
ISO 3744, Acoustics — Determination of sound power levels of noise sources using sound pressure —
Engineering method in an essentially free field over a reflecting plane
ISO 6708, Pipe work components – Definition and Selection of DN
ISO 7005-1, Metallic flanges — Part 1: Steel flanges
ISO 7005-2, Metallic flanges — Part 2: Cast iron flanges
ISO 8068, Petroleum products and lubricants — Petroleum lubricating oils for turbines (categories ISO-L-TSA
and ISO-L-TGA) — Specifications
ISO 8501-1, Preparation of steel substrates before application of paints and related products — Visual
assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel
substrates and of steel substrates after overall removal of previous coatings
ISO 8821, Mechanical vibration — Balancing — Shaft and fitment key convention
ISO/DIS 10437
ISO 10438, Petroleum and natural gas industries — Lubrication, shaft sealing and control oil systems for
special-purpose applications.
ISO 10441, Petroleum and natural gas industries — Flexible couplings for mechanical power transmission —
Special purpose applications
ISO 13691, Petroleum and natural gas industries — High-speed special-purpose gear units
ISO 15649, Petroleum and natural gas industries — Piping
IEC 60045-1, Steam turbines — Part 1: Specifications
IEC 60072, Dimensions and output series for rotating electrical machines
IEC 60079, Electrical apparatus for explosive atmospheres
IEC 60953, Rules for steam turbine thermal acceptance tests
1)
EN 287, Approval testing of welders — Fusion welding
EN 288, Specification and approval of welding procedures for metallic materials
API RP 520 PT I, Sizing, selection, and installation of pressure-relieving systems in refineries, Part I — Sizing
2)
and selection.
API RP 520 PT II, Sizing, selection, and installation of pressure-relieving systems in refineries, Part II —
Installation
API Std 526, Flanged steel pressure relief valves
API Std 613, Special-purpose gear units for petroleum, chemical and gas industry services
API Std 670, Machine protection systems
API Std 671, Special-purpose couplings for petroleum, chemical and gas industry services
API RP 684, API Standard Paragraphs Rotordynamic Tutorial: Lateral Critical Speeds, Unbalance Response,
Stability, Train Torsionals and Rotor Balancing.
API RP 686, Recommended Practices for machinery installation and installation design
3)
ASME, Boiler and pressure vessel code, Section V — Nondestructive examination.
ASME, Boiler and pressure vessel code, Section VIII — Pressure vessels
ASME, Boiler and pressure vessel code, Section IX — Qualification standard for welding and brazing
procedures, welders, brazers, and welding and brazing operators
ASME B1.1, Unified screw threads (UN and UNR Thread Form)
ASME B16.1, Cast iron pipe flanges and flanged fittings, Class 25, 125 and 250

1) Comité Européen de Normalisation, 36, rue de Stassart, B-1050 Brussels, Belgium.
2) American Petroleum Institute, Publications and Distribution Section, 1220 L Street Northwest , Washington DC 20005,

USA.
3) ASME International, 3 Park Avenue, New York, NY 10016-5990, USA.
2 © ISO 2009 – All rights reserved

ISO/DIS 10437
ASME B16.5, Pipe flanges and flanged fittings, NPS 1/2 through NPS 24
ASME B16.11, Forged fittings, socket-welding and threaded
ASME B16.42, Ductile iron pipe flanges and flanged fittings, classes 150 and 300
ASME B16.47, Large diameter steel flanges NPS 26 through NPS 60
ASME B17.1, Keys and keyseats
ASME PTC 6, Performance test code 6 on steam turbines
ASME PTC 20.2, Overspeed trip systems for steam turbine-generator units
ASTM A 194, Standard specification for carbon and alloy steel nuts for bolts for high-pressure or high-
4)
temperature service, or both
ASTM A 247, Standard test method for evaluating the microstructure of graphite in iron castings
ASTM A 278, Standard specification for gray iron castings for pressure-containing parts for temperatures up to
650 °F (350 °C)
ASTM A 307, Standard specification for carbon steel bolts and studs, 60 000 psi tensile strength
ASTM A 395, Standard specification for ferritic ductile iron pressure-retaining castings for use at elevated
temperatures
ASTM A 418, Standard test method for ultrasonic examination of turbine and generator steel rotor forgings
ASTM A 472, Standard test method for heat stability of steam turbine shafts and rotor forgings
ASTM A 536, Standard specification for ductile iron castings
5)
AWS D1.1, Structural welding code — Steel
6)
NEMA SM 23, Steam turbines for mechanical drive service.
7)
NFPA 70, National electrical code.
8)
SSPC-SP6/NACE No. 3, Commercial blast cleaning.

4) American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103-1187.

5) American Welding Society, 550 NW Le Jeune Road, PO Box 351040, Miami, FL 33130, USA.

6) National Electrical Manufacturers Association, 1300 N 17th Street; Suite 1847, Rosslyn, VA 22209, USA.

7) National Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02269, USA.
th th
8) SSPC: The Society for Protective Coatings, 40 24 Street 6 floor, Pittsburgh, PA 15222-4656, USA.
ISO/DIS 10437
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. (See Annex B for a guide to
steam turbine nomenclature.)
3.1
alarm point
preset value of a measured parameter at which an alarm is actuated to warn of a condition that requires
corrective action
3.2
anchor bolts
bolts used to attach the mounting plate to the support structure or foundation
3.3
axially split
split with the principal joint parallel to the shaft centreline
3.4
baseplate
fabricated steel structure designed to support the complete steam turbine and / or the driven equipment and
other ancillaries which maybe mounted upon it
3.5
control mechanism
all of the equipment between the speed governor and the governor-controlled valve(s) (such as linkages, pilot
valves, power servos, and so forth)
3.6
critical speed
shaft rotational speed at which the rotor-bearing-support system is in a state of resonance
3.7
design
Manufacturer’s calculated parameter
NOTE  This is a term used by the equipment manufacturer to describe various parameters such as design power,
design pressure, design temperature, or design speed. It is not intended for the purchaser to use this term.
3.8
enclosure
compartment designed to provide noise protection and/or weather protection
NOTE The compartment can include walls, doors and a roof.
3.9
fail safe system
system which causes the equipment to revert to a permanently safe condition (shutdown and/or
depressurized) in the event of a component failure or failure of the energy supply to the system
3.10
field changeable
design feature that permits alteration of a function after the equipment has been installed
NOTE The alteration can be accomplished by the following:
a) soldering jumper leads to terminal pins especially provided for this purpose;
b) employing circuit-board-mounted switches or potentiometers;
4 © ISO 2009 – All rights reserved

ISO/DIS 10437
c) using a shorting or diode-pin-type matrix board;
d) using prewired shorting plugs;
e) using authorized controlled access.
3.11
gauge board
bracket or plate used to support and display gauges, switches, and other instruments
NOTE A gauge board is open and not enclosed. A panel is typically fully enclosed.
3.12
general-purpose turbine
horizontal or vertical turbines used to drive equipment that is usually spared
NOTE General-purpose steam turbines are intended for applications where the inlet gauge pressure does not exceed
4 800 kPa (48 bar) (700 psi) and the inlet temperature does not exceed 400 °C (750 °F), and where the speed does not
exceed 6 000 r/min.
3.13
governor-controlled valve
device that controls the flow of steam into or out of the turbine in response to the speed governor
3.14
hold-down bolts
mounting bolts
bolts that hold the equipment to the mounting plate or plates
3.15
hydrodynamic bearings
bearings that use the principles of hydrodynamic lubrication
NOTE The bearing surfaces are oriented so that relative motion forms an oil wedge, or wedges, to support the load
without shaft-to-bearing contact.
3.16
informative
information only
NOTE  An informative reference or Annex provides advisory or explanatory information. It is intended to assist the
understanding or use of the document
3.17
internal friction damping
damping effect that causes a phase difference between the stress and strain in any material under cyclic
loading
NOTE This phase difference produces the characteristic hysteric loop on a stress-strain diagram and is thus a desta-
bilizing damping force.
3.18
local
〈device〉 mounted on or near the equipment or console
3.19
manufacturer
organization responsible for the design and manufacture of equipment
ISO/DIS 10437
Note The manufacturer is often a different entity than the vendor.

3.20
maximum allowable speed
highest speed at which the manufacturer’s design permits continuous operation
NOTE The maximum allowable speed is usually set by rotation element stress values.
3.21
maximum allowable temperature
maximum continuous temperature for which the manufacturer has designed the equipment (or any part to
which the term is referred) when handling the specified fluid at any specified operating conditions
3.22
maximum allowable working pressure
maximum continuous pressure for which the manufacturer has designed the equipment (or any part to which
the term is referred) when handling the specified fluid at the maximum allowable temperature
3.23
maximum continuous speed
highest speed at which the turbine, as built and tested, is capable of continuous operation, at any of the
specified steam conditions
3.24
maximum exhaust casing pressure
highest exhaust steam pressure that the purchaser requires the casing to contain, with steam supplied at
maximum inlet conditions
NOTE The turbine casing is subjected to the maximum temperature and pressure under these conditions.
3.25
maximum exhaust pressure
highest exhaust steam pressure at which the turbine is required to operate continuously
3.26
maximum inlet pressure and temperature
highest inlet steam pressure and temperature conditions at which the turbine is required to operate
continuously
3.27
maximum sealing pressure
highest pressure the seals are required to seal during any specified static or operating conditions and during
startup and shutdown
3.28
minimum allowable speed
lowest speed at which the manufacturer’s design permits continuous operation
3.29
minimum exhaust pressure
lowest exhaust steam pressure at which the turbine is required to operate continuously
3.30
minimum inlet pressure and temperature
lowest inlet steam pressure and temperature conditions at which the turbine is required to operate
continuously
6 © ISO 2009 – All rights reserved

ISO/DIS 10437
3.31
mounting plate
device used to attach equipment to concrete foundations/structural steel
NOTE The mounting plate includes baseplates and soleplates
3.32
nominal pipe size (NPS)
dimensionless value approximately equal to the diameter in inches

3.33
normal operating point
point at which usual operation is expected and optimum efficiency is desired
NOTE This point is usually the point at which the vendor certifies that performance is within the tolerances stated in
this International Standard.
3.34
normative
required
NOTE  A normative reference or Annex enumerates a requirement or mandate of the specification
3.35
observed (test or inspection)
inspection or test where the purchaser is notified of the timing of the inspection or test and the inspection or
test is performed as scheduled even if the purchaser or his representative is not present
3.36
owner
final recipient of the equipment

NOTE The owner can delegate procurement of the equipment to an agent.
3.37
panel
enclosure used to mount, display and protect gauges, switches and other instruments
3.37
potential maximum power
approximate maximum power to which the turbine can be uprated at the specified normal speed and steam
conditions when it is furnished with suitable (that is, larger or additional) nozzles and, possibly, with a larger
governor-controlled valve or valves
3.39
pressure casing
composite of all stationary pressure-containing parts of the unit, including all nozzles and other attached parts
3.40
purchaser
agency that issues the order and specification to the vendor
NOTE The purchaser can be the owner of the plant in which the equipment is to be installed or the owner’s appointed
agent.
3.41
radially split
split with the principal joint perpendicular to the shaft centreline
ISO/DIS 10437
3.42
rated power
greatest turbine power specified and its corresponding speed; it includes all the margin required by the
specifications of the driven equipment
3.43
rated speed
100 % speed
highest rotational speed required to meet any of the specified operating conditions
3.44
relief valve set pressure
pressure at which a relief valve starts to lift
3.45
remote
〈device〉 located away from the equipment or console, typically in a control room
3.46
shall
required in order to conform to the specification
3.47
should
recommended but not required in order to conform to the specification
3.48
separation margin
margin between a critical speed and the nearest required operating speed
3.49
shutdown set point
preset value of a measured parameter at which automatic or manual shutdown of the system or equipment is
required
3.50
slow roll
speed recommended by the vendor (typically 400 r/min to 500 r/min) for warm-up and initial check of
equipment integrity prior to full operation
3.51
special-purpose turbines
horizontal turbines used to drive equipment that are usually not spared and are used in uninterrupted
continuous operation in critical service
NOTE This category is not limited by steam conditions, power or turbine speed.
3.52
special tool
tool which is not a commercially available catalogue item
8 © ISO 2009 – All rights reserved

ISO/DIS 10437
3.53
Stability analysis
determination of the natural frequencies and the corresponding logarithmic decrement of the damped rotor/
support system using a complex Eigen value analysis.

3.54
Stage
one set of stationary and rotating blade rows

3.55
standby service
service in which a piece of equipment normally idle, or idling, but is capable of immediate automatic or manual
start-up and continuous operation
3.56
synchronous tilt pad coefficient
coefficient derived from the complex frequency-dependent coefficients with the frequency equal to the
rotational speed of the shaft
3.57
steam rate
quantity of steam required by the turbine per unit of power output measured at the output shaft of the turbine
3.58
trip speed
rotational speed at which the independent overspeed shutdown system operates to shut down a turbine
NOTE Trip speed is usually expressed in revolutions per minute.
3.59
unit responsibility
responsibility for coordinating the technical aspects of the equipment and all auxiliary systems included in the
scope of the order
NOTE The technical aspects to be considered include, but are not limited to, such factors as the power requirements,
speed, rotation, general arrangement, couplings, dynamics, noise, lubricant selection, instrumentation, piping, testing of
components, conformance to specifications and material test reports.
3.60
vendor
supplier
agency that supplies the equipment in response to the order
NOTE The vendor may be the manufacturer of the equipment or the manufacturer’s agent and i
...