1.0 INTRODUCTION GENERAL SUPPLIER S RESPONSIBILITY CODES AND STANDARDS... 4

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2 TABLE OF CONTENTS 1.0 INTRODUCTION GENERAL SUPPLIER S RESPONSIBILITY CODES AND STANDARDS CODES, STANDARDS AND REGULATIONS NEPTUNE ENERGY NETHERLANDS B.V. SPECIFICATIONS ORDER OF PRECEDENCE CERTIFYING AUTHORITY SCOPE OF SUPPLY ENVIRONMENTAL CRITERIA DESIGN REQUIREMENTS FOR DETAILED PROCESS DATA SEE DATA SHEETS DESIGN REQUIREMENTS MECHANICAL LIFTING LUG DESIGN AND LOADOUT TRANSPORT CALCULATIONS FABRICATION REQUIREMENTS MATERIALS GENERAL BOLTING INSPECTION, TESTING AND CERTIFICATION INSPECTION WELD INSPECTION TESTING NAMEPLATES REPORTS AND ACCEPTANCE CERTIFICATION CERTIFICATION DOCUMENTS PAINTING AND PREPARATION FOR SHIPMENT PAINTING AND PROTECTIVE COATINGS PREPARATION FOR SHIPMENT Specification 401 rev. 4 Page 2 of 10

3 1.0 INTRODUCTION 1.1 GENERAL This specification describes the minimum requirements for the design, manufacture, testing and supply of a pressure vessel, including internals, to be installed on an offshore platform in the Dutch Sector of the North Sea. Tag Number: See datasheet 1.2 SUPPLIER S RESPONSIBILITY Supplier shall be responsible for the complete design, obtaining authority approval, manufacture and testing of the Pressure Vessel, including full compliance with all applicable design codes and standards, including those listed in Section 2.0 of this document and the requirements of the certifying authority. Specification 401 rev. 4 Page 3 of 10

4 2.0 CODES AND STANDARDS The requirements of codes, regulations and specifications listed below shall be met unless specifically excluded by these specifications and documents referred to herein. 2.1 CODES, STANDARDS AND REGULATIONS EU Pressure Equipment Directive 2014/68/EU EU Certification conform European Rules, including CE marking Dutch Mine Regulations October 2002 Dutch Rules for Pressure Vessels (RTOD) NEN-EN Unfired Pressure Vessels NEN-EN Metallic products types of inspection documents ASME B16.5 Steel Pipe, Flanges and Fittings ASME B Pipe threads - general purpose (inch) 2.2 NEPTUNE ENERGY NETHERLANDS B.V. SPECIFICATIONS 502 General Specification for Piping Fabrication and Pressure Testing, latest revision 503 General Specification for Pipe, Fittings and Valves, latest revision 518 General Specification for Insulation of Piping and Equipment, latest revision 524 General Specification for Coating of Threaded Fasteners, latest revision 525 General Painting and Coating Specification, latest revision 2.3 ORDER OF PRECEDENCE In the case of conflicting data between this specification, its associated data sheets and specifications and the aforementioned codes and standards, Supplier shall bring the matter to Buyer's attention for resolution and approval in writing. In all cases the most stringent requirements shall apply. Should any conflict occur as a result of complying with the data sheets and the specifications, the order of precedence shall be as follows: Data sheets This specification Other referenced project specifications Codes and Standards referred to within this specification and its attachments. 2.4 CERTIFYING AUTHORITY The certifying authority will be A Notified Body as defined in Directive 2014/68/EU (such NoBo could be Lloyds, Stoomwezen, etc.). Specification 401 rev. 4 Page 4 of 10

5 3.0 SCOPE OF SUPPLY Supplier shall be completely responsible for all the materials supplied for the vessel and for ensuring their delivery within the manufacturing schedule in order to meet the agreed delivery dates. "Scope" shall include, as a minimum, the following: Vessel design and fabrication as per section 5.0 and 6.0 including and data sheets. Supply of all internals as per data sheets. External surface preparations and coating. Supply of all blinds, studs, bolts, nuts and gaskets as indicated on the data sheets. Preparation and presentation of documentation as per Bid Document Appendices, including EC Declaration of Conformity, risk analysis, etc. Inspection and testing as indicated on the data sheets and in this document. The following activities shall also be part of Supplier's scope of work as a minimum: Supplier shall be responsible for the process and mechanical guarantees. Supplier to state max. flow allowable at min. pressure to guarantee separation efficiency. Supplier to furnish details of their recommended design of proprietary equipment based on the proven design for the data indicated on data sheets. The nozzle sizes given in the datasheet to be confirmed by Supplier. Supplier to advise separation efficiency. Clips for ladders, standpipe supports and platforms. Additionally an alternative design may be submitted for consideration in addition to the above if this design is more economical. 4.0 ENVIRONMENTAL CRITERIA The vessel will be located outside in processing area and be subject to a saliferous marine environment, ambient temperature 20 C to +26 C. Specification 401 rev. 4 Page 5 of 10

6 5.0 DESIGN REQUIREMENTS 5.1. FOR DETAILED PROCESS DATA SEE DATA SHEETS 5.2. DESIGN REQUIREMENTS MECHANICAL 2 The mechanical design and engineering, fabrication, inspection and testing shall be executed in accordance with the codes and standards for the design conditions and requirements as specified in this specification. The saddle design criteria shall be based on the vessel being full of water, all in accordance with the requirements of the Pressure Equipment Directive, Dutch Rules for Pressure Vessels and/or Unfired Pressure Vessels Norm NEN-EN The design, fabrication and inspection criteria shall be conform the requirements of Category IV, Module G of the pressure Equipment Directive. This specification to be used in conjunction with the vessel data sheets and the referenced information listed together with other specifications as per section 2.0. This specification does not relieve the fabricator of the responsibility of maintaining code requirements. The design shall be a cylindrical fabricated vessel, complete with skirt or saddle supports structure. Skirt design criteria shall be based on the vessel being full of water. 5.3 LIFTING LUG DESIGN AND LOADOUT For installation purpose the vessel shall be designed with lifting lugs for lifting and pulling. The lugs shall be designed for single point lift and 100% impact loading. Lugs shall be positioned for a balanced lift. Additional hoisting requirements or spreader bars shall be part of Supplier's scope of supply. The lifting lugs shall be subjected to an individual load test of twice the calculated load on the lug. On completion of the load test each lug shall be subjected to 100% UT and MPI examination. Lifting lug will be designed using the following criteria: calculated weight contingency factor 1.1 impact lifting factor: 2.0 a 25-75% split on the lifting loads should be applied to the two diagonals of a 4-sling single point lift. 5.4 TRANSPORT CALCULATIONS For the purpose of the vessel design the following load criteria shall be used: Transportation - Unless specified otherwise the equipment connection to the vessel and tie down points shall be designed for one (1) G lateral load in any direction in conjunction with 1.25 times the dead load. A load factor of 1.00 shall be used. Static load - The load should include vessel dead load and all equipment piping and supports piping reactions and liquid loads. For calculation a load factor of 1.10 shall be applied to all loads. Tow out - Tow out loadings shall be considered in the design of the vessel which shall be designed to withstand a force of ± 1.0 G at any time in any direction unless otherwise stated on data sheet. Specification 401 rev. 4 Page 6 of 10

7 6.0 FABRICATION REQUIREMENTS Fabrication will be according to the requirements of NEN-EN Unfired Pressure Vessels and further specifications and codes as indicated: All pressure vessels shall be 100% X-Ray include nozzle to shell weld. Nozzle shall be suitable for loads as indicated in datasheets. Nozzles are plumb and level in any direction within 0.5. The tolerance for nozzle location is ± 3 mm for elevation, 0.5 for orientation and ± 1.5 mm for projection. All reinforcing pads shall be provided with 0.25" API telltale hole for inspection for internal leaks, and shall be filled with grease. Pads are tested with air at 1.0 barg prior to post-weld heat treatment and final hydrostatic test. Reinforcing pads materials shall be the same as used for the shell/heads. 7.0 MATERIALS 7.1 GENERAL Materials shall be as per Unfired Pressure Vessels requirements and as indicated on the individual data sheet. Material certificates shall be supplied for all materials showing all test results required by the relevant material specification, Unfired Pressure Vessels requirements and referenced standards. 7.2 BOLTING Bolting to pressure containing parts shall be in accordance with the specifications 503 and 524. Bolts and nuts for structural parts shall be 8.8 or equal and shall be suitably coated except that all bolts and nuts 12 mm in diameter and smaller shall be stainless steel A4 (316L). Specification 401 rev. 4 Page 7 of 10

8 8.0 INSPECTION, TESTING AND CERTIFICATION 8.1 INSPECTION Supplier shall give at least 10 days notice to Buyer prior to the start of fabrication, hydrostatic test and any other inspections, as per the agreed test and inspection plan. Prior to the inspection of the vessel and before coating, all slag, loose scale, dirt, grit, weld spatter, paint, oil and other foreign matter shall be thoroughly removed so the inspection can be conducted to the best advantage. The approval of the work by Buyer's inspector and subsequent release of the vessel for shipment shall in no way relieve Supplier from the responsibility for carrying out all the provisions of this specification and/or the fulfilment of the code requirements. Defect discovered during inspection shall be rectified and repaired to Buyer's satisfaction. Detailed records of all tests shall be provided and become the property of Buyer. All inspection and testing shall comply with the requirements of the relevant design code. 8.2 WELD INSPECTION All welds shall be visually inspected after completion. Throat thickness of all fillet welds shall be dimensionally checked. Stainless steel and all attachment welds shall be 100% checked using dye penetrant. Weld overlay to have 100% U.S. examination and 100% check for porosity. All duplex and stainless steel welds shall be pickled and passivated. 8.3 TESTING Hydrostatic test shall be determined and performed by Supplier in accordance with the relevant code. During the test the temperature of the vessel and water shall not be lower than the Code recommendation. Standard type gaskets, relating to flange facing, shall be used. A suitable rust inhibitor and wetting agent shall be added to the test water. When testing vessels with stainless steel materials fresh water should be used. In any case the maximum allowable chloride content of the test water shall be 30 ppm. The telltale holes in the reinforcing pads shall be left open after testing. After hydrotest, the vessel shall be carefully rinsed with chloride free water and dried immediately. Drying shall consist of wiping dry or air drying the inaccessible areas. General hot air drying is not required. Specification 401 rev. 4 Page 8 of 10

9 8.4 NAMEPLATES In addition to the Pressure Equipment Directive requirements a SS 316 nameplate, 3 mm thick, shall be provided with the following minimum information: Buyer's equipment title, Purchase Order number and tagnumber Fabrication serial number and year built Design Code Weights (kg) Empty Operating PWHT (Post Weld Heat Treatment) The SS 316 nameplate bracket shall be provided by Supplier and welded to the vessel. The nameplate shall be securely fixed to this bracket. Vessel tag number shall also be painted on the vessel itself with large (minimum letter height 300 mm) black letters. 8.5 REPORTS AND ACCEPTANCE CERTIFICATION With regard to witnessed tests Supplier shall prepare a report on the tests and the results, these shall be included in the "Data Books". All Data Books produced shall be complete and copies submitted to Buyer for review not later than 2 weeks after the date of completion of the tests. 8.6 CERTIFICATION DOCUMENTS Supplier shall store in good order all material certificates, fully catalogued and indexed NDT test records, mechanical test certificates, welding qualification certificates, heat treatment certificates and hydrostatic test certificates for a minimum of 10 years after acceptance of the complete and fully certified vessel by Buyer. All certificates are to be available for counter signature by the certification authority nominated by Buyer. Copies of all certificates shall be included in the "Data Books". Specification 401 rev. 4 Page 9 of 10

10 9.0 PAINTING AND PREPARATION FOR SHIPMENT 9.1 PAINTING AND PROTECTIVE COATINGS Painting, protective coatings and the procedures for the preparation of surfaces shall be as specified in the general painting and coating specification, specification PREPARATION FOR SHIPMENT All machined surfaces and threaded connections shall be protected by coating with rust preventative. Flanged openings shall be protected with a rubber lined steel plate cover attached by proper bolting or strapping and sealed with a plastic compound. Supplier shall state in the proposal his recommendations for long term storage (up to 12 months) for both indoor and open air storage in a marine environment. Top cover, hand hole and vent blinds, shall be installed "as final". Bolting shall be torqued/tensioned as per specification 502. Specification 401 rev. 4 Page 10 of 10