specification-419-rev-4-storage-tanks.pdf - Neptune Energy

Neptune Energy Netherlands B.V.

Specification 419 rev. 4 of 10

TABLE OF CONTENTS

1.0 INTRODUCTION .............................................................................................................................. 3

1.1 GENERAL ........................................................................................................................................................... 3 1.2 SUPPLIER’S RESPONSIBILITY ..................................................................................................................... 3

2.0 CODES AND STANDARDS ............................................................................................................. 4

2.1 CODES, STANDARDS AND REGULATIONS .......................................................................................... 4 2.2 PROJECT SPECIFICATIONS ......................................................................................................................... 4 2.3 ORDER OF PRECEDENCE ............................................................................................................................. 4

3.0 SCOPE OF SUPPLY .......................................................................................................................... 5

4.0 ENVIRONMENTAL CRITERIA ......................................................................................................... 5

5.0 DESIGN REQUIREMENTS – MECHANICAL .................................................................................. 5

5.1 DESIGN REQUIREMENTS – PROCESS ..................................................................................................... 5 5.2 DESIGN REQUIREMENTS – MECHANICAL ........................................................................................... 5 5.3 LIFTING LUG DESIGN AND LOADOUT .................................................................................................. 7

6.0 FABRICATION REQUIREMENTS .................................................................................................... 7

7.0 MATERIALS ...................................................................................................................................... 7

7.1 GENERAL ........................................................................................................................................................... 7 7.2 BOLTING ............................................................................................................................................................ 7

8.0 INSPECTION, TESTING AND CERTIFICATION ............................................................................. 8

8.1 INSPECTION ..................................................................................................................................................... 8 8.2 WELD INSPECTION ........................................................................................................................................ 8 8.3 TESTING ............................................................................................................................................................. 8 8.4 NAMEPLATES ................................................................................................................................................... 9 8.5 CERTIFICATION DOCUMENTS .................................................................................................................. 9

9.0 PAINTING AND PREPARATION FOR SHIPMENT ..................................................................... 10

9.1 PAINTING AND PROTECTIVE COATINGS ........................................................................................... 10 9.2 PREPARATION FOR SHIPMENT .............................................................................................................. 10



1.0 INTRODUCTION

1.1 GENERAL

This specification covers the minimum requirements for the design, manufacture, testing and

supply of Storage Tanks 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 client approval, manufacture,

testing including full compliance with all applicable design codes and standards, including those

listed in section 2 of this document and the data sheets that form part of this document.



2.0 CODES AND STANDARDS

The tanks shall be designed and tested in accordance with the requirements of this specification,

the attached data sheets, other referenced project specifications and the following standards,

codes and statutory regulations.

2.1 CODES, STANDARDS AND REGULATIONS

Dutch Mine Regulations – October 2002

Arbowet (arbeidsomstandighedenwet)

ASME B16.5 Pipe flanges and flanged fittings

ASME B.1.20.1 Pipe threads - general purpose (inch)

ASME IX Welding and Brazing qualifications

AWS D1.1 Structural welding code

ASME II Materials

DIN 50049 Material testing

NEN-EN 10204 Metallic products, Types of inspection Documents

2.2 PROJECT SPECIFICATIONS

103 Supplier Document requirements

201 General Specification for Supply and Fabrication of Steel Structures, latest revision.

502 General Specification for Piping Fabrication and Pressure Testing, latest revision

503 General Specification for Pipe, Fittings and Valves, 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 case of conflict arising between this specification and its associated specifications, data sheets

and the aforementioned codes and standards, Supplier shall bring the matter to the Buyers

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.

All deviations from the requirements of the specifications, its attachments and reference codes

and standards shall be stated in the tender. In the absence of such a statement, full compliance

will be assumed.

Compliance by the Supplier with the provisions of this specification does not relieve him of the

responsibility to furnish equipment and accessories of a proper mechanical design suited to

meet the specified service condition and/or local codes governing health and safety.



3.0 SCOPE OF SUPPLY

Supplier shall be completely responsible for all the materials supplied for the tanks and for

ensuring their delivery within the manufacturing schedule in order to meet the agreed finished

delivery dates.

“Scope” shall include, as a minimum, the following:

Tank design and fabrication as per section 5.0 and 6.0 including and datasheets.

Tank supply, including attachments as per data sheets;

Internal and external surface preparation and coating;

Supply reinforcing, base frame, all studs, bolts, nuts and gaskets as indicated on the data

sheets;

Supply of extra gasket for all manways;

Preparation and presentation of documentation as per Supplier Documents Requirements

(Neptune Energy specification 103);

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 to furnish details of their recommended design of proprietary equipment based on

the proven design for the data indicated on data sheets.

Clips for ladders, standpipe supports and platforms, if required.

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 tank will be located outside and be subject to a saliferous marine environment, ambient

temperatures 20C to +26C.

5.0 DESIGN REQUIREMENTS – MECHANICAL

5.1 DESIGN REQUIREMENTS – PROCESS

For detailed process data see data sheets.

5.2 DESIGN REQUIREMENTS – MECHANICAL

The mechanical design and engineering, fabrication, inspection and testing shall be executed in

accordance with the codes and Client/Manufacturer standards for the design conditions and

requirements as specified in this specification.

This specification to be used in conjunction with the tank data sheets and the referenced

information listed together with other specifications as per section 2.0.

Welding shall be to American Welding Society Code DI.I or national equivalent.



Prior to assembly scale shall be removed from the inside walls of all tanks by means of blasting.

Tank shall include lifting lugs, nameplate and a set of ladder mounting clips which shall be

attached to the tank side, if indicated on the datasheet.

The tanks will be supported/located on the deck steelwork.

Mechanical Design Requirements storage tanks:

Tank

T-

1305A/B T-1308 T-1307 T-1303 T-1396 T-1310 T1365A/B T-1306

Contents Po

tab

le w

ate

r

Skim

mert

an

k

(dra

inw

ate

r /

hyd

roc.

)

Die

sel

Meth

an

ol

Gly

col

Co

rro

sio

n in

h.

Lu

be o

il

Ste

am

clean

er

beack

tan

k

(wate

r)

Material tank &

nozzles SS316-L

SS316-

L CS CS CS CS SS316-L SS316-L

Coating Outside Yes Yes Yes Yes Yes Yes Yes Yes

Inside No Yes Yes No No No No No

Stiffening Roof Outside Outside Inside Inside Inside Inside Inside ? Inside ?

Walls Outside Outside Inside Inside Inside Inside Inside ? Inside ?

Bottom Outside Outside Outside Outside Outside Outside Outside Outside

Internals No Yes No No No No No No

Insulation Yes No No No No No No Yes

Tracing No No No No No No No No

Tanknumbers may differ, construction requirements are based on function / contents

Tankbottoms shall have slope 1:50 to the drainconnection

Nozzles shall be suitable for loads as indicated in datasheets

Pull-bar above manhole on inside and outside

Fabrication in line with GS 201 (structural) and 502 (piping) for welding, NDT, QA/QC, etc.

Fabrication tollerances nozzles : Plumb and level in any direction within 0.5°

Location ± 3 mm for elevation, 0.5° for orientation and ± 1.5mm for

projection

Coating per General Specification 525 with exemption of inside skimmertank & dieseltank

Coating inside skimmertank and diesel tank dedicated tank-coating for water / hydrocarbon service

Supplier shall design the tanks base for support section welded under and across the tank width.

These shall form an integral part of the tanks. The tank will be welded to the deck, therefore the

edges of the support frame will be ‘sharp’ to facilitate welding.

Secondary supporting and stiffening of the tanks shall ensure and be of such design that in all

other respects the tanks are self supporting and deflections are less than 1/300 of spans with

the tanks filled with water. All such steel if inside the tanks shall have “slotting” of bottom

members to ensure complete drainage.



5.3 LIFTING LUG DESIGN AND LOADOUT

For installation purpose the Tank shall be designed with lifting lugs for lifting and pulling. For

onshore installation (platform fabrication yard) tanks shall be equipped with padeyes for vertical

lifting. For offshore installation (existing platforms) 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.

6.0 FABRICATION REQUIREMENTS

As defined in referenced specifications.

7.0 MATERIALS

7.1 GENERAL

Materials shall be 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.

All mechanical tests shall be witnessed by the Buyer and/or the Certifying Authority and shall

include certificates, which shall be signed and stamped as witnessed.

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 that are 12 mm in diameter and smaller shall be stainless steel A4.



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 tank 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 Tank 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 and

Client/Manufacturer standard.

8.2 WELD INSPECTION

All welds shall be visually inspected after completion. Throat thickness of all fillet welds shall be

dimensionally checked.

Stainless steel including all attachment welds shall be 100% checked using dye penetrant.

Carbon steel including all attachment welds shall be 100% checked using MPI.

All duplex and stainless steel welds shall be pickled and passivated.

8.3 TESTING

Hydrostatic testing shall be performed by Supplier in accordance with agreed test and inspection

plan.

A suitable rust inhibitor and wetting agent shall be added to the test water.

When testing tanks with stainless steel materials fresh water should be used. In any cases the

maximum allowable chloride content of the test water shall be 20 ppm. The tell tale holes in the

reinforcing pads shall be left open after testing.

After hydro test the Tank shall be carefully rinsed with chloride free water and dried immediately.

Drying shall consist of wiping dry or air drying the inaccessible area. General hot air drying is not

required.



8.4 NAMEPLATES

A SS 316 nameplate, 3 mm thick, shall be provided with the following minimum information:

Buyer's equipment title, Purchase Order number and tag number

Fabrication serial number and year built

Weight (kg)

Empty

Operating

The SS 316 nameplate bracket shall be provided by Supplier and welded to the tanks. The

nameplate shall be securely fixed to this bracket.

Tanks tag number shall also be painted on the tanks itself (on all four sides) with large -

minimum letter height 200 mm - black letters (location to be decided by Buyer).

8.5 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 5 years after acceptance of the complete and

fully certified tanks by the 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”. All Data Books produced shall be

complete and copies submitted to the Buyer for review not later than 2 weeks after the date of

completion of the tests.

Support structure and stiffening, certification to DIN 50049, 2.2 Manufacturers certificate.



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 525 and KIWA

requirements.

9.2 PREPARATION FOR SHIPMENT

All machined surfaces and threaded connections shall be protected by coating with rust

preventative.

Flanged openings shall be protected with steel plate cover attached by proper bolting or

strapping and sealed with a plastic compound.

Screwed connections shall be protected with threaded forged steel plugs.

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-419-rev-4-storage-tanks.pdf - Neptune Energy

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