This document provides the design of foundations and tie-downs for a mooring winch system on a vessel with a 30MT working load. It includes designs for forward and aft mooring winches, as well as an anchor fairleader. Analyses show the proposed tie-down designs are adequate to safely secure the winches and fairleader during offshore operations under a maximum load of 30MT, using allowable stress increases of 1/3 as required by applicable codes. The document also reviews the vessel strength at the winch and fairleader locations.
This document provides the design of foundations and tie-downs for a mooring winch system on a vessel with a 30MT working load. It includes designs for forward and aft mooring winches, as well as an anchor fairleader. Analyses show the proposed tie-down designs are adequate to safely secure the winches and fairleader during offshore operations under a maximum load of 30MT, using allowable stress increases of 1/3 as required by applicable codes. The document also reviews the vessel strength at the winch and fairleader locations.
This document provides the design of foundations and tie-downs for a mooring winch system on a vessel with a 30MT working load. It includes designs for forward and aft mooring winches, as well as an anchor fairleader. Analyses show the proposed tie-down designs are adequate to safely secure the winches and fairleader during offshore operations under a maximum load of 30MT, using allowable stress increases of 1/3 as required by applicable codes. The document also reviews the vessel strength at the winch and fairleader locations.
This document provides the design of foundations and tie-downs for a mooring winch system on a vessel with a 30MT working load. It includes designs for forward and aft mooring winches, as well as an anchor fairleader. Analyses show the proposed tie-down designs are adequate to safely secure the winches and fairleader during offshore operations under a maximum load of 30MT, using allowable stress increases of 1/3 as required by applicable codes. The document also reviews the vessel strength at the winch and fairleader locations.
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FOUNDATION DESIGN FOR
30MT WORKING LOAD WINCH SYSTEM
1 TABLE OF CONTENTS SECTIONS 1 Introduction & Summary 2 Loading & Assumption 3 Aft Mooring Winch System Tie-down Design 31 Aft Mooring Winch Tie-down 32 Anchor !air"eader Tie-down !wd Mooring Winch System Tie-down Design #1 !wd Mooring Winch !oundation #2 !wd Mooring Winch Tie-down Appendix A Typica" $esse" Structure Mem%er &roperties 1' ( Drawings 2) 1 Aft Mooring Winch System Tie-down & Detai"s 2 !wd Mooring Winch System Tie-down & Detai"s 2 Sectin ! Int"d#ctin & S#$$%"& 3 11 I*T+,D-.TI,* - This mooring winch system/s foundation & tie-down design for support 0esse" 1 Sietas 2ard Type 131-A 4 131-( 1 is performed on the %eha"f of our ."ient5 TS&L5 in order to ensure that the proposed mooring system of support 0esse" 1 Sietas 2ard Type 131-A 4 131-( 1 is capa%"e of operating with its %ra6ing "oad of #,MT offshore The proposed winch system consists of 2 !wd winches & 2 aft winches The # nos winches are identica" and are designed for 37MT ma8imum pu""ing "oad with 39mm wire ropes The !wd winches wi"" %e "ocated on forecast"e dec6 portside & star%oard side symmetrica""y from frame :' - 1715377mm from the winch %ase to dec6house %u"6head The mooring "ine wi"" run through the mu"ti-ro""ers fair"eader5 which is seated on the e8isting dou%"e %itts %o""ard %ase a%out ')m in front of mooring winch The aft winches wi"" %e "ocated on she"ter dec6 portside & star%oard side symmetrica""y from frame 1: - 225 1#77mm from sideshe"" to winch %ase The mooring "ine wi"" run astern through anchor fair"eader then through mu"ti-ro""er fair"eader ;a%out #)< out%oard= The anchor fair"eader is "ocated o0er one trans0erse %u"6head ;a%out 2 feet !wd of frame 2= & 2 nos dec6 "ongitudina"s The mu"ti-ro""ers fair"eader is to rep"ace e8isting panama choc6 The mooring "ines wi"" %e in tension to a ma8imum of #7MT of en0ironmenta" forces5 and the %ra6ing capacity of the winch is #7MT5 a dynamic factor 1) to %e considered when designing the winches foundation & seafastenings The scope of wor6 ;this report= is therefore as fo""ows> Design !wd winches/ foundation on forecast"e dec6 Tie-down design for winches %ase ;!wd & aft winches= - Tiedown design for anchor fair"eader ;stem= $esse" strength chec6 at winches "ocation and anchor fair"eader We 0isited the support 0esse" 1Sietas 2ard Type 131-A 4 131-(1 which was %erthed in ?? Shipyard5 Location on ?? During the time we were on %oard5 we discussed the fo""owings> mu"ti-ro""er fair"eader orientation and "ocation to pre0ent chafing of wire rope and their reinforcement anchor fair"eader to %e within )@ of f"eet ang"e - re0iewed the su%mitted report ;AB+-771-7715 +e0 A5 dated on 2747347#= The report uses 37MT to design the winches seafastening"foundation and use 1I1 %eams for winches foundation on 1une0en1 dec6 of the forecast"e dec6 The origina" 1I1 %eam is modified to 1T1 %eam to suit the 1une0en1 dec6 at the forecast"e dec6 12 +BS-LTS ,! A*AL2SIS - The ana"ysis is to comp"y with code of A'I & AISC( *o 1/3 increase of a""owa%"e stress wi"" %e used in the ana"ysis +esu"ts show that the proposed tie-down for mooring winch & anchor fair"eader is adeCuate to maintain them safe"y on the dec6 The e8isting she"ter dec6 & proposed foundation on forecast"e dec6 is adeCuate to support the winch & anchor fair"eader during the offshore operation 4 Sectin ) L%din* + A,,#$ptin 5 2.1 LOADING & ASSUM'TION - The proposed winches are identica" ;on"y symmetrica" a%out portside & star%oard= The ma8imum pu""ing force is 37MT The %ra6ing "oad is #7MT The o0era"" dimension for winch is 2277mm;L= 8 2:77mm ;(= 8 1377mm ;A= Specification> Line &u""> 37MT @ "D "ayer wire 2233MT @ 2nd "ayer wire 2723MT @ 3rd "ayer wire 19#9MT #E "ayer wire F1'MT F ) "ayer wire Line speed> : m"min @ 3- gpm ;inner "ayer= +ope capacity> )77 metres @ G39mm +ope Wor6ing &ressure> 2377 psi A& +eCuired> ') A& / ##7$ / 3,AH / I&3) Weight> )MT ;without wire rope= 9MT ;with wire rope= The first "ayer wire distance to %ottom of winch %ase is - 1137mm The origina" design of 1I1 %eam for winch %ase is 277-. 8 ):)6g"m The distance %etween two 1I1 .e%$ of winch %ase %e 2277-27) = 1::)mm in "ongitudina" direction 6 Sectin 3 A/t M"in* Winc0 S&,te$ Tie1d2n De,i*n 7 8 9 10 11 12 13 14 15 16 25MT Working Load Winch Tie-don !na"#$i$ on %e$$e" 17 18 19 20 21 22 23 24 25 26