Urgent Rule Change Notice 1 to 01 JAN 2015 version

Transcription

1 Common Structural Rules or Bul Carriers and Oil Taners Urgent Rule Change Notice 1 to 01 JAN 2015 version Notes: (1) These Rule Changes enter into orce on 1 st July Copyright in these Common Structural Rules is owned by each ACS ember as at 1st January Copyright ACS The ACS members, their ailiates and subsidiaries and their respective oicers, employees or agents (on behal o whom this disclaimer is given) are, individually and collectively, reerred to in this disclaimer as the "ACS embers". The ACS embers assume no responsibility and shall not be liable whether in contract or in tort (including negligence) or otherwise to any person or any liability, or any direct, indirect or consequential loss, damage or expense caused by or arising rom the use and/or availability o the inormation expressly or impliedly given in this document, howsoever provided, including or any inaccuracy or omission in it. For the avoidance o any doubt, this document and the material contained in it are provided as inormation only and not as advice to be relied upon by any person. Any dispute concerning the provision o this document or the inormation contained in it is subject to the exclusive jurisdiction o the English courts and will be governed by English law.

2 COON STRUCTURA RUES URGENT RUE CHANGE NOTCE 1 COON STRUCTURA RUES FOR BUK CARRERS AND O TANKERS URGENT RUE CHANGE NOTCE 1 This document contains amendments within the ollowing arts and chapters o the Common Structural Rules or Bul Carriers and Oil Taners, 1 January The amendments are eective on 1 July For technical bacground or Rule Changes in this present document, reerence is made to separate document Technical Bacground or this Rule Change Notice. art Chapter Section aragraph/figure/table Eective Date Symbols 1 st July st July st July Symbols 1 st July Table 2, Table,..1 1 st July st July Table 1 st July Table 5 1 st July 2017 AGE 2 OF 10

3 COON STRUCTURA RUES URGENT RUE CHANGE NOTCE 1 ART 1 GENERA HU REQUREENTS CHATER 4 OADS SECTON 4 HU GRDER OADS SYBOS For symbols not deined in this section, reer to Ch 1, Sec 4. x : X coordinate, in m, o the calculation point with respect to the reerence coordinate system deined in Ch 4, Sec 1, C w β : Wave coeicient, in m, to be taen as: 00 C w or C or w 50 C w or : Heading correction actor, to be taen as: For strength assessment: β = 1.05 or HS and FS load cases or the extreme sea loads design load scenario. β = 0.8 or BSR and BS load cases or the extreme sea loads design load scenario. β = 1.0 or HS, HSA, FS, OST and OSA load cases or the extreme sea loads design load scenario. β = 1.0 or ballast water exchange at sea, harbour/sheltered water and accidental looded design load scenarios. For atigue assessment: β = 1.0. ps : Coeicient, as deined in Ch 4, Sec. BSR, BS, HS, HSA, FS, OST, OSA: Dynamic load cases, as deined in Ch 4, Sec 2. AGE OF 10

4 COON STRUCTURA RUES URGENT RUE CHANGE NOTCE 1 SECTON 5 EXTERNA OADS 1 SEA RESSURE 1. External dynamic pressures or strength assessment 1..2 Hydrodynamic pressures or HS load cases The hydrodynamic pressures, W, or HS-1 and HS-2 load cases, at any load point, in N/m2, are to be obtained rom Table 2. See also Figure 2 and Figure. oad case HS-1 W max HS, gz TC HS-2 W max HS, gz TC Table 2 : Hydrodynamic pressures or HS load cases Wave pressure, in N/m 2 z TC TC z hw TC z h W T C W g z T W, W C W 0. 0 where: HS ps nl h a p yz C w HS ps nl h a p yz C w Hydrodynamic pressures or FS load cases The hydrodynamic pressures, W, or FS-1 and FS-2 load cases, at any load point, in N/m2, are to be obtained rom Table 6. See also Figure 2 and Figure. oad case FS-1 W max FS, gz TC FS-2 W max FS, gz TC Table 6 : Hydrodynamic pressures or FS load cases Wave pressure, in N/m 2 z TC TC z hw TC z h W T C W g z T W, W C W 0. 0 where: FS FS ps nl ps h nl a h p a p yz C yz w C w AGE 4 OF 10

5 COON STRUCTURA RUES URGENT RUE CHANGE NOTCE 1 CHATER 5 HU GRDER STRENGTH SECTON 1 HU GRDER YEDNG STRENGTH SYBOS For symbols not deined in this section, reer to Ch 1, Sec 4. sw : ermissible hogging and sagging vertical still water bending moment in intact seagoing condition, in Nm, at the hull transverse section considered, deined in Ch 4, Sec 4, [2.2.2]. sw-p : ermissible hogging and sagging vertical still water bending moment or harbour/sheltered water operation, in Nm, at the hull transverse section considered, as deined in Ch 4, Sec 4, [2.2.]. sw- : ermissible hogging and sagging vertical still water bending moment in looded condition at sea, in Nm, at the hull transverse section considered, as deined in Ch 4, Sec 4, [2.2.4]. wv : Vertical wave bending moment in seagoing condition, in Nm, in intact or looded conditions at the hull transverse section considered, deined in Ch 4, Sec 4, [.1.1]. wh : Horizontal wave bending moment, in Nm, at the hull transverse section considered, deined in Ch 4, Sec 4, [..1] Q sw : ermissible positive or negative still water shear orce or seagoing operation, in N, at the hull transverse section considered, as deined in Ch 4, Sec 4, [2..]. Q sw-p : ermissible positive or negative still water shear orce or harbour/sheltered operation, in N, at the hull transverse section considered, as deined in Ch 4, Sec 4,[ 2..4]. Q sw- : ermissible positive or negative still water shear orce or in looded condition at sea, in N, at the hull transverse section considered, as deined in Ch 4, Sec 4, [2..5]. Q wv : Vertical wave shear orce in seagoing condition, in N, in intact or looded conditions at the hull transverse section considered, deined in Ch 4, Sec 4, [.2.1]. Q sw-cd : Vertical still water shear orce or the considered loading condition in seagoing operation, in N, at the hull transverse section considered. Q sw-cd-p :Vertical still water shear orce or the considered loading condition in harbour/sheltered operation, in N, at the hull transverse section considered. Q sw-cd- :Vertical still water shear orce or the considered looded condition in seagoing operation, in N, at the hull transverse section considered. x : X coordinate, in m, o the calculation point with respect to the reerence coordinate system deined in Ch 1, Sec 4, [.6]. V D : Vertical distance to the equivalent dec line, in m, as deined in [1.4.]. z : coordinate, in m, o the calculation point with respect to the reerence coordinate system deined in Ch 1, Sec 4, [.6]. z n : coordinate, in m, o horizontal neutral axis o the hull transverse section with net scantling deined in 1.2, with respect to the reerence coordinate system deined in Ch 1, Sec 4, [.6]. y-n50 : Net moment o inertia, in m 4, o the hull transverse section about its horizontal neutral axis, to be calculated according to [1.5]. z-n50 : Net moment o inertia, in m 4, o the hull transverse section about its vertical neutral axis, to be calculated according to [1.5]. A-n50 : Net section modulus, in m, at any point o the hull transverse section, to be calculated according [1.4.1]. B-n50, D-n50 : Net section moduli, in m, at bottom and dec, respectively, to be calculated according to [1.4.2] and [1.4.] AGE 5 OF 10

6 COON STRUCTURA RUES URGENT RUE CHANGE NOTCE 1 VD : coordinate, in m, taen equal to V D +z n. C w : Wave parameter deined in Ch 4, Sec 4. : Seawater density, taen equal to t/m. β : Heading correction actor, to be taen as: β = 1.05 or seagoing conditions. β = 1.0 or ballast water exchange at sea, harbour/sheltered water and accidental looded design load scenarios. 2 HU GRDER BENDNG ASSESSENT 2.2 Normal Stresses The normal stresses, σ in N/mm2, induced by vertical bending moments are given in Table 2: Table 2: Normal stress, σ Operation Normal stress, σ At any point located below VD At bottom (1) ) At dec (1) Seagoing An50 An Bn50 Bn Dn50 Dn Harbour/sheltered waters sw p 10 sw p 10 sw p 10 An50 Bn50 Dn50 Flooded condition at sea or bul carriers having a length o 150m or above sw wv 10 sw wv 10 sw wv 10 An50 Bn50 Dn50 (1) The σ values at bottom and dec, correspond to the application o ormula given or any point, calculated at equivalent dec line and at baseline. AGE 6 OF 10

7 COON STRUCTURA RUES URGENT RUE CHANGE NOTCE Extent o high tensile steel Vertical extent The vertical extent o higher strength steel, hts,i, in m, used in the dec zone or bottom zone and measured respectively rom the moulded dec line at side or baseline is not to be taen less the value obtained rom the ollowing ormula, see Figure : hts, i z1 1 where: perm, i 1 : Distance rom horizontal neutral axis to moulded dec line or baseline respectively, in m. perm,i : ermissible hull girder bending stress o the considered steel, in N/mm2, as given in Table 1 and Figure. : Hull girder bending stress, at moulded dec line or at baseline respectively, in N/mm2 given in Table. Table : Hull girder stresses at baseline and moulded dec line Operation At baseline At moulded dec line 10 bl zn d ( zd S zn )10 yn50 yn50 Seagoing 10 bl zn d ( zds zn )10 Harbour/sheltered water Flooded condition at sea or bul carriers having a length o 150m or above bl bl yn50 p yn50 yn50 z n 10 z n 10 z d-s : Distance rom baseline to moulded dec line at side, in m. d d yn50 p yn50 yn50 ( z ds ( z z d S n )10 z n )10. Acceptance criteria..1 ermissible vertical shear orce The positive and negative permissible vertical shear orces are to comply with the ollowing criteria: For seagoing operation: Q Q Q Q R Q R Q For harbour/sheltered water operation: Q p Q R For looded condition at sea o bul carriers having a length o 150m or above: Q Q Q R where: Q R : Total vertical hull girder shear capacity, in N, as deined in [.2.1]. AGE 7 OF 10

8 COON STRUCTURA RUES URGENT RUE CHANGE NOTCE 1 SECTON 2 HU GRDER UTATE STRENGTH 2 CHECKNG CRTERA 2.2 Hull girder ultimate bending loads The vertical hull girder bending moment, in hogging and sagging conditions, to be considered in the ultimate strength chec is to be taen as: S sw U W wv S sw U W wv where: sw-u wv : ermissible still water bending moment, in Nm, in hogging and sagging conditions at the hull transverse section considered as deined in Table 1. : Vertical wave bending moment, in Nm, in hogging and sagging conditions at the hull transverse section considered as deined in Ch 4, Sec 4, [.1]. γ s : artial saety actor or the still water bending moment, as deined in Table 2. γ w : artial saety actor or the vertical wave bending moment, as deined in Table 2. β : Heading correction actor, as deined in Sec 1, Hull Girder Yielding Strength, SYBOS AGE 8 OF 10

9 COON STRUCTURA RUES URGENT RUE CHANGE NOTCE 1 CHATER 9 FATGUE SECTON 1 GENERA CONSDERATONS 7 OAD CASES Table : Fraction o time or each loading condition o bul carriers Ship length < 200 m > 200 m oading conditions BC-A BC-B, BC-C Homogeneous Alternate Normal Ballast Heavy Ballast (1) Homogeneous Alternate Normal Ballast Heavy Ballast (1) For BC-B and BC-C without heavy ballast cargo hold, raction o time or normal ballast is 0% and or heavy ballast 0%. a (j) AGE 9 OF 10

10 COON STRUCTURA RUES URGENT RUE CHANGE NOTCE 1 SECTON FATGUE EVAUATON 5 FATGUE DAAGE CACUATON Table 5: Time in corrosive environment, T c ocation o weld joint or structural detail Water ballast tan Oil cargo tan Time in corrosive environment T c, in years 510 ower part (1) o bul cargo hold and water ballast cargo hold Bul cargo hold and water ballast cargo hold except lower part (1) Void space 25 Other areas (1) ower part means cargo hold below a horizontal level located at a distance o 00 mm below the rame end bracets or hols o single side sin construction or 00 mm below the hopper tan upper end or holds o double side sin construction (see t 2, Ch 1, Sec 2, Figure 1). AGE 10 OF 10