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Hawaii Marine Templates
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Barge & Pontoon Trim, List & GM Stability Sheet (English Units)

Description: This spreadsheet automatically computes trim, list, forward port and starboard drafts, aft port and starboard drafts, GMs (metacentric heights: transverse and longitudinal).  It also computes total weight, all centroids of total weight.   This calculative method applies to simple box barge or pontoon.   If forward and aft rakes are present their hydrostatic effects are conservatively excluded.  This spreadsheet is set up to handle deck cargo and it can also compute the stability and trim effects of a deck crane with it's hook load.

Electronic Document Type:  Microsoft Excel Workbook         

Number of Sheets in this Spreadsheet: Eight (8)

Inputs:  

  • The Barge Ship light weight and centroids

  • The following is required for each item on board:

    • Weights and centroid information for deck cargo on board, if present. 

    • Weights of crane and hook load if present.

  • The following are also normally required:

    • Select the weight density of water, whether it is salt or fresh, select appropriate value, values given.

    • The barge dimensional characteristics: LOA, forward rake length, aft rake length, beam, depth.

    • The deck crane and hook load dimensional characteristics:

      • height of hook load (above crane bottom)

      • distance from barge end to center of crane rotation

      • crane radius

      • Longitudinal distance from rotation axis of crane to crane center of gravity (for boom, cab, tracks, counterweights, etc. every component of crane except hook load).  This distance is zero if crane boom is orientated athwartship.  This value is usually close to zero and it can be left at zero for reasonably approximate results.

      • Transverse distance from rotation axis of crane to crane center of gravity (for boom, cab, tracks, counterweights, etc. every component of crane except hook load).  This distance is zero if crane boom is longitudinally oriented.  This value is usually close to zero and it can be left at zero for reasonably approximate results.

      • Thickness of timber matt and steel plate if present.  These items often placed on the deck just below crane tracks to distribute loading on barge.

    • Maximum Allowable KG, this is an optional input on Trim, List & Stability Sheet.  If this value is known for the given configuration a Margin can be calculated.  If unknown, set Maximum Allowable KG equal to zero and the spreadsheet will automatically set the Margin value to "Not Available."  Note the variable KG is also represented as the variable VCG.

    Outputs:  

    • The total weight and centroids of the vessel in the condition being evaluated:
      W, vcg, lcg and tcg 

    • The following Curves of Form data:  Draft, LCB, LCF, KMT and KML

    • The trim and list present, the trim and list angles, the centerline, port and starboard forward drafts, the centerline, port and starboard after drafts, longitudinal and transverse GMs (metacentric heights).

    • Profile of port and starboard waterlines, not to scale.  Besides a quick reference for waterline locations, this profile is also used to quickly determine if the hull bottom has emerged out of the water or if the barge deck has submerged. 

    Suggested Reading:

    Terms: Prior to purchase, read our End User License Terms.

    Important Notice to European Union Buyers: Due to changes in international law, we no longer accept purchases from any individuals located within an EU country.  However, businesses located within the EU are allowed to make purchases, provided that they make the VAT payments for any imported items purchased electronically.  These EU businesses must specify their VAT number in the memo section on the Paypal payment pages.  These changes are effective as of July 1, 2008, and were modified for EU businesses on April 9, 2010.  

    Download Now: Click one of the following buttons to pay.  After payment you will be taken directly to the download page.

    Minimum System Requirements: Windows 95/98/NT/2000/XP/Vista/Windows 7 & 8

    Sample: A sample document is shown below.