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# Pipe Transport Assistant (PTA)

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## Description

***********7 Sep 2021: This product is currently in trial mode, due to be launched in a month’s time**********

Instructions for trial version:
• Open the app, and click on ‘manual activation’. Send your system ID to info@thenavalarch.com
• We’ll send you the key for 1 month trial evaluation.
• The app will stop working after a month of trial.

Introduction
Pipe Transport Assistant (PTA) is a complete suite for carrying out transportation analysis of a vessel carrying linepipes on deck
It includes the following:
Stacking Height calculation
Creation of stowage plan using an interactive worksheet
Calculation of vessel motions and accelerations on pipe bays
Lashing Design
Pipe Sliding/overturning check
Stopper/Stanchion strength assessment
Deck Strength assessement
Bollard Pull Calculator (for barges)

How to use?
The following sequence is to be followed by the user:
Step 1: Input the principal particulars of the vessel, like its dimensions, lightweight etc
Step 2: Identify the types of pipes being carried on the vessel. Pipe types can be characterized by different Outer Diameter (OD), Wall Thickness (WT), Concrete Coating etc.
Step 3: Carry out the stacking height limit assessment for all pipe types using the Stacking Height calculator
Step 4: Determine the number of bays in which pipes can be carried on deck of the vessel. This can be done using the ‘Create Stowage Plan’ button
Step 5: Create the stowage plan of the vessel using the ‘Create Stowage Plan’ button. This takes the user to an interactive spreadsheet in which the user needs to input the number of pipes to be loaded in each bay/tiers
Step 6: Run the transportation analysis for the vessel using the ‘Run Transportation Analysis’ button. The spreadsheet for transportation analysis has the following calculations
6.1 Calculation of motions and forces on pipe bays. This needs the user to input the locations of centre of gravity of different Bays
6.2 The motion forces can be calculated by the software, or the user can input the accelerations if the accelerations have been evaluated in another software. This is done by selecting the appropriate option

6.3 If the user selects ‘use Calculator’ then the maximum roll and pitch angles are obtained from DNV Rules DNV-ST-N001 and the accelerations are computed using basic physical formulations

6.4 If the user selects ‘Input Manually’ then the user needs to input both motion amplitudes (roll/pitch angle) and the accelerations

6.5 The user also needs to input the static angle of trim of the ship (obtained from stability analysis of the vessel done by the vessel crew/loading software)

6.6 Once all inputs are done, the ‘Motion and Forces’ sheet calculates the following
Pipe overturning and sliding check
Evaluation of pipe lashings’ suitability
Check of stanchion/stopper strength (currently only limited to H/I-beam stanchion/stopper)
Deck Strength assessment
Dunnage Crushing check
Step 7: Once the motion and strength assessment are done, the next is the design of lashing-eyes. This is done in the ‘Pad-eye design’ worksheet. The user needs to input the dimensions of the pad-eye for the sheet to evaluate its strength
Step 8: If the vessel is a Barge being towed by a tug, then the next step is to calculate the required bollard pull. This is done in the worksheet ‘Bollard Pull’. The user needs to input the tug properties, environment etc
The worksheet automatically calculates windage area of pipes and gives an assessment of the required bollard pull. This can be helpful in selecting the right sized tug
Step 9: Printing the report. The entire report can be printed using the ‘Print Report’ button on the homepage. This creates a detailed PDF report of all calculations, which can be submitted to MWS for review

Coordinate system:
The following coordinate system has to be followed in using the app
Origin at midship longitudinally, centerline transversely, and baseline vertically
X-axis – positive forward, negative aft
Y-axis – positive starboard, negative port
Z-axis – positive up

Limitations
2. Limited to only loading of pipes on deck, and not in holds
3. It doesn’t cover the cases in which pipes are stacked on bridges between two bays (see fig on right)
4. Only for nested stacking of pipes
5. Stability of the vessel is not covered, it needs to be carried out by the vessel crew by using a standard software. Our app ShipSafe can be used for the same

References
1. DNVGL-ST-N001
2. DNVGL-RP-H103
3. Roark’s formulas for Stress and Strain

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