1、., THE ENGINEERING EQUIPMENT AND MAYERIALS USERS ASSOCIATION SPECIFICATION FOR THE FABRICATION OF FOR OFFSHORE INSTALLATIONS NON-PRIMARY STRUCTURAL STEELWORK PUBLICATION No 197 : 1999 I EEMUAI 1 x THE ENGINEERING EQUIPMENT AND MATERIALS USERS ASSOCIATION SPECIFICATION FOR THE FABRICATION OF FOR OFFS
2、HORE INSTALLATIONS NON-PRIMARY STRUCTURAL STEELWORK PUBLICATION No 197 : I999 Copyright O 1999 The Engineering Equipment and Materials Users Association ISBN O 85931 111 2 I 45 Beech Street I LONDON EC2Y 8AD Telephone: 020 7628 7878 Fax: 02076287862 e-mail: saleseemua.co. uk we bsite: www.eemua.co.u
3、 k I EEMUAI - THE ENGINEERING EQUIPMENT AND MATERIALS USERS ASSOCIATION The Engineering Equipment and Materials Users Association-EEMUA-was formed in 1983 by the Amalgamation of the Oil Companies Materials Association (OCMA) and the Engineering Equipment Users Association (EEUA). It is an organisati
4、on of substantial purchasers and users of engineering products, whose members include leading national and multi-national companies in the petroleum, gas; chemical and energy industries. A list of Full and Associate Members (the latter being limited to membership of three technical committees) is gi
5、ven below. EEMUA is concerned with the design, installation, operation and maintenance of the engineering plant used by members in pursuing their business activities. The Association aims to reduce members costs by providing the opportunity for them to share resources and expertise in order to keep
6、abreast of technological developments and improve the effectiveness and efficiency of their engineering activities. EEMUA supports the British Standards Institution, works with other institutions, associations, government departments, regulatory authorities and the Confederation of British industry,
7、 and is also actively involved with other standards-making bodies, both national and international, such as the American Petroleum Institute. Work, which is carried out in-house by members alone or with the help of other organisations, may lead to the production of Association publications. These ar
8、e prepared primarily for members use, but are usually offered for sale and thus for more general use. Such publications may also be submitted, normally through the British Standards Institution, as bases for appropriate national, European or international standards. A list of current EEMUA Publicati
9、ons which may be purchased from the Association is given at the end of this document. Full Members Associate Members Associated Octel BG BP Amoc0 Caltex Petroleum Conoco Dow Corning Eastern Generation EssolExxonMobil Euech Foster Wheeler Energy Lindsey Oil Refinery National Power PowerGen Shell Astr
10、aZeneca BASF D this includes all attachments welded to the primary structure. Non-primary means all other components. Drawings are design drawings, or shop drawings approved for construction. 1.3 Abbreviations The following abbreviations are used in this Specification with meanings indicated below:
11、AC alternating current 3 Previous page is blank 1.4 1.5 STD-EEMUA PUB NO L77-ENGL 1999 W 57bb734 0001204 T87 AWS BS/BSI CE COSHH CSWIP ECIA EN GMAW GSFCAW GTAW HAZ HSC HV IS0 MPI NDT OCPCA PCN prEN PWHT SAW SI SMAW SSFCAW TS Units American Welding Society British Standardh Institution carbon equival
12、ent Control of Substances Hazardous to Health Certification Scheme for Welding Inspection Personnel Engineering Construction Industries Association European Standard gas metal arc welding gas shielded flux cored arc welding gas tungsten arc welding heat affected zone UK Health and Safety Commission
13、Vickers hardness International Organization for Standardization magnetic particle inspection (or examination) non-destructive testing The Oil and Chemical Plant Constructors Association (now ECIA) Personnel Certification in Non-destructive Testing pre- (i.e. draft) EN post-weld heat treatment (or tr
14、eated) submerged arc welding International System of Units shielded metal arc welding self-shielded flux cored arc welding tensile strength (ultimate strength) SI units are used throughout this Specification. Bar signifies gauge pressure. Glossary of Technical Terms The following technical terms are
15、 used within this Specification with the meanings indicated: Tubular Weld pass an assemblage of cans or seamless pipes forming a member or part of a member. a single progression of welding or surfacing along a joint or substrate. The result of a pass is a weld bead or layer. a joint welded from one
16、side only. a joint welded from both sides irrespective of the weld preparation. the indication of an imperfection or discontinuity revealed by NDT. Single-sided weld Double-sided weld : Flaw Defect an unacceptable flaw. 4 STD.EEMUA PUB NO 177-ENGL 1777 57bb73Li 0001205 915 1.6 References A list of d
17、ocuments referred to in the text is given under References on p. 29. The Contractor shall ensure that he has ready access to such documents. The latest editions including all published amendments current at the contract date (or at some other agreed date) shall normally apply. However where a specif
18、ic section/ clause of a document is referred to in the text of this Specification, the applicable edition of the document (including amendments) shall be that current at 1st August, 1999. 5 2 QUALITY ASSURANCE AND SAFETY 2.1 Quality Assurance The Contractor shall establish and maintain a quality ass
19、urance system accredited to the applicable standards in the BS EN IS0 9000 series, or an approved equivalent, to ensure that the goods or services supplied comply in all respects with the requirements of this EEMUA Specification. The Contractor shall verify that any Sub-contractor he employs shall h
20、ave an appropriate quality assurance system in place. In order to comply with the special processes requirement in 54.9 both of IS0 9001 : 1994 and IS0 9002 : 1994, it is recommended that the Contractor/ Sub-contractor operate a welding quality management system accredited to BS EN 729/ IS0 3834. 2.
21、2 Safety and Environment The Purchaser and Contractor shall, at all times, maintain awareness of the legislation and regulations concerning environmental issues and safe working practices, and comply with these in all fabrication and testing operations concerning constructions for offshore installat
22、ions. All parties shall institute and adopt the use of safe working practices and encourage, train and require their workforce and personnel to comply with such practices at all times. In particular, the attention of the responsible party is drawn to the dangers of ionizing radiations and the statut
23、ory requirement in the UK of a Competent Person to be appointed to be responsible for all operations involving the use, storage and transport of radioactive isotopes and X-ray machines. It is outwith the scope of this Specification to include a complete list of safety documentation covering fabricat
24、ion operations, but attention is drawn to the ECIA (previously OCPCA) Safety Manuals, to which reference is made in many contracts, both offshore and onshore. Attention is also drawn to the fact that ionising radiations are not the only hazard associated with nondestructive testing, and full complia
25、nce with general safety procedures and health and safety legislation is required at all times. In this context it should be noted that substances used in other NDT operations may also be notifiable in accordance with COS“. 7 Previous page is blaiik STD-EEMUA PUB NO L17-ENGL 1997 W 57bb734 OOUL207 79
26、8 W 3 3.1 3.2. 3.3 3.4 3.5 MATERIALS Weldable Structural Materials Steel plate, tubulars and sections shall be in accordance with BS EN 10025 or of suitable equivalent materials approved by the Purchaser. Welding Consumables All consumables shall comply with one of the following codes, or an approve
27、d alternative: GMAW AWS A5.18 GSFCAW AWS A5.201A5.29 GTAW AWS A5.18 Metal Powder SAW Wire and Flux : BS ENS 756 and 760 Shielding Gases BS EN 439 SMAW AWS A5.1 or A5.5 SSFCAW AWS A5.20 Any standard approved by the mirchaser Submerged arc fluxes shall be of the fully basic type, and shall not be used
28、 to make alloying additions to the weld metal. Miscellaneous Materiais-Bolts, Nuts and Washers The grades for bolts, nuts and washers shall be as specified on the Drawings. Materiais Substitution All materials used in the structure shall be of the grade and size defined by the Purchaser on the Drawi
29、ngs unless approval is given to alternative proposals made by the Contractor. Materials Handling-Receipt, Storage and Issue All materials and sub-assemblies shall be handled and controlled in accordance with the relevant procedures contained within the Contractors quality management system with due
30、regard given to traceability (if required by the Purchaser) and preservation of quality. All materials shall be stored in conditions which avoid damage and deterioration. 9 Previous page is blank 4 QUALIFICATION OF WELDING PROCEDURES AND PERSONNEL 4.1 General Requirements The Purchaser will consider
31、 for approval existing welding procedures qualified in accordance with or meeting the requirements of BS EN 288-3. New welding procedures for items in inspection category NP1 (see Table I, Sec. 8) shall be qualified in accordance with BS EN 288-3, while procedures for items in category NP2 may be qu
32、alified in accordance with BS EN 288-3 or 288-7. 4.2 Welding Procedure Qualification Tests Welding procedure qualification tests shall include a sufficient number of mechanical tests to demonstrate that the maximum hardness value of the weld and HAZ does not exceed 350 HV10 and that the mechanical p
33、roperties of the weld metal (yield strength, TS, elongation, Charpy values) are at least equivalent to the minimum values specified for the parent material. 4.3 Qualification of Welding Personnel 4.3.1 Welding personnel shall be qualified in accordance with BS EN 287-1. 4.3.2 The Purchaser will acce
34、pt existing qualifications in accordance with BS EN 287-1 and the following: (a) The test shall have been performed by the welder either while working for the present Contractor or while working for one who participates with the present Contractor in a formal scheme, recognised by the Purchaser, for
35、 mutual recognition of welder qualifications. Existing qualifications shall not be recognised if the welder ceases to work for Contractors participating in the scheme for a period in excess of six months. (b) If the test was performed more than six months previously, the certificate shall have been
36、re-endorsed by the present Contractor, or by one participating in the mutual recognition scheme, at intervals not exceeding six months to indicate that the welder has continuously used the process in production welding with satisfactory results. 11 Previous page is blank - STD.EEMUA PUB NO 197-ENGL
37、1979 H 57bb73Y OOOL209 5b0 5 CONSTRUCTION 5.1 General Requirements All construction work shall be undertaken in accordance with this Specification, the drawings, and relevant procedures approved by the Purchaser. 5.2 Preparation and Assembly 5.2.1 Handling Procedures Mechanical damage to the surface
38、s and prepared edges of materials and components shall be avoided. 5.2.2 Design of Welded Connections Except as noted on the Drawings, all butt welds shall be continuous and full penetration. Single-sided butt welds will normally be specified only for tubulars less than 600 mm internal diameter. Fil
39、let weld leg lengths and seal welding requirements will be specified on the Drawing s. 5.2.3 Forming and Straightening Any forming and/or straightening shall be performed using detailed procedures, with demonstrable controls, to prevent impairment of the materials properties to the extent that they
40、fall outside of specification requirements. 5.2.4 Edge Preparation Edges to be welded shall be prepared by machining, or by thermal cutting followed by grinding to bright metal. If the Contractor successfully qualifies all welding procedures using materials which have not been ground after thermal c
41、utting, the Purchaser may consider relaxing this requirement for edges to be welded. The surface of the steel within 75 mm of the proposed weld shall be dry, clean and free from loose scale or paint (except that the use of a protective primer may be permitted if used in all welding procedure qualifi
42、cation tests). Cut edges which are not subsequently welded shall be free from nicks and burrs. The use of flame gouging or washing is not permitted. 5.2.5 Alignment and Fit-up of Welded Joints Welded joints shall meet the requirements and tolerances of the welding procedure specification. Where fabr
43、ication aids are welded directly to the structure, documented welding procedures shall be employed. Removal of such aids shall be by cutting proud of the base metal surface, then grinding flush. Any root gaps in multi-pass fillets shall be compensated for by a corresponding increase in fillet leg le
44、ngth up to a maximum of 6 mm. For single pass-fillets, the root gap shall be limited to 3 mm and the weid leg length shall be compensated for by the same amount. 13 Previous page is blank - STD.EENUA PUB NO 177-ENGL 1777 = 57bb734 00012LO 282 Where butt welds are to be made between members of differ
45、ent thicknesses, a transition using a taper of 1:4 shall be provided. This taper may be wholly or partially within the width of the weld, but where possible the thicker member should be tapered. Fit-up using clamps or other fabrication aids may be used where appropriate. When tack welds are necessar
46、y they shall be at least 50 mm long and shall consist of at least two passes of sufficient cross sectional area to resist restraint cracking. The preheat shall not be less than for welding the joint. For single-sided welds, mild steel bars temporarily welded to the fusion face of the bevel so that t
47、he root pass can be deposited with minimum interference is the preferred method of tacking. Tack welds which are to form part of the completed joint are permitted for double-sided welds provided they are feathered at both ends. When agreed with the Purchaser, root tacks which are to remain in the jo
48、int may be permitted in single-sided welds if the ends are feathered. 5.2.6 Rat-holes, Penetrations and Cut-outs Rat-holes shall not be allowed in any item where the result might be water ingress to closed voids nor in padeye attachment points. Rat-holes at other locations should be avoided, but are
49、 permitted at the designers discretion to facilitate fabrication. All rat-holes may be left open unless advised otherwise by the Purchaser. 5.3 Control of Production Welding 5.3.1 Welding Environment All welding shall be carried out in conditions which permit satisfactory welding and adequate inspection. Whenever possible welds should be made in fabrication shops, with outdoor welding being restricted to final erection or to sub-assemblies which are too large or heavy to be welded elsewhere. Outdoor welding shall be protected from the effects of adverse w
