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Page 1 of 20 MUGLAD BASIN OIL DEVELOPMENT PROJECTEPCPIPELINE SYSTEM- SEGMENT A & BCONTRACT NO. MBOD/DS/03A/97SPECIFICATION FOR ATMOSPHERIC STORAGE TANKSBEIJINGCHINA SPECIFICATION FOR ATMOSPHERIC STORAGE TANKSDOCUMENT NO. SD-AB-E-MA-SP-7001GREATER NILE PETROLEUM OPERATING CO.KHARTOUM NORTH, SUDANMUGLAD BASIN OIL DEVELOPMENT PROJECT,EPC PIPELINE SYSTEM-SEGMENT A&B REVISIONDATEREVISION DETAILSPREPARED BYCHECKED BYAPPROVED BY0APPROVED CHEN XIANGQIU WANG BAOXIA MA DANKE MUGLAD BASIN OIL DEVELOPMENT PROJECT PIPELINE SYSTEM GNPOCDEPARTMENT:ENGINEERINGDOCUMENT No.SD-AB-E-MA-SP-7001REV. 0 Page 20 of 20CONTENTS1.0SCOPE2.0CODES, REGULATIONS AND STANDARDS3.0DEFINITIONS4.0DESIGN5.0MATERIALS6.0 DIMENSIONAL TOLERANCE7.0FABRICATION8.0STRUCTURAL/FOUNDATION9.0 INSPECTION AND TESTING10.0 CLEANING11.0CALIBRATION REQUIREMENTS12.0QUALITY AND RECORDING DOCUMENT REQUIRED TO SUBMIT13.0EQUIPMENT TAGGING14.0PREPARATION FOR SHIPMENT1.0SCOPEThis specification describes the requirements for the materials, design, fabrication and installation of all atmospheric storage tanks, including diesel fuel tanks, sump tanks, treated water tanks and diesel day tanks.2.0CODES, REGULATIONS AND STANDARDS2.1Supplier shall meet or exceed the requirements of the latest edition of the following codes, regulations and standards, except as superseded herein. In cases where more than one code, regulation or standard apply to the same condition, the most stringent shall be followed. In the event of a conflict between this specification and other specifications or correspondence, the OWNER/CPECC shall be consulted and a ruling, in writing, shall be obtained before any work is started. API Spec. 12F - Shop Welded Tanks for Storage of Production Liquids Guide for Inspection of Refinery Equipment, Chap. XIII - Atmospheric and Low-Pressure Storage Tanks Regulations, Codes and Statutes of Authority having jurisdiction in location of installation ASTM A194 Class 2H NUTs for Sweet Service API Std 2000 - Venting Atmospheric and Low-Pressure Storage Tanks API Std 650 - Welded Steel Tanks for Oil Storage API Std 2550 - Method For Measurement and Calibration of Upright Cylindrical Tanks 2.2The following General Specifications shall be used in conjunction with this specification where applicable: SD-AB-E-MA-SP-7002 Equipment Welding SD-AB-E-MA-SP-7014 Piping Material SD-AB-E-MA-SP-7007 Insulation SD-AB-E-MA-SP-7008 Above-ground pipeline and equipment coating material in stations SD-AB-M-CO-CI-0001 Civil construction procedure2.3Any deviation from this specification shall be approved, in writing, by OWNER/CPECC. Such written approval shall be obtained prior to the commencement of any work which would constitute such a deviation.3.0DEFINITIONS3.1 OWNEROWNER means the Consortium, comprising China National Petroleum Corporation, PETRONAS Carigali Overseas Sdn Bhd, State Petroleum Corporation and SUDAPET Limited (SUDAPET), and its agents or designated representatives including OGP Technical Services Sdn Bhd or any of their assigns.3.2 CPECCCPECC means China Petroleum Engineering & Construction Corporation, the contractor of MUGLAD BASIN OIL DEVELOPMENT PROJECT, EPC II PIPELINE SYSTEM SEGMENT A & B.3.3 SupplierSupplier means the company that provides the equipment or materials to OWNER/CPECC for this project.3.4 WorkmanshipWork shall be carried out in accordance with code requirements and industry standards for good workmanship.4.0 DESIGN4.1 Design TemperatureDesign Temperature of diesel fuel tanks, diesel day tanks and treated water tanks shall be specified as 100C500C. Design Temperature of sump tanks shall be specified as 250C750C.4.2 Corrosion AllowanceCorrosion allowance shall be specified as 1.6 mm.4.3. Tell Tale Holes4.3.1 Reinforcing PadsTell tale hole, 1/8 NPT, shall be provided as follows: One hole in all single piece reinforcing pads. Where pads are split, each section shall have one hole.4.3.2 Closed-In AreasThe lower part of reinforcing pads or closed in areas shall be left open to provide a tell tale hole.4.4 Nozzles and Manways4.4.1Weld Seams and Plate JointsNozzles and manways shall not be made in weld seams, nor shall reinforcement pads overlap plate joints.4.4.2 Manway SizeManways shall be a minimum size of 24. 4.4.3 Nozzle TypeNozzles 2 and larger shall be seamless long welding neck flanges or seamless pipe with welding neck flanges. Slip-on only on manways.4.4.4 Threaded ConnectionsConnections 1-1/2 nominal pipe size and smaller shall be threaded except where flanged instrument connections are specified and shall be at least equivalent to 3,000 psi forged steel couplings on half couplings.4.4.5Minimum SizeConnections shall be a minimum of 1 with the fittings at least equivalent to 3,000 psi forged steel and the pipe schedule 80 minimum to the first valve. For internally coated tanks, the minimum connection size shall be 2” flanged.4.4.6 Connection Wall ThicknessNozzles, handholes, and manway connections shall have a minimum wall thickness equivalent to extra strong pipe.4. 4.7Nozzle ProjectionThe projection of nozzles and manways from the tank shall be measured from the outside of the tank of the flange face, not be less than dimension B as shown in Table 1. Where the vessel is externally insulated, dimension B shall be increased by the thickness of the insulation.TABLE 1 Connection SizeDimension B2 3 and 466 to 12 inclusive8Over 12 and manways10 4.4.8Maintenance and handling RequirementsLifting lugs shall be provided.4.4.9Holes in Plates Holes shall not be cut in plates for erection purposes.4.5Dipping, venting, relief and vacuum openings The size and location of dipping, venting, relief and vacuum openings, if required, shall be addressed in relevant Data sheet. 4.6Supports The supports of diesel fuel tanks shall be saddles. The supports of diesel day tanks shall be columns. The sump tanks and treated water tanks shall be flat bottom.4.7Wind girdersWind girders shall not need.4.8Heating requirementThe sump tanks shall be heated by Heating trace.5.0MATERIALS5.1 PipePipe shall be in accordance with SD-AB-E-MA-SP-7014 Piping Material.5.2 Bolts and NutsBolts and nuts for atmospheric storage tanks shall conform to: ASTM A 193 Gr. B7 complete with ASTM A 194 Class 2H nuts for sweet service ASTM A 193 GR. B7M complete with ASTM A 194 Class 2HM nuts for sour service5.3 GasketsThe material of Gaskets shall be accordance with SD-AB-E-MA-SP-7014 Piping Material.Gaskets compressed composition: 1/16” thick up to and including 18 1/8” thick larger than 185.4 GroundingThe frame shall be connected to the power system grounding grid, using ground Taps consisting of minimum 20# AWG, green TW insulated stranded copper cable.6.0 DIMENSIONAL TOLERANCEThe proposal of the tolerances given as followings is to produce a atmospheric storage tanks of acceptable appearance.6.1 Dimensional tolerance of cylindrical tanks Cylindrical tanks include diesel fuel tanks .6.1.1 Elliptic and conic headThe thickness of elliptic and conic head after formation shall not be less than 90 percent of normal thickness.The formation dimensional tolerance shall not exceed the allowable value given as Table 6.1.1 and Figure 6.1.1.Figure6.1.1.aFigure6.1.1.bThe allowable of dimensional tolerance after formation Table 6.1.1Diameter(mm)from 2600 to 3199from 3200 to 4000Di(mm)66Dimax - Dimin (mm)910bi(mm)44h2(mm)-3 to +5-3 to +5h1(mm)1620H(mm)77Note: h1: The height of curved surface of elliptic head;h1: The high tolerance of curved surface of elliptic head;h2: The latitude of cylinder of elliptic and conic head;h2: The latitude tolerance of cylinder of elliptic and conic head;H: The total height of elliptic and conic head;H: The total high tolerance of elliptic and conic head; Di: The inside diameter of elliptic and conic head; Di: The inside diameter tolerance of elliptic and conic head; Dimax : The maximum diameter of measurement. Dimin : The minimum diameter of measurement;bi : Concavity and convex of elliptic and conic head surface;6.1.2 CylinderThe thickness of cylinder after formation shall not be less than 90 percent of normal thickness.The dimensional tolerance of different shown as Figure 6.1.2 between maximum and minimum diameter of measurement in the same section after welding shall not exceed 0.5 percent of normal diameter.Figure 6.1.2Misalignment in completed cylinder shall not exceed 2.5mm for the longitudinal welding, and 2mm for circumference.The edge formed by longitudinal butt-welding joints of cylinder, shall be measured by outside and inside templet whose chord has a length of 1/6 times Di and minimum 300 mm, the value of E (shown as Figure 6.1.3) shall not exceed ()mm . The edge formed by circumferential butt-welding joints of cylinder, shall be measured by steel straightedge which has a length of minimum 300 mm, the E shall not exceed the value mentioned above (shown as Figure 6.1.3).Figure 6.1.3.aFigure 6.1.3.b6.2 Rectangle tanksRectangle tanks include sump tanks, diesel day tanks.6.2.1 Shell plateThe dimensional tolerance of shell plate in edge length shall not exceed2mm, diagonal line length shall not exceed3mm;6.2.2 FabricationThe shell plate (including side wall and bottom plate) shall be reinforced by reinforcement in order to reduce concavity and convex of shell plate. The concavity and convex shall not exceed 10mm.6.3 Vertical cylindrical fixed roof tankThis type tank includes treated water tanks.6.3.1 ShellThe butt welding shall be applied in shell, misalignment in completed shell shall not exceed 0.5mm for the longitudinal and circumference welding, and the continue length of misalignment area shall not exceed 100mm.The dimensional tolerance of shell plate in edge length shall not exceed2mm, diagonal line length shall not exceed3mm;The Concavity and convex of shell surface shall not exceed 10mm.The height tolerance shall not be exceed the 0.5 percent of the total height, the verticality shall not be exceed 0.4 percent of the total height, and not exceed 50mm.6.3.2 Bottom The tank bottom shall be flat, lap joint shall not be acceptable.The Concavity and convex of bottom surface shall not exceed 2 percent of the deformation length, and not exceed 50mm after welding.6.3.3 Fixed roof Conic roof shall be applied, lap joint shall not be acceptable.The tolerance shall be accordance with 6.1.1 conic head.6.3.4 StairwayStairway shall be necessary for vertical cylindrical fixed roof tank, and the dimension shall be accordance with APPENDIX D of API Spec. 12F Shop Welded Tanks for Storage of Production Liquids.7.0 FABRICATION7.1Welding7.1.1 Procedures and QualificationsWelding shall not be performed prior to CPECCs approval of procedures and qualifications. SD-AB-E-MA-SP-7002 Equipment Welding codes are a minimum requirement.7.1.2 CleaningAll burns, projections of weld metal, weld scale and spatter shall be completely removed.7.1.3For internally coated tanks, lap welding is not permitted for surfaces to be internally coated. Internal surfaces and welding shall be free of sharp corners and porosity. 7.2 Coating7.2.1 Surface preparation and coating shall conform to SD-AB-E-MA-SP-7008 Above-ground pipeline and equipment coating material in stations.7.2.2 Internal Coating as per SD-AB-E-MA-SP-7008 Above-ground pipeline and equipment coating material in stations.7.3 InsulationThe diesel fuel tanks and diesel day tanks shall be insulated in accordance with SD-AB-E-MA-SP-7007 Insulation.8.0 STRUCTURAL/FOUNDATION8.1 Specifications and Codes All structures shall conform to SD-AB-M-CO-CI-0001 Civil construction procedure.8.2 Ladders, Platforms and RailingsThe Supplier shall meet the requirements of APPENDIX D of API SPEC. 12F.8.3Foundation Foundation design shall be in accordance with SD-AB-M-CO-CI-0001 Civil construction procedure9.0 INSPECTION AND TESTING9.1 General(a)Supplier is responsible for inspection and testing but the OWNER/CPECC reserves the right to inspect the tanks at any time during fabrication to ensure that material and workmanship are in accordance with the governing codes and this specification.(b) All materials shall have tracebility.(c) Supplier shall have CPECC approved manufacturing sequences, inspection and testing procedures.9.2Radiographs(a) Radiograph shall be applied for butt welded joints. The length covered by RT shall not be less 20% of total length for long welding and shall be 100% for junctions.(b) All radiographs taken during fabrication shall be available to OWNER/CPECC and OWNER/CPECC reserves the right to approve final radiographs and request additional radiographs.9.3Hydrotesting and Other NDE9.3.1 The attachment welding around all nozzles and their reinforcements shall be inspected by magnetic-particle method.9.3.2 The fresh water required for hydrotesting and the temperature of water for testing shall not be lower than 50C.9.3.3 The pressure of hydrotesting shall be accordance with DATA SHEET. If not specified in DATA SHEET, the pressure shall be in accordance with API 12F, but tank shall be full of water.9.3.4 When water is introduced into tank, the air staying in tank shall be removed through venting, vent shall be installed on the top of tank and the outside surface of tank shall be kept dry during hydrotesting.9.3.5 The test pressure shall raise slowly, and after reaching the value specified, the pressure shall be kept for 1 hour. All joints and connections shall be inspected. If leakage are found, the defects shall be repaired and hydrotesting shall be repeated again.9.3.6 After hydrotesting, water in tank shall be drained immediately, and tank shall be wiped by cloth to get dry.10.0CLEANINGAfter fabrication, all loose foreign material such as sand, scale, weld spatter and cutting chips shall be removed from the inside and the outside. The supplier shall make a visual inspection to make sure that proper cleaning has been accomplished.11.0CALIBRATION REQUIREMENTSThe calibration of atmospheric storage tanks shall be in accordance with API Std 2550 Method For Measurement and Calibration of Upright Cylindrical Tanks.12.0 QUALITY AND RECORDING DOCUMENT REQUIRED TO SUBMIT12.1 An Inspection and Test Plan (ITP) shall be prepared by Supplier for tests required by specifications or data sheets.12.2 Supplier shall conduct its standard shop tests, in addition to other specific tests required by specifications or data sheets. 12.3 Supplier shall record test results listed below and other test documentation. Supplier shall maintain a record of shop test data for at least 18 months after date of shipment.Certified copies of test data shall be submitted to OWNER/CPECC. Hydrostatic or pneumatic test procedure Nondestructive test procedures Welding procedure for shop, field (if any) and repair welds; welder qualification Surface preparation and painting procedure (shop and fields) Repair procedure Code compliance certificate Hydrostatic test certificate Code data reports Test records for nondestructive testing Material test certificates Inspection and test plan Material test certificates (including impact testing) Calibration table13.0 EQUIPMENT TAGGINGEach complete tanks shall be provided with a corrosion resistant nameplate securely attached to a bracket which is fixed to the tanks shell and so located that it is readily visible and accessible after installation. Insulated tanks should have one piece nameplate brackets with enough projection to insulation by at least 25 mm.This nameplate shall contain the following data: