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PETROVIETNAM / NGHIEN CQU TLTONG T A C CUA LL/C THUY D O N G QUA SONG LEN BE CHUA N6I VA TAU CHO KHI HOA LONG TRONG TRANG THAI KHAI T H A C CAP MAN TS Pham Hien Hau Bgi hgc Xay dung Email, phienhau@gmail.cam Tomtit Tdu chd hda Idng (LNGC) cap mgn vdi bichCfa hoa long noi (FLNG) Id phuang dn neo bien vd hiiu qud nhdt di qudng dUimg xudt LNG Id ngdn nhdt, ddm bdo cdng nghi ldm lanh hda Idng d nhiit dp khodng-16^) (luctrdi dat cham) (20) Cong thde eua Pinkster (1975) [17]: (21) LUc thiiy dong cua song tUtfng tdc ISn nhieu vat t h i cap man 4.1 Phuang phdp trUdng trung gian [6,7,15] Vdi bai t o i n tau cap man, dii vting nUde sSu hay nong, van de ehinh l i phii mo t l day dd chuyin d6ng tan sd thap eua h i thdng, ed t l i sdng trdi dat eua sdng Cd phUong phap tinh toin t l i sdng troi dat tan sd thap: Phuong phap trddng gan cda Pinkster [13], trudng xa cua Maruo - Newsman [8,10] va mdi nhat 1^ trudng trung gian cua Chen [6, 71 Ap dung true tiep cic eii biln cCia ly thuylt Stakes va dng dung I)? thuylt ham Green, phUdng phdp 'Trudng gdn" mdi dugc tao vi dUflc Chen phat triln Phuang phdp trUdng trung gian, dupc v i l t cho b l mat gidi han tai mgt khoing cich nhit djnh t d vat the TrUdng trung gian cd elc Uu diem nhif trudng xa, ed hol tu sd nhanh ddi vdi lUc trdi dat ngang Trong trUdng hgp nhieu vat the, trudng trung gian cd the tao be mat gidi han bao quanh tCitig v i t the va tinh toin dugc cac t i i trpng sdng t i e dung l i n vat the dUOc bao quanh do, trudng xa chi eung cap tdng cac tli trpng sdng t r i n tat c l cac vat t h i Bai t o i n tUOng tac nhieu vat t h i cap man l i u^g dung quan trpng eda phUOngpMp trudng trung gian Trang thai cap man lim gia ting tUOng t i e dpng eua sdng trcng khu vue khoing hd giiJfa vat the ,€0.) 4.2 Tuang tdc nhiiu vdt thi cap mgn [1,2,5,7,12} Trong do: Chl sd ^^ bilu dien elc thdng sd bac tuong dng vdi cic tan sd sdng to, oi^; Dau • the hiin liin hop phdc; 54 41 KHl 3/2015 Tuong t i c eua nhieu vat the gdm: tuang t i e ed hoc v i thuy dpng liic hpc TUcmg tac cO hoc dupe djnh nghia bdi c i c dae trUng co hpc cua liin k i t gida eac vat the, cN phu thude vao t h i l t ke va q u i trinh van hinh Tuang tac PETROVIETNAM thdy ddng liic hpe phdc tap hem v l y i u c l u g i l i p h i p d i y du cd ke den taong tac gida cic vat the Trong bai t o i n cap man tau, vijng khoing hd gida t i u , tdOng t i e thCiy dpng luc hpc cd the triet tieu chuyen dgng sdng d mgt vai tan sd sdng nao dd, nhiing lai fgo chuyin dgng dUddi cOa trudng sdng d cae tan sd sdng khic Do dd, can dac b i i t ehu y tdi hien tumg cdng hudng Mpt phuong p h i p mdi dUOe p h i t trien diia tren g i i thiet chit Idng ly tudng cd tfnh den ca c h l c i n chat Idng Phuang trinh chuyin ddng cho nhieu vdt the noi: Phuong trinh ehuyin ddng eho nhieu v i t the (M l i sd vat thi) cd eac hinh thdc tuang t u nhucong thdc (6) v i (4) vdi nhdng thay ddi nhd: M r = F;(22) (o A " ^ + imBl^ = -io)(io} - fi)p Ijds^l'nt (23) Hn HP)=ildscT(Q)G(P,Q) S^HuF'uF (26) s va cac phuang trinh tich phan de xae ^ n h elc ngudn phan phdi o la: 2f[c7iP)+ildsc7(Q)G„iP,Q) s = v„ PczH (27a) 47iu{P)~\\ds(7{Q)G^{P,Q) s =Q PcF' (27b) A7raiP) + isk'\\dscj{Q)G{P,Q)=[) PcF (27e) s F la dien tich ben eua p h i n giao vdi mat dadng nude, cong thdc (27b) de loai bd eae t i n so khong d i u , cdng thdc (27e) viet cho be mat t y F Dieu quan trpng la can sd dyng h i sd c i n E^Od nhdng vung chuyen ddng eCia chit Idng nhay d m vdi cfing hUdng (gida hai tau) 4.3 Vi du vi chia lUdi cdn tgi viing khdng gian gida tau [2, 5} Trong dd duac xie dinh tuang t i i edng thde (5): K = - ( ' ^ -M)POO lfcfe(fiio + !*7)"A (24) Chuyen ddng cdng hudng eda chit Idng tai khoang hd gida t i u l i tuang t i c thCiy ddng luc hpc Chuyen ddng sdng cd t h i dupe triet t i i u hole bi khuech dai phu thufic v i o siiphan tan phdc tap gida elc v i t t h i Vdi l;? thuyet ham ddng tuyln tfnh cd diln, khdng ed bat k^ gidi han n i o de dU doan ehilu cao sdng d b l m i t nude, ehuyin dfing cfing hudng thuc t l phii bj c i n bdi cae ca ehe t i i u tan ning luang khie Su ehuyin ddng khdng cd thue eda chat Idng lam khulch dai t l i trgng sdng t r i n elc vat the Hai sa lan trang thai cap man cd ciing kich thudc: L X B x T - 2,47 x o,6 x 0,18 (m) vdi tinh chat CO hpc Zj = 0,02, ndi t y Ludi eua sa lan va vung khe hd dugc chia nhu vung ein (e = 0,016) Kit q u i Hinh eho thiy: Chilu cao be mat tU Idn dang chij y d tan sd sdng; Kit q u i tinh tcan sd vdi gia tri E = (khdng can) Idn hon nhilu so vdi thUc nghiem vdi he sd can s - 0,016 tUong thich tdt vdi ket q u i thuc nghiim; D l dua chuyin ddng sdng edng hudng v l gan gidng vdi thue te, loai bd chuyin ddng sdng khdng ed thuc, Buehner va nnk [IJ d l p h i t t r i l n phuang p h i p dat mdt nap day (lid) ien tren vung nudc gida hai v i t the di ngin chin elc chuyen ddng sdng phi thiic t l Tuy nhiin t r i n thyc t l , khdng cd dd eao sdng nao edn tdn tai dudi n i p d i y cdng (rigid tid) n i y va ed the quan sit dugc nhieu loan xung quanh d i u ciia n i p h i i u dng nhieu xa Do dd, de cho p h i p x u l t h i i n chuyin dgng gon sdng t r i n Hinh Haisd lan cdp man vd vUng cdn giSO 2sdlan n i p day, Newman [12] dUa phuong p h i p tam tham m i m • • | ' T ' ' (flexible mat) b i n g cich sd dung mgt t i p hgp ham da thde cda Num * = 016 Chebychev sau g i i m di b i n g cich sd dung h i sd can Theo ' :; nghiin edu cua Chen [5], ngoai eae phuang p h i p t r i n , ed t h i I p dung cic phuong trinh chinh xie cua chat Idng ly tudng hoin ; i ; t o i n , cdn sd t i i u t i n ning luong dugc b i l u dien qua h i sd ein E i ; ;^i j n jA Phan t i i u t i n xuat hien d i l u kien biin t r i n b l mat t i i F: (#, - ft V - iot V = PczF{z Vdi k' = toVg va e la he sd t i i u t i n Theo nghien cdu cCia Chen [5], ta ed: = 0) \y (25) 3S 45 5j 65 % ,,, o 7.5 ti "10 95 WinA Cao 3d mdtnudc lai ldm khodng hd{i] DAU KHf-sd 3/2015 55 CONG NGHI - C N G TRJNH D A U KHI thyc nghiem He so c i n e mye dich de tieu Bdngl Cdc thdng so l^lhudt cua FUiGva LNGC Thdng so ' Chieu dai Lpp j Chieu rong I L^uqn^g^hiem nude day ti[^ ,' MdnnU6cdaytiiT Dtfnvi FLNG 258 46 171.930 16,84 LNGC 243 41,6 52.019 6,75 tan nang lugng t r i n be mat t y vi mo hinh tinh coi chat long la ly tUdng.Tae gil seap dung k i t qua nghiin cdu n i y eho phan vidu sd d i l u kiin b i l n Viet Nam Ap dung ti'nh Itfc thuy dong cho tau cap man song song so sanh vdi trtfcfng hop mot tau 5.1 Gidi thiiu phdn mem tinh todn HydroStar la mdt phan m i m tinh toan thuy ddng lUc hoe, doi tugng l i cac tau thuyen hay cie edng trinh b i l n m i m nhU: FPSO, TLP, gian b i n chim Spar HydroStar duac phat trien bdi Oang k i l m Phip (Bureau Veritas BV) t d nam 1991 Hiin nay, HydroStar duoc phat t r i l n phan mem sd 3D di danh HinhJ.SadoFUiGvoLNGCcdpman g i i elc b i i t o i n nhieu xa va bde xa bae 1, bac d dp sau nudc rat Idn hole d dd sau nLf6c hdu ban Cae van de dupe g i l i quylt: Tie ddng ciia sdng bae 1, bae l i n k i t clu (cac bai toan nhieu xa va bde xa), chuyin vi cua kit clu dudi t i c dung cua sdng, ap lUc sdng tai cic diem tren be mat k i t cau, loai bd cac tan so khdng deu, bai toan tuang t i c nhilu vat thi, sii thay doi t i e dfing cua sdng trcng be eang, k i t ndi chUdng trinh eon Gnuplct, BV-Vship cho phep kiem tra va hiln thj k i t qui tinh, tuong thfeh sd dung k i t q u i cho cae ehUOng trinh tinh d i y neo Ariane-3D, ehUong trinh PTHH NASTRAN chc tfnh k i t eau ndi 5.2 Sd liiu ddu vdo Sd i i i u mdi trUdng lay d md Bach Hd [15]: Sdng ngau nhien d d i y dupe die trUng Wfi phd sdng JONSWAP vdi cic thdng sd sdng; H^= 8,6m;Tp= 13,5s, (B^,„= 0,3 rad/s, co^= 1,1 rad/s, Y - 1,45 Gid v i ddng chiy coi la life tinh khdng sd dung nghien cdu Qd sau Hinh8.Hinhdnhchialu6i^anngdpmiScciJaFlNG(BI1jvdFlHG-mGCcdpman(BJ2) nudc 50m d md Bach Hd duge coi la viing Xa miln cdng hudng (noi x i y su tang chieu eao b l mat t i i nude nong so vdi elc vung b i l n khac tren the ldn), he sd cin E [di tieu tan nang luong t r i n be mat tudo) khdng anh hudng den phin dng ehuyen ddng cua sdng Qua cic phin tich cae nghien cdu trudc d i y ve bai toan cap man, gidi da dugc nghien edu Khi tinh tcan Idc thCiy ddng cOa sdng bang chuong trinh HydroStar ein tinh t o i n cho moi can t h i i t phli them vio mfi hinh tinh mdt h i sd cin E * (theo Chen hudng sdng va sdng tfnh t o i n l i sdng dan vi [2] thi E = 0,016) de eho k i t qua tinh theo md hinh tuong thich vdi {sdng ngau nhien la t i p hgp cCia N sdng 56 DAUKHI SO 3/2015 PETROVIETNAM dan Airy CO bien d p a ^ m) d l eho k i t q u i la Luc sdng: So sanh cac k i t qua tUdng duong cOa sdng b i c ham truyen RAO p h i n dng cua ket c l u dUdi t i e va sdng bac cho thay, lue sdng bic rat nhd so vdi lUc sdng bae dung cua luc sdng don vi Cic thong sd ky thuat (vi du vdi cung mdt hUdng sdng la 90° so sinh F^ sdng bae ehi CLia FLNG va LNGC dupe t h i hiin Bing b i n g 2% so vdi F^ sdng bac (chenh lech gan 50 lan) (Hinh 11 a, 5.3 Tinh todn luc thuy dpng cho FLNG cUc trl(BTI) t h i l t k l h i thdng neo eCia FLNG Trong nghien cdu niy, t i e gia thiet lap va so sanh bai tcan: FLNG d i l u kiin cdc tri khdng khai t h i c (BTl) theo [16] va FLNG dang khai thae xuat khf hda ldng cho LNGC d trang thai cap man (BT2) 12a) Cie ket q u i cCia chuyen vi, lUc sdng s i i n h hudng tdi k i t q u i 5.4 LUC thuy dpng cho FLNG - LNGC trgng thdi khai thdc kieu cap mgn (BT2) De ed them co sd lUa chon k i t q u i phye vu thiet k l , c i n p h i i nghiin edu tinh toan lye thuy dgng eho FLNG trudng hgp khai thae cap man (xuat hda Idng) Xit sy tUong t i e thuy ddng Moi bai toan can t h i l t l i p elc file data chc gida t i u th) trudng hop cap man (FLNG va LNGC) quan trpng hOn tdng module tinh t o i n rieng theo so thuat toan trudng hop ndi dudi.Tal vung nude gida tau seed hiin tugng b l eua chuong trinh HydroStar Phin hiln thi k i t q u i mat sdng tang dot nggt Theo nghiin cdu mo hinh tinh t o i n va sd dyng Gnuplot de xem cac hinh i n h RAO va BV- thuc nghiim thay r i n g t r i n thyc t l h i i n tugng cpng hUdng bi t i i u Vship di md phdng chuyen dpng cua cfing trinh t i n mat di nhanh hon sc vdi mfi hinh tinh phan mem Do dudi tie dung eua eae loai t i l sdng vay, ehuang trinh tinh phii them v i o mfit h i sd giam ehan Sau l i p file d d lieu cho cae module va chay module: Hsmsh, Hsiec, Hschk, Hvisu, t i c g i i thu duoc hinh I n h chia ludi phan t d p h i n ngap nude cua bai toan di tinh t o i n lUc thuy dfing (Hinh 8) T i l p tyc cae bUde tinh t o i n theo eac module Hsrdf, Hstat, Hsmee, Hsdft, Hsrao lan luat tfnh luc nhieu xa, bde xa, g i i i phuong trinh (E = 0,016) tai vung egng hudng gida t i u di cho k i t qua tinh gan vdi sd liiu thUc nghiim Tac file cho BV-Vship Cd t h i quan sit duge dao ddng cCia mfi hinh va ap luc sdng l i n tau tren phan m i m tUong tac BV-Vship Can phai khai bao ludi phin td cua khu vyc xung quanh tau cho cd t h i de nhin thay ehuyen ddng de tfnh cic djch ehuyen cua t i u , lyc ddi tuang tinh toan Hinh cho thay mdn nude t i n g dot ngpt t i c ddng b i c cCia sdng (sdng tdi + sdng nhilu khoing hdgida2tau eip man xa), lye trdi dat bac cda sdng theo ly thuylt, xult k i t q u i RAO Cae k i t q u i dugc xuat dddi dang text hole dd thi RAO gdm: Chuyen ddng cua tau theo phuang dpc tryc v i phyong quay quanh true X, y, z, ma t r l n can va ma t r l n khdi lugng kem, eie liic sdng b i c (nhieu xa, lUe sdng tdi), lye t i e ddng cda sdng bac 2, lUc trdi dat, xuat ket q u i RAO, QTF, added mass cho chuong trinh Ariane Whan xet kit qud tinh BTl (bichda So sinh k i t q u i RAO trUdng hgp cue tri (1 tiu) va trudng hgp khai thae t i u d p man: mpt vai k i t q u i chuyin v| dpe true Y, lUc FLNG ddng sdng bac dpc true Y, lUc sdng trfii dat bae doc tryc Y: Chuyen vi dpc QY: trUdng hgp cap man, djch chuyin dpe Y tang dot ngpt quanh a = rad/s (Hinh 10); Liie t i c dpng eua sdng bac (FK va luc nhieu xa): trUdng hgp cap man, F^ cdng hudng quanh to = 0,8rad/s (Hinh 11); Lde troi dat bac 2: trUdng hop d p man, lUe trdi dat bac F^ tang dot ngot quanh co = rad/s (gia tri im) (Hinh 12) ddc ldp): Chuyen vj: phan chuyen vi thang thi chuyen vj dpe OY (sway) la ldn nhat vi ed d i i n tieh chin sdng Idn nhat, ehuyin vi xoay quanh OX (roll) cd ehuyen vi bat Igi n h i t vi tau de bj mat dn dmh theo phuong Tan sd sdng thap (ehu ky dai) (Hinh 10a) thi se cho chuyin vj Idn, cho thay chuyin vj phy thufic chu yeu vac liic trdi dat, luc n i y cd chu k y d i L Hinh Cdng hudng cda chuyen ddng song irong vdng nudc gida tau DiUKHl-Sd3/2015 57 C N G NGHE - CONG TRiNH DAU KHI Hiob 10 RAO chuyen vi theo phuang doc true OYSway: mot tdu (a) - hai tau cdp mgn (b) W « O.Bbn) Fr^RMMao' FT.lWOiai fYflSIIW)(liaiMôô ã FvriSTRlô( 1300*1) FYflSIWOf 1300*11 —^ FrF1STIMl(!«0*gi FYFlSTRMlliajailj) — ' — f//^ 2.^ \,^m FWT^fwxiijim) — * ^ FV3.>W)(I3UMW — FY.ZH«11'S>1"»« rr^HWHUoiMH) ~ ~ XWfUViMti — ^.JTFlSnWOllTOOdiB) — • — FYSl^I HAOl IBOOdlU — H — ;-^\ Hinh 11 RAO lite sdng hoc 1F^ mgl Idu (a) - hoi tdu cap mon S « « h r t B > W B idF, S«ini).on»t Mt Ud f J ^ ^ » ; ^ ^ ^ ^ , g^ M ittumaati —*1 ji-ooe (|!fM(21l]DiilD — * - thmimsuiii —*~ lrtlK3B0«l( — ,.«a/ la) (b) Hinh 12 RAO luc iroldal F, theo ly thuyet Iruimg trung gian: mdt tdu (trdi) - hai lau cdp man (phdi) 5.5 Nhdn xet kit qud trUdng hop nghien cdu tgi md cCia sdng bac la ldn nhat ngoai vung cdng hUdng hinh BachHd dang cae thj RAO cap man tuang ddi gidng vdi cdcKl {do dau vao d i u la sdng don vi a = m) Oac biit, tai tan Cic thj h i m truyen RAO d i u eho thay ro i n h hudng sd quanh co = rad/s cd sy tang dot ngdt v l hinh dlngflfi cda cdng hudng tgi khodng hd giUa be chiia va tdu (vung thj Do dd, can p h l i xem xet khoing t i n sd co = 0,95 cin dampingzone) ddi vdi trudng hop cap man, die b i i t -1,05 rad/s, tde la chu ky khoing T = (s) Do chu ki eOa vdi cae dao dpng dpc OY, lUc sdng F^ bae va life troi dat F sdng Ts = - 20 (s) nen t h i l t k l phli tranh hien t d ^ 58 DAUKHl-so3/2015 ^1 'fM PETROVIETNAM cdng hudng vdi tan sd song gay nguy h i l m eho cfing trinh Quan sat hinh i n h chuyin dong cCia tau (Hinh 9) cho thay mdn nude tang dot ngot vung nude gida tau Ket qua RAO cho thay cdng hUdng khoing hd gida tau cap man khdng chi i n h hudng trUcmg sdng dja phuang ma cdn lam gia tang chuyen dpng b i c cung nhu lUc troi dat trung binh X.B.Chen, F.Rezende, S.Maleniea, J.R.Fournier Advanced hydrodynamic analysis of LNG terminals W^ International Symposium on Practical Design of Ships and Other Floating Structures,Texas, ABS 2007 X.B.Chen Hydrodynamic analysis for offshore LNG terminals 2"'' International Workshop on Applied Offshore Hydrodynamics, Brazil 2005 K^t luan t X.B.Chen Approximation on the quadratic Cfing hudng viJng khoang hd gida tau cap transfer function of low-frequency loads Proceeding of 7"" man tai md Bach Hd I n h hUdng d i n viic tinh toan eae International Conference Behavior Offshore Structures chuyen dfing tUOng ddi tai vj tri giQa tau de xae djnh 1994; 2: p 289-302 t i i trpng thiet ke tac dyng len day neo v i quyet djnh dp X.B.Chen Wetv formulations of the second-order nhay cam eua hoat ddng dd t l i Trong tfnh bai toan wave loads Rapp Technique, NT2840/DR/XC, Bureau cip man, can t h i l t phli t h i m vac md hinh tinh mdt he Veritas, Paris, France 2004 sd c i n £ 3^ (nghiin cdu E - 0,016) di eho ket q u i tinh theo md hinh tinh tuong thich vdi thue nghiem He sd ein e myc dich d l tieu t i n nang Idpng tren be mat tu vi md hinh tinh coi chat ldng la ly tudng Su X.B.Chen Hydrodynamics in naval applications 6"' International offshore and Conference on Hydrodynamics, Perth, Australia 2004 khac biet dot ngdt gida tuang t i e thuy dpng hoc trcng X.^.Chen.Offshore hydrodynamics and applications bai t o i n eye tri va b i i t o i n khai thae c i p man x l y The IE5 Journal Part A: Civil & Structural Engineering 2011; hien tupng chuyen ddng eCia be mat song tang dot ngdt 4(3): p 124-142 (cdng hudng) vung nUde gida t i u , I n h hudng den dp an toan eCia ea he thdng Kit qua nghien cdu t r i n s i gdp p h i n bd sung t h i m v i o cac bai toan tinh t o i n t h i l t k l eho FLNG trudng hap khai thae xuat hda Idng eho tau LNG v i md rdng cho tinh toan cic loai tau cap man khic Tuy d V i i t Nam chUa ed FLNG nhUng vdi tiem nang cic md rat Idn, tUOng lai s i p h i t trien hudng khai thae mdi va h i i u q u i Hien tai, n g h i i n edu cd t h i dng H.Maruo The drift of a body floating on waves Journal of Ship Research 1960; 4: p -10 BernardMolin.Seeond-ofderd/fffocf/on toads upon three-dimensional bodies Applied Ocean Research 1979; 1(4): p 197-202 10 J.N.Newman The drift force and moment on ships /rtivaves Journal of Ship Research 1967; 11:p 51 -60 11 J.N.Newman Second-order, slowly-varying dyng cho tinh t o i n thiet k l neo gid eae loai tau, phuang forces on vessels in irregular waves Proceedings of the t i i n ndi, sa lan djeh vy, phuc vu thi edng, khai thae d Symposium on the Dynamics of Marine Vehicles and trang t h i i cap man Nghien cdu ed t h i i p dyng cho Structures In Waves, London 1974: p 182 -186 b i i toan thiet k l h i thdng neo gid, lien k i t hai tau, t d dd d i n h gia dp an t o i n cua h i thdng neo gid kieu cap man 12 J.N.Newman Progress in wave load computations on offshore structures 23"* OMAE Conference, Vancouver, Canada 2004 Tie g i i tran trcng elm on co quan D i n g kiem Phap (BV) da cho p h i p sCf dyng cie phan m i m chuyen dung (HydroStar, BV-Vship) va Dai hpe Xly dung da tac d i l u kiin di t i c g i i thue h i i n nghien cdu Tai lieu tham khio 13 J.A.Pinkster Low frequency second order wave exciting forces on floating structures 1980 14 J.A.Pinkster Low-frequency phenomena associated with vessels moored at sea Society Petroleum Engineers Journal 1975; 15(6): p 487 - 494, , Bas Buehner, Adri Van Dijk, Jaap De Wilde Numerical multiple-body simulation ofside-by-side mooring to an FPSO Proceeding of 11 "• International Offshore and Polar Engineering (ISOPE) Conference, Stavanger, Norway 17 - 22 June, 2001: p 343 - 353 15 Vietsovpetro Environmental design criteria extreme conditions for the Bach Ho - Rong fields - South East offshore Vietnam 2000 16 Pham Hien Hau Estimation de la fiabilite du CONG NGHE • CONG TRINH DAU KHI systeme d'ancfage des FPSO/FSOs au Vietnam, avec prise en compte de I'accumulation du dommage de fatigue These de Doctoral er Science de llngmieur Unlversite de Liege, Belgique 2010 17 Shell Prelude FLNG in numbers, www.shell.com.a , g (.^,,^ Summers The gas platform that will be the ^^^,^,^ ^j^g^^, ^^^p, www.bbc.com 15/7/2011 Study of the hydrodynamic Interaction of wove loads on the floating facility and the liquefied natural gas carrier during side-by-side offloading operation Pham Hien Hau National University of Civil Engineering Summary Liquefied Natural Gas Carrier (LNGC) is moored side-by-side to the Floating Liquefied Natural Gas facility (FLNG), the most effective and popular mooring method for obtaining the shortest way to transfer gas, and ensuring the frozen technology for liquefied gas at temperature of about - 160°C However this side-by-side offloading operation can create disadvantages for the FLNG facility and LNG carrier This paperpresents the theoretical and experimental studies of the hydrodynamic interaction of wave loads on two floating bodies with large dimension during side-byside offloading operation The obtained study results were applied to Bach Ho field conditions using the HydroStar Software of French Bureau Veritas Register, in order to compare with the case of only one floating facility to evaluate the increase of the wave surface elevation in the gap between the FLNG and the LNGC Finally, the interaction between the wave and the floating facility and tanker in the side-by-side mooring which causes adverse effects for the safety of the exploitation platform was concluded Key words: Hydrodynamic interaction, wave loads, floating liquefied natural gas facility, liquefied natural gas carrier LNG, side-by-side offloading mooring, multiple-body simulations 60 DAUKHI SO 32015 ... k l h i thdng neo eCia FLNG Trong nghien cdu niy, t i e gia thiet lap va so sanh bai tcan: FLNG d i l u kiin cdc tri khdng khai t h i c (BTl) theo [16] va FLNG dang khai thae xuat khf hda ldng... sd dung dl khai t h i c hda Idng Du kiln vac nam 2017, be ehda noi Idn n h i t the gidi (Prelude cua Shell) se neo d ngoai khoi eich 200km t d bd bien phia Tly Bic cua Australia de khai t h i... - LNGC trgng thdi khai thdc kieu cap mgn (BT2) De ed them co sd lUa chon k i t q u i phye vu thiet k l , c i n p h i i nghiin edu tinh toan lye thuy dgng eho FLNG trudng hgp khai thae cap man
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