Transport Analysis Report Full Stability Analysis Project ...

1 ONLINE MARINE ENGINEERING Transport Analysis Report full Stability Analysis Project example Project DEMO RUN FOR REVIEW Client ORCA OFFSHORE Issue Date 18/11/2010 Report reference number: Herm-18-Nov-10-47718 Report Prepared by: Online Marine Engineering Report template revision: Transport Analysis Report full Stability Analysis example Project Page Date : : 2 of 12 18/11/2010 ONLINE MARINE ENGINEERING TABLE OF CONTENTS GENERAL .. 4 Introduction .. 4 Scope .. 4 Design Criteria .. 4 Bollard pull requirement .. 5 Design Velocity .. 5 Cargo characteristics .. 6 Barge Characteristic .. 6 Barge Longitudinal Loading .. 6 SUMMARY OF RESULTS AND CONCLUSIONS .. 7 Summary of Results .. 7 Conclusions.

2 7 COMPUTER MODEL .. 8 General .. 8 Description of the barge model .. 8 HYDROSTATIC Analysis .. 9 General .. 9 Hydrostatic Results .. 9 Intact Stability Check .. 9 Damaged Stability Check .. 10 Barge Longitudinal Loading .. 10 Barge Longitudinal Loading .. 10 Bollard Pull Analysis .. 11 Attachment 1: Computer Output Transport Analysis Report full Stability Analysis example Project Page Date : : 3 of 12 18/11/2010 ONLINE MARINE ENGINEERING References 1. General Guidelines for Marine Transportation . Noble Denton International Limited, Rep No. 0030/NDI/JR Rev. 4, March 2010. 2. Code on Intact Stability . IMO Sales number IA874E2nd edition 2002, Resolution (18) as amended by resolution (69). 3. Online Moses Reference Manual , UltraMarine Transport Analysis Report full Stability Analysis example Project Page Date : : 4 of 12 18/11/2010 ONLINE MARINE ENGINEERING GENERAL Introduction This Report presents a full Transport Analysis on request of SPT Offshore for the example Project Demo run for reviewProject.

3 The Report presents the used input data and a full Report of the Analysis . This box can be used to enter your Project specific text in the introduction of the Report . This Report has been created online without any human interference. The client should carefully check the input and output before the results can be used. It is the sole responsibility of the client to assure that the results are correct. Scope The scope of this Report is to present the hydrostatic characteristics of this Transport . The Analysis includes: Floatation Analysis Stability check according Noble Denton Bollard-pull calculation Design Criteria This section presents the design criteria used for the Transport .

4 Floating condition, - Static heel should be smaller than degree. - Pitch should be between to degree aft down. Stability requirements, The criteria as recommended by Noble Denton International (NDI), ref. 1, will be followed. The following criteria will be checked for intact and damaged condition: 1. Intact Stability Minimum range of intact static Stability : 36 Degree Dynamic safety factor should be larger than Furthermore the IMO intact Stability requirements for pontoons, , need to be adhered to as well. Area under the righting lever curve up to the angle of maximum righting lever should not be less than meter-radian ( = ) The static angle of heel due to wind with speed 30 m/s (= knot) should not exceed and heel angle corresponding to half the freeboard.

5 For this Transport the maximum wind heel should not exceed Degree The minimum range of Stability should be: For L =< 100 m PRS>20 degree For L= > 150 m PRS>15 degree For intermediate length PRS by interpolation For this pontoon minimum range = Degree 2. Damaged Stability The Transport will be checked for one compartment Stability using the following criteria: Minimum range of damaged static Stability : 15 Degree Dynamic safety factor should be larger than Transport Analysis Report full Stability Analysis example Project Page Date : : 5 of 12 18/11/2010 ONLINE MARINE ENGINEERING Environmental conditions Design Storm The design storm for the Transport shall be the 10 year return period monthly extreme storm for the planned route, reduced as appropriate for exposure of less than 30 days.

6 For this Transport the following conditions has been used: Design Wind Intact The 1 minute mean wind velocity at 10 m above sealevel for the design storm shall be used for the overturning moment calculations. In the absence of appropriate wind data the following wind data shall be used: Intact condition: 100 kn Damaged condition 50 kn For this Analysis the following wind data have been used: Intact Condition: kn (1 min mean velocity @ 10 m above sealevel) Damaged Condition: kn (1 min mean velocity @ 10 m above sealevel) Wind profile has been based on ABS. Bollard pull requirement Minimum towline pull required (TPR) will be computed for zero forward speed against the following conditions acting simultaneously: 20 m/s (40 kn)wind Hs = m seastate m/s current The wave drift forces will not be calculated for this Analysis .

7 An estimate will be used based on the following empirical formula: Fwave = x Barge Width (Ton). Minimum required static bollard pull of the tug(s) will be calculated as follows: BP = TPR / Te where Te = the tug efficiency factor. For this Analysis a Te of is used. Design Velocity The design Transport velocity will be 7 kn. This value will be used to estimate the tow resistance. Transport Analysis Report full Stability Analysis example Project Page Date : : 6 of 12 18/11/2010 ONLINE MARINE ENGINEERING Cargo characteristics The following table presents the characteristics of the cargo that has been used for this Analysis . No Name Weight LCG TCG VCG Roll Radius Pitch Radius Length Width Height - Ton m m m m m m m m 1 Accom 2 S1-S8 3 Flare Total Table Cargo characteristics Legend.

8 LCG = Longitudinal Centre of Gravity (From Midship to aft) TCG = Transverse Centre of Gravity (From Barge centreline to Starboard) VCG = Vertical Centre of Gravity (z) (From Barge deck upwards) Roll Radius = Roll Radius of Inertia Pitch Radius = Pitch Radius of Inertia Length = Length of Cargo Width = Width of cargo Barge Characteristic The following cargo barge have been used: Name = Barge AMT Discoverer Model name = amt_Disc Length = m Width = 30 m Depth = m Lightship = Ton with VCG at m above keel Barge Longitudinal Loading The barge longitudinal loading has been calculated considering the weight distribution of the barge, cargo and ballastwater and the loading due to a hogging and sagging wave. The following wave has been used to calculate the longitudinal loading on the barge: Wave Length = m Equal to the length of the barge Wave Height = m Wave height has been based on the following empirical formula: *L^ m Transport Analysis Report full Stability Analysis example Project Page Date : : 7 of 12 18/11/2010 ONLINE MARINE ENGINEERING SUMMARY OF RESULTS AND CONCLUSIONS Summary of Results The Transport with the barge Barge AMT Discoverer for Project example Project has been analysed with regard to intact and damaged Stability and checked against the criteria as set by ref.

9 1. Conclusions The hydrostatic Analysis revealed that all intact Stability requirements as set by Noble Denton International (NDI), ref. 1, have been met. The hydrostatic Analysis revealed that all intact Stability requirements as set by the International Maritime Organisation (IMO), ref. 2, have been met. The hydrostatic Analysis revealed that all damaged Stability requirements as set by Noble Denton Association (NDA), ref. 1, have been met. Transport Analysis Report full Stability Analysis example Project Page Date : : 8 of 12 18/11/2010 ONLINE MARINE ENGINEERING COMPUTER MODEL General This chapter presents the description of the model that has been used for the hydrostatic Analysis of the Transport .

10 For the marine Analysis , MOSES from Ultramarine, has been used. MOSES is a multipurpose marine and structural simulation computer program widely used for Transport and installation design of offshore structures. See the ultramarine internet website for more information on MOSES, address is: The computer model used for this run has been developed by Online Marine Engineering and bears revision code The definition of the co-ordinate system for the marine Analysis is as follows: Origin at barge centre, keel level and centre line. X-axis : Positive from barge bow towards stern Y-axis : Positive towards Starboard side Z-axis : Positive is upwards See figure Figure Definition of marine co-ordinate system Description of the barge model To calculate Stability a single body model is used.