Dear Colleagues: Could you please assist me with the difference between the GM Solid and GM Fluid? I just received an email from my HO requesting keep the differences between them near to “0”…Is my first time that I have listened someting like that. Many thanks in advance.

GM (solid) = (KM – KG) GM (fluid )= GM (solid) – FSC FSC = Free Surface Correction With a tank with dimensions L and B FSC = (i di/ W)= (LB^3 x di)/ (12 x W ) With an empty tank the FSC = 0 which means: GM (solid )= GM (fluid) I hope that HO do not want you to sail with an empty fuel tank…

[image] omasato71: Is my first time that I have listened someting like that. you mean you have never encountered the requirement to maintain all bunker tanks either full or empty except for no more than two which may be left slack? that is a standard as old as ships carrying oil for fuel!

I wonder what the interest of the office boys is in this matter. Normally speaking I would say to them please go…well, OK. Unless they do the stability calculations ashore and they know things. The only reason I can think of is that the initial GM is almost near the legal limit of 0.15 m and that w…

I’ve never calculated stability using the terms GM Solid and GM Fluid. We calculate GM then correct for free surface to get GoM, corrected GM. Given that the OP is unfamiliar with the terms as well I’d guess that it’s a burst of static from the office. The fix is to turn the squelch up a bit.

Yes that is probably the cure. It is a somewhat strange request from the office and I am puzzled for the reason why they should ask this. Maybe somebody fresh from the academy showing off…:slightly_smiling_face:

The thing is that aboard ship a single requirements can’t be added without compromise elsewhere. In any case the procedures should be changed rather then a single message. Things are done in accordance with the GM, stress requirements in the stability book and operational requirements such as draf…

I’ve noticed that many ships have both GM(s) and GM(f) in their stability printout. [image]

This was already mentioned above: GM (solid) = (KM – KG) GM (fluid )= GM (solid) – FSC FSC = Free Surface Correction The values in your table meet the requirements of these formulas.

Difference between GM Solid & GM Fluid

Professional Mariner Forum

Kennebec_Captain March 12, 2018, 6:19pm 2

Take a look at this: Stability Help

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Difference between GM Solid & GM Fluid

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