ABS-108-NOTICE-1-2004.pdf
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1、 ABS GUIDE FOR BUILDING AND CLASSING MEMBRANE TANK LNG VESSELS . 2002 1 GUIDE FOR BUILDING AND CLASSING MEMBRANE TANK LNG VESSELS OCTOBER 2002 NOTICE NO. 1 23 August 2004 SECTION 2 DESIGN CONSIDERATIONS AND GENERAL REQUIREMENTS (Reduce the NDCV in pipe duct space except for the same in way of the ta
2、nk boundary. Revise Section 2, Figure 1 accordingly:) FIGURE 1 Nominal Design Corrosion Values (23 August 2004) Trunk Deck Plate: 1.5 mm in Void Space Deck Transverse and Deck Girder: 1.0 mm in Void Space Upper Deck Plate: Watertight: 2.0 mm Weathertight: 1.5 mm Nontight: 1.5 mm Transverse Bulkhead
3、Plate (Wing): 1.5 mm in Ballast Tank 1.0 mm within Void Spaces Side Stringer: in Tank: WT: 2.0 mm NT: 1.5 mm in Void Space: WT: 1.5 mm NT: 1.0 mm Longitudinals and Stiffeners: in Tank: Vertical Element: 1.0 mm (2.0 mm for Splash Zone* and within Double Bottom) Non Vertical Element: 2.0 mm in Pipe Du
4、ct Space: All Elements: 1.0 mm in Void Space outside Double Bottom: All Elements: 1.0 mm Side Transverse: 1.5 mm in Tank (2.0 mm for Splash Zone) 1.0 mm in Void Space Side Shell Plate: 1.5 mm Bottom Shell Plate: 1.0 mm Floor, Girders and Transverses: 2.0 mm in Tank 1.5 mm in Pipe Duct or Void Space
5、including watertight bottom girder as duct keel tank boundary Webs on Cargo Transverse Bulkhead: where a space between trans. bulkheads is ballast tank: Vertical Web: 1.5 mm (2.0 mm for Splash Zone) Horizontal Web: 2.0 mm where a space between trans. bulkheads is void space: Vertical Web: 1.0 mm Hor
6、izontal Web: 1.5 mm Inner Bottom Plate: 1.0 mm (2.0 mm for Tank Top)* Transverse Bulkhead Plate: 1.0 mm in Cargo Tank Inner Deck Plate: 1.0 mm Inner Skin Bulkhead Plate: 1.0 mm *Splash Zone is 1.5 m below Tank Top. *Tank Top is considered in case double bottom has the separate ballast tank with outb
7、oard watertight double bottom girders. Copyright American Bureau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 20:45:24 MDTNo reproduction or networking permitted without license from IHS -,-,- Notice No. 1 23 August 2004 2 ABS GUIDE FOR
8、BUILDING AND CLASSING MEMBRANE TANK LNG VESSELS . 2002 (Add new Note 9 and revise the entries “Longitudinals and Stiffeners” and “Longitudinals and Stiffeners within Pipe Duct Space in Section 2, Table 1 as follows:) TABLE 1 Nominal Design Corrosion Values (1) (2) (23 August 2004) Nominal Design Cor
9、rosion Values in mm (in.) Structural Element/Location in Tank in Void Space Trunk Deck Plating N.A. 1.0 (0.04) Watertight 2.0 (0.08) Upper Deck Plating Weathertight 1.5 (0.06) Nontight 1.5 (0.06) Inner Deck Plating 1.0 (0.04) Side Shell Plating 1.5 (0.06) Bottom Plating 1.0 (0.04) Inner Bottom Plati
10、ng 1.0 (0.04) (3) 1.0 (0.04) Longitudinal Bulkhead Plating 1.0 (0.04) Transverse Bulkhead Plating in Wing Spaces 1.5 (0.06) 1.0 (0.04) (8) in Cargo Tanks 1.0 (0.04) Deck Transverse and Deck Girder N.A. 1.0 (0.04) (8) Double Bottom Floor and Girder (9) 2.0 (0.08) 1.5 (0.06) (8) Side Transverse 1.5 (0
11、.06) (4) 1.0 (0.04) Side Stringer Watertight 2.0 (0.08) 1.5 (0.06) (8) Nontight 1.5 (0.06) 1.0 (0.04) Webs on Cargo Transverse Bulkhead Vertical Web 1.5 (0.06) (4) 1.0 (0.04) (8) Horizontal Web 2.0 (0.08) 1.5 (0.06) (8) Longitudinals and Stiffeners Vertical Element (5) 1.0 (0.06) (7) 1.0 (0.04) Non
12、Vertical Element (6) 2.0 (0.08) 1.0 (0.04) Longitudinals and Stiffeners within Pipe Duct Space N.A. 1.0 (0.04) Longitudinals and Stiffeners in Void Spaces outside Double Bottom N.A. 1.0 (0.04) Notes 1 It is recognized that corrosion depends on many factors including coating properties, cargo composi
13、tion and temperature of carriage, and that actual wastage rates observed may be appreciably different from those given here. 2 Pitting and grooving are regarded as localized phenomena and are not covered in this table. 3 2.0 mm (0.08 in.) for tank top. 4 2.0 mm (0.08 in.) for Splash Zone (1.5 meters
14、 down from tank top). 5 Vertical elements are defined as elements sloped at an angle greater than 25 to the horizontal line. 6 Non vertical elements are defined as elements sloped at an angle less than 25 to the horizontal line. 7 2.0 mm (0.08 in.) for Splash Zone and within double bottom. 8 When pl
15、ating forms a boundary between a tank and a void space, the plating NDCV is determined by the tank type. 9 (23 August 2004) 1.5 mm (0.06 in.) for duct keel tank boundary girder. Copyright American Bureau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale,
16、 08/07/2008 20:45:24 MDTNo reproduction or networking permitted without license from IHS -,-,- Notice No. 1 23 August 2004 ABS GUIDE FOR BUILDING AND CLASSING MEMBRANE TANK LNG VESSELS . 2002 3 SECTION 3 LOAD CRITERIA 11 Sloshing Loads 11.5 Sloshing Pressures 11.5.1 Nominal Sloshing Pressure (23 Aug
17、ust 2004) (Equations for “htb” and “htub” to read as follows:) htb = 0.0055bCtb (es + 35) (es)1/2cos2u m (ft) htub = 0.007 tb Cb (es + 35) (es)1/2 sin2u m (ft) 11.5.2 Additional Nominal Sloshing Pressure for Low-Filling Resonance (23 August 2004) (Revise first paragraph as follows:) When the natural
18、 periods at the filling level higher than 1.13hd or 0.17h, whichever is less, and at filling level lower than 0.2l or 0.2b, whichever is higher, are at least 20% greater or smaller than that of the relevant ships motion, the nominal sloshing pressure for low-filling resonance, pi, should be used for
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