ࡱ> @ _jbjbqq ,Q1.l,,,4hLL8Lx : p" " " . }KKKKKKK,M PK,###KC " " x C C C #" l" }KC `"#}KC < C )9^6,:l N# ::8L8L:<PC P:C Part B Repair Quality Standard for Existing Ships Part B - Shipbuilding and Repair Quality Standard for Existing Ships CONTENTS: 1. Scope 2. General requirements to repairs and repairers 3. Qualification of personnel 3.1 Qualification of welders 3.2 Qualification of welding procedures 3.3 Qualification of NDE operators 4. Materials 4.1 General requirements to materials 4.2 Equivalency of material grades 5. General requirements to welding 5.1 Correlation of welding consumables to hull structural steels 5.2 General requirements to preheating and drying out 5.3 Dry welding on hull plating below the waterline of vessels afloat 6. Repair quality standard 6.1 Welding, general 6.2 Renewal of plates 6.3 Doubler on plates 6.4 Renewal of internals/stiffeners 6.5 Renewal of internals/stiffeners - transitions inverted angles/bulb profiles 6.6 Application of Doubling Straps 6.7 Welding of pitting corrosion 6.8 Welding repairs of cracks REFERENCES 1. IACS Bulk Carriers - Guidelines for Surveys, Assessment and Repair of Hull Structure 2. TSCF Guidelines for the inspection and maintenance of double hull tanker structures 3. TSCF Guidance manual for the inspection and condition assessment of tanker structures 4. IACS UR W 11 Normal and higher strength hull structural steels 5. IACS UR W 13 Thickness tolerances of steel plates and wide flats 6. IACS UR W 17 Approval of consumables for welding normal and higher strength hull structural steels 7. IACS Z 10.1 Hull surveys of oil tankers and Z 10.2 Hull surveys of bulk carriers Table IV 8. IACS UR Z 13 Voyage repairs and maintenance 9. IACS Recommendation 12 Guidelines for surface finish of hot rolled steel plates and wide flats 10. IACS Recommendation 20 Non-destructive testing of ship hull steel welds 1. Scope 1.1 This standard provides guidance on quality of repair of hull structures. The standard covers permanent repairs of existing ships. Whereas the standard generally applies to - conventional ship types, - parts of hull covered by the rules of the Classification Society, - hull structures constructed from normal and higher strength hull structural steel, the applicability of the standard is in each case to be agreed upon by the Classification Society. The standard does generally not apply to repair of - special types of ships as e.g. gas tankers - structures fabricated from stainless steel or other, special types or grades of steel 1.2 The standard covers typical repair methods and gives guidance on quality standard on the most important aspects of such repairs. Unless explicitly stated elsewhere in the standard, the level of workmanship reflected herein will in principle be acceptable for primary and secondary structure of conventional design. A more stringent standard may however be required for critical and highly stressed areas of the hull, and is to be agreed with the Classification Society in each case. In assessing the criticality of hull structure and structural components, reference is made to ref. 1, 2 and 3. 1.3 Restoration of structure to the original standard may not constitute durable repairs of damages originating from insufficient strength or inadequate detail design. In such cases strengthening or improvements beyond the original design may be required. Such improvements are not covered by this standard, however it is referred to ref. 1, 2 and 3. 2. General requirements for repairs and repairers 2.1 In general, when hull structure covered by classification is to be subjected to repairs, the work is to be carried out under the supervision of the Surveyor to the Classification Society. Such repairs are to be agreed prior to commencement of the work. 2.2 Repairs are to be carried out by workshops, repair yards or personnel who have demonstrated their capability to carry out hull repairs of adequate quality in accordance with the Classification Societys requirements and this standard. 2.3 Repairs are to be carried out under working conditions that facilitate sound repairs. Provisions are to be made for proper accessibility, staging, lighting and ventilation. Welding operations are to be carried out under shelter from rain, snow and wind. 2.4 Welding of hull structures is to be carried out by qualified welders, according to approved and qualified welding procedures and with welding consumables approved by the Classification Society, see Section 3. Welding operations are to be carried out under proper supervision of the repair yard. 2.5 Where repairs to hull which affect or may affect classification are intended to be carried out during a voyage, complete repair procedure including the extent and sequence of repair is to be submitted to and agreed upon by the Surveyor to the Classification Society reasonably in advance of the repairs. See Ref. 8. 3. Qualification of personnel 3.1 Qualification of welders 3.1.1 Welders are to be qualified in accordance with the procedures of the Classification Society or to a recognised national or international standard, e.g. EN 287, ISO 9606, ASME Section IX, ANSI/AWS D1.1. Recognition of other standards is subject to submission to the Classification Society for evaluation. Repair yards and workshops are to keep records of welders qualification and, when required, furnish valid approval test certificates. 3.1.2 Welding operators using fully mechanised of fully automatic processes need generally not pass approval testing, provided that production welds made by the operators are of the required quality. However, operators are to receive adequate training in setting or programming and operating the equipment. Records of training and production test results shall be maintained on individual operators files and records, and be made available to the Classification Society for inspection when requested. 3.2 Qualification of welding procedures Welding procedures are to be qualified in accordance with the procedures of the Classification Society or a recognised national or international standard, e.g. EN288, ISO 9956, ASME Section IX, ANSI/AWS D1.1. Recognition of other standards is subject to submission to the Classification Society for evaluation. The welding procedure should be supported by a welding procedure qualification record. The specification is to include the welding process, types of electrodes, weld shape, edge preparation, welding techniques and positions. 3.3 Qualification of NDE operators 3.3.1 Personnel performing non destructive examination for the purpose of assessing quality of welds in connection with repairs covered by this standard, are to be qualified in accordance with the Classification Society rules or to a recognised international or national qualification scheme. Records of operators and their current certificates are to be kept and made available to the Surveyor for inspection. 4. Materials 4.1 General requirements for materials 4.1.1 The requirements for materials used in repairs are in general the same as the requirements for materials specified in the Classification Societys rules for new constructions, (ref. 5). 4.1.2 Replacement material is in general to be of the same grade as the original approved material. Alternatively, material grades complying with recognised national or international standards may be accepted by the Classification Societies provided such standards give equivalence to the requirements of the original grade or are agreed by the Classification Society. For assessment of equivalency between steel grades, the general requirements and guidelines in Section 4.2 apply. 4.1.3 Higher tensile steel is not to be replaced by steel of a lesser strength unless specially approved by the Classification Society. 4.1.4 Normal and higher strength hull structural steels are to be manufactured at works approved by the Classification Society for the type and grade being supplied. 4.1.5 Materials used in repairs are to be certified by the Classification Society applying the procedures and requirements in the rules for new constructions. In special cases, and normally limited to small quantities, materials may be accepted on the basis of alternative procedures for verification of the materials properties. Such procedures are subject to agreement by the Classification Society in each separate case. 4.2 Equivalency of material grades 4.2.1 Assessment of equivalency between material grades should at least include the following aspects; - heat treatment/delivery condition - chemical composition - mechanical properties - tolerances 4.2.2 When assessing the equivalence between grades of normal or higher strength hull structural steels up to and including grade E40 in thickness limited to 50 mm, the general requirements in Table 4.1 apply. 4.2.3 Guidance on selection of steel grades to certain recognised standards equivalent to hull structural steel grades specified in Classification Societies rules is given in Table 4.2 Items to be consideredRequirementsCommentsChemical composition- - - - -C; equal or lower P and S; equal or lower Mn; approximately the same but not exceeding 1.6% Fine grain elements; in same amount Detoxidation practiceThe sum of the elements, e.g. Cu, Ni, Cr and Mo should not exceed 0.8%Mechanical properties- - -Tensile strength; equal or higher Yield strength; equal or higher Elongation; equal or higher Impact energy; equal or higher at same or lower temperature, where applicableActual yield strength should not exceed Classification Society Rule minimum requirements by more than 80 N/mm2 Condition of supplySame or betterHeat treatment in increasing order;- - - - - 1) as rolled (AR) controlled rolled (CR) normalised (N) thermo-mechanically rolled (TM)1) quenched and tempered (QT)1) TM- and QT-steels are not suitable for hot formingTolerances-Same or stricterPermissable under thickness tolerances;- - plates: 0.3 mm sections: according to recognised standards Table 4.1 Minimum extent and requirements to assessment of equivalency between normal or higher strength hull structual steel grades Steel grades according to Classification Societies rules (ref. 5) Comparable steel gradesGradeYield stress ReH min. N/mm2Tensile strength Rm N/mm2Elongation A5 min. %Average impact energyISO 630-80 4950/2/3/ 1981EN EN 10025-93 EN 10113-93ASTM A 131JIS G 3106Temp. OCJ, min.LTA B D E  235 400-502  22+20 0 -20 -40- 27 27 27- 20 20 20Fe 360B Fe 360C Fe 360D -S235JRG2 S235J0 S235J2G3 S275NL/MLA B D ESM41B SM41B (SM41C) -A 27 D 27 E 27 265 400-530 220 -20 -40 27 20Fe 430C Fe 430D -S275J0G3 S275N/M S275NL/ML- - -- - -A 32 D 32 E 32 315 440-590 220 -20 -40 31 22- - -- - -AH32 DH32 EH32SM50B (SM50C) -A 36 D 36 E 36 355 490-620 210 -20 -40 34 24Fe 510C Fe 510D E355ES355N/M S355N/M S355NL/MLAH36 DH36 EH36SM53B (SM53C) -A 40 D 40 E 40 390 510-650 200 -20 -40 41 27E390CC E390DD E390ES420N/M S420N/M S420NL/MLAH40 DH40 EH40(SM58) - - Note: In selecting comparitable steels from this table, attention should be given to the requirements of Table 4.1 and the dimension requirements of the product with respect to Classification Sociey rules. Table 4.2 Guidance on steel grades comparable to the normal and high strength hull structural steel grades given in Classification Society rules 5. General requirements to welding 5.1 Correlation of welding consumables with hull structural steels 5.1.1 For the different hull structural steel grades welding consumables are to be selected in accordance with IACS UR W17 (see Ref.6). 5.2 General requirements to preheating and drying out 5.2.1 The need for preheating is to be determined based on the chemical composition of the materials, welding process and procedure and degree of joint restraint. 5.2.2 A minimum preheat of 50o C is to be applied when ambient temperature is below 0 C. Dryness of the welding zone is in all cases to be ensured. 5.2.3 Guidance on recommended minimum preheating temperature for higher strength steel is given in Table 5.1. For automatic welding processes utilising higher heat input e.g. submerged arc welding, the temperatures may be reduced by 50o C. For re-welding or repair of welds, the stipulated values are to be increased by 25o C. Carbon equivalent 1)Recommended minimum preheat temperature (O C) tcomb d" 50 mm 2) 50 mm < tcomb d" 70 mm 2)tcomb > 70 mm 2)Ceq d" 0.39 --50Ceq d" 0.41 --75Ceq d" 0.43 -50100Ceq d" 0.45 50100125Ceq d" 0.47 100125150Ceq d" 0.50 125150175 Table 5.1 Preheating temperature 5.3 Dry welding on hull plating below the waterline of vessels afloat 5.3.1 Welding on hull plating below the waterline of vessels afloat is acceptable only on normal and higher strength steels with specified yield strength not exceeding 355 MPa and only for local repairs. Welding involving other high strength steels or more extensive repairs against water backing is subject to special consideration and approval by the Classification Society of the welding procedure. 5.3.2 Low-hydrogen electrodes or welding processes are to be used when welding on hull plating against water backing. Coated low-hydrogen electrodes used for manual metal arc welding should be properly conditioned to ensure a minimum of moisture content. 5.3.3 In order to ensure dryness and to reduce the cooling rate, the structure is to be preheated by a torch or similar prior to welding, to a temperature of minimum 5o C or as specified in the welding procedure. Notes: 1)  EMBED Equation.3  2) Combined thickness tcomb = t1+t2+t3+t4, see figure  6. Repair quality standard 6.1 Welding, general  Fig 6.1 Groove roughness ItemStandardLimitRemarks Material GradeSame as original or higherSee Section 4Welding Consumables IACS UR W17 (ref. 6) Approval according to equivalent international standardGroove / RoughnessSee note and Fig 6.1d < 1.5 mmGrind smoothPre-HeatingSee Table 5.1Steel temperature not lower than 5oCWelding with water on the outsideSee Section 5.3Acceptable for normal and high strength steels-Moisture to be removed by a heating torchAlignmentAs for new constructionWeld FinishIACS Recommendation 20 (ref. 10)NDEIACS Recommendation 20 (ref. 10)At random with extent to be agreed with attending surveyors Note: Slag, grease, loose mill scale, rust and paint, other than primer, to be removed. 6.2 Renewal of plates  Fig 6.2 Welding sequence for inserts ItemStandardLimitRemarks Size InsertMin. 300 x 300 mm R = 5 x thickness Circular inserts: Dmin = 200 mmMin. 200 x 200 mm Min R = 100 mm Marterial Grade Same as original or higher See Section 4.Edge PreparationAs for new constructionIn case of non compliance increase the amount of NDEWelding SequenceSee Fig 6.2 Weld sequence is 1 2 3 4For primary members sequence 1 and 2 transverse to the main stress directionAlignmentAs for new constructionWeld FinishIACS Recommendation 20 (ref. 10)NDEIACS Recommendation 20 (ref. 10) 6.3 Doublers on plating Local doublers are normally only allowed as temporary repairs, except as original compensation for openings, within the main hull structure.  Fig 6.3 Doublers on plates ItemStandardLimitRemarksExisting PlatingGeneral: t e" 5 mmFor areas where existing plating is less than 5 mm plating a permanent repair by insert is to be carried out.Extent / Size Rounded off corners.min 300 x 300 mm R e" 50 mmThickness of Doubler (td)td d" tp (tp = original thickness of existing plating)td > tp/3Material GradeSame as original plateSee Section 4 Edge PreparationAs for [newbuidling] new constructionDoublers welded on primary strength members: (Le: leg length) when t > Le + 5 mm, the edge to be tapered (1:4)WeldingAs for [newbuidling] new constructionWelding sequence similar to insert plates.Weld Size (throat thicknesss)Circumferencial and in slots: 0.6 x tdSlot WeldingNormal size of slot: (80-100) x 2 td Distance from doubler edge and between slots: d d" 15 tdMax pitch between slots 200 mm dmax = 500 mmFor doubler extended over several supporting elements, see Figure 6.3NDEIACS Recommendation 20 (ref. 10) 6.4 Renewal of internals/stiffeners  Fig 6.4 Welding sequence for inserts of stiffeners ItemStandardLimitRemarks Size InsertMin. 300 mmMin. 200 mm Marterial Grade Same as original or higher See Section 4.Edge PreparationAs for new construction. Fillet weld stiffener web / plate to be released over min. d = 150 mmWelding SequenceSee Fig 6.4 Welding sequence is 1 2 3 AlignmentAs for new constructionWeld FinishIACS Recommendation 20 (ref. 10)NDEIACS Recommendation 20 (ref. 10) 6.5 Renewal of internals/stiffeners transitions inverted angle/bulb profile The application of the transition is allowed for secondary structural elements.  Fig 6.5 Transition between inverted angle and bulb profile ItemStandardLimitRemarks (h1- h2)d" 025 x b1  EMBED Equation.3 2 mm Without tapering transition.Transition Angle15 degrees At any arbitrary sectionFlanges tf = tf2 bf = bf2Length of Flatbar 4 x h1MaterialSee Section 4. 6.6 Application of Doubling Straps In certain instances, doubling straps are used as a means to strengthen and reinforce primary structure. Where this has been agreed and approved, particular attention should be paid to: - the end termination points of the straps, so that toe support is such that no isolated hard point occurs. - in the case of application of symmetrical or asymmetrical-ended straps, the corners at the end of the tapering should be properly rounded. - any butts between lengths of doubling straps, so that there is adequate separation of the butt weld from the primary structure below during welding, and so that a high quality root run under controlled circumstances is completed prior to completing the remainder of the weld. Ultrasonic testing should be carried out on completion to verify full penetration.   Fig 6.6 Application of Doubling Straps ItemStandardLimitRemarks Taperingl/b>3 Special consideration to be drawn to design of strap terminations in fatigue sensitive areas.Radius0.1 x bmin 30 mmMaterialSee paragraph 2.0 General requirement to materials.Weld SizeDepending on number and function of straps. Throat thickness to be increased 15 % toward ends.WeldingWelding sequence from middle towards the free endsSee sketch. For welding of lengths > 1000 mm step welding to be applied. 6.7 Welding of pitting corrosion Notes: Shallow pits may be filled by applying coating or pit filler. Pits can be defined as shallow when their depth is less that 1/3 of the original plate thickness.  Fig 6.7 Welding of pits ItemStandardLimitRemarks Extent / DepthPits / grooves are to be welded flush with the original surface. If deep pits or grooves are clustered together or remaining thickness is less than 6 mm, the plates should be renewed.See also IACS Recommendation 12 (ref. 9)CleaningHeavy rust to be removedPre-HeatingSee Table 5.1Required when ambient temperature < 5oCAlways use propane torch or similar to remove any moistureWelding SequenceReverse direction for each layerSee also IACS Recommendation 12 (ref. 9)Weld FinishIACS Recommendation 20 (ref. 10)NDEIACS Recommendation 20 (ref. 10)Min. 10% extentPreferably MPI Reference is made to TSCF Guidelines, Ref. 2 & 3. 6.8 Welding repairs for cracks In the event that a crack is considered weldable, either as a temporary or permanent repair, the following techniques should be adopted as far as practicable. Run-on and run-off plates should be adopted at all free edges.  Fig 6.8.a Step back technique  Fig 6.8.b End crack termination  Fig 6.8.c Welding sequence for cracks with length less than 300 mm  Fig 6.8.d Groove preparation (U-groove left and V-groove right) ItemStandardLimitRemarks Groove Preparation EMBED Equation.3 = 45-60o r = 5 mmFor through plate cracks as for newbuilding. Also see Fig 6.8.dTerminationTermination to have slope 1:3For cracks ending on edges weld to be terminated on a tab see Fig 6.8.bExtentOn plate max. 400 mm length. Vee out 50 mm past end of crackOn plate max 500 mm. Linear crack, not branchedWelding SequenceSee Fig 6.8.c for sequence and directionFor cracks longer than 300 mm step-back technique should be used Fig 6.8.aAlways use low hydrogen welding consumablesWeld FinishIACS Recommendation 20 (ref. 10)NDEIACS Recommendation 20 (ref. 10)100 % MP or PE of groove100 % surface crack detection + UE or RE for butt joints       No.47  Page  PAGE 7 of  NUMPAGES 19 IACS Rec. 1996/Rev.7 2013  No.47  Page  PAGE 8 of  NUMPAGES 19 IACS Rec. 1996/Rev.7 2013  No.47  Page  PAGE 19 of  NUMPAGES 19 IACS Rec. 1996/Rev.7 2013 No. 47 End of Part B, End of Document No. 47 (cont) No. 47 (cont) No. 47 (cont) 467|}LYy z  T%&? !&&&'))>)))<*=*Y*Z*s+t+u+ƾƶաCJH*OJQJmHOJPJQJmH 57CJOJQJ>*CJOJQJ CJOJQJ5CJOJQJCJOJQJmH5CJOJQJmH5CJ(OJQJmHjCJ(OJQJUmH? 456|}(KLYZ  7  !n YZG^H^I^___ ? 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