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关于执行船体结构钢板厚度公差新要求的通知
发布日期:2013/3/13 11:39:55   编辑:中厚板www.zhonghouban.cn   浏览次数:8904
国际船级社协会(IACS)已完成对统一要求UR W13钢板和宽扁钢厚度公差(W13 Thickness tolerances of steel plates and wide fl
     国际船级社协会(IACS)已完成对统一要求UR W13“钢板和宽扁钢厚度公差”(W13 Thickness tolerances of steel plates and wide flats)的修改,并将于2011 年1 月1 日起生效。最新版统一要求W13(2009年10 月版),
     新统一要求 UR W13“钢板和宽扁钢厚度公差”对船体结构用钢板的厚度公差要求进行了修改,该统一要求适用于:2011 年1 月1
日起及以后签订建造合同的船舶和2011 年1 月1 日起及以后进行检验和发证的船体结构用钢板。
     新统一要求 UR W13 与原统一要求主要变化有:
     1、船体结构用钢板的厚度负偏差仍为-0.3mm(见附件W13.3.2条),但引入了平均厚度的概念,并规定钢板测量的平均厚度不得小于钢板名义厚度(见附件W13.4.2 条)。正偏差按照相关国家标准执行;
     2、规定了对钢板厚度的测量方法(见附件W13.5 及W13 附录),CCS Circ. PD No. Page 2/1对钢板厚度的测量可以采用自动或手工的测量方法,测量位置为:附件图示(Figure A.1)至少选两条线进行厚度测量,每条线至少选三个测量点。按照规定的测量方法计算钢板的平均厚度;
      3、若钢厂按正偏差控制轧制船体结构钢板,则不必按照上述2条的规定进行厚度测量和计算钢板的平均厚度。具体要求,请详见附件。
      中国船级社(CCS)将从2011 年1 月1 日起对申请检验的船体结构用钢板执行新统一要求。
      请各钢厂、各船厂及有关单位注意到统一要求 UR W13 的变化,并做出相应调整。
      本通函在实施过程中如有任何疑问,请与总部建造入级处联系。
本通函在实施过程中如有任何疑问,请与总部建造入级处联系。
    电话:010-58113457;            
传真:010-58112897;            
电子邮箱:jzhao@ccs.org.cn;
联系人:赵 捷


Notice on Implementation of IACS UR W13 Thickness tolerance of  
steel plates and wide flats

     International Association of Classification Societies (IACS) has modified the UnifiedRequirements(UR) W13 “Thickness tolerances of steel plates and wide flats”, and itwill become effective on 1st January 2011. The newest UR W13 (Rev. 4 Oct. 2009)please see attached document.           
     The requirements of minus tolerance of hull structural steel plates was revised in thenewest version UR W13 (Rev. 4 Oct. 2009), which is to be applied to ships contractedfor construction on or after 1st January 2011 and when the application for certificationof hull structural steel plates is dated on or after 1st January 2011.   
      The main revisions are as follows,
     1. minus tolerance of hull structural steel plates is still -0.3mm(see attached documentW13.3.2), but average thickness of plates must be measured and the measured resultis not less than the nominal thickness(see attached document W13.4.2). The plus
tolerances on nominal thickness are to be accordance with a recognized nationalstandard.
     2. Thickness measurements see W13.5 and ANNEX of W13.
     3. When plus tolerance control used for all hull structural steel plates, the above 2mentioned stipulations in Para 2 and average thickness measurement may not berequired.
     ChinaChina Classification Society will implement the UR W13(Rev. 4 Oct. 2009) on 1st
January 2011 for survey of hull structural steel plates.
     All steel manufacturers, shipyards should be aware of the changes in UR W13, andadjust measuring method properly for the implementation of new UR W13.
If any questions raised, please feel free to contact the New Building Dept. of CCSHeadquarters.

 
Person in charged, Zhao Jie,
E-mail:jzhao@ccs.org.cn,     
Tel:010-58112457,               
Fax:010-58112897,              

 
Thickness tolerances of steel plates and wideflats
W13.1 Scope
      W13.1.1 These requirements apply to the tolerance on thickness of steel plates and wideflats (hereinafter referred to as: product or products) with thicknesses of 5 mm and over,covering the following steel grades:
     (i) Normal and higher strength hull structural steels according to W11
     (ii) High strength quenched and tempered steels for welded structure according to UR W16
     (iii) Steels for machinery structures in accordance with the individual Rules of ClassificationSocieties
     The thickness tolerances for products below 5 mm may be specially agreed.
     W13.1.2 These requirements do not apply to products intended for the construction of
boilers, pressure vessels and independent tanks, e.g. for the transportation of liquefied gases
or chemicals.
     NOTE:
     Tolerances for length, width, flatness and over thickness may be taken from national orinternational standards.
      W13.1.3 Where Class C of ISO 7452 is applied in lieu of W13.3, the requirements in W13.4and W13.5 may not be applied.
      W13.2 Responsibility
     W13.2.1 The responsibility for verification and maintenance of the production within the
required tolerances rests with the manufacturer. The Surveyor may require to witness some
measurements.
     W13.2.2 The responsibility for storage and maintenance of the delivered product(s) with
acceptable level of surface conditions rests with the shipyard before the products are used in
fabrication.
     Note:
     1. Rev.4 of this UR is to be uniformly implemented by IACS Societies on ships
contracted for construction on or after 1 January 2011 and when the application for
certification of steel plates is dated on or after 1 January 2011.
     2. The “contracted for construction” date means the date on which the contract to build
the vessel is signed between the prospective owner and the shipbuilder. For further
details regarding the date of “contract for construction”, refer to IACS Procedural
Requirement (PR)No. 29.
     W13.3 Thickness tolerances
     W13.3.1 The tolerances on thickness of a given product are defined as:
- Minus tolerance is the lower limit of the acceptable range below the nominal thickness.
- Plus tolerance is the upper limit of the acceptable range above the nominal thickness.
     NOTE:
      Nominal thickness is defined by the purchaser at the time of enquiry and order.
     W13.3.2 The minus tolerance on thickness of products in accordance with UR W11 and UR
     W16 is 0.3 mm irrespective of nominal thickness.
     W13.3.3 The minus tolerances for products for machinery structures are to be in accordancewith Table 1.
     Table 1
     Nominal thickness (t) (mm) Tolerance (mm)
     5 ≤ t < 8 -0.4
     8 ≤ t < 15 -0.5
     15 ≤ t < 25 -0.6
     25 ≤ t < 40 -0.8
     t ≥ 40 -1.0
     W13.3.4 The tolerances on nominal thickness are not applicable to areas repaired bygrinding which are to be in accordance with a recognized standard. The IACSrecommendation No.12 may be used for this purpose.
     W13.3.5 The plus tolerances on nominal thickness are to be in accordance with a
recognized national or international standard.
     W13.4 Average thickness
     W13.4.1 The average thickness of a product or products is defined as the arithmetic meanof the measurements made in accordance with the requirements of W13.5.
     W13.4.2 The average thickness of a product or products in accordance with URs W11 or
     W16 is not to be less than the nominal thickness.
     W13.5 Thickness measurements
     W13.5.1 The thickness is to be measured at locations of a product or products as defined inAnnex.
     W13.5.2 Automated method or manual method is applied to the thickness measurements.
     W13.5.3 The procedure and the records of measurements are to be made available to theSurveyor and copies provided on request.
     ANNEX: Thickness Measuring Locations
     A.1 Scope of application
     This Annex applies to the thickness measuring locations for the thickness tolerance and theaverage thickness of the product.
     A.2 Measuring locations
     At least two lines among Line 1, Line 2 or Line 3 as shown in Figure A.1, are to be selectedfor the thickness measurements and at least three points on each selected line as shown inFigure A.1 are to be selected for thickness measurement. If more than three points are takenon each line the number of points shall be equal on each line.
     For automated methods, the measuring points at sides are to be located not less than 10 mmbut not greater than 300 mm from the transverse or longitudinal edges of the product.
     For manual methods, the measuring points at sides are to be located not less than 10 mm butnot greater than 100 mm from the transverse or longitudinal edges of the product.

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