180530-00-ME-SPC-0008-A1

PETROM SA EXPLORATION &

PRODUCTION DIVISION

PROJECT NO: 180530

DOC NO: 180530–00–ME–SPC-0008-A1 PAGE 1 OF27

REV. DATE DESCRIPTION BY CHK APP’D CLIENT 0 06/02/08 ISSUED FOR INTERNAL REVIEW SH GD PC 1 08/02/08 ISSUED FOR CLIENT REVIEW SH GD PC A 18/02/08 APPROVED FOR DESIGN SH PC PC A1 04/03/08 APPROVED FOR DESIGN SH PC PC

ENGINEERING SPECIFICATION

DOCUMENT TITLE: STORAGE TANK SPECIFICATION

PROJECT DESCRIPTION: FEED AND PRE-FEASIBILITY STUDY FOR SURFACE PRODUCTION SYSTEMS IN OIL AND GAS

ORIGINATOR: S.HODDER

DATE: 06 FEB. 08


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REVISION DESCRIPTION SHEET

Rev. Para. Revision Description

Hold No. Para. Description of Hold


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Contents

1. EXECUTIVE SUMMARY .......................................................................6

1.1 Project Outline.......................................................................................6

2.0 SCOPE...................................................................................................7

2.1 Definitions..............................................................................................7

2.2 Units ......................................................................................................7

2.3 Abbreviations.........................................................................................7

3.0 REGULATIONS AND CODES...............................................................8

3.1 Statutory Regulations ............................................................................8

3.2 Design and Fabrication Codes ..............................................................8

3.3 Alternative Codes ..................................................................................8

3.4 Codes & Standards ...............................................................................9

3.5 Project Specifications ..........................................................................10

4.0 DESIGN ...............................................................................................10

4.1 General................................................................................................10

4.2 Tank Shells..........................................................................................11

4.3 Tank Bottoms ......................................................................................12

4.4 Tank Roofs ..........................................................................................12

4.5 Corrosion Allowance ...........................................................................13

4.6 Nozzles and Connections....................................................................13

4.7 Anchor Bolting .....................................................................................14

4.8 Structural Steel....................................................................................14

4.9 Tank Insulation ....................................................................................15

4.10 Heating coils........................................................................................15

4.11 Instruments..........................................................................................15

4.12 Level and temperature telemetry.........................................................16

5.0 CONE ROOF/DOME ROOF TANKS WITHOUT INTERNAL FLOATING ROOFS .............................................................................16

5.1 General................................................................................................16

5.2 Appurtenances and Accessories .........................................................16


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6.0 EXTERNAL FLOATING ROOF TANKS ..............................................17

6.1 General................................................................................................17


7.0 COVERED FLOATING ROOF TANKS (INTERNAL FLOATING ROOFS) ...............................................................................................18

7.1 General................................................................................................18


8.0 MATERIAL...........................................................................................19

8.1 General................................................................................................19

8.2 Supplementary Materials.....................................................................19

8.3 Gaskets ...............................................................................................19

8.4 Bolting .................................................................................................20

8.5 Sour service ........................................................................................20

9.0 FABRICATION ....................................................................................20

9.1 General................................................................................................20

9.2 Welding ...............................................................................................20

9.3 Filler Materials .....................................................................................21

9.4 Tolerances...........................................................................................21

10.0 ADDITIONAL REQUIREMENTS FOR EPOXY & RUBBER LINED TANKS.................................................................................................21

11.0 CATHODIC PROTECTION..................................................................22

12.0 INSPECTION, REJECTION, EXAMINATION, REPAIRS AND TESTING..............................................................................................22

12.1 Inspection ............................................................................................22

12.2 Quality Plan .........................................................................................22

12.3 Rejection .............................................................................................23

12.4 Examination.........................................................................................23

12.5 Repairs ................................................................................................23

12.6 Testing ................................................................................................23

13.0 MARKING, PAINTING AND SHIPPING ..............................................24

13.1 Marking................................................................................................24

13.2 Painting ...............................................................................................24


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13.3 Preparation and Shipment...................................................................24

13.4 Shipping ..............................................................................................25

14.0 DRAWING & DOCUMENTATION REQUIREMENTS .........................25

14.1 General................................................................................................25

14.2 Language ............................................................................................25

15.0 GUARENTEE.......................................................................................26

15.1 General Requirements ........................................................................26

16.0 NAMEPLATE.......................................................................................26

16.1 Type ....................................................................................................26

16.2 Content................................................................................................26


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CONTENTS

1. EXECUTIVE SUMMARY

PETROM have issued a reimbursable engineering contract to WorleyParsons to provide a Front End Engineering Design (FEED) and EPC ITT documentation for the Central and East Region OSPS Facilities consisting of 284 Parks contained within 23 Projects (22 in Central Region and 1 in the East). In addition, Pre-feasibility Studies leading to future FEED design work are to be carried out on 92 Parks (contained within 15 Projects) for the Western Region as well as for 45 Tank Farms in the three regions (2 in the Eastern Region; 38 in the Central Region; and 5 in the Western Region).

1.1 Project Outline

The Project Scope is comprised of the modernisation or abandonment of existing Park facilities. Modernisation consists of complete replacement of the existing Park facilities, sized to present production capacities. The Park facilities will be designed to be of modular construction, the modules to consist of PETROM design for manifold only (PMAN) or one of five metering point (MP) designs as put forward by PETROM. In addition, there are five Metering Point Production (MPP) designs covering 20 Park facilities in the Central and East Regions that are to be evaluated for abandonment, modernising, upsizing or downsizing in addition to others in the Eastern Region that are to be identified. Given the size and complexity of these facilities, only partial modularisation is expected. Work on the West Region Parks will culminate in a Pre-feasibility Study following a detailed data gathering exercise and verification of the same. There are 92 Parks contained in 15 Projects that will be assessed for upgrade or abandonment. The 45 Tank Farms are to be examined for upsizing, downsizing, modernisation or abandonment and will also culminate as a Pre-feasibility Study.

The scope of work begins at the manifold inlet to the Park facilities and continues through to the delivery points of the Tank Farms or MPP’s; i.e. pipelines and wellheads upstream of the manifolds upstream are not considered. However, interconnecting and delivery pipelines will have to be considered in the overall assessment of the project.


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2.0 SCOPE

This specification covers the minimum requirements for the design, materials, fabrication, inspection, testing and documentation for Atmospheric Storage Tanks in accordance with SR EN 14015.

2.1 Definitions

• The Contractor is the party who carries out all or part of the design, engineering,

procurement, construction, commission or management of the project, or operation or maintenance of a facility.

• The Manufacturer/Supplier/Vendor is the party who manufactures or supplies

equipment and services specified by the Contractor / Company

• The Company is the party who owns and operates the equipment.

• The Notified Body is the inspection body with the responsibility for ensuring that the European Directive requirements are met.

• The word shall indicates a requirement.

• The word should indicates a recommendation.

2.2 Units

The S.I. (System International) system of units shall be used as the official units throughout all documentations with the exceptions as shown on data sheets and piping specifications.

2.3 Abbreviations

ITP Inspection and Test Plan MP Metering Point MPP Metering Point Production MT Magnetic Particle Testing NDE Non Destructive Examination PED Pressure Equipment Directive PT Penetrant Testing PRV Pressure Relief Valve PWHT Post Weld Heat Treatment


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RT Radiographic Testing UT Ultrasonic Testing VRV Vacuum Relief Valve WFMT Wet Fluorescent Magnetic Particle Testing

3.0 REGULATIONS AND CODES

All work specified shall be in accordance with the applicable sections of the latest

editions of the Regulations, Codes and Standards (and their current amendments), listed below or referenced in this specification, except where modified or supplemented by requirements noted in this specification.

3.1 Statutory Regulations

EU Directive Equipment intended for use in potentially explosive atmospheres 94/9/EC (ATEX) EU Directive Pressure Equipment Directive (PED) 97/23/EC (See note in paragraph 3.3)

3.2 Design and Fabrication Codes

SR SR EN 14015 Specification for the Design and Manufacture of Site Built, Vertical,

Cylindrical, Flat-bottomed, Above Ground, Welded, Steel Tanks for the Storage of Liquids at ambient or above

SR EN 1993-4-2 Eurocode 3: Design of Steel Structures – Part 4-2: Silos, Tanks and

Pipelines – Tanks

3.3 Alternative Codes

Alternative codes can be used if there is a proven economical incentive or the design parameters fall outside that of the design and fabrication codes above. This shall require written acceptance by the Company.

API 12B Bolted Tanks for Storage of Production Liquids API 12F Shop Welded Tanks for Storage of Production Liquids API 620 Design and Construction of Large, Welded, Low Pressure Tanks API 650 Welded Steel Tanks for Oil Storage


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Note: Tanks having a maximum design pressure above 500 mbar (but no greater than

1000 mbar) will be manufactured in accordance with API 620 and shall comply with the European Directive 97/23/EC (PED).

3.4 Codes & Standards

API 653 - Tank Inspection, Repair, Alteration and Reconstruction API 2000 - Venting Atmospheric and Low Pressure storage Tanks: Non

refrigerated and Refrigerated ASME B-16.5 - Steel Pipe Flanges and Flanged Fittings ASME B16.47 - Steel Pipe Line Flanges ISO 10474 (EN 10204)

- Metallic Products – Types of Inspection Documents

ISO 12944 - Paints and Varnishes – Corrosion Protection of Steel Structures by Protective Paint Systems

NACE MR-01-75 (ISO 1516)

- Material Requirements – Sulphide Stress Cracking Resistant Materials for Oil field Equipment

NFPA 30 - Flammable and Combustible Liquids RP-01-93 - External Cathodic Protection of On Grade Carbon Steel Storage

Tanks Bottoms RP-05-75 - Internal Cathodic Protection Systems in Oil Treating Vessels SR EN 571 - Non Destructive Testing. Part 1: Penetrant Testing. General

Principles SR EN 583 - Non Destructive Testing. Ultrasonic Examination. Part 1: General

Principles SR EN 1568-1 SR EN 1568-2 SR EN 1568-4

- Specification for low (4), medium (1) and high (2) expansion foam concentrates for surface application to water-immiscible liquids.

SR EN 1713 - Non Destructive Examination of Welds. Ultrasonic Examination Characterisation of Indications in Welds

SR EN 1779 - Non Destructive Testing – Leak Testing – Criteria for Method and Technique Selection

SR EN 12501 - Protection of Metallic Materials against Corrosion. Corrosion Likelihood in Soil Part 1: General

SR EN 13636 - Cathodic Protection of Buried Metallic Tanks and Related Piping SR EN 25817 - Arc-welded Joints in Steel. Guidance on Quality Levels for

Imperfections SR EN 60079 - Electrical Apparatus for Explosive Atmospheres. Part 10:

Classification of Hazardous Areas SR EN ISO 5817 - Welding – Fusion-welded Joints in Steel, Nickel, Titanium and their

Alloys (Beam Welding excluded) – Quality Levels for Imperfections SR EN ISO 9934 - Non Destructive Testing – Magnetic Particle Testing – Pat 1: General

Principles SR EN ISO 14122 - Permanent Means of Access to Machinery SR EN ISO 15614 - Specification and Qualification of Welding Procedures for Metallic

Materials


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NP 099-04 - Normative for the Design, Execution, Verification and Operation of

Electrical Installations in Potentially Explosive Areas SR ISO 7507-1 SR ISO 7507-2 SR ISO 7507-3

- Petroleum and Liquid Petroleum Products. Calibration of Cylindrical Tanks. Part 1: Strapping Method Part 2: Optical Reference Line Method Part 3: Optical Triangulation Method.

3.5 Project Specifications

180530-00-IN-PHL-0001 - Automation and Telecom Philosophy 180530-00-PR- PHL-0008 - Storage Tank Philosophy 180530-00-ME- PHL-0001 - Sparing Philosophy 180530-00-ME-SPC-0001 - Pressure Vessel Specification 180530-00-ME- SPC -0003 - Painting and Coating Specification 180530-00-ME- SPC -0004 - Insulation Specification 180530-00-ME- SPC -0005 - Nozzle Loads 180530-00-ME- SPC -0007 - Heat Tracing Specification 180530-00-ME-SPC-0009 - Welding Specification 180530-00-ML-SPC-0001 - Cathodic Protection Specification 180530-00-ML-DEG-0001 - Material Selection Guide

4.0 DESIGN

4.1 General

• Tanks shall be designed in accordance with SR SR EN 14015 and all codes, standards

and specifications listed therein. • The design life shall be a minimum of 25 years or as specified on the tank data sheet.

• Tank Vendors shall check the acceptability of loads on shell openings in accordance with

project specification 180530-00-ME-SPC-0005, Nozzle Loads.

• Normal and emergency venting shall be in accordance with SR EN 14015 Annex L. Under normal operating conditions it shall not be possible to isolate the venting system from the tank, and the venting system shall be sized to prevent the design pressure and the design internal negative pressure of the tank being exceeded for all operating conditions. If extremely high outbreathing rates are necessary due to a fire on the external surfaces of the tank or malfunction of special tank equipment (e.g. tank blanketing system), additional emergency relief valves shall be used, or the tank shall meet the requirements of Annex K. Area provided by gauge hatch opening might be considered for emergency venting capacity when suitable gauge hatch is provided with self-closing cover.

https://ukprojects.worleyparsons.com/hydrocarbons/petrom_osps/5%20Approved%20Deliverables/F1.1%20Standards%20and%20Specifications/180530-00-ME-PHL-0001-A%5b1%5d.pdf








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• Tanks constructed of stainless steel shall comply with SR EN 14015 and shall have a

minimum of spot radiography examination. 4.2 Tank Shells

• Tank shell thickness shall be calculated in accordance with SR EN 14015. • Shell seams shall be located to clear openings to the maximum extent possible in

accordance with SR EN 14015, so as to avoid post weld heat treatment.

• The top angle shall be attached to the shell by a full penetration butt weld. The outstanding leg of the top angle shall extend outside the tank unless otherwise specified on drawings or data sheets.

• When roof to shell junction is not frangible in accordance with Annex K, the tank

fabricator shall provide emergency venting devices in accordance SR EN 14015, Annex L.

• Tank shells shall be designed to resist buckling from the design wind velocity without

intermediate wind girders unless otherwise specified by the Purchaser.

• Tank shells shall be furnished with a minimum 600 mm inside diameter manhole in accordance with Table 1. Table 1: Tank Manholes

TANK DIAMETER [meters] Over Through

NUMBER OF MANHOLES

0 22.9 1 22.9 45.7 2 45.7 3

• The minimum tank shell thickness shall not be less than the greater of:

o Thickness values given in Table 16, Paragraph 9.1.5 of SR EN 14015.

o Values computed by the formulae in Paragraph 9.2.2 of SR EN 14015.

• When tank is constructed of alloy steel or stainless steel other than those included in SR

EN 14015, the allowable stress shall be specified by the Vendor, on the tank drawings or data sheets.


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• Un-anchored tanks located in an area subject to flooding shall have the tank foundation

elevated sufficiently enough that the flood water level above the tank bottom will not cause uplifting of the tank shell when the tank is empty.

4.3 Tank Bottoms

• Bottom plates may be lap-welded with the lap toward the direction of drainage. Butt welded bottom plates shall be furnished when specified on the tank drawings or data sheets or when tanks are specified to have rubber lining.

• When the upper rim of draw off sump is constructed in accordance with SR EN 14015

and the tank is rubber lined, alternative detail 1, Figure O.5 shall be furnished.

• Annular bottom plates may be butt welded in accordance with SR EN 14015 if required by the Purchaser or if the tank is to be rubber lined.

• Tank bottoms should have a design gradient no greater than 1:100 unless otherwise

specified (see A.1, SR EN 14015). For tank bottoms with a gradient greater than 1:100, the design and foundation should be subject to agreement (see A.2, SR EN 14015). Consideration should be given to the operating conditions, the anticipated level of settlement, and the type of foundation employed.

4.4 Tank Roofs

• The preferred fixed roof configuration (cone or dome or umbrella) will be specified on the tank drawings or data sheets. When the Purchaser has specified a cone roof, the Tank Vendor may propose a clearly labelled alternate dome roof or umbrella roof design if it is more economical. When dome or umbrella roof is specified, the roof radius shall be between 0.8 and 1.5D, where D is the nominal diameter of tank unless otherwise specified.

• When tanks are specified to have an internal rubber or epoxy lining, the roof shall be self-supporting or have an external supporting structure.

• Roofs plates shall have single lap-welded joints welded on the outside. The lap joints shall be seal-welded on the inside when the roof is specified to have epoxy lining. Butt welded roof plates shall be furnished when specified on the tank drawings or data sheets or when roof is specified to have rubber lining.

• When tanks are located in areas subjected to earthquakes, the roof rafters of a supported roof, made of channel or angle sections, shall be provided with suitable bracing in accordance with SR EN 14015.

• Roof columns and roof framing for column supported cone roof tanks shall be designed to accommodate, for differential settlement of tank bottom and the increase in column


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height of 7 mm per meter of the column distance from tank shell regardless of whether the tank bottom is flat or sloping.

4.5 Corrosion Allowance

• For each surface in contact with product/vapour, the specified corrosion allowance shall

be added to the required thickness of all load-carrying components including shell, roof, bottom and roof supports.

• One-half of the specified corrosion allowance shall be added to each surface of non

load-carrying internal components.

• Table 16 – Minimum Specified Nominal Shell Thicknesses, Paragraph 9.1.5 of SR EN 14015; these specified thickness requirements are needed for construction purposes and therefore may include any corrosion allowance, provided that the shell is shown by calculation to be safe in the corroded condition in accordance with 9.2.

4.6 Nozzles and Connections

• Flange bolt hole orientation shall be as follows:

• When the flange is in a horizontal plane, the bolt holes shall straddle the north-south and east-west centrelines.

• When the flange is in a vertical plane, the bolt holes shall straddle the vertical centreline of the flange.

• Bolt hole orientation of flanges not specified above will be shown on the design drawings.

• Raised face and flat face flanges shall be furnished with a stock gasket surface finish.

• Flanges for external nozzles NPS 24 and smaller shall be in accordance with ASME B16.5 for the rating and type of facing specified. Flanges for external nozzles NPS 26 through NPS 60 shall be in accordance with ASME B16.47, Series B. For sizes over NPS 60, flange dimensions will be shown on the drawings or data sheets. Manway flanges shall be in accordance with SR EN 14015.

• Each reinforcing pad, or segment if more than one piece is used, shall be provided with one NPS 1/4 NPT threaded hole. Welds in segmented two-piece reinforcing pads on shell and conical roof shall be in the circumferential direction. The outside edge of reinforcing pads shall be ground or otherwise made reasonably smooth before welding to the tank.

• Threaded connections, when permitted, shall be Class 6000 couplings.

• All threaded connections shall have NPT threads conforming to ASME B1.20.1.


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4.7 Anchor Bolting

• Anchor bolting shall be designed for uplift due to internal pressure. An allowable tensile stress of 103.4 MPa on the root area of the thread is to be used. Allowable stress may be increased by 33% for wind or earthquake loading.

• For anchored tank, anchor chairs or anchor straps shall be provided and installed on tank shell by Tank Vendor. Purchaser will arrange for the supply and installation of anchor bolts or installation of anchor straps into the tank foundation.

4.8 Structural Steel

• Tanks 6.0 m or less in height shall be furnished with a ladder. The ladder shall be fitted with a cage when:

o height of the ladder flight is more than 3.0m; o height of the ladder is 3.0m or less, but at the departure area there is the risk of

falling an additional distance. In this case, the total distance of fall from the upper level of the ladder could be more than 3.0m.

• Tanks greater than 6.0 m in height shall be furnished with a spiral stairway. Spiral

stairways on insulated tanks shall be furnished with an inside stringer; the treads shall not be welded directly to the shell.

• A landing platform (gauger's platform) shall be furnished at the top of the ladder or spiral stairway. Wing rails extending 2.0 m from the edge of the platform (on two sides along the circumference of the tank) shall be furnished.

• Dome roof tanks or cone roof-tanks with roof slope greater than 1:4 shall be furnished with walkways extending from the landing platform to the centre of the roof or to the other roof platforms for the maintenance of roof mounted accessories, when shown on the tank drawings. Unless otherwise shown on tank drawings, the walkway may be in the form of anti-skid bars welded to the roof plate with handrails provided on both sides of walkway.

• All walkways, stairways, and platforms shall be furnished with handrails on open or exposed sides.

• Platforms shall be designed for a uniform live load of 3.6 kN/m2.

• Unless otherwise specified on tank drawings or data sheets, the platform and stairway flooring shall be galvanised, rectangular, welded grating with 25 mm x 5 mm bearing bars on 30 mm centres and cross bars on 100 mm centres. If checker plate is specified, it shall be 6 mm thick.


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4.9 Tank Insulation

When a tank is required to be insulated, Purchaser will specify the thickness and type of insulation or a basis for designing the insulation system, in accordance with project specification180530-00-ME-SPC-0004, Insulation Specification. The insulation supports for shell and roof insulation shall be provided in accordance with the details shown on the tank drawings. Heat tracing requirement shall be as per P&ID’s and project specification 180530-00-ME-SPC-0007, Heat Tracing Specification. Junction boxes as required for connection of power and control cables for trace heating shall be provided. Power supply available at voltage level 400V/230V +/-10% AC, 3 phase + Neutral, 50Hz +/-5% and UPS power at 230V AC.

4.10 Heating coils

Tubes shall be butt welded together; the use of flanges or other threaded fittings is not permitted on the inside of the tanks. For floating-roof tanks or tanks with an internal screen, the tubes shall be positioned so as to provide clearance for the supporting legs and allow free operation of the central drain, where applicable. The tubes shall be secured to a sufficient number of supports resting on the bottom using bolted clamps positioned so as to allow free expansion of the assembly. The supports shall be seam welded to the bottom, if necessary by means of a plate if the stress is too great and/or the bottoms are thin. The tubes forming the coil shall be spaced no more than 600 mm apart. The heating coils shall be installed only after the bottom has been tested. The heating or cooling circuit for the product contained in a tank may be considered as pressure equipment and should be designed, manufactured, installed and tested in accordance with project specification 180530-00-ME-SPC-0001, Pressure Vessel Specification. It should also undergo a pressure test as required by the rules connected with the heat transfer product which it contains.

4.11 Instruments

All connections for the assembly of level instrumentation taps, alarms, temperature sensors, etc., shall comply with project specification 180530-00-IN-PHL-0001. Also reference Petrom Standard EP-IN-06-PH, Philosophy for Tank Instrumentation.


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4.12 Level and temperature telemetry

Tanks may require roof nozzles allowing for the installation of telemetry facilities. The location of nozzles and the equipment installation shall be approved and shall be in accordance with the job specification which will define the type of equipment to be used.

5.0 CONE ROOF/DOME ROOF TANKS WITHOUT INTERNAL FLOATING ROOFS

5.1 General

• Roofs of unlined tanks (no rubber lining or epoxy coating) may be self-supporting or supported at the option of the Tank Vendor unless otherwise specified on tank drawings or data sheets.

• If pipe or other closed structural shapes are used to support roofs, they shall have a vent

at the top and a drain at the bottom.

• Normal and emergency venting shall be per SR EN 14015 Annex L. 5.2 Appurtenances and Accessories

Cone roof and dome roof tanks shall be furnished with the following:

• The number of 600 mm inside diameter roof manholes as specified in Table 1, Paragraph 4.2.

• One water draw off sump with internal piping and shell nozzle.

• 8 inch (200 mm) diameter gauge hatch with self-closing non-sparking cover.

• One ground-reading automatic level gauge with digital readout, float, and float guide wire

assembly or when specified on tank drawings or data sheets, a level indicator with indicator board, float and guide wire assembly.

• A scaffold cable support for tanks over 5.5 m high.

• Four grounding (earthing) lugs.

• Free vents with stainless steel bug screen for atmospheric tanks or, when specified,

pressure vacuum vent valve(s) equipped with car seal open block valves(s) on the tank side, for blanketed or low pressure tanks.

• Foam chambers and foam piping, when specified.


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• Tank heaters, internal piping, and shell nozzles, when specified.

• Emergency vent when required.

• Level alarms and level transmitters when specified.

6.0 EXTERNAL FLOATING ROOF TANKS

6.1 General

• The roof shall be either a pontoon type or double deck type. The top edge of all bulkhead plates shall be welded for liquid tightness. Roof shall be contact type to eliminate the presence of any air-vapour mixture under the deck.

• Roof seal material shall be suitable for the stored products.

• Wind girders shall be furnished with drain holes. The wind girders shall be checked for drainage during tank testing. When the Tank Vendor has the tank filled as required with the testing fluid, he shall then run water into the wind girder with a hose. Within 15 minutes, the girder shall be checked to see if all the water has drained through the regularly supplied drain holes. If water stands over 1.5 mm deep on any portion of the wind girder, an additional drainage hole shall be drilled in the lowest spot in that area so that complete drainage will result.

6.2 Appurtenances and Accessories

External floating roof tanks shall be furnished with the following:

• The number of through-deck manholes for access to the inside of the tank as specified below:

TANK DIAMETER [meters] Over Through

NUMBER OF MANHOLES

0 45.7 2 45.7 3

• One manhole to be the minimum size necessary to service (remove) the roof drain

assembly, but not less than 600mm inside diameter. The remainder shall be 600mm inside diameter.

• One water draw-off sump with internal piping and shell nozzle.

• One 8 inch (200 mm) diameter gauge hatch with self-closing non-sparking cover. Hatch cover shall be capable of being opened from the gauger's platform.


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• One-ground reading automatic level gauge with digital readout, float, & float well.

• Automatic floating roof vents.

• Rim vents under mechanical primary seal.

• A guide device to prevent rotation of the roof.

• A roof drain extending to a shell nozzle in form of articulated pipes unless hose pipe is specified on tank drawing or data sheets.

• Emergency roof drains for double deck floating roof.

• Adjustable roof support legs for a high (maintenance) setting of 2.0 m and a low (operating) setting as determined by the Tank Vendor to clear internals, mixers, etc. The support legs shall be provided with bearing plate at bottom for internally lined tanks.

• A rolling ladder with self-levelling treads to permit access from the landing platform to the deck of the roof.

• One 500 mm inside diameter size manhole in each pontoon.

• Positive electric bond from the floating roof deck to the tank shell.


7.0 COVERED FLOATING ROOF TANKS (INTERNAL FLOATING ROOFS)

7.1 General

• The internal roof shall be either a steel pontoon type, or aluminium pontoon type, or an aluminium honeycomb type. Roof shall be contact type to eliminate the presence of any air-vapour mixture under the deck.

• Roof seal material shall be suitable for the stored products. 7.2 Appurtenances and Accessories

Internal floating roof tanks shall be furnished with the following:

• The number of both fixed roof and floating roof manholes shall be per SR EN 14015.

• One water draw off sump with internal piping and shell nozzle.

• 8 inches (200 mm) diameter gauge hatch with self-closing non-sparking cover and combination slotted gauge pole/roof anti-rotation pole.

• Internal ladder to permit access from the fixed roof to the deck of the floating roof.

• One ground-reading automatic level gauge with digital readout float, and float well.

• A scaffold cable support for tanks over 5.5 m high.


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• Automatic floating roof vents.

• Free vents and circulation vent openings with stainless steel bug screens for atmospheric tanks per SR EN 14015 or, when specified, pressure vacuum vent valve(s) equipped with car seal open block valve(s) on the tank side for blanketed or low pressure tanks.

• Adjustable roof support legs for a high (maintenance) setting of 2.0 m and a low (operating) setting as determined by the Tank Vendor to clear internals, mixers, etc. The support legs shall be provided with bearing plate at bottom for internally lined tank.

• Positive electric bond from the roof deck to the tank shell.

• Flexible foam seal or rubber lip seals as appropriate based on tank content and size. For internally lined tank, flexible foam seal shall be used.

• Foam chambers and piping, when specified.

• Tank heaters, internal piping, and shell nozzles, when specified.

• Shell nozzles and supports for side entering mixers, when specified.


• Emergency vent when required by Anne L of SR EN 14015.

• Level alarms and level transmitters when specified.

8.0 MATERIAL

8.1 General

All material shall be new and as specified on tank drawings or data sheets. Use of alternate materials per Annex F of SR EN 14015 is subject to prior, written approval by Purchaser. For epoxy or rubber lined tanks, the material for internals, appurtenance and accessories in contact with the stored liquid/vapour shall be compatible with the product.

8.2 Supplementary Materials

The Tank Vendor shall furnish blind flanges, manhole covers, bolts, and gaskets including one spare gasket for all manholes and all other nozzles specified to be furnished with blinds.

8.3 Gaskets

Gaskets shall be 3mm thick, flexible graphite sheet with a tang stainless steel reinforcement foil unless otherwise specified on tank drawings or data sheets. The


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gasket material shall be compatible with the stored product and shall be of a non-asbestos material.

8.4 Bolting

Pressure bolting shall be in accordance with EN 1515. Pressure bolt heads and nuts shall be heavy hex.

8.5 Sour service

Tanks that are identified on the data sheet as being in sour service shall comply with the requirements stated on the equipment data sheet and Equipment purchase requisition and all requirements of NACE MR 0175/ISO 15156 (latest edition).

9.0 FABRICATION

9.1 General

• Holes shall not be cut into the shell for erection purposes.

• Plate misalignment shall not be corrected by grinding off plate thickness to reduce offset.

9.2 Welding

• Welding shall be in accordance with the applicable project specification 180530-00-ME-SPC-0009, Welding Specification.

• Fabrication involving welding shall not be sublet to others without the prior approval of the Purchaser.

• Vertical shell welds shall be impact tested at the test temperature required for the plate material and shall show not less than the value required for the thicker plate material. When connections are made between materials of different thicknesses or different grades, then the impact requirements for the weld metal shall be the more stringent of the two.

• Horizontal shell welds shall be impact tested at the test temperature of the thicker plate material being joined or at –10 °C, whichever is the least stringent, and shall show not less than 27 J.

• Arc strikes on the tank shall be avoided. When they occur the surface shall be conditioned to eliminate surface stress raisers and shall be examined by the magnetic particle or liquid penetrant method.

• Weld bevels for stub end nozzles shall be in accordance with the details and standards specified on the tank drawings or data sheets.


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9.3 Filler Materials

Welding rods, electrodes, and wires shall be selected in accordance with project specification 180530-00-ME-SPC-0009, Welding Specification.

9.4 Tolerances

Tank nozzles shall be installed within the following tolerances:

• Projection from the inside of the tank to the face of flange ±3 mm.

• Elevation or orientation ±6 mm.

• Flange tilt in any plane ±1/2 degree but not to exceed 5.0 mm.

• For hillside nozzles, from face of flange to centreline of tank and from centreline of tank to centreline of nozzle ±6 mm.

• Flange bolt hole orientation ±1.5 mm.

10.0 ADDITIONAL REQUIREMENTS FOR EPOXY & RUBBER LINED TANKS

• For epoxy lined tanks, all internal welds shall be ground smooth. Weld defects are not

acceptable.

• All edges shall have a minimum of 3.0mm radius.

• All internal surfaces shall be seal welded. Skip welds are not acceptable.

• All surfaces shall be free of weld spatter. Undercuts, pinholes, gouges and pits shall be filled with weld metal.

• Tank internals that require bolted connections shall be of corrosion resistant materials. This also includes all internal bolts, nuts and washers.

• Internals that cannot be easily blast cleaned and lined, such as piping elbows, long lengths of pipe, gauge wells, and floating roof support legs shall be made of corrosion resistant material.

• When tank roof is not lined, a supported roof may be used if the roof rafters are not in contact with product and the roof columns are lined similar to tank shell and bottom. The contacting surfaces between column bases and tank bottom shall be lined with a suitable corrosion resistant alloy before the application of lining material.

• Long weld neck or slip on flanges are preferred. Weld neck nozzles may be used provided the internal nozzle neck to flange weld can be ground smooth and flush. Nozzle necks and pipes made from plates shall have all internal weld reinforcement ground smooth and flush.

• For rubber lined tanks, the minimum nozzle size shall be NPS 4.


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• For epoxy lined tanks, the minimum nozzle size shall be NPS 3, unless otherwise

indicated on tank drawings or data sheets. Nozzles smaller than NPS 3 shall be of a corrosion resistant alloy and shall project a minimum of 25 mm into the tank.

• Threaded, carbon steel connections shall not be used for nozzles.

• Corrosion inhibitors and coatings shall not be applied to surfaces to be lined.

• Carbon steel pad type (studded outlet) flanges may be used for nozzles sizes NPS 2 and larger for epoxy lined tanks only.

• Steam and heater connections shall be designed to keep the temperature to which the lining will be exposed to below the maximum permissible for the lining material. Tank Vendor shall submit design details for review and acceptance by Purchaser before the commencement of fabrication.

• Lining application shall commence only after tank is hydrotested, cleaned, and dried thoroughly.

11.0 CATHODIC PROTECTION

When a tank requires Cathodic protection the method adopted shall be carried out in accordance with project specification 180530-00-ML-SPC-0001, Cathodic Protection Specification.

12.0 INSPECTION, REJECTION, EXAMINATION, REPAIRS AND TESTING

12.1 Inspection

All materials and fabrication work shall be subject to inspection (shop and site) by the Purchaser. The Tank Vendor's drawings shall be made available to the Purchaser's inspector at the time of inspection.

12.2 Quality Plan

The tank Vendor shall submit an Inspection and Test Plan (ITP) prior to fabrication. The Vendor shall set out a step by step inspection program for the Contractor’s approval. This program shall be in accordance with the provisions of EN 10145 and shall itemise all required stages of design; procurement, fabrication and inspection with hold points.


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12.3 Rejection

• Completed tanks, parts of tanks, or materials containing defects originating with the Tank

Vendor's design, materials, or workmanship; or that are not in complete compliance with the requirements of the Purchase Order will be rejected.

• Discovery of such conditions after inspection and acceptance of the tank by the Purchaser does not relieve the Tank Vendor of his responsibility to comply with the requirements of the Purchase Order.

12.4 Examination

• When complete or spot radiographs are taken at plate junctions, the film shall show at least 51 mm of weld length on each side of the vertical seam. At least 50% of the spot radiographs taken on vertical seams shall include intersections with horizontal seams.

• The welds attaching the shell plate to the bottom plate shall be inspected by the magnetic particle or liquid penetrant method.

12.5 Repairs

• Welds with defective areas shall have: o the defect removed o confirmation of defect removal by magnetic particle or liquid penetrant

examination o repair welding using qualified welding procedures o re-post weld heat treatment if originally required.

• The finished weld-repair shall be radiographed if originally required, and the surface shall be re-examined by magnetic particle or liquid penetrant examination. If the repair involves serious alterations, the approval of the Purchaser shall be obtained before proceeding with the repair.

12.6 Testing

• Testing shall be in accordance with SR EN 14015.

• Prior to the hydrotest, the inside of the tank shall be cleaned by sweeping, vacuuming, or other methods so that the tank will be "broom clean" and free of all trash, dirt, welding rod stubs, and other construction debris.

• The Tank Vendor shall be responsible for conducting the tank hydrostatic test. Any limitations on filling rates or stage filling requirements for foundation consolidation will be specified by the Purchaser.

• The hydrotest shall be conducted with all accessories and appurtenances installed.


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• Tanks constructed of austenitic stainless steel or austenitic stainless clad material shall

be hydrotested with potable water only, with maximum chloride content of 250 ppm; no salt, brackish, or raw river water shall be used. Parts of a tank that cannot be completely drained shall be flushed with boiler condensate or demineralised water having a maximum chloride content of 30 ppm.

• Tanks constructed of carbon steel shall not be hydrotested with salt, brackish, or raw river water.

• After completion of the hydrotest, the Tank Vendor shall drain the tank and open the tank for inspection.

13.0 MARKING, PAINTING AND SHIPPING

13.1 Marking

• Stamping on all steel materials (and impact tested materials) shall be with "low stress" steel stamps having round or "U" shaped cross sections or with "interrupted dot" die stamps.

• Marking paint or water insoluble ink for use on austenitic and high nickel alloy steels shall contain no substance (e.g., metallic pigments, sulphur, or chlorides) which would be harmful to these materials at ambient or elevated temperatures. The Tank Vendor shall submit analysis of marking material to the Purchaser. Submittal shall demonstrate (by chemical analysis and history of use) that the material meets these requirements.

• Tank Vendor shall provide nameplate in accordance with Paragraph 20.2 of SR EN 14015.

13.2 Painting

Surface preparation and painting shall be in accordance with the project specification 180530-00-ME-SPC-0003.

13.3 Preparation and Shipment

• All machined and threaded surfaces of carbon steel materials shall be coated with vendor standard rust preventative.

• Weld bevels of carbon steel materials shall be coated with vendor’s standard weldable corrosion inhibitor.


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13.4 Shipping

Requirements and responsibilities for transporting material to the construction site shall be as specified in the Purchase Order.

14.0 DRAWING & DOCUMENTATION REQUIREMENTS

14.1 General

• Specific instructions and requirements for vendor drawings and data will be issued by

the detailed engineering contractor.

• Acceptance of Vendor drawings and data with details which deviate from those shown on Purchaser's drawings, data sheets or specifications does not constitute acceptance of the deviations. Tank Vendor shall obtain separate written approval from Purchaser for all such deviations, prior to submission of drawings and data, for Purchaser's review and acceptance.

• On completion of fabrication, the Vendor shall supply the Purchaser with copies of the final drawings and data, as specified. These shall include:

o Assembly and detail drawings (showing as-built dimensions and details), design calculations and weights.

o Manufacturer’s Data Report for Tanks o Certified records showing location, heat numbers and chemical and physical

properties of all materials used. o Copy of post weld heat treatment recording o Copy of hydrostatic test chart o Copy of NDE test results o Copy of Positive Material Identification (PMI) log

14.2 Language

All technical documentation shall be in English. With reference to PED (if required) the following shall apply:

• Declaration of Conformity: English • Certificate of Conformity: English • Nameplate: English • Safety related marking and warnings (e.g. "Do Not Touch"): Romanian and English • Operating instructions: Romanian and English • All other documentation: English


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15.0 GUARENTEE

15.1 General Requirements

• The Vendor shall guarantee that all equipment furnished is free from fault in design,

materials and workmanship.

• The vendor shall promptly correct or replace, to the full satisfaction of the Purchaser any and all defects found in the design, materials or workmanship within the periods specified in the purchase order; at no cost to the purchaser.

16.0 NAMEPLATE

16.1 Type

Tanks shall be provided with a stainless steel nameplate, fastened by stainless steel screws or rivets to a nameplate bracket which has been welded to the tank.

16.2 Content

The nameplate shall be engraved with the following information (as a minimum):

• manufacturer’s company’s name and address

• serial No;

• design standard (SR EN 14015: 2004);

• year of manufacture;

• tank identification mark;

• diameter, in m;

• design density, in kg/l;

• design pressure, in mbar;

• internal negative pressure, in mbar;

• design temperature, in °C;

• maximum design liquid level, in m;

• storage capacity, in m3.

• Type of internal lining (if applicable) On tanks fitted with a fixed heating or cooling circuit (see Annex P), an additional name-plate shall be:


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• fitted to the inlet or outlet connection of the circuit giving as a minimum:

• manufacturer’s company’s name and address;

• serial No;

• design standard;

• heat exchange area, in m2;

• volume, in m3;

• type of heat transfer medium;

• design pressure, in bar;

• design temperature, in °C. In addition to the above the nameplate shall state any other information that may be required for proper operation and maintenance.