Name of Vessel ------------------- Documentation No.------------------ Date ------------ |
Owner/Representative ------------------------------------- Inspector -------------------- |
Location----------------------Wind: Relative Direction------------------Vel --------- kts |
Mooring Arrangement ------------------------------------------------------------------ |
Route --------------------------- Check One Exposed.. Coastal Protected |
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Indicate on above Sketch | Indicate on above Sketch |
1) Profile of sheer line. | 1) Round or vee bottom |
2) Length overall (L) | 2) Maximum beam (B) to outside of shell; greater or equal to (Bf). |
3) Station for measuring Reference Freeboard (f) above load waterline (LWL), located in way of least freeboard or at a point ¾ (L) from the stem if the least freeboard is aft of this point. |
3) Maximum beam (Bp) accessible to passengers. |
4) Maximum beam (Bf) on deck in way of Reference Station. |
5) Reference Freeboard (f), height of sheer line above the LWL, in way of Reference Station. |
4) Freeboard at bow |
5) Freeboard at stern*. | 6) Height of weather deck (including cockpit deck, if any) above load waterline in way of Reference Station. |
All of the above measurements are to be taken in the loaded condition without list (III/8.6). Measurements for (L), (B), and (Bf) are to exclude rub rails. If the vessel carries passengers on diving excursions, the total weight of the diving gear must be included in the loaded condition. If the vessel has a cockpit or well deck, show same by dotted line on the above sketches and indicate length (/). |
*Freeboard shall be the distance from the sheer line to the load waterline. The sheer line shall be taken as the intersection of the side shell with the weather deck. Where calculations require “gunwale top” to be used, the following applied: For a cockpit vessel, the gunwale top shall be measured along an imaginary extension of the sheer line in way of the cockpit. For an open boat, the gunwale top shall be considered the sheer line. |
Passengers include the crew. |
(1) TOTAL TEST WEIGHT REQUIRED: |
| × | | = | |
# of Pax | | Wt/Pax | | Total Test WT. (W) |
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Notes: | a) “Test Weight” defines only the weight to be moved during the test. Weights used to represent missing equipment or stores shall be considered part of the “loaded condition.” b) The maximum number of passengers shall not exceed the number computed in accordance with SCV Code II/15. c) Weight per passenger equals 75kg (166 lbs), except that on “protected waters” when passenger loads consists of men, women and children; a weight per passenger of 65kg (143 lbs) may be used. |
(2) DISTRIBUTION OF TEST WEIGHT— |
a) Distribute the test weight fore and aft so as to obtain the normal operating trim. |
b) Arrange the test weight so that its vertical center of gravity (CG) is approximately 76.2cm (30 inches) above deck. |
c) The vertical distribution of the test weight shall be such as to simulate the most unfavourable vertical CG likely to occur in service. On vessels having one upper deck above the main deck available to passengers, the vertical weight distribution shall not be less severe than the following— |
Total test weight (w) | | = | |
Passenger capacity of upper deck— |
--------------- | × | -------------- | × 1.33 | = | -------------- | Weight on Upper Deck |
# of Pax | Wt/Pax |
| | | | |
| | | | | | -------------- | Weight on Main Deck |
(3) WIND HEEL CALCULATION— |
a) With the vessel in the loaded condition, block off the profile of the vessel into rectangles using vertical lines starting at the load waterline, as shown below. Include passenger railings, canopies and spotting towers. |
b) Measure, on the vessel, the length (L) and height (V) of each rectangle and enter into the table on Sheet 3. |
c) Complete the calculations in the table, add the products in the last column and enter the sum in section (4)(b). Multiply this sum by the appropriate (P) value to obtain the Wind Heeling Moment (Mw) in section (4)(b) on page 3. |
(3) continued | | - Profile - | | |
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Load Waterline | Scale: 1 square = ---------------------- |
- Calculations - |
Section | L | V | A (L x V) | H (0.5V) | A x H |
A | | | | | |
B | | | | | |
C | | | | | |
D | | | | | |
E | | | | | |
F | | | | | |
G | | | | | |
| | | Sum (AxH) | |
(4) REQUIRED HEELING MOMENT— |
Apply ( a ) or ( b), whichever is greater: |
(a) Passenger Heeling Moment (Mp) = (W X Bp)/6 = |
(--------------------------- | × | --------------------- | )/6 = | ---------- |
Total Test Wt. (W) | | Max Beam Open to Passengers (Bp) | | |
(b) Wind Heeling Moment (Mw ) = |
--------------------------- | × | ---------------------) | = | --------- |
Wind Pressure (P) | | Sum (A x H) | | |
(5) LOCATION OF IMMERSION MARK (i) ABOVE LOAD WATER- LINE PRIOR TO APPLICATION OF HEELING MOMENT: |
The freeboard measurement (f) shall be taken with the weight required in Step (1) on board. The height of the immersion mark (i) shall be the lesser of the two values provided by (a), (b), (c) or (d) according to vessel type, or (e) for all vessels. The mark (i) shall be placed on the hull above the LWL at the reference station. |
i = | ___________________________ | |
(a) | Flush Deck Type Sailing Vessels (or well deck vessels that operate on protected waters, have non return scuppers, and the reference freeboard is not more than one quarter of the distance from the waterline to the top of the gunwale). Reference freeboard (f) is measured to the top of the weather deck at the side of the vessel. |
| | | = | | |
| | Reference freeboard (f) | | Height of (i) above LWL | |
(b) | Flush Deck Type Vessels (including all well deck vessels except those noted in (a) above) For well deck vessels, freeboard (f) to the lowest deck exposed to the weather must equal or exceed 25.4cm (10 inches) If less than 25.4 cm, use 5(d) Open-boat Type formula |
| | | /2= | | |
| | Reference freeboard (f) | | Height of (i) above LWL | |
(c) | Cockpit Type Vessels | Exposed Waters |
Freeboard to cockpit deck must equal or exceed 25.4cm (10 inches) | |
If less than 25.4cm, use 5 (d) Open – boat Type formula | (i) = f ( 2L-1.5/) |
Length overall ........................................... (L) | |
Length of cockpit ....................................... (/) | 4L |
Reference freeboard .................................. (f) | Coastal or Protected Waters |
(measured to top of gunwale) | (i) = f(2L-/) |
Height of immersion mark above LWL(i) | |
All measurements shall be in metres (feet) | 4L |
(d) | Open-boat Type Vessels |
| Reference freeboard (f) is measured to top of gunwale |
| | | /4= | | |
| | Reference freeboard (f) | | Height of (i) above LWL | |
(e) | All Vessel Types |
To limit the final angle of list to 140 for any type of vessel, the height of the immersion mark (i) shall on no case exceed the value below. If this value is less than that produced by (a), (b), (c) or (d) above, whichever applicable, then this value shall be used for (i). |
| | | /8= | | |
| | Beam at Reference Station | | Max height of (i) above LWL for any type of vessel | |
6) WEIGHT MOVEMENT: |
a) The heeling moment required by section (4) shall be obtained by a transverse movement of the test weights. |
b) The test shall be conducted with all tanks ¾ full, ballast aboard in place, all portlights secured, and any non-return valves or flaps on scuppers or deck drains restrained in the open position. |
c) The vessel shall be fully afloat and all mooring are to be slack during the test. |
d) During the loading and moving of test weights, care should be taken if there is evidence of low stability. This may be assumed to be the case whenever the effect of any added or shifted weight increment is noted to be more than that of the preceding increment of the same size, or when the chine or bilge amidships comes out of the water as a result of the heel. |
e) Care is to be exercised that the vessel is not heeled excessively either due to weight movement or superimposed roll which could cause the test weights to topple or ship's gear to become adrift. |
f) While the vessel is heeled, check for open seams, loose hull fittings, etc., which are not normally immersed and which could cause flooding of the vessel. |
Quality | Weight per Unit | Distance Moved | Moment |
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| Total Heeling Moment | |
(7) HEIGHT OF IMMERSION MARK (I) ABOVE WATER-LINE AFTER WEIGHT MOVEMENT: |
i = ------------------ |
a) If the vessel lists to the immersion mark (i) before the full heeling moment is applied, the test shall be stopped and the vessel fails the test. |
b) When the moment required in section (4) has been developed, measure the resulting height of the immersion mark (i) above the waterline. |
c) If any portlights are found to be near the waterline at the final angle of the list, such portlights on each side shall be permanently closed. |
d) If any scuppers or drains are found to be below the waterline at the final angle of listso as to permit entry of water into the or onto the deck, such openings on each side shall be fitted with automatic non-return valves. |
(8) GENERAL STABILITY INFORMATION (for documentation purposes only) Tankage |
Tank | Capacity | Approximate Location of CG @ 100% Cap. |
| | Aft of Stem | Above Top of Keel |
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Ballast: |
Material | Weight | Approximate Location of CG |
| | Aft of Stem | Above Top of Keel |
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