oSIST prEN ISO 13628-6:2012

Petroleum and natural gas industries - Design and operation of subsea production systems - Part 6: Subsea production control systems (ISO/DIS 13628-6:2012)

2011-07-18 ANP: Text received in ISO/CS (see notification from 2011-07-18 in dataservice).
2009-04-10 EMA: WI created following ISO discrepancy list of April 2009.

Erdöl- und Erdgasindustrie - Auslegung und Betrieb von Unterwasser-Produktionssystemen - Teil 6: Steuersysteme für die Unterwasser-Produktion (ISO/DIS 13628-6:2012)

Industries du pétrole et du gaz naturel - Conception et exploitation des systèmes de production immergés - Partie 6 : Commandes pour équipements immergés (ISO/DIS 13628-6:2012)

Industrija za predelavo nafte in zemeljskega plina - Načrtovanje in delovanje podvodnih proizvodnih sistemov - 6. del: Krmilni sistemi za proizvodnjo pod vodo (ISO/DIS 13628-6:2012)

General Information

• Status: Not Published
• Public Enquiry End Date: 24-Apr-2012
• ICS: 75.180.10 - Exploratory, drilling and extraction equipment
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 98 - Abandoned project (Adopted Project)
• Start Date: 10-Jan-2020
• Due Date: 15-Jan-2020
• Completion Date: 10-Jan-2020
• Ref Project: prEN ISO 13628-6 - Petroleum and natural gas industries - Design and operation of subsea production systems - Part 6: Subsea production control systems (ISO/DIS 13628-6:2012)

Relations

• Revised: SIST EN ISO 13628-6:2007 - Petroleum and natural gas industries - Design and operation of subsea production systems - Part 6: Subsea production control systems (ISO 13628-6:2006)
• Effective Date: 22-Apr-2009
• Revised: SIST EN ISO 13628-6:2007 - Petroleum and natural gas industries - Design and operation of subsea production systems - Part 6: Subsea production control systems (ISO 13628-6:2006)
• Effective Date: 18-Jan-2023
• Revised: SIST EN ISO 13628-6:2007 - Petroleum and natural gas industries - Design and operation of subsea production systems - Part 6: Subsea production control systems (ISO 13628-6:2006)
• Effective Date: 19-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN ISO 13628-6:2012
01-april-2012
,QGXVWULMD]DSUHGHODYRQDIWHLQ]HPHOMVNHJDSOLQD1DþUWRYDQMHLQGHORYDQMH
SRGYRGQLKSURL]YRGQLKVLVWHPRYGHO.UPLOQLVLVWHPL]DSURL]YRGQMRSRGYRGR
,62',6
Petroleum and natural gas industries - Design and operation of subsea production
systems - Part 6: Subsea production control systems (ISO/DIS 13628-6:2012)
Erdöl- und Erdgasindustrie - Auslegung und Betrieb von Unterwasser-
Produktionssystemen - Teil 6: Steuersysteme für die Unterwasser-Produktion (ISO/DIS
13628-6:2012)
Industries du pétrole et du gaz naturel - Conception et exploitation des systèmes de
production immergés - Partie 6 : Commandes pour équipements immergés (ISO/DIS
13628-6:2012)
Ta slovenski standard je istoveten z: prEN ISO 13628-6
ICS:
75.180.10 Oprema za raziskovanje in Exploratory and extraction
odkopavanje equipment
oSIST prEN ISO 13628-6:2012 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 13628-6:2012

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oSIST prEN ISO 13628-6:2012


EUROPEAN STANDARD
DRAFT
prEN ISO 13628-6
NORME EUROPÉENNE

EUROPÄISCHE NORM

January 2012
ICS 75.180.10 Will supersede EN ISO 13628-6:2006
English Version
Petroleum and natural gas industries - Design and operation of
subsea production systems - Part 6: Subsea production control
systems (ISO/DIS 13628-6:2012)
Industries du pétrole et du gaz naturel - Conception et Erdöl- und Erdgasindustrie - Auslegung und Betrieb von
exploitation des systèmes de production immergés - Partie Unterwasser-Produktionssystemen - Teil 6: Steuersysteme
6 : Commandes pour équipements immergés (ISO/DIS für die Unterwasser-Produktion (ISO/DIS 13628-6:2012)
13628-6:2012)
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-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, 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, Turkey 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
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN ISO 13628-6:2012: E
worldwide for CEN national Members.

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oSIST prEN ISO 13628-6:2012
prEN ISO 13628-6:2012 (E)
Contents Page
Foreword .3

2

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oSIST prEN ISO 13628-6:2012
prEN ISO 13628-6:2012 (E)
Foreword
This document (prEN ISO 13628-6:2012) has been prepared by Technical Committee ISO/TC 67 "Materials,
equipment and offshore structures for petroleum, petrochemical 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 13628-6:2006.
Endorsement notice
The text of ISO/DIS 13628-6:2012 has been approved by CEN as a prEN ISO 13628-6:2012 without any
modification.

3

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oSIST prEN ISO 13628-6:2012

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oSIST prEN ISO 13628-6:2012

DRAFT INTERNATIONAL STANDARD ISO/DIS 13628-6
ISO/TC 67/SC 4 Secretariat: ANSI
Voting begins on Voting terminates on

2012-01-12 2012-06-12
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION    МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ    ORGANISATION INTERNATIONALE DE NORMALISATION


Petroleum and natural gas industries — Design and operation
of subsea production systems —
Part 6:
Subsea production control systems
Industries du pétrole et du gaz naturel — Conception et exploitation des systèmes de production immergés —
Partie 6: Commandes pour équipements immergés
[Revision of second edition (ISO 13628-6:2006)]
ICS 75.180.10


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, 2012

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oSIST prEN ISO 13628-6:2012
ISO/DIS 13628-6

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 [e-mail]
Web www.iso.org
Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.

ii © ISO 2012 – All rights reserved

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Contents Page
1 Scope .1
2 Normative references .2
3 Terms and definitions .4
4 Symbols and abbreviated terms .8
5 System requirements .9
6 Surface equipment. 33
7 Subsea equipment . 42
8 Interfaces . 55
9 Materials and fabrication . 58
10 Quality . Error! Bookmark not defined.
11 Testing . 60
12 Marking, packaging, storage and shipping . 72
Annex A (informative) Types and selection of control system . 75
Annex D (informative) Operational considerations with respect to flow line pressure exposure . 109
Annex E (informative) Analogue devices, level 1 . 111
Annex F (normative) Digital serial devices, level 2 . 112
Annex G (normative) Intelligent well devices, IWIS . 118
Annex H (normative) Ethernet TCP/IP devices, level 3 . 129
Annex I (normative) Insulation resistance (IR) testing . 137

ii

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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 13628-6 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures
for petroleum and natural gas industries, Subcommittee SC 4, Drilling and production equipment.
This second edition cancels and replaces the first edition (ISO 13628-6:2000) which has been technically
revised.
ISO 13628 consists of the following parts, under the general title Petroleum and natural gas industries —
Design and operation of subsea production systems:
 Part 1: General requirements and recommendations
 Part 2: Unbonded flexible pipe systems for subsea and marine applications
 Part 3: Through flowline (TFL) systems
 Part 4: Subsea wellhead and tree equipment
 Part 5: Subsea umbilicals
 Part 6: Subsea production control systems
 Part 7: Completion/workover riser systems
 Part 8: Remotely Operated Vehicle (ROV) interfaces on subsea production systems
 Part 9: Remotely Operated Tools (ROT) intervention systems
 Part 10: Specification for bonded flexible pipe
 Part 11: Flexible pipe systems for subsea and marine applications
 Part 12:Dynamic production risers (in preparation)
 Part 13:Remotely operated tools and interfaces on subsea production systems (in preparation)
 Part 14: High integrity pressure protection system (HIPPS) (in preparation)
iii

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oSIST prEN ISO 13628-6:2012
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 Part 15: Subsea structures and manifolds
 Part 16: Specifications for flexible pipes ancillary equipment (in preparation)
 Part 17: Recommended practice for flexible pipes ancillary equipment (in preparation)
Introduction
Description of hardware is included in this part of ISO 13628 to illustrate functional requirements. This part of
ISO 13628 should not be interpreted in a way which would limit new solutions with documented improved life-
cycle benefits.
This part of ISO 13628 establishes design standards for systems, subsystems, components and operating
fluids in order to provide for the safe and functional control of subsea production equipment.
This part of ISO 13628 contains various types of information related to subsea production control systems.
They are
 informative data that provide an overview of the architecture and general functionality of control systems
for the purpose of introduction and information,
 basic prescriptive data that apply to by all types of control system,
 selective prescriptive data that are control-system-type sensitive and apply only where relevant,
 optional data or requirements that need be adopted only when considered necessary either by the
purchaser or the vendor.
In view of the diverse nature of the data provided, control system purchasers and specifiers are advised to
select from this part of ISO 13628 only the provisions needed for the application at hand. Failure to adopt a
selective approach to the provisions contained herein can lead to the subsea control system being over
specified and higher purchase costs.


iv

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oSIST prEN ISO 13628-6:2012

INTERNATIONAL STANDARD ISO/DIS 13628-6:20XX


Petroleum and natural gas industries — Design and operation
of subsea production systems —
Part 6:
Subsea production control systems
1 Scope
This part of ISO 13628 is applicable to design, fabrication, testing, installation and operation of subsea
production control systems.
This part of ISO 13628 covers surface control system equipment, subsea-installed control system equipment
and control fluids. This equipment is utilized for control of subsea production of oil and gas and for subsea
water and gas injection services. Where applicable, this part of ISO 13628 can be used for equipment on
multiple-well applications.
Rework and repair of used equipment are beyond the scope of this part of ISO 13628.
1

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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 3722, Hydraulic fluid power — Fluid sample containers —Qualifying and controlling cleaning methods
ISO 4406:1999, Hydraulic fluid power — Fluids — Method for coding the level of contamination by solid
particles
ISO 4407, Hydraulic fluid power — Fluid contamination – Determination of particulate contamination by the
counting method using an optical microscope
ISO 7498 (all parts), Information processing systems — Open Systems Interconnection — Basic Reference
Model
ISO/IEC 8802-3, Information technology — Telecommunications and information exchange between systems
— Local and metropolitan area networks — Specific requirements — Part 3: Carrier sense multiple access
with collision detection (CSMA/CD) access method and physical layer specifications
ISO 9606-1, Approval testing of welders — Fusion welding — Part 1: Steels
ISO 9606-2, Qualification test of welders — Fusion welding — Part 2: Aluminium and aluminium alloys
ISO 10423, Petroleum and natural gas industries — Drilling and production equipment — Wellhead and
christmas tree equipment
ISO 10945, Hydraulic fluid power — Gas-loaded accumulators — Dimensions of gas ports
ISO/TR 10949, Hydraulic fluid power — Component cleanliness — Guidelines for achieving and controlling
cleanliness of components from manufacture to installation
ISO 11500, Hydraulic fluid power -- Determination of the particulate contamination level of a liquid sample by
automatic particle counting using the light-extinction principle
ISO 11898-3, Road Vehicles – Controller Area Network (CAN) – Part 3: Low-Speed, Fault-Tolerant, Medium-
Dependent Interface
ISO 15607, Specification and qualification of welding procedures for metallic materials — General rules
ISO 15609-2, Specification and qualification of welding procedures for metallic materials —Welding procedure
specification — Part 2: Gas welding
ISO 15610, Specification and qualification of welding procedures for metallic materials — Qualification based
on tested welding consumables
ISO 15611, Specification and qualification of welding procedures for metallic materials — Qualification based
on previous welding experience
ISO 15612, Specification and qualification of welding procedures for metallic materials — Qualification by
adoption of a standard welding procedure
ISO 15613, Specification and qualification of welding procedures for metallic materials — Qualification based
on pre-production welding test
ISO 15614-1, Specification and qualification of welding procedures for metallic materials —Welding procedure
test — Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys
2

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ISO 16889, Hydraulic fluid power — Filters — Multi-pass method for evaluating filtration performance of a filter
element
ISO 21018,Hydraulic fluid power —Monitoring the level of particulate contamination of the fluid — Part 1:
General principles
ANSI/ASME B31.3, Process Piping
ANSI/TIA/EIA-568-B, Commercial Building Telecommunications Cabling Standard
AS 4059, Aerospace fluid power — Cleanliness classification for hydraulic fluids
ASME Boiler and Pressure Vessel Code, Section VIII, Division 1, Rules for the Construction of Pressure
Vessels
ASME Boiler and Pressure Vessel Code, Section IX, Welding and Brazing Qualifications
ASME Boiler and Pressure Vessel Code, Section V,Non-destructive Examination
ASTM D97, Standard Method for Pour Point of Petroleum Products
ASTM D445, Standard Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and the
Calculation of Dynamic Viscosity)
ASTM D1141, Standard Practice for the Preparation of Substitute Ocean Water
ASTM D1401,Water Separability of Petroleum Oils and Synthetic Fluids
ASTM D3233, Standard Test Methods for Measurement of Extreme Pressure Properties of Fluid Lubricants
(Falex Pin and Vee Block Methods)
ASTM G1:2003, Standard Practice for Preparing, Cleaning, and Evaluating Corrosion Test Specimens
BS 7201-1, Hydraulic fluid power — Gas loaded accumulators — Specification for seamless steel accumulator
bodies above 0,5 l water capacity
CiA 309-1, Interfacing CANopen with TCP/IP – Part 1: General Principles and Services
CiA 309-3, Interfacing CANopen with TCP/IP – Part 3: ASCII Mapping
CiA 443, CANopen Profile for SIIS Level-2 Devices
DIN 41612-2, Special contacts for multi two-part connectors; concentric contacts (type C)
IEEE 802.3, CSMA/CD Ethernet
Internet RFC 791, Internet Protocol, http://www.faqs.org/rfcs/rfc791.html
Internet RFC 793, The Transmission Control Protocol (TCP), http://www.faqs.org/rfcs/rfc793.html
Internet RFC 1332, The PPP Internet Protocol Control Protocol (IPCP), http://www.ietf.org/rfc/rfc1332.txt
Internet RFC 1661, The Point-to-Point Protocol (PPP), http://www.faqs.org/rfcs/rfc1661.html
Internet RFC 768, User Datagram Protocol
3

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3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
boost
pressure maintained on the spring-return side of a subsea actuator for the purposes of improving closing-time
response
3.2
closed hydraulic circuit
hydraulic circuit (system) where the used control fluid is returned to the HPU through an umbilical return line
3.3
commanded closure
closure of the underwater safety valve and possibly other valves depending on the control system design
NOTE Such commands can originate manually, automatically or as part of an ESD.
3.4
communication distribution unit
CDU
communicates with the host facility and distributes communication within the subsea network in an
electrohydraulic or electric system
3.5
control path
total distance that a control signal (e.g. electrical, optical, hydraulic) travels from the topside control system to
the subsea control module or valve actuator
3.6
design life
specified operational life of system after pre-delivery test
3.7
design pressure
maximum pressure for which the system or component was designed for continuous usage
3.8
diagnostic data
data provided to monitor the condition of the equipment
NOTE Can include the ability to make (engineering) adjustments.
3.9
direct hydraulic control
control method wherein hydraulic pressure is applied through an umbilical line to act directly on a subsea
valve actuator
NOTE Upon venting of the pressure at the surface, the control fluid is returned through the umbilical to the surface
due to the action of the restoring spring in the valve actuator. Subsea functions may be ganged together to reduce the
number of umbilical lines.
3.10
downstream
away from a component in the direction of flow
4

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3.11
electrohydraulic control
control method wherein communication signals are conducted to the subsea system and used to open or
close electrically-controlled hydraulic control valves. See Annex A.
3.12
electric control
control method wherein communication signals and power are conducted to the subsea system and use
motors to open or close Subsea valves. See Annex A.
3.13
expert operation
operating the IWCS with other control commands or other methods than used for normal operation
NOTE Typically used by IWCS supplier or other skilled resource to read IWCS diagnostic data and make
(engineering) adjustments to IWCS equipment.
3.14
flying lead
single or multiple composite grouping of hydraulic, chemical, electrical power, electrical signal, and/or optical
signal carrying conduits used to interconnect various items of subsea equipment.
NOTE Flying leads may be designed for ROV or ROT assisted deployment.
3.15
hydraulic circuit
arrangement of interconnected components which generates, transmits, controls and converts hydraulic
energy
3.16
hydraulic component
individual unit, excluding piping, comprising one or more parts designed to be a functional part of a hydraulic
circuit
3.17
hydrostatic test pressure
maximum test pressure at a level greater than the design pressure
3.18
intelligent well
well that employs permanently installed downhole sensors and/or permanently installed downhole control
devices that are operable from a surface facility
3.19
intelligent well control system
control system used to operate an intelligent well
3.20
looped hydraulic circuit
hydraulic circuit where the return side of the SCM is connected to the return/boost side of the process valve
actuators
NOTE During stroking, used control fluid is expelled to ambient sea for open hydraulic circuits, or into the umbilical
return line for closed hydraulic circuits. At the return stroke, control fluid from the actuator function side is looped via the
DCV to the actuator return/boost side.
3.21
normal operation
operating the system to perform the intended basic functionality
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3.22
offset
horizontal component of control path length
3.23
open hydraulic circuit
hydraulic circuit (system) where the used control fluid is exhausted into the ambient sea at the subsea location.
3.24
response time
sum of the signal time and the shift time
3.25
running tool
tool used to install, operate, retrieve, position or connect subsea equipment remotely from the surface
NOTE An example is the subsea control-module running tool.
3.26
shift time
period of time elapsed between the arrival of a control signal at the subsea location (the completion of the
signal time) and the completion of the control function operation
NOTE Of primary interest is the time to fully stroke, on a subsea tree, a master or wing valve that has been
designated as the underwater safety valve.
3.27
signal time
period of time elapsed between the remote initiation of a control command and the initiation of a control
function operation subsea (the commencement of the shift time)
3.28
subsea production control system
control system operating a subsea production system during production operations
3.29
surface safety valve
safety device that is located in the production bore of the well tubing above the wellhead (platform well), or at
the point of subsea well production embarkation onto a platform, and that will automatically close upon loss of
hydraulic pressure
3.30
surface controlled subsurface safety valve
safety device that is located in the production bore of the well tubing below the subsea wellhead and that will
close on loss of hydraulic pressure
3.31
umbilical
combination of electric cables, hoses or steel tubes, either on their own or in combination (or with fibre optic
cables), cabled together for flexibility and over-sheathed and/or armoured for mechanical strength and
typically supplying power and hydraulics, communication and chemicals to a subsea system
3.32
underwater safety valve
safety valve assembly that is declared to be the USV and which will automatically close upon loss of power to
that actuator
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3.33
unlooped hydraulic circuit
hydraulic circuit where the actuator return side and the SCM return side are not interconnected. Control fluid is
not looped from either side of the actuator to the other side
3.34
upstream
away from a component against the direction of flow




Pressure definitions


DEFINITION
WIDELY USED

OFFICIAL TERM ALTERNATIVE
3.1.1
TERMS
COMPONENT BASED SYSTEM BASED

A generic component characteristic. The maximum pressure for which the system
The component is expected to function is designed to operate. The system design
RATED
DESIGN normally for a given design life and/or a pressure is limited by the component with the

WORKING DP
PRESSURE number of cycles at the design pressure lowest design pressure. This is the maximum
PRESSURE
in continuous usage. set point for the pressure relief valve.


Constant pressure, at a defined factor Constant pressure, at a defined factor higher
higher than the design pressure applied than the design pressure applied to a system
PROOF to a component for a limited duration to for a limited duration to demonstrate its
HYDROSTATIC
PRESSURE; demonstrate its integrity without integrity without causing destruction or
TEST HTP
TEST causing destruction or deterioration. deterioration. The system is not designed to
PRESSURE
PRESSURE The component is not designed to be be operated at the hydrostatic test pressure
operated at the hydrostatic test
pressure

An operational system characteristic. An operational system characteristic. The
MAXIMUM MAXIMUM The hi
...