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- On the Voyage Estimate menu, click Auto Calculate by Max Lift Qty. The following information is used:
- From the Vessel form:
- Capacity fields vary with Type Code, for example:
- Type Code T (Tanker): Capacity M3 or Capacity Bbl
- Type Code B (Bulk): Capacity (Bale) or Capacity (Grain)
- Vessel DWT (taking into account the season and the salinity of the berth)
- Constants and Safety Margins
- Capacity fields vary with Type Code, for example:
- Bunkers ROB
- Cargo Name
- Cargo Class Dry or Unspecified: Stowage Factor (M3/MT or Ft3/MT)
- Cargo Class Liquid: Density (API/Specific Gravity)
- Cargo Class Dry: The Capacity Basis default is Grain, but you can change it on the Cargo Name form.
- From the Vessel form:
- Quantities appear in Voyage Estimate Details view:
- On the Draft/Restrictions tab, in the Cargo and L/D Qty fields.
- In the Cargoes grid, in the CP Qty field, depending on configuration flags.
- You can override the calculated lift value.
To recalculate, clear the field and then press Enter. The new value appears blue.
To see the inputs to the calculation, on the Draft/Restrictions tab, hover over the value in the Max Lift field.
Max Lift Calculation
In determining the Max Lift, three possibly restricting quantities are calculated:
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If the result from the Max Lift calculation is higher than the Max Available Deadweight, then the Max Lift is the Deadweight itself (the maximum the ship can lift).
Max Available Deadweight
Max Available Deadweight = Vessel Deadweight − Bunkers and Constants
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Unlike the 68714792 calculation, this portion of the Max Lift Calculation does not account for possible differences in salinity between the baseline used and the itinerary.
Max Deadweight Given Cubic Restrictions
For Gas Carriers and Tankers:
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- For LNG Vessels.
- If there are different cargo densities specified in the itinerary.
- If Capacity or Specific Gravity/Stowage Factor is missing.
Max Deadweight Given Draft Restrictions
This calculation happens in one of two ways, depending on whether we can determine the deadweight from the Deadweight Table in the DWT/Draft tab of the Vessel form.
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This calculation is only performed when we have a draft specified on an itinerary line.
Calculation Based on Deadweight Table
Notes
The Max Deadweight Given Draft Restrictions are not determined if:
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Max Deadweight Given Draft Restrictions = 64,616.3 MT - 200 MT = 64,416.3 MT
Calculation Based on TPC
If we fail to get a deadweight from the Deadweight Table calculation (for one of the reasons given under Notes in the relevant section), we calculate the max deadweight based on the vessel’s TPC. The equation for this method depends on whether the salinity on the itinerary line matches the baseline salinity we are using for our Max Lift Calculation (see the 68714792 -> Deadweight section for information on baselines).
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