RAPPORT EXPLICATIF / ISO/DIS 13628-15 N436
ISO/TC 67 / SC 4 / Secretariat ANSI
This form should be sent to the ISO Central Secretariat, together with the English and French versions of the committee draft, by the secretariat of the technical committee or subcommittee concerned. / Ce formulaire doit être envoyé au Secrétariat central de l'ISO en même temps que les versions anglaise et française du projet de comité, par le secrétariat du comité technique ou du sous-comité concerné.
The accompanying document is submitted for circulation to member body vote as a DIS, following consensus obtained from the P-members of the committee. / Le document ci-joint est soumis, pour diffusion comme DIS, au vote comité membre, suite au consensus des membres (P) du comité obtenu.
on
at the meeting of
à la réunion du / TC / SC / see resolution
voir résolution / No.
no / in
dans le / document
by postal ballot initiated on
par un vote par correspondance démarré le / 2009-01-14
Number / Countries
P-members in favour:
Membres (P) approuvant le projet: / 10 / Argentina, Brazil, France, Italy, Kazakhstan, Korea, Netherlands, Norway, United Kingdom, United States
P-members voting against:
Membres (P) désapprouvant: / 0
P-members abstaining:
Membres (P) s'abstenant: / 3 / Canada, Germany, Indonesia
P-members who did not vote:
Membres (P) n'ayant pas voté:
Remarks/Remarques
See Comments below.
I hereby confirm that this draft meets the requirements of part 2 of the ISO/IEC Directives
Je confirme que ce projet satisfait aux prescriptions de la partie 2 des Directives ISO/CEI
Date
2009-06-12 / Name and signature of the secretary
Nom et signature du secrétaire
Ed Baniak
FORM 8 A (ISO) FORMULAIRE 8 A (ISO) Page 1 of/de 23
BR / 1 / te / A figure showing the extent of typical subsea production system identifying manifold, PLET, PLEM and others equipments covered by the scope of this standard will help to understanding the applicability of this standard.This figure may be similar to one in the standard ISO 13628-1 page 7 – clause 4 – figure 1. / Include a figure at the end of the clause nº 1 showing the extent of typical subsea production system with Manifold, PLET, PLEM and others equipments covered by the scope of this standard.
BR / 1 subclause (d) / New component / te / The inclusion of Pig Diverter Valves allow continuity of pigging of flowline system. Example: Gas Lift manifold: the pig may be sent by annular flowline and returned by the production flowline. / Include Pig Diverter Valves in the scope covered by this standard.
BR / 2 / ed / Several standards are referred inside this document without being listed in the Normative references, such as:
API equivalents for ISO 13626 series (17A, 17F, 17E, etc), API 1111, ISO 13819, API Q1, ISO 9001, Several of UNS standards supporting material grades, API 17P, API 17H, etc / Perform a complete double check around the document and list all reference is missing at this section.
BR / 2 / ed / ASTM A 388 is presented out of alphabetical order. / The Normative references list should be presented in alphabetical order in order to facilitate document utilization.
BR / 3.1 / ed / Abbreviation for Carbon Equivalent = CE, CE(Pcm) and CE(IIW) is made at 7.11.1.4.2 (Page 36), but the terms are not list in the abbreviations list. / The list of abbreviation shall contain all the abbreviations used in the document.
BR / 3.1 / ed / The SSIV is not in the abbreviation list. / Include SSIV – subsea isolation valve in the abbreviation list.
BR / 3.2.14 / te / We understand that a design has been validated once the following steps (that are objective evidences that the design has been validated for the design requirements ) has been performed:
· Verification of design calculation (dimensioning)
· Factory process verification (FAT)
· Performance verification (PVT)
· Site integration testing (SIT)
Also, operational service conditions shall be included in the design requirements. / Change the text to: Confirmation that specified design requirements have been fulfilled through the provision of objective evidence. Typically this is achieved by calculations, design reviews, performance verification testing and Factory Acceptance Testing.
BR / 4.1 / Second paragraph / te / The topic “The end user should define or approve the following performance and configuration requirements, including” is not considering the following requirements to be defined or approved by end user:
o Design life
o Water depth
o Soil conditions and axial stiffness
o Metocean data / Include the following requirements to be defined or approved by end user in the topic:
o Design life
o Water depth
o Soil conditions and axial stiffness
o Metocean data
BR / 4.2 / Second paragraph / te / The following considerations related to structures and modules are not being addressed:
o Planned and emergency shutdowns of wells and manifold (including Valves open/close cycles/month)
o Flow rates range (max., min. etc)
o Pressure drops
o Fluid composition / Address the following considerations related to structures and modules:
o Planned and emergency shutdowns of wells and manifold (including Valves open/close cycles/month)
o Flow rates range (max., min. etc)
o Pressure drops
o Fluid composition
BR / 4.3 / te / In order to maintain integrity and functionality in the service conditions the system interface shall take into account the zero seawater ingress. / Include the zero seawater ingress as requirement, changing the text “Zero external leakage” to “Zero external leakage and seawater ingress”.
BR / 4.3 / te / In order to maintain integrity and functionality in the service conditions the system interface shall take into account the internal temperature variation. / Include the internal temperature as requirement, changing the text “External temperature variations” to “Internal and external temperature variations”.
BR / 4.3 / te / To be more extensive about the requirement of potential hydrate prevention. / Change the text “Potential external hydrates” to “Potential hydrates formation”.
BR / 4.4.2 / te / To avoid any doubt of which axis shall be considered, complement the title with (related to vertical and horizontal axis). / Change the title to Alignment (related to vertical and horizontal axis).
BR / 5.1.3 / te / To be more clear regarding what analysis method shall be used for fault analysis. / Include (RAM – Reliability, Availability and Maintainability) at the end of text “Fault analysis capability to identify failed components ….” resulting the following text: “Fault analysis capability to identify failed components (RAM – Reliability, Availability and Maintainability)”.
BR / 5.1.7 / New sub-section / te / A section related to “Corrosion Protection Strategy”, comprising cathodic protection and painting, should be included as part of the System Design Considerations. / As a suggestion:
“Cathodic protection should be design in accordance with DnV-RP-B401 or equivalent international recognized standard. Special considerations shall the made to material selection when the Manifold of the Subsea structure is part of a impressed current cathodic protection system.”
Paint system should be design in accordance API 17D – Appendix D or equivalent international recognized standard.”
BR / 5.3.1 / First topic / te / It is very important to consider actuation valve performance degradation due to wear-out with open/close cycles or natural aging. A wear-out or aged valve may not work properly and jeopardize the gathering produced fluids and/or distribution of injected fluids. / Adapt the text to “The manifold shall provide sufficient piping, valves and flow controls devices to safely gather produced fluids and/or distribute injected fluids such as gas, water or chemicals, and take into account actuation valve performance degradation due to wear-out with open/close cycles or natural aging”
BR / 5.3.1 / Sixth topic / te / To be more specific regarding what manifold may provide for testing of individual wells. / Adapt the text to “The manifold may provide for testing of individual wells (pressure and flow rate).”
BR / 5.31 / New topic / te / Depending on which depth the manifold will work and considering the density of control fluid, the actuator will have to close the valve against a backpressure higher than 100 psi (the minimum pressure above ambient pressure establish by ISO 13628-4). / Include the topic with the following text: The design shall account for control fluid column (air gap plus water depth) and take account its density as a function of temperature and hydrostatic pressure.
BR / 5.3.2 / First paragraph / te / None of the referenced standards in this paragraph is specifically written for subsea manifold piping systems.
Manifold Piping should be revised because it is completely open allowing the use of parts of different standards to design the manifold piping. However, design methodologies are based on material and quality requirements of a same standard only or in some cases the design methodologies are clearly addressed to other one.
The BSI PD 8010-2 is applicable to subsea pipeline intended for conveyance of hydrocarbon liquids, hydrocarbon gases and others gases, liquid and gases in two-phase flow, fluid base-slurries and water. / Piping systems for subsea use shall be designed in accordance with BSI PD 8010-2 - Code of practice for pipelines Part 2: Subsea pipelines.
BR / 5.3.3 / te / Include: When not specified by the purchaser Internal diameter variations of all pigging components shall be in accordance with the allowable ID variations adopted by the pig manufacturers for solid cast pigs.
BR / 5.3.3 / te / Include: Between any two components (valves, fittings) shall be provided a minimum straight length of pipe equivalent to three nominal pipe diameters.
BR / 5.3.3 / te / Include: Piping branch diameters greater than 50% of the header shall be provided with guide bars.
BR / 5.3.5 / te / For those flow assurance issues identified as having the potential to significantly impact the performance of the system at some time in the life-cycle of the development, further evaluation should be undertaken to predict the extent and severity of the problem as well as to identify possible prevention and remediation measures that may need to be considered. / Include the following paragraph: General flow assurance considerations are given in the standard ISO 13628-1 – Annex I.
BR / 5.4.1 / Second paragraph / ed / To be compatible with other comments. / Change the text to: As an alternative, a design verification or design qualification load test of 1.5 times its rated capacity may be substituted for design analysis. The component shall sustain the test loading without deformation to the extent that any performance requirement is not met, and the test documents shall be retained at an agreed location for an agreed time.
BR / 5.6 / te / Design, building and testing of production/injection valves and choke are also covered by ISO 10423 and 13628-4. The standard ISO 13628-4 is especially applicable for subsea equipments (WCT and Wellehad). / Production/Injection valves and choke shall also be designed, built and testing according to the following applicable specifications: ISO 10423 and ISO 13628-4. Therefore the table shall be revised to:
Component / Industry Spec
Production/Injection Valves / API 6A / ISO 10423
API 17D / ISO 13628-4
Chokes / API 6A / ISO 10423
API 17D / ISO 13628-4
Control Components / API 17F
End Connectors / API 17D
Flanges / API 6A / ISO 10423
API 17D / ISO 13628-4
BR / 6.1 / Fourth topic / te / As manifold is an equipment compounded by several components such as valves, control system and connectors, it is very important that theses components are subjected to the qualification testing according to API 6A / ISO 10423 and API 17D / ISO 13628-4. / Change the text to: Performing qualification testing according to this Recommended Practice (for components such as valves, control system and connectors qualification testing shall be performed according to API 6A / ISO 10423 and API 17D / ISO 13628-4).
BR / 6.1 / Fifth topic / te / To be clear regarding the prototype shall be subjected to the factory acceptance testing prior to qualification testing. / Adapt the text to: Performing factory acceptance testing of the prototype to be used to perform qualification testing.
BR / 6.1 / New topic / te / Product shall be representative of its design and a manner of ensuring it is to define the FAT acceptance criteria during the design validation based on the results of the qualification tests. / Include the following topic: Defining FAT acceptance criteria.
BR / 6.2 / First paragraph / te / The design calculation and design review are part of the design verification. / Include the following topics in the first paragraph: Design calculation verification and Design review.
BR / 6.2 / Second paragraph / te / We understand that the design verification shall be performed to ensure that the design equipments have been met instead of specific operational requirements. / Change the text to: Design verification is performed to ensure that the design requirements have been met. In certain cases, it is necessary to perform wet-simulation testing to prove correct functioning of components and systems underwater.
BR / 7.3 / Table 7.3 / ge / Table 7.3 should also has a column for API standards as it already have for ASTM, EN and ISO standards. / Include API 17D and API 6A as material standard for forged retaining components built in carbon or low-allow steel.
BR / 7.6.3 / Table 7.5 / ed / Table 7.5 is split in two parts at pages 29 and 30 of the document. / Re-position the table 7.5, across the text of item 7.6.3 in order that it will not be split in two pages, in order to facilitate document utilization.