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 www.transportanalysis.com Report template revision: R.1.5
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Transport Analysis Report Full Stability Analysis Project ... R… · Transport Analysis Report Full Stability Analysis ... Resolution A.749(18) ... TRANSPORT ANALYSIS REPORT Full
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TRANSPORT ANALYSIS REPORT Full Stability Analysis EXAMPLE PROJECT
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TABLE OF CONTENTS 1.0� GENERAL ..................................................................................................................................... 4�
TRANSPORT ANALYSIS REPORT Full Stability Analysis EXAMPLE PROJECT
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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 A.749(18) as
amended by resolution MSC.75(69). 3. “Online Moses Reference Manual”, UltraMarine
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1.0 GENERAL
1.1 Introduction This report presents a full transport analysis on request of SPT Offshore b.v. for the EXAMPLE PROJECT Demo run for reviewProject. 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.
1.2 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
1.3 Design Criteria This section presents the design criteria used for the transport.
1.3.1 Floating condition, - Static heel should be smaller than 0.5 degree. - Pitch should be between 0.0 to 0.2 degree aft down.
1.3.2 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 1.4
Furthermore the IMO intact stability requirements for pontoons, ref.2, 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 0.08 meter-radian ( = 4.58 m.degree)
• The static angle of heel due to wind with speed 30 m/s (=58.4 knot) should not exceed and heel angle corresponding to half the freeboard. For this transport the maximum wind heel should not exceed 7.2 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 = 20.0 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 1.4
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1.3.3 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. 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:
For this analysis the following wind data have been used:
• Intact Condition: 40.0 kn (1 min mean velocity @ 10 m above sealevel) • Damaged Condition: 40.0 kn (1 min mean velocity @ 10 m above sealevel)
Wind profile has been based on ABS.
1.4 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 = 5.0 m seastate • 0.5 m/s current The wave drift forces will not be calculated for this analysis. An estimate will be used based on the following empirical formula: Fwave = 1.5 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 0.75 is used.
1.5 Design Velocity The design transport velocity will be 7 kn. This value will be used to estimate the tow resistance.
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1.6 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
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
1.7 Barge Characteristic The following cargo barge have been used: Name = Barge AMT Discoverer Model name = amt_Disc Length = 91.7 m Width = 30 m Depth = 7.6 m Lightship = 2325.00 Ton with VCG at 4.40 m above keel
1.8 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 = 91.7 m Equal to the length of the barge Wave Height = 5.8 m Wave height has been based on the following empirical formula: 0.607*L^0.5 m
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2.0 SUMMARY OF RESULTS AND CONCLUSIONS
2.1 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. 1.
2.2 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.
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3.0 COMPUTER MODEL
3.1 General This chapter presents the description of the model that has been used for the hydrostatic analysis of the transport. 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: http://www.ultramarine.com/ The computer model used for this run has been developed by Online Marine Engineering and bears revision code M.1.5.A.1.14.. 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 3.1.
Figure 3.1 Definition of marine co-ordinate system
3.2 Description of the barge model To calculate stability a single body model is used. This model consists of one rigid body composed of several compartments with the following properties: Compartment Type Remark Barge Standard Strip theory model Barge Ballast Tanks
Standard All tanks have been modelled
Table 3.1 Compartment properties The weights of all items have been modelled as point loads with correct inertia properties.
x
y
x
z
x
y
z
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4.0 HYDROSTATIC ANALYSIS
4.1 General The scope of the hydrostatic analysis is to analyse the floating condition including intact and damaged stability of the transport.
4.2 Hydrostatic Results The following table presents the results of the hydrostatic analysis. Units Remarks Tow condition Intact Mean Draft 3.80 m Heel 0.00 Degree Trim 0.20 Degree Positive is Aft down Displacement 9717.71 Ton Barge Displacement Minimum GM 18.63 m Based on barge displacement Positive range of stability 58.00 Degree Including free surface correction Static wind angle 0.16 Degree For 40 knots wind Dynamic Safety Factor 58.94 For 40 knots wind Area up to maximum lever 86.06 m.Degree
Table 4.1 Tow condition Intact results Units Remarks Damaged tank WP6 Mean Draft 3.78 m Heel -0.23 Degree Trim 0.12 Degree Positive is Aft down Displacement 9655.34 Ton Barge Displacement Minimum GM 17.12 m Based on barge displacement Positive range of stability 58.00 Degree Including free surface correction Static wind angle -0.05 Degree For 40 knots wind Dynamic Safety Factor 56.49 Minimum freeboard 3.66 m At barge corner
Table 4.2 Tow condition Damaged tank WP6 Attachment 1 presents the detailed output of the MOSES hydrostatic analysis.
4.3 Intact Stability Check
4.3.1 NDI Guidelines
The hydrostatic analysis revealed that all intact stability requirements as set by Noble Denton International (NDI), ref. 1, have been met. The following checks have been performed: Range of Stability The range of intact static stability for the transport is 58.00 degree. The minimum required range of stability is: 36.00 degree It can be concluded that the range of stability is adequate for this transport. Wind overturning check The found area ratio for the intact condition is 58.94, which shows that the minimum requirement area
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ratio of 1.40 can be met.
4.3.2 IMO Criteria
The hydrostatic analysis revealed that all intact stability requirements as set IMO ref. 2, have been met. The following checks have been performed: Range of Stability The range of intact static stability for the transport is 58.00 degree. The minimum required range of stability is: 20.00 degree It can be concluded that the range of stability is adequate for this transport. Stability Curve Area Check Area under the righting lever curve up to the angle of maximum righting lever is 86.06 m.Degree. The minimum required Area is: 4.58 m.Degree It can be concluded that the Area under the righting lever curve is adequate for this transport. Wind Heel check The intact wind heel for the transport is 0.34 degree. The maximum allowed wind heel is: 7.22 degree It can be concluded that the wind heel criterion is met for this transport.
4.4 Damaged Stability Check
4.4.1 Range of Stability The range of damaged static stability for the transport is 58.00 degree. The minimum required range of stability is: 15 degree It can be concluded that the range of stability is adequate for this transport.
4.4.2 Wind overturning check The found area ratio for the damaged condition is 56.49, which shows that the minimum requirement area ratio of 1.4 can be met.
4.5 Barge Longitudinal Loading
4.6 Barge Longitudinal Loading The barge longitudinal loading has been calculated considering the weight distribution of the barge, cargo and ballast water and the loading due to a hogging and sagging wave. The following Stillwater loadings have been found: Maximum bending moment = 2.75099E4 Ton.m Minimum bending moment = -102.6 Ton.m Maximum Shear loading = 1151.2 Ton Minimum Shear loading = -993.0 Ton The following governing loadings have been found for the Hogging and Sagging load condition:
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Maximum bending moment = 6.54409E4 Ton.m Maximum Shear loading = 2171.0 Ton A detailed report and plots of the longitudinal loading calculations can be found in the MOSES output included in attachment 1.
4.7 Bollard Pull analysis Minimum towline pull required (TPR) has been computed for zero forward speed against the following conditions acting simultaneously: • 20 m/s (40 kn)wind • Hs = 5.0 m seastate • 0.5 m/s current The wave drift forces have not be calculated for this analysis. An estimate has been used based on the following empirical formula: Fwave = 0.5 x Barge Width x Barge Draft = 57.0 Ton Found Minimum towline pull including estimated wave drift force is: TPR = 84.7 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 0.75 is used. BP = 84.7/ 0.75 = 112.9 Ton For the design speed of 7.0 kn, the drag at transport draft is: 73.6 Ton. The Froude number at this speed is FR = v/(g.L)^0.5 = 0.12 . For Froude numbers large than 0.11 wave resistance will start to dominate and should be added to the above reported drag resistance to find the total resistance during tow at the design speed.
TRANSPORT ANALYSIS REPORT Full Stability Analysis EXAMPLE PROJECT
+++ C A T E G O R Y S T A T U S F O R S E L E C T E D P A R T S +++ ===========================================================================
Process is DEFAULT: Units Are Degrees, Meters, and M-Tons Unless Specified
Results Are Reported In The Part System
Weight Buoyancy /--- Center of Gravity --/ Category Factor Factor Weight X Y Z Buoyancy --------- --------- --------- -------- --------- --------- --------- ---------
+++ H Y D R O S T A T I C C O E F F I C I E N T S +++ =======================================================
For Body MODEL
Process is DEFAULT: Units Are Degrees, Meters, and M-Tons Unless Specified
Wetted Load To Change /----- For 0 KG -----/ /--- Condition ---/ Displacement Surface Draft 1 MM Moment To Change .01 Deg Draft Trim Roll ------------ --------- -------------- --- Heel --- --- Trim ---
+++ S T A B I L I T Y S U M M A R Y +++ =========================================
The Following Intact Condition ============================== Draft = 3.80 M Roll = 0.00 Deg Pitch = 0.00 Deg VCG = 3.65 M Axis Angle = 0.00 Deg Wind Vel = 40.00 Knots
Passes All of The Stability Requirements: =========================================
Area Ratio >= 1.40 RA/HA Ratio >= 0.00 Dfld Height @ Equilibrium >= 0.00 M GM >= 0.00 M Arm Area @ Max Right. Arm >= 0.00 M*Deg Arm Area @ Dfld >= 0.00 M*Deg Arm Area @ 40 Degrees >= 0.00 M*Deg Area Under Righting Arm >= 0.00 M*Deg Static Heel w/o Wind <= 90.00 Deg Static Heel Due to Wind <= 90.00 Deg Range (Second Intercept) >= 36.00 Deg 2nd - 1st Intercepts >= 0.00 Deg Dfld Angle - 1st Interc. >= 0.00 Deg Angle @ Max Righting Arm >= 0.00 Deg Downflood Angle >= 0.00 Deg
With The Stability Results: ===========================
Area Ratio = 58.94 Passes RA/HA Ratio = 80.56 Passes Dfld Height @ Equilibrium = 0.00 M Passes GM = 18.63 M Passes Arm Area @ Max Right Arm = 86.06 M*Deg Passes Arm Area @ Dfld = 241.16 M*Deg Passes Arm Area @ 40 Degrees = 172.12 M*Deg Passes Area Under Righting Arm = 241.15 M*Deg Passes Static Heel w/o Wind = 0.03 Deg Passes Static Heel Due to Wind = 0.16 Deg Passes Range = 58.00 Deg Passes 2nd - 1st Intercepts = 57.84 Deg Passes Dfld Angle - 1st Interc. = 57.84 Deg Passes Angle @ Max Right Arm = 24.00 Deg Passes Downflood Angle = 58.00 Deg Passes
+++ S T A B I L I T Y S U M M A R Y +++ =========================================
The Following Intact Condition ============================== Draft = 3.80 M Roll = 0.00 Deg Pitch = 0.00 Deg VCG = 3.65 M Axis Angle = 0.00 Deg Wind Vel = 58.40 Knots
Passes All of The Stability Requirements: =========================================
Area Ratio >= 0.00 RA/HA Ratio >= 0.00 Dfld Height @ Equilibrium >= 0.00 M GM >= 0.00 M Arm Area @ Max Right. Arm >= 4.58 M*Deg Arm Area @ Dfld >= 0.00 M*Deg Arm Area @ 40 Degrees >= 0.00 M*Deg Area Under Righting Arm >= 0.00 M*Deg Static Heel w/o Wind <= 90.00 Deg Static Heel Due to Wind <= 7.22 Deg Range (Second Intercept) >= 20.00 Deg 2nd - 1st Intercepts >= 0.00 Deg Dfld Angle - 1st Interc. >= 0.00 Deg Angle @ Max Righting Arm >= 0.00 Deg Downflood Angle >= 0.00 Deg
With The Stability Results: ===========================
Area Ratio = 27.65 Passes RA/HA Ratio = 37.79 Passes Dfld Height @ Equilibrium = 0.00 M Passes GM = 18.63 M Passes Arm Area @ Max Right Arm = 86.06 M*Deg Passes Arm Area @ Dfld = 241.16 M*Deg Passes Arm Area @ 40 Degrees = 172.12 M*Deg Passes Area Under Righting Arm = 241.15 M*Deg Passes Static Heel w/o Wind = 0.03 Deg Passes Static Heel Due to Wind = 0.34 Deg Passes Range = 58.00 Deg Passes 2nd - 1st Intercepts = 57.66 Deg Passes Dfld Angle - 1st Interc. = 57.66 Deg Passes Angle @ Max Right Arm = 24.00 Deg Passes Downflood Angle = 58.00 Deg Passes
+++ S T A B I L I T Y S U M M A R Y +++ =========================================
The Following Damaged Condition =============================== with WP6 Damaged Draft = 3.78 M Roll = -0.23 Deg Pitch = 0.12 Deg VCG = 3.65 M Axis Angle = 0.00 Deg Wind Vel = 40.00 Knots
Passes All of The Stability Requirements: =========================================
Area Ratio >= 1.40 RA/HA Ratio >= 0.00 Dfld Height @ Equilibrium >= 0.00 M GM >= 0.00 M Arm Area @ Max Right. Arm >= 0.00 M*Deg Arm Area @ Dfld >= 0.00 M*Deg Arm Area @ 40 Degrees >= 0.00 M*Deg Area Under Righting Arm >= 0.00 M*Deg Static Heel w/o Wind <= 90.00 Deg Static Heel Due to Wind <= 90.00 Deg Range (Second Intercept) >= 15.00 Deg 2nd - 1st Intercepts >= 0.00 Deg Dfld Angle - 1st Interc. >= 0.00 Deg Angle @ Max Righting Arm >= 0.00 Deg Downflood Angle >= 0.00 Deg
With The Stability Results: ===========================
Area Ratio = 56.49 Passes RA/HA Ratio = 78.37 Passes Dfld Height @ Equilibrium = 0.00 M Passes GM = 17.12 M Passes Arm Area @ Max Right Arm = 78.32 M*Deg Passes Arm Area @ Dfld = 221.23 M*Deg Passes Arm Area @ 40 Degrees = 157.70 M*Deg Passes Area Under Righting Arm = 221.22 M*Deg Passes Static Heel w/o Wind = -0.23 Deg Passes Static Heel Due to Wind = -0.05 Deg Passes Range = 58.00 Deg Passes 2nd - 1st Intercepts = 57.82 Deg Passes Dfld Angle - 1st Interc. = 57.82 Deg Passes Angle @ Max Right Arm = 24.00 Deg Passes Downflood Angle = 57.77 Deg Passes