ABS 169 NOTICE 5-2014 GUIDE FOR BUILDING AND CLASSING FLOATING OFFSHORE LIQUEFIED GAS TERMINALS.pdf

1、 ABSGUIDE FOR BUILDING AND CLASSING FLOATING OFFSHORE LIQUEFIED GAS TERMINALS .2010 1 GUIDE FOR BUILDING AND CLASSING FLOATING OFFSHORE LIQUEFIED GAS TERMINALS JUNE 2010 NOTICE NO. 5 June 2014 The following Rule Changes were approved by the ABS Rules Committee on 30 May 2014 and become EFFECTIVE AS

2、OF 1 JUNE 2014. (See http:/www.eagle.org for the consolidated version of the Guide for Building and Classing Floating Offshore Liquefied Gas Terminals, 2010, with all Notices and Corrigenda incorporated.) Notes - The date in the parentheses means the date that the Rule becomes effective for new cons

3、truction based on the contract date for construction. (See 1-1-4/3.3 of the ABS Rules for Conditions of Classification Offshore Units and Structures (Part 1).) FOREWORD (1 June 2014) (Add new fourth paragraph, as follows.) In June 2014, the definitions of permissible bending stress in Chapter 3, Sec

4、tions 4 and 6 were revised to cover the strength evaluation of longitudinal members beyond 0.4L amidships. CHAPTER 3 STRUCTURAL DESIGN REQUIREMENTS SECTION 4 INITIAL SCANTLING CRITERIA 3 Hull Girder Strength 3.5 Hull Girder Section Modulus 3.5.1 Section Modulus (1 June 2014) (Revise definition of fp

5、, as follows.) fp= nominal permissible bending stress within 0.4L amidships = 17.5 kN/cm2(1.784 tf/cm2, 11.33 Ltf/in2) = nominal permissible bending stress forward of 0.9L from A.P. and aft of 0.1L from A.P. = 12.5 kN/cm2(1.274 tf/cm2, 8.09 Ltf/in2) Linear interpolation is to be used for the interme

6、diate location. Notice No. 5 June 2014 2 ABSGUIDE FOR BUILDING AND CLASSING FLOATING OFFSHORE LIQUEFIED GAS TERMINALS .2010 5 Shearing Strength (Revise Paragraph 3-4/5.9, as follows.) 5.9 Application of 3D FEM (1 June 2014) The distribution of the total shear stresses in the side shell and longitudi

7、nal bulkhead/inner skin bulkhead plating (net thickness) may be calculated using a 3D FEM structural analysis to check the shear strength for all the anticipated loading conditions. 7 Double Bottom Structures 7.3 Bottom Shell and Inner Bottom Plating 7.3.1 Bottom Shell Plating Net Thickness (1 June

8、2014) (Revise definition of f1and add new definition of fmax, as follows.) f1= permissible bending stress, in the longitudinal direction, in N/cm2 (kgf/cm2, lbf/in2) = (1 0.701SMRB/SMB)Smfy 0.40fmax= (1 0.701SMRB/SMB)Smfy (0.40 + 0.1(190 L)/40) Smfyfor L 190 m fmax= 0.40Smfywithin 0.4L amidships = 0

9、.55Smfypeak bulkhead to the end Linear interpolation is to be used for the intermediate location. (Revise definition of f2, as follows.) f2= permissible bending stress, in the transverse direction, in N/cm2(kgf/cm2, lbf/in2) = 0.80Smfy0.4L amidships = 1.00Smfypeak bulkhead to the end Linear interpol

10、ation is to be used for the intermediate location. 7.3.2 Inner Bottom Plating Net Thickness (1 June 2014) (Revise definition of f1and add new definition of fmax, as follows.) f1= permissible bending stress, in the longitudinal direction, in N/cm2(kgf/cm2, lbf/in2) = (1 0.521SMRB /SMB)Smfy fmax, wher

11、e SMB /SMRBis not to be taken more than 1.4 fmax= 0.57Smfy0.4L amidships = 0.65Smfypeak bulkhead to the end Linear interpolation is to be used for the intermediate location. Notice No. 5 June 2014 ABSGUIDE FOR BUILDING AND CLASSING FLOATING OFFSHORE LIQUEFIED GAS TERMINALS .2010 3 (Revise definition

12、 of f2, as follows.) f2= permissible bending stress, in the transverse direction, in N/cm2(kgf/cm2, lbf/in2) = 0.85Smfy0.4L amidships = 1.00Smfypeak bulkhead to the end Linear interpolation is to be used for the intermediate location. 7.5 Bottom, Bilge and Inner Bottom Longitudinals 7.5.1 Bottom Lon

13、gitudinals Net Section Modulus (1 June 2014) (Revise definition of fband add new definition of fmax, as follows.) fb= permissible bending stresses, in N/cm2(kgf/cm2, lbf/in2) = (1.0 0.651SMRB/SMB)Smfy fmaxfmax= 0.55Smfy0.4L amidships = 0.70Smfypeak bulkhead to the end Linear interpolation is to be u

14、sed for the intermediate location. 7.5.3 Inner Bottom Longitudinals Net Section Modulus (1 June 2014) (Revise definition of fb1and add new definition of fmax, as follows.) fb1= permissible bending stresses, in N/cm2(kgf/cm2, lbf/in2) = (1.0 0.501SMRB/SMB)Smfy fmaxfmax= 0.65Smfy0.4L amidships = 0.75S

15、mfypeak bulkhead to the end Linear interpolation is to be used for the intermediate location. 7.7 Double Bottom Girders and Floors 7.7.2 Double Bottom Centerline Girder Net Thickness (1 June 2014) (Revise equations for t1, as follows.) t1= (4.5DBL 10-2+ 4.5) mm within 0.75L amidships = 0.8(4.5DBL 10

16、-2+ 4.5) mm others but need not be greater than (4.5L 10-2+ 4.5)R mm = (5.4DBL 10-4+ 0.177) in. within 0.75L amidships = 0.8(5.4DBL 10-4+ 0.177) in. others but need not be greater than (5.4L 10-4+ 0.177)R in. Notice No. 5 June 2014 4 ABSGUIDE FOR BUILDING AND CLASSING FLOATING OFFSHORE LIQUEFIED GAS

17、 TERMINALS .2010 7.7.3 Double Bottom Side Girder Net Thickness (1 June 2014) (Revise equations for t1, as follows.) t1= (2.6DBL 10-2+ 4.5) mm within 0.75L amidships = 0.8(2.6DBL 10-2+ 4.5) mm others but need not be greater than (2.6L 10-2+ 4.5)R mm = (3.1DBL 10-4+ 0.177) in. within 0.75L amidships =

18、 0.8(3.1DBL 10-4+ 0.177) in. others but need not be greater than (3.1L 10-4+ 0.177)R in. t1is not to be less than the thickness given in 3-4/Table 1 7.7.4 Double Bottom Floors Net Thickness (1 June 2014) (Revise equations for t1, as follows.) t1= (2.6DBL 10-2+ 4.5) mm within 0.75L amidships = 0.8(2.

19、6DBL 10-2+ 4.5) mm others but need not be greater than (2.6L 10-2+ 4.5)R mm = (3.1DBL 10-4+ 0.177) in. within 0.75L amidships = 0.8(3.1DBL 10-4+ 0.177) in. others but need not be greater than (3.1L 10-4+ 0.177)R in. t1is not to be less than the thickness given in 3-4/Table 1 9 Side Shell and Deck 9.

20、1 Side Shell Plating (1 June 2014) (Revise definition of f1and add new definition of fmax, as follows.) f1= permissible bending stress in the longitudinal direction: = 0.86 0.501(SMRB/SMB)(y/yb)Smfy fmaxfor L 190 m (623 ft), below neutral axis 0.43 + 0.17(190 L)/40Smfy, for L 190 m (623 ft), below n

21、eutral axis SMB/SMRBis not to be taken more than 1.4. = fmaxfor L 190 m (623 ft), above neutral axis = 0.43 + 0.17 (190 L)/40Smfyfor L 190 m (623 ft), above neutral axis fmax= 0.43Smfy0.4L amidships = 0.65SmfyAft end to the aft peak bulkhead = 0.60SmfyFore peak bulkhead to the fore end Linear interp

22、olation is to be used for the intermediate location. Notice No. 5 June 2014 ABSGUIDE FOR BUILDING AND CLASSING FLOATING OFFSHORE LIQUEFIED GAS TERMINALS .2010 5 (Revise definition of f2, as follows.) f2= permissible bending stress, in the vertical direction, in N/cm2(kgf/cm2, lbf/in2) = 0.85Smfy0.4L

23、 amidships = 0.85SmfyFore peak bulkhead to the fore end = 1.00SmfyAft end to the aft peak bulkhead Linear interpolation is to be used for the intermediate location. 9.5 Deck Plating 9.5.1 Upper Deck Net Thickness (1 June 2014) (Revise definition of f2, as follows.) c = where the inner deck is not in

24、stalled: 0.4L amidships 0.5 (0.6 + 0.0015L) for SI or MKS Units 0.5 (0.6 + 0.00046L) for U.S. Units c is not to be taken less than (0.7N2 0.2) for installations having length less than 267 m (876 ft) = where the inner deck is installed: 0.4L amidships 0.7N 2 0.2, not to be less than 0.40Q1/2= 0.30Q1

25、/2Peak bulkhead to the end Linear interpolation is to be used for the intermediate location. 9.7 Deck and Side Longitudinals (1 June 2014) (Revise definition of fband add new definition of fmax, as follows.) fb= permissible bending stresses, in N/cm2(kgf/cm2, lbf/in2) = 1.0 0.822(SMRD/SMD)(y/yn)Smfy

26、 0.60Smfyfor upper deck longitudinal = 1.0 0.822(SMRD/SMD)(y/yn)Smfy 0.30Smfyfor inner deck longitudinal = 1.0 0.672(SMRD/SMD)(y/yn)Smfy 0.45Smfyfor second deck longitudinal = 1.00.86 0.521(SMRB/SMB)(y/yn) Smfy fmaxfor side longitudinals below neutral axis = 2.00.86 0.522(SMRD/SMD)(y/yn) Smfy fmaxfo

27、r side longitudinals above neutral axis fmax= 0.75Smfy0.4L amidships = 0.90Smfy Aft end to the aftpeak bulkhead = 0.85Smfy Forepeak bulkhead to the fore end Linear interpolation is to be used for the intermediate location. Notice No. 5 June 2014 6 ABSGUIDE FOR BUILDING AND CLASSING FLOATING OFFSHORE

28、 LIQUEFIED GAS TERMINALS .2010 CHAPTER 3 STRUCTURAL DESIGN REQUIREMENTS SECTION 6 HULL STRUCTURE BEYOND 0.4L AMIDSHIPS 1 General Requirements (Revise Paragraph 3-6/1.3, as follows.) 1.3 Structures within the Cargo Space Length (1 June 2014) The scantlings of longitudinal structural members and eleme

29、nts in way of cargo spaces beyond the 0.4L amidships may be gradually reduced toward the peak bulkhead, provided that the hull girder section modulus complies with 3-4/3.5 and that the strength of the structure satisfies 3-4/7 through 3-4/17 and the material yielding, buckling and ultimate strength

30、criteria specified in 3-5/3 and 3-5/5. The scantlings of main supporting members in way of the cargo space length beyond 0.4L amidships are to comply with the requirements of 3-4/11. Where the structural configuration is different from that amidships due to the hull form of the vessel, additional ev

31、aluation is to be performed. The structural evaluation using the actual configuration is to be carried out to verify that the arrangement of openings necessary for access, ventilation, fabrication, etc. is satisfactory. 3 Forebody Side Shell Structure 3.1 Side Shell Plating (1 June 2014) (Revise Sub

32、paragraph 3-6/3.1.2, as follows.) 3.1.2 Plating between Forepeak Bulkhead and 0.3L from FP (1 June 2014) Within the forepeak bulkhead and the 0.3L from FP, the side shell plating is to be not less than as given in 3-6/3.1.1 with Becalculated at the actual location and with the following permissible

33、stress. f1= permissible bending stress in the longitudinal direction, in N/cm2(kgf/cm2, lbf/in2) = 0.43SmfyAt 0.3L from AP, for L 190 m (623 ft) = 0.60SmfyAt fore peak bulkhead location, for L 190 m (623 ft) Linear interpolation is to be used for the intermediate location. = 0.60 + 0.10 (190 L)/40 S

34、mfy for L 190 m (623 ft) f2= permissible bending stress in the transverse direction, in N/cm2(kgf/cm2, lbf/in2) = 0.85Smfy. (Delete Subparagraph 3-6/3.1.3.) Notice No. 5 June 2014 ABSGUIDE FOR BUILDING AND CLASSING FLOATING OFFSHORE LIQUEFIED GAS TERMINALS .2010 7 3.3 Side Frames and Longitudinals (

35、Revise Subparagraph 3-6/3.3.1, as follows.) 3.3.1 Side Frames and Longitudinals Forward of Forepeak Bulkhead (1 June 2014) The net section modulus of side longitudinals and frames in association with the effective plating to which they are attached, is to be not less than that obtained from the foll

36、owing equation: SM = M/fbiin cm3(in3) M = 1000ps2/k in N-cm (kgf-cm, lbf-in) where k = 12 (12, 83.33) p = nominal pressure |pi pe|, in N/cm2(kgf/cm2, lbf/in2), as specified in 3-3/Table 3 with the following modifications. i) Atiis to be calculated at the forward or aft end of the tank, whichever is

37、greater. ii) Aeis to be calculated in accordance with 3-3/5.5.3 using L.C.7 with kfo= 1.0 and xolocated amidships. iii) Beis to be calculated in accordance with 3-3/5.5 (ps+ ku pd , full draft, heading angle = 0, ku= 1.1), with the distribution of pd, as shown in 3-6/Figure 1, at the side longitudin

38、al and frame under consideration. fbi= 0.85Smfyin N/cm2(kgf/cm2, lbf/in2) Smand fyare as defined in 3-4/7.3.1. s and are as defined in 3-4/7.5. For side longitudinal/stiffener in the region forward of the forepeak bulkhead and above LWL, the section modulus is not to be less than obtained from the a

39、bove equation based on p = pb, fb= 0.95 Smfyand k = 16 (16, 111.1), where pbis as defined in 3-6/3.1 above. (Add new Subparagraph 3-6/3.3.2, as follows.) 3.3.2 Side Frames and Longitudinals between Forepeak Bulkhead and 0.3L from FP (1 June 2014) Aft of the forepeak bulkhead and forward of 0.3L from

40、 the FP, the side frames and longitudinals are to be not less than as given in 3-4/9.7 with Becalculated at the actual location and with the following permissible stress. fbi= permissible bending stress, in N/cm2(kgf/cm2, lbf/in2) = 0.75Smfywithin 0.4L amidships = 0.85 SmfyForepeak bulkhead Linear interpolation is to be used for the intermediate location.