Title: Instructions to Masters of Vessels Loading Grain in Canada
Number:
TP
215
E
Date: 1976
Details: Marine Safety Directorate
This
TP
will be updated to incorporate recent changes which came into force under the Canada Shipping Act, 2001. See List of Changes
Calculation of Stability for a Vessel Loading Bulk Grain in Accordance with Canadian Regulations
Captain:
You are required to complete a stability calculation prior to the commencement of loading. This is to indicate your vessel's worst condition during the forthcoming voyage. The calculation should be made on this form and presented to the Port Warden before the vessel can be issued with a Certificate of Readiness to Load. If there are any subsequent changes to the original stowage plan, (tonnages, commodities or stowage factors), you should prepare a corrected plan for the Port Warden's approval.
The manner in which this calculation is made will depend upon
- Your type of vessel
- The geographical position of your loading port, and
- The type of grain stability information with which your vessel has been provided.
TYPE 1 CALCULATION (5° ANGLE OF HEEL)
If your vessel is a bulk carrier and an "existing ship" under the provisions of IMCO Resolution A264 (VIII) Part B, Sec. V(B), you are required to prove that your vessel's angle of heel, if grain shifts, will not exceed 5°. Your stability information will indicate if your vessel is of this type and if so you should complete only Tables I, II, III, IV, and VII A.
If your vessel has to meet the provisions of Regulation 4 of the above Resolution, i.e. Maximum Values of (a) Angle of Heel 12°, and Minimum Values of (b) Residual Stability 0.075 metre radians and (c) GM 0.30M, you should complete the form by one of the following methods.
TYPE 2 CALCULATION (ALLOWABLE *UPSETTING MOMENTS, 12° ANGLE OF HEEL)
If your vessel's grain stability information contains a table of Allowable Upsetting Moments complete only tables I, II, III, IV, V, and VI.
TYPE 3 CALCULATION (WITHOUT ALLOWABLE UPSETTING MOMENTS, 12° ANGLE OF HEEL) ABBR.
If you are not provided with a table of Allowable Upsetting Moments complete only Tables I, II, III, IV, VIIB and VIII.
If however the GZ curve depicted in your grain stability information booklet that is closest to your proposed loading condition is not of a normal configuration, or the maximum GZ value of such curve occurs before 40°, then you should complete:
TYPE 4 CALCULATION (WITHOUT ALLOWABLE UPSETTING MOMENTS, 12° ANGLE OF HEEL) FULL
In this case complete tables I, II, III, IV, V, VIIB and IX.
TYPE 5 CALCULATION (5° ANGLE OF HEEL) TANKERS
If your vessel is a tanker all tanks except two (two wings or two centres) must be trimmed full or you will be required to meet the conditions described in TYPE I above (5° Angle of Heel).
Your Administration may have provided you with a statement stating that your vessel at all times meets the required conditions for draft and initial GM values and in this case no calculation is necessary. Alternatively you may have information enabling you to complete a TYPE I Calculation. If not you should complete only Tables I, II, III, and VIIC.
TYPE 6 CALCULATION (REDUCED STABILITY CRITERIA, SHELTERED WATERS)
If your vessel is loading at more than one port within sheltered waters you may not be able to meet fully the requirements laid down in your stability documents whilst in transit between such ports. In this instance you may take advantage of a relaxation of such requirements whilst in transit between ports. In this case you should complete tables I, II, III and X.
If you meet the requirements of Table X your vessel will not in fact list more than 15° if grain in all slack holds shifts through an angle with the horizontal of 12°, nor will your available freeboard be immersed by more than 50%. Before taking advantage of this provision you are advised to study Section 11 of the Canadian Grain Regulations.
If it is decided to take advantage of this relaxation, it should be borne in mind that your vessel will have to comply fully with the Regulations prior to departure from sheltered waters.
OTHER CONDITIONS
Vessels having onboard documents requiring other than the criteria described above, or no documents, should consult with the Port Warden for further instructions.
* It is possible that the term "heeling moment" is used in some stability booklets. This term is an alternative for "upsetting moment" and the two are to be taken to mean the same.
LIST OF CHANGES
- The Canadian Regulations referred to in this notice are no longer the "Grain Regulations", these were repealed and these provisions may now be found in the "Cargo, Fumigation and Tackle Regulations", Division (3).
- The provisions of the regulations such as verifications of calculations, corrections, Certificates of Readiness to Load, etc are verified by Transport Canada Marine Safety Inspectors or by a Port Warden.
- For Type 6 Calculations (reduced stability criteria, sheltered waters), this now applies to "certain waters" and before taking advantage of this provision you are advised to study Section 125 of the Cargo Fumigation and Tackle Regulations.
- Grain Stability Form / PDF File form # : 82-0579