SELECTION OF STEEL MATERIALS IS DONE ACC. TO DNV-ST-0145, SECTION 4.6., C274-RA-M-RA-01000AND EN10225 Annex. F DESIGN / SERVICE TEMPERATURE IS -20°C FOR AREA 1, FRACTURE MECHANICS-20°C CHARPY IMPACT TEST @ -50°CA Positive Material Identification (PMI) program for stainless steel items shall be established. A minimum of 10 % PMI shall be performed on installed equipment.Contractor shall provide the facilities and assistance required for the execution of Audit and Verification by Company.Norsok M-501 coating system Smulders propose to use a zinc rich epoxy instead of zinc silicate primer.7A Norsok mentioned 2X 500 µm but client increased to 2X750 µm as minimum dry film thickness- Smulders want to point out that there is a discrepancy between the different Employers Requirements. This document mentioned minimum DFT and document C-256-RA-M-SP-00025 mentioned 8020-90/10 rule.Norsok M-501 coating system 7A Norsok mentioned 2X 500 µm but client increased to 2X750 µm as minimum dry film thickness- Smulders would like to apply an 80/20 rule for the dry film thickness instead of minimum dry film thickness to avoid excess dry film thickness due to the difficulty of constructionHot-dip galvanizing shall be in accordance with ISO 1461. Minimum coating thickness for structural items and outfitting steel shall be 125 µm and 900 g/m2.Not clear due to the different ER which quality of steel dressing is needed as minimum requirementCompany wording - Tenderer shall describe how to develop the FEED design within the Building Permit design limits into detailed design in cooperation with main interface contractors.Company wording -Tenderer shall describe how to develop the FEED design within the Building Permit design limits into detailed design in cooperation with main interface contractors.Fresh Water System and Grey Water System has been shown in Tenderer proposal due to the inclusion of the safety shower, washroom and kitchen.From Company Q&A #48 Company Building Permit Design has not been received.TENDERER CLARIFICATION - From the Ramboll FEED the location of the Main Crane on the north east corner of the roof structure will mean that the Crane will not be able to fully reach the cooler banks for the main HV/MV transformer B coolers on the south west side or the main transformer hatch - B. In addition the Diesel Generator platform extension on the south East side of the roof will block access to the main HV/MV transformer A coolers on the south east side.TENDERER CLARIFICATION - Deck plate on top of H/I girders is not acceptable. Deck plates shall be flush top of steel with top flange of H/I girders/profiles. Deck plates with thickness below 8 mm should not be used.Please indicate the reason for this requirement as this will lead to additional costs and longer lead times in the production of the floor sections. See below for a typical floor plate connection we intend to use.TENDERER CLARIFICATION - In case of a ship collision, ref. /4/ collision with vessel superstructure shall be consiedered in design of the topside. Critical equipment or equipment that cause environmental harm in case of a collision shall not be positioned in an area where it can be exposed to ship impact.Please specify which type of ship should be considered, and what equipment is to be considered as “critical”. This is assumed to be a layout exercise only (eg no critical equipment on the outside of the structure).TENDERER CLARIFICATION - Smulders typically suggests the use of coated carbon steel for ladders and stairs. Handrailing is suggested to be bolted and to be made out of hot dip galvanized carbon steel.This need to be discussed further during the detailed Engineering, coated CS is not the preferrable solutions. Please confirm that there will be no cost impactTENDERER CLARIFICATION - “The OHVS shall consist of a multi-story structure of which the cellar deck will consist of an open truss-type structure over the complete length of the substation. From the main deck up, the substation will be an enclosed structure with walls (internal & external) made out of sandwich panels which will not take part in the overall stability of the structure. Vertical braces will be foreseen to assure the overall stability of the upper decks. We would like to discuss with Company whether this way forward is agreed as basis for our offer.”From Company Q&A #64 Tenderer notes: PS 4 ESD is left out of the FEED documentation because of uncompleted work during FEED regarding need for ESD system. ESD functions to be defined and concluded in the coming phaseFrom Company Q&A #116 Tenderer notes: The correct number is two piles per leg. Rambøll is currently updating the model. The model will be shared for information as soon as it is updatedFrom Company Q&A #122 #123 Tenderer notes documents shall be issued to CB for Approval and TSO for comment.From Company Q&A #125 Tenderer notes with respect to free-issue equipment - Telecom and Automation equipment is still under design development and info about this delivery can be provided at a later stage.From Company Q&A #127 Tenderer notes - Tenderer is requested to provide the most optimal Schedule/Ready for sail away (RFSA) datesTenderer notes that full details of ALL Company free-issue plant & equipment, in particular ESON Hitachi HV-MV equipment, has not yet been issued.From Company Q&A Tenderer notes - “Contractor shall update, revise and reissue documents according to Company's comments no later than ten working days after receiving the comments.”Number of review cycles. – TBA as required by CompanyFrom Company Q&A #149 Tenderer notes: Question - In order to facilitate the installation of all free issued items and procure cables related to these items, Contractor requests Company to provide the following information.1. Complete list of Free issued Items, which needs to be installed by Contractor in OSS.2. List of associated cables for these free issued items to be purchased by Contractor.3. Interface list of free issued items.4. Complete list of Free issued Items, which needs to be installed by Contractor in TSO(if any).5 .Complete list of Free issued Items, which needs to be installed by Contractor in ONS(if any).From Company Q&A #157 Tenderer notes: Question - Company is kindly requested to share electrical and physical parameters of inter array cables such as:-Current carrying capacity for deciding platform cable sizes after cable joint.-Outer diameter (OD) and minimum bending radius (MBR) for 3C subsea cable to develop cable pull in philosophy and to decide cable deck height.-OD and MBR for Single core (1C) cable for subsea cable to develop cable routing on Platform deckFrom Company Q&A #160 Tenderer notes: Question - Company is kindly requested to provide IAC & EC cable data and proposed cable pull methodology being proposed by IAC & EC cable contractor (e.g.uadrant method with pull in winch on cable deck or traction winch for straight cable pull in with topside installed). This is required to develop cable pull in philosophy by Contractor.Geotechnical Interpretative Report (GIR)with document no. C274-RA-G-RA-01000_F01 is already available in the FFED document. Section 1.2 of C274-RA-G-RA-01000, Rev. F01 states that a separate GIR is prepared also in the FEED.a) Tenderer considers both these GIRs as reply-upon documents for project execution stage and it is not required to produce any other Geotechnical Interpretative Report (GIR) later. Please confirm/clarify the scope.b) Tenderer also requests to share the Geotechnical Interpretative Report (GIR).Tenderer understands that scour assessment and scour study for both projects is perfumed and contained in C256-RA-N-RB-00002_02 which can be considered by the Tenderer as a basis for further work. Hence, Tenderer scope of work is only limited to review of this report by performing a scour protection analysis and then advise the type and extent of scour protection required. Supply and installation of scour protection is not in Tenderer's scope of work. Please confirm that Tenderer's understanding is correct.Seabed and subsurface boulders are known to be present at the two sites due to the geological setting (ref. §2.3 of C274-RA-G-RA-01000). Company highlights this as a geohazard risk for pile refusal (ref. table 4-2 of PM735-PMS-050-001). NGI further elaborate on the risk of boulder anomalies for each soil unit in figure 5.1-1 of C274-NG-G-IC-00006. The current design assumes any surface boulders, if present within the footprint of the jacket, are removed prior to jacket installation. Please confirm that surface boulder removal will be complted by Company if required.With respect to subsurface boulders, the current design assumes that piles can be driven to target penetration without refusing on boulders.Any impact of remedial drilling, if it were to be required, is not accounted for in the design. It's proposed this will also be the base case for the detailed design. Please confirm Company is in agreement.Please also confirm that the responsibility of offshore mitigation measures, in the event of early pile refusal due to boulders remains with the Company.The Topside shall be a complete OSS topside module including Materials, Company’s Materials, internal and external sea-fastening, grillage and export cables (EC) and inter array cables (IAC) pull-in system and winch(es)Dummy Plug shall be installed onshore for sealing during Transportation, avoiding physical damage, keeping water tightness and maintaining perfectlydry. At offshore, IAC Cables shall be connected in pluggable joint through IAC Pluggable connectors.Note 4: 220kV CABLES ARE SUPPLIED BY EXPORT CABLE CONTRACTOR & INSTALLATION AND ACCESSORIES ARE CONSIDERED IN MTO.The LV utilities in scope will connect to the SUS as shown in [8].The control system and HMI system of a utility system are connected to a Service Management Network and a Telecom Technical Network provided by the SCADA as depicted in [8] and in Figure 6-3Flashing visual yellow color beacons shall be installed where the noise level can be above 85 dB.GA loop design shall adapt the same philosophy followed in ONS during detailed design.OSS Contractor responsibility is to design the offshore substation access control and intruder system in line with ONS philosophy.Access control and intruder system installed in OSS shall allow only authorized personnel in OSS to prevent unauthorized access to facilities, equipment and documents for personnel safety and to safeguard against sabotage, damage and theft.From Company Q&A Tenderer notes - Question #166 and EMPLOYER requirements: "The overall maintenance strategy for the OSS is that scheduled inspection and maintenance activities are carried out as a maintenance campaign every 12 months, supported by vendors to optimize logistics and overall efficiency. OSS and OSS systems are designed for low personnel intervention and minimal planned maintenance and fault-finding visits."From Company Q&A Tenderer notes - Question #167 and EMPLOYER requirements: "The overall maintenance strategy for the OSS is that scheduled inspection and maintenance activities are carried out as a maintenance campaign every 12 months, supported by vendors to optimize logistics and overall efficiency. OSS and OSS systems are designed for low personnel intervention and minimal planned maintenance and fault-finding visits."From Company Q&A Tenderer notes and agrees with Question #170: Regarding the content of Appendix 2 Maintenance Plan, the CONTRACTOR believes that the hours assessment (in the Opex & Availability Estimate Report) for the inspection of the topside appears to be low.The CONTRACTOR understands that these hours are intended for visual inspections only.From Company Q&A Tenderer notes and agrees with Question #171: Regarding the content of Appendix 2 Maintenance Plan, the CONTRACTOR believes that the hours assessment (in the Opex & Availability Estimate Report) for the inspection above the splash zone appears to be low, especially when the Maintenance Strategy document specifies the use of ROV/Dive boat for inspections, including marine growth, coating damage, J-tube plug, and cable abrasion.The EMPLOYER is to provide clarification.“As we are looking at the jacket design, we realize that the amount of sacrificial anodes is growing rapidly, even with a partially or fully painted jacket.For this reason, we intend to design the jacket based on an ICCP system. We will make sure that temporary power for the system will be available offshore, as the jackets and topsides are installed in separate campaigns. We would like to discuss with Company whether this way forward is agreed as basis for our offer.”It is indicated that the ESI SCADA can remotely activate the FiFi from the onshore control station. But according to DNVGL-ST-0145, activation/deactivation/inhibition actions in the FAS/FiFi can not be performed from the ESI SCADA, just monitoring/supervisory actions are allowed. More in detail:According to “DNVGL-ST-0145, Chapter 6.7.1”, if shutdown actions are performed by the fire and gas detection system, the requirements of DNVGL-OS-D202 for the shutdown system apply to the fire and gas detection systems.According to “DNVGL-OS-D202, chapter 2, section 2, paragraph 1.1.3”, whenever automatic or manual shutdown is required, the function shall be implemented in a safety system (e.g. FAS, FiFi) that is mutually independent of the control and alarm systems (e.g. ESI SCADA).Please clarifyTENDERER CLARIFICATION - A set of telecom systems are listed in paragraph 5.1.1 of C274-RA-J-XI-01000-01_F02 - WIND FARMS Automation ESI SCADA Interface Topology, but other documents indicate in some areas contradicting information. We would like to get clarification and understand which of these systems are in scope and which are out of scope to make a complete offer. Kindly clarify for each of the systems the scope boundaries for the EPC contractor (see Annex 1).The FEED MTO does not include quantities for surge arresters and its boxes.The MTO indicates cable class 2 when cable cross section is less or equal 35mm2, and cable class 5 when cable cross section is bigger than 35mm2.The MTO indicates that the HVAC switchboards P-82EL002A&B shall be form 4b.This document indicates that 10 (ten) rooms shall be protected by the Inert gas system.This document indicates that the Power Management System (PMS) is a stand alone (independent) system.In the MTO data (type, length) for the communication cables (e.g. CAT6A) and FO cables, is not included.This document indicates that Fluorine foam type shall be used.The document includes marine lanterns and fog signals in the topology.Tenderer has provided an optimised Jacket design proposal, as part of our tender submission. Please refer to Tender Attachments 5.12.4 - 5.12.8 In particular 5.12.8 Design Justification Statement - JacketFrom Company Q&A Tenderer notes #99 Question:Contractor would like to clarify what is the scope related to monitoring equipment on substructure as mentioned in section 4.10.1For our pricing we have used a Main platform crane of Polish supplier PROTEA.Furthermore, we see a large price difference with suppliers such as Palfinger and Motus (used as reference crane in Ramboll documents).In case there is a preference for Company to include for the Motus crane to align with Ramboll FEED, then please note that this comes with a high price increase