SIST EN ISO 10440-1:2008

SLOVENSKI STANDARD
01-junij-2008
1DGRPHãþD
SIST EN ISO 10440-1:2001
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5RWDFLMVNLNRPSUHVRUML]L]WLVNDYDQMHPGHO3URFHVQLNRPSUHVRUML,62

Petroleum, petrochemical and natural gas industries - Rotary-type positive-displacement
compressors - Part 1: Process compressors (ISO 10440-1:2007)
Erdöl-, petrochemische und Erdgasindustrie - Rotierende Verdrängerkompressoren - Teil
1: Prozesskompressoren (ISO 10440-1:2007)
Industries du pétrole, pétrochimique et du gaz naturel - Compresseurs volumétriques de
type rotatif - Partie 1: Compresseurs de procédé (ISO 10440-1:2007)
Ta slovenski standard je istoveten z: EN ISO 10440-1:2007
ICS:
23.140 .RPSUHVRUMLLQSQHYPDWLþQL Compressors and pneumatic
VWURML machines
75.180.20 Predelovalna oprema Processing equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 10440-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2007
ICS 75.180.20 Supersedes EN ISO 10440-1:2000
English Version
Petroleum, petrochemical and natural gas industries - Rotary-
type positive-displacement compressors - Part 1: Process
compressors (ISO 10440-1:2007)
Industries du pétrole, pétrochimique et du gaz naturel - Erdöl-, petrochemische und Erdgasindustrie - Rotierende
Compresseurs volumétriques de type rotatif - Partie 1: Verdrängerkompressoren - Teil 1: Prozesskompressoren
Compresseurs de procédé (ISO 10440-1:2007) (ISO 10440-1:2007)
This European Standard was approved by CEN on 13 July 2007.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10440-1:2007: E
worldwide for CEN national Members.

Contents Page
Foreword.3

Foreword
This document (EN ISO 10440-1:2007) has been prepared by Technical Committee ISO/TC 118
"Compressors, pneumatic tools and pneumatic machines" 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 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 2008, and conflicting national standards shall be withdrawn at
the latest by June 2008.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 10440-1:2000.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: 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 the United Kingdom.
Endorsement notice
The text of ISO 10440-1:2007 has been approved by CEN as a EN ISO 10440-1:2007 without any
modification.
INTERNATIONAL ISO
STANDARD 10440-1
Second edition
2007-08-01
Petroleum, petrochemical and natural gas
industries — Rotary-type positive-
displacement compressors —
Part 1:
Process compressors
Industries du pétrole, pétrochimique et du gaz naturel — Compresseurs
volumétriques de type rotatif —
Partie 1: Compresseurs de procédé

Reference number
ISO 10440-1:2007(E)
©
ISO 2007
ISO 10440-1:2007(E)
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ii © ISO 2007 – All rights reserved

ISO 10440-1:2007(E)
Contents Page
Foreword. v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 4
4 General. 9
4.1 Pressure design code. 9
4.2 Unit responsibility. 9
4.3 Units of measurement . 10
4.4 Statutory requirements . 10
5 Basic design. 10
5.1 General. 10
5.2 Pressure casing . 14
5.3 Casing connections. 16
5.4 External forces and moments . 18
5.5 Rotating elements. 18
5.6 Shaft seals . 19
5.7 Dynamics . 26
5.8 Bearings. 31
5.9 Bearing housings. 34
5.10 Lube-oil and seal-oil systems. 35
5.11 Materials . 39
5.12 Nameplates and rotation arrows. 44
5.13 Quality. 44
6 Accessories. 45
6.1 Drivers. 45
6.2 Couplings and guards. 46
6.3 Mounting plates . 47
6.4 Controls and instrumentation . 49
6.5 Piping . 55
6.6 Intercoolers and aftercoolers . 56
6.7 Inlet air filters . 57
6.8 Inlet separators . 58
6.9 Pulsation suppressors/silencers for dry screw compressors. 58
6.10 Special tools. 60
7 Inspection, testing and preparation for shipment. 61
7.1 General. 61
7.2 Inspection . 61
7.3 Testing . 63
7.4 Preparation for shipment . 68
8 Vendor’s data . 70
8.1 General. 70
8.2 Proposals. 71
8.3 Contract data. 73
Annex A (informative) Typical datasheets. 75
Annex B (informative) Nomenclature for rotary-type positive-displacement compressors. 94
ISO 10440-1:2007(E)
Annex C (normative) Forces and moments . 99
Annex D (normative) Procedure for determination of residual unbalance. 102
Annex E (normative) Typical schematics for pressurized oil systems for flooded screw
compressors. 110
Annex F (informative) Materials and their specifications for rotary compressors . 116
Annex G (informative) Typical mounting plate arrangements . 119
Annex H (informative) Inspector’s checklist. 121
Annex I (informative) Typical vendor drawing and data requirements. 123
Bibliography . 133

iv © ISO 2007 – All rights reserved

ISO 10440-1:2007(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 10440-1 was prepared by Technical Committee ISO/TC 118, Compressors and pneumatic tools,
machines and equipment, Subcommittee SC 1, Process compressors.
This second edition cancels and replaces the first edition (ISO 10440-1:2000), which has been technically
revised.
ISO 10440 consists of the following parts, under the general title Petroleum, petrochemical and natural gas
industries — Rotary-type positive-displacement compressors:
⎯ Part 1: Process compressors
⎯ Part 2: Packaged air compressors (oil-free)
ISO 10440-1:2007(E)
Introduction
This part of ISO 10440 is based on API 619, 4th edition, December 2004, with the intent that the 5th edition of
API 619 will be identical to this part of ISO 10440.
Users of this part of ISO 10440 should be aware that further or differing requirements may be needed for
individual applications. This part of ISO 10440 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 part of ISO 10440 and provide details.
A bullet (•) at the beginning of a subclause or paragraph indicates that either a decision is required or further
information is to be provided by the purchaser. This information should be indicated on the datasheet(s),
otherwise it should be stated in the quotation request or in the order.
In this part of ISO 10440, where practical, US Customary (USC) units are included in brackets for information.
Dedicated datasheets for SI units and for USC units are provided in Annex A.

vi © ISO 2007 – All rights reserved

INTERNATIONAL STANDARD ISO 10440-1:2007(E)

Petroleum, petrochemical and natural gas industries —
Rotary-type positive-displacement compressors —
Part 1:
Process compressors
1 Scope
This part of ISO 10440 specifies requirements for dry and oil-flooded, helical-lobe rotary compressors (see
Figure 1) used for vacuum or pressure or both in petroleum, petrochemical, and gas industry services. It is
intended for compressors that are in special-purpose applications.
It is not applicable to general-purpose air compressors, liquid-ring compressors, or vane-type compressors.
NOTE Standard air compressors are covered in ISO 10440-2.
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 (all parts), Pipe threads where pressure-tight joints are made on the threads
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 281, Rolling bearings — Dynamic load ratings and rating life
ISO 724, ISO general-purpose metric screw threads — Basic dimensions
1)
ISO 945 , Cast iron — Designation of microstructure of graphite
ISO 965 (all parts), ISO general-purpose metric screw threads — Tolerances
ISO 1217, Displacement compressors — Acceptance tests
ISO 1328-1:1995, Cylindrical gears — ISO system of accuracy — Part 1: Definitions and allowable values of
deviations relevant to corresponding flanks of gear teeth
ISO 1940-1:2003, Mechanical vibration — Balance quality requirements for rotors in a constant (rigid) state —
Part 1: Specification and verification of balance tolerances

1) Under revision as ISO 945-1, Designation of microstructure of cast irons — Part 1: Graphite classification by visual
analysis.
ISO 10440-1:2007(E)
ISO 3448:1992 , Industrial liquid lubricants — ISO viscosity classification
ISO 3744, Acoustics — Determination of sound power levels and sound energy levels of noise sources using
sound pressure — Engineering method for an essentially free field over a reflecting plane
ISO 5753:1991, Rolling bearings — Radial internal clearance
ISO 6708, Pipework components — Definition and selection of DN (nominal size)
ISO 7005-1, Pipe flanges — Part 1: Steel flanges for industrial and general service piping systems
ISO 7005-2, Metallic flanges — Part 2: Cast iron flanges
ISO 8821, Mechanical vibration — Balancing — Shaft and fitment key convention
ISO 10437, Petroleum, petrochemical and natural gas industries — Steam turbines — Special-purpose
applications
ISO 10438 (all parts), Petroleum, petrochemical and natural gas industries — Lubrication, shaft-sealing and
control-oil systems and auxiliaries
ISO 10441, Petroleum, petrochemical 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 13706, Petroleum, petrochemical and natural gas industries — Air-cooled heat exchangers
ISO 15649, Petroleum and natural gas industries — Piping
ISO 16812, Petroleum, petrochemical and natural gas industries — Shell-and-tube heat exchangers
IEC 60079 (all parts), Electrical apparatus for explosive gas atmospheres
ANSI/ABMA Standard 7, Shaft and Housing Fits for Metric Radial Ball and Roller Bearings (Except Tapered
2)
Roller Bearings) Conforming to Basic Boundary Plan
ANSI/ABMA Standard 20, Radial Bearings of Ball, Cylindrical Roller and Spherical Roller Types — Metric
Design
API RP 500, Recommended Practice for Classification of Locations for Electrical Installations at Petroleum
3)
Facilities Classified as Class 1, Division 1 and Division 2

API 520 (all parts), Sizing, Selection and Installation of Pressure-Relieving Devices in Refineries
ANSI/API 526, Flanged Steel Pressure Relief Valves
ANSI/API 611, General-Purpose Steam Turbines for Petroleum, Chemical and Gas Industry Services
ANSI/API 613, Special Purpose Gear Units for Petroleum, Chemical and Gas Industry Services
ANSI/API 670, Machinery Protection Systems
ANSI/API 671, Special Purpose Couplings for Petroleum, Chemical, and Gas Industry Services

2) American Bearing Manufacturers Association, 2025 M Street, NW, Suite 800, Washington, DC 20036, USA.
3) American Petroleum Institute, 1220 L Street NW, Washington, DC 20005-4070, USA.
2 © ISO 2007 – All rights reserved

ISO 10440-1:2007(E)
API 677, General-Purpose Gear Units for Petroleum, Chemical and Gas Industry Services
API RP 686:1996, Machinery Installation and Installation Design
4)
ASME B1.1, Unified Inch Screw Threads, UN and UNR Thread Form
ASME B1.20.1-1983, Pipe Threads, General Purpose (Inch)
ASME B16.1, Cast Iron Pipe Flanges and Flanged Fittings: Classes 25, 125, and 250
ASME B16.5, Pipe Flanges and Flanged Fittings
ASME B16.11, Forged Steel 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 Boiler and Pressure Vessel Code: Section V, Nondestructive Examination
ASME Boiler and Pressure Vessel Code: Section IX, Welding and Brazing Qualifications
5)
ASTM A247, Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings
ASTM A278, Standard Specification for Gray Iron Castings for Pressure-Containing Parts for Temperatures
Up to 650 °F
ASTM A320/A320M-05, Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for
Low-Temperature Service
ASTM A395/A395M-99, Standard Specification for Ferritic Ductile Iron Pressure-Retaining Castings for Use at
Elevated Temperatures
ASTM A536, Standard Specification for Ductile Iron Castings
ASTM E94, Standard Guide for Radiographic Examination
ASTM E709, Standard Guide for Magnetic Particle Examination
ASTM E1003, Standard Test Method for Hydrostatic Leak Testing
6)
ANSI/AWS D1.1/D1.1M, Structural Welding Code — Steel
IEEE 841, IEEE Standard for the Petroleum and Chemical Industry — Severe Duty Totally Enclosed
7)
Fan-Cooled (TEFC) Squirrel Cage Induction Motors — Up to and Including 500 HP (370 kW)
NACE MR0103, Materials Resistant to Sulfide Stress Cracking in Corrosive Petroleum Refining
8)
Environments
4) American Society of Mechanical Engineers, Three Park Avenue, New York, NY 10016-5990, USA.
5) American Society for Testing and Materials, 100 Bar Harbor Drive, West Conshohocken, PA 19428-2959, USA.
6) American Welding Society, 550 North LeJeune Road, Miami, FL 33136, USA.
7) Institute of Electrical & Electronic Engineers, 445 Hoes Lane, Piscataway, NJ 08855-1331, USA.
8) NACE international, the corrosion society, 1440 South Creek Drive, Houston, Texas 77084-4906, USA.
ISO 10440-1:2007(E)
9)
NEMA 250, Enclosures for Electrical Equipment (1 000 Volts Maximum)
NEMA SM 23, Steam Turbines for Mechanical Drive Service
10)
NFPA (Fire) 30, Flammable and Combustible Liquids Code
NFPA (Fire) 70-05, 2005 National Electrical Code
11)
TEMA Standard Class C
TEMA Standard Class R
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
NOTE See Annex B for a guide to rotary-type positive-displacement compressor 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 (concrete foundation or steel structure)
NOTE Refer to 3.14 for definition of hold-down bolts.
3.3
axially split
split with the principal joint parallel to the shaft centreline
3.4
baseplate
structure providing support and mounting surfaces for one or more pieces of equipment
3.5
certified point
point at which the vendor certifies that the performance is within the tolerances stated in the standard, usually
the normal operating point
3.6
critical speed
shaft rotational speed at which the rotor-bearing support system is in a state of resonance
3.7
depressurization valve
blowdown valve
valve, external to the compressor, used to relieve the gas pressure within the compressor or compressor
package to atmospheric or flare pressure

9) National Electrical Manufacturers Association, 1300 N. 17th Street, Suite 1847, Rosslyn, VA 22209, USA.
10) National Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02269-9101, USA.
11) Tubular Exchanger Manufacturers Association, Inc., 25 North Broadway, Tarrytown, NY 10591, USA.
4 © ISO 2007 – All rights reserved

ISO 10440-1:2007(E)
3.8
dry screw compressor
helical-lobe rotary compressor that uses no liquid for sealing the rotor clearances and driving the non-coupled
rotor
NOTE 1 The rotor-to-rotor relationship is maintained by timing gears on each rotor and the non-coupled rotor is driven
by the coupled rotor through the timing gears.
NOTE 2 No rotor-to-rotor contact occurs in the dry screw compressor.
3.9
fail-safe
system that 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
flooded screw compressor
helical-lobe rotary compressor with a lubricant (compatible with the process gas) injected into the rotor area
after the closed thread position of the rotor
NOTE This lubricant helps seal rotor clearances and establishes an oil film between the rotors. One rotor drives the
other in the absence of a timing gear.
3.11
gas/oil separator
pressure-containing device, usually a vessel, used to separate entrained oil from the process gas
3.12
gauge board
bracket or plate used to support and display gauges, switches and other instruments
NOTE 1 A gauge board is open and not enclosed
NOTE 2 A gauge board is not a panel. A panel is an enclosure. Refer to 3.31 for the definition of a panel.
3.13
general-purpose application
application that is usually spared or is in non-critical service
3.14
hold-down bolts
mounting bolts
bolts holding the equipment to the mounting plate
3.15
hydrodynamic bearings
bearings that use the principles of hydrodynamic lubrication, where bearing surfaces are oriented such that
relative motion forms an oil wedge or wedges to support the load without shaft-to-bearing contact
3.16
inlet volume flow
flow rate expressed in volume flow units at the conditions of pressure, temperature, compressibility and gas
composition, including moisture content, at the compressor inlet flange
NOTE Inlet volume flow is a specific example of actual volume flow. Actual volume flow is the volume flow at any
particular location such as interstage or compressor discharge. Actual volume flow should not be used interchangeably
with inlet volume flow.
ISO 10440-1:2007(E)
3.17
inlet separator
device, usually a filter or vessel, used to separate entrained solid and liquid contaminants from the process
gas inlet steam
3.18
maximum allowable differential pressure
highest differential pressure that can be permitted in the compressor under the most severe operating
conditions of minimum suction pressure and discharge pressure equal to the relief-valve setting
3.19
maximum allowable speed
highest rotational speed of the power-input rotor at which the manufacturer’s design permits continuous
operation
3.20
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 the specified maximum operating pressure
3.21
maximum allowable working pressure
MAWP
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 specified maximum operating temperature
3.22
maximum continuous speed
highest rotational speed of the power-input rotor at which the machine, as built and tested, is capable of
continuous operation with the specified fluid at any of the specified operating conditions
3.23
maximum power
highest power the compressor and any shaft-driven appurtenances require for any of the specified operating
conditions, including the effect of any equipment (e.g. pulsation suppression devices, process piping,
intercoolers, after-coolers and separators) furnished by the compressor vendor
NOTE Deviations from the specified conditions, such as relief-valve set pressure, are excluded from maximum power.
3.24
maximum sealing pressure
highest pressure at which the seals are required to seal during any specified static or operating condition and
during start-up and shutdown
3.25
minimum allowable speed
lowest rotational speed of the power-input rotor at which the manufacturer's design permits continuous
operation
3.26
minimum allowable temperature
lowest temperature for which the manufacturer has designed the equipment or part thereof
3.27
mounting plate
device used to attach equipment to concrete foundations
NOTE A mounting plate can be a soleplate, a baseplate or a combination of both.
6 © ISO 2007 – All rights reserved

ISO 10440-1:2007(E)
3.28
normal operating point
point at which usual operation is expected and optimum efficiency is desired, usually the certified point
3.29
observed inspection
observed test
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 if the purchaser or his representative is not present
NOTE Refer to 3.58 for the definition of a witnessed test.
3.30
owner
final recipient of the equipment who may delegate another agent as the purchaser of the equipment
3.31
panel
enclosure used to mount, display and protect gauges, switches and other instruments
NOTE A panel is not a gauge board. A panel is enclosed and not open. Refer to 3.12 for the definition of a gauge
board.
3.32
pocket-passing frequency
frequency at which the gas is discharged from the rotor lobes into the discharge port
NOTE Pocket-passing frequency, expressed in hertz, is calculated by multiplying the rotor rotational speed,
expressed in revolutions per minute, by the number of lobes on that rotor and dividing the product by 60.
3.33
pressure casing
composite of all stationary pressure-containing parts of the unit, including all nozzles and other attached parts
3.34
pressure design code
recognized pressure vessel standard specified or agreed by the purchaser
3.35
purchaser
agency that issues the order and specifications 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.
3.36
radially split
split with the principal joint perpendicular to the shaft centreline
3.37
rated speed
100 % speed
highest rotational speed of the power input rotor required to meet any of the specified operating conditions
3.38
relief-valve set pressure
pressure at which a relief valve starts to lift
3.39
remote
located away from the equipment or the console, typically in a control house
ISO 10440-1:2007(E)
3.40
required capacity
largest inlet volume required by the specified operating conditions
3.41
rotor
rotating male or female assembly, including rotor body, shaft and shrunk-on sleeves (if furnished)
NOTE See Figure 1.
3.42
rotor body
helical profile section on or integral with the shaft
3.43
rotor set
set consisting of both male and female rotors and, for dry screw compressors, including timing gears and
thrust collars
3.44
seal buffer gas
clean gas supplied to the process (inboard) side of a seal
3.45
seal barrier gas
clean gas supplied to the area between the seals of a dual seal arrangement at a pressure higher than the
process pressure
3.46
separation seal gas
supply of inert gas or air fed into the region between the seal and the shaft bearing or between the bearing
housing and atmosphere
3.47
settle-out pressure
highest pressure which the compressor experiences when not running and after equilibrium has been reached
NOTE This can be a function of ambient temperature, relief-valve setting and piping-system volume.
3.48
shutdown point
preset value of a measured parameter at which automatic or manual shutdown of the system or equipment is
required
3.49
slide valve
device integral to the compression chamber for varying the volumetric flow through a rotary screw compressor
NOTE See Figure B.2, item 8.
3.50
soleplate
plate grouted to the foundation, with a mounting surface for equipment or for a baseplate
3.51
special-purpose application
application for which the equipment is designed for uninterrupted continuous operation in critical service and
for which there is usually no installed spare equipment
8 © ISO 2007 – All rights reserved

ISO 10440-1:2007(E)
3.52
special tool
tool which is not a commercially available catalogue item
3.53
standby
normally idle or idling piece of equipment that is capable of immediate automatic or manual start-up and
continuous operation
3.54
thermal relief valve
valve for relieving pressure caused by thermal expansion of liquid within a closed volume
3.55
trip speed
rotational speed of the power-input rotor at which the independent emergency overspeed system operates to
shut down a prime mover
NOTE For the purposes of this part of ISO 10440, the trip speed of alternating-current electric motors, except
variable-frequency drives, is the speed corresponding to the synchronous speed of the motor at maximum supply
frequency.
3.56
unit responsibility
responsibility for coordinating the technical aspects of the equipment and all auxiliary systems included in the
scope of the order, including responsibility for reviewing such factors as the power requirements, speed,
rotation, general arrangement, couplings, dynamics, noise, lubrication, sealing system, material test reports,
instrumentation, piping, conformance to specifications and testing of components
3.57
vendor
supplier
agency that supplies the equipment
NOTE The vendor can be the manufacturer of the equipment or the manufacturer’s agent and normally is responsible
for service support.
3.58
witnessed inspection
witnessed test
inspection or test where the purchaser is notified of the timing of the inspection or test and a hold is placed on
the inspection or test until the purchaser or his representative is in attendance
4 General
4.1 Pressure design code
z The pressure design code shall be specified or agreed by the purchaser. Pressure components shall comply
with the pressure design code and the supplemental requirements in this part of ISO 10440.
4.2 Unit responsibility
The vendor who has unit responsibility shall ensure that all subvendors comply with the requirements of this
part of ISO 10440.
ISO 10440-1:2007(E)
4.3 Units of measurement
z The purchaser shall specify whether data, drawings, hardware (including fasteners) and equipment supplied
for this part of ISO 10440 shall use the SI or USC units.
NOTE Dedicated datasheets for SI units and for USC units are provided in Annex A.
4.4 Statutory requirements
The purchaser and the vendor shall mutually determine the measures to be taken to comply with any
governmental codes, regulations, ordinances or rules that are applicable to the equipment.
5 Basic design
5.1 General
5.1.1 Typical helical-lobe compressor rotors are shown in Figure 1.

Key
1 male rotor
2 female rotor
3 rotor body
4 shaft extension – male rotor
5 shaft extension – female rotor
Figure 1 — Helical-lobe compressor rotors
The equipment (including auxiliaries) covered by this part of ISO 10440 shall be designed and constructed for
a minimum service life of 20 years and at least 3 years of uninterrupted operation.
It is recognized that this is a design criterion.
10 © ISO 2007 – All rights reserved

ISO 10440-1:2007(E)
The term “design” shall apply solely to parameters or features of the equipment supplied by the manufacturer.
The term “design” should not be used in the purchaser's enquiry or specifications because it can create
confusion in understanding the order.
5.1.2 The vendor shall assume unit responsibility for all equipment and all auxiliary systems included in the
scope of the order.
z 5.1.3 The purchaser shall specify the equipment’s normal operating point.
z 5.1.4 The purchaser shall specify all other operating points, including start-up conditions, and shall indicate
the certified operating point.
z 5.1.5 The purchaser shall specify the settle-out pressure. In the event that this pressure is not available at
the time of inquiry, the normal discharge pressure shall be assumed.
NOTE If the actual settle-out pressure is higher than the assumed pressure, the seal system, drive-train components,
relief valves and piping system can be adversely affected.
5.1.6 Equipment driven by induction motors shall be rated at the actual motor speed for the rated load
condition.
5.1.7 Equipment shall be designed to run, without damage, at the relief-valve set pressure, specified
maximum differential pressure and trip speed (see 5.1.12) simultaneously.
NOTE There can be insufficient driver power to operate under these conditions.
For machines operating with variable suction and discharge-pressure levels, maximum allowable temperature
can occur before maximum allowable pressure or maximum allowable differential pressure occurs. In such
cases, the manufacturer and the purchaser should jointly consider and apply suitable safeguarding controls to
avoid any damage. Controls may include but are not limited to discharge temperature or differential pressure.
5.1.8 Unless otherwise specified, cooling-water systems shall be designed for the conditions given in
Table 1:
Table 1 — Conditions for cooling-water systems
Water velocity over heat-exchange surfaces 1,5 m/s to 2,5 m/s 5 ft/s to 8 ft/s
a
a
Maximum allowable working pressure (MAWP)
> 700 kPa (7,0 bar) > 100 psi
a
a
Test pressure (1,5 times MAWP) > 150 psi
> 1 050 kPa (10,5 bar)
Maximum pressure drop 100 kPa (1 bar) 15 psi
Maximum inlet temperature 32 °C 90 °F
Maximum outlet temperature 50 °C 120 °F
b
Maximum temperature rise 17 K
30 R
b
Minimum temperature rise 10 K
20 R
2 2
Fouling factor on water side 0,35 m K/kW 0,002 h⋅ft ⋅R/Btu
Shell-corrosion allowance 3,0 mm 0,125 in
a
Gauge pressure.
b
Rankin is a deprecated unit.
The vendor shall notify the purchaser if the criteria for minimum temperature rise and velocity over heat-
exchange surfaces result in a conflict. The criterion for velocity over heat-exchange surfaces is intended to
minimize water-side fouling; the criterion for minimum temperature rise is intended to minimize the use of
cooling water. If such a conflict exists, the purchaser shall approve the final selection.
ISO 10440-1:2007(E)
5.1.9 The arrangement of the equipment, including piping and auxiliaries, shall be developed jointly by the
purchaser and the vendor. The arrangement shall provide adequate clearance areas and safe access for
operation and maintenance.
5.1.10 All equipment shall be designed to permit rapid and economical maintenance. Major parts, such as
casing components and bearing housings, shall be designed and manufactured to ensure accurate alignment
on reassembly. This can be accomplished by the use of shouldering, cylindrical dowels or keys.
5.1.11 The equipment’s maximum continuous speed shall be not less than 105 % of the rated speed for
variable-speed machines and shall be equal to the rated speed for constant-speed motor drives.
5.1.12 The equipment’s trip speed shall not be less than the values in Table 2.
Table 2 — Driver trip speeds
Driver Type Trip Speed
(% of maximum continuous speed)
Steam turbine
a
— Nema class A
a
— Nema class B, C and D
Gas turbine 105
Variable-speed motor 110
Constant-speed motor 100
Reciprocating engine 110
a
Indicates governor class as specified in NEMA SM 23.
5.1.13 Spare and replacement parts for the machine and all furnished auxiliaries shall meet all the criteria of
this part of ISO 10440.
5.1.14 Oil reservoirs and housings that enclose moving, lubricated parts, such as bearings, shaft seals,
highly polished parts, instruments and control elements, shall be designed to minimize contamination by
moisture, dust and other foreign matter during periods of operation and idleness.
5.1.15 The equipment (machine, driver and ancillary equipment) shall perform on the test stand and on their
permanent foundation within the specified acceptance criteria. After installation, the performance of the
combined units shall be the joint responsibility of the purchaser and the vendor who has unit responsibility.
The performance of the machine shall also take into account the following.
a) The power at the certified point s
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