✨ Marine Safety Regulations
Oct. 12.] THE NEW ZEALAND GAZETTE. 3261
In ships with a superstructure of standard height which extends over the whole length of the freeboard deck, the sheer is measured at the superstructure deck; where the height exceeds the standard, the sheer may be considered in relation to the standard height.
Where a superstructure is intact or access openings in its enclosing bulkheads are fitted with Class 1 closing appliances, and the superstructure deck has at least the same sheer as the exposed freeboard deck, the sheer of the enclosed portion of the freeboard deck is not taken into account.
Rule LV.—Standard Sheer Profile.
The ordinates (in inches) of the standard sheer profile are given in the following Table, where L is the number of feet in the length of the ship:—
| Station. | Ordinate. | Factor. |
|---|---|---|
| A.P. .. .. | 0·1 L + 10 | 1 |
| 1/6 L from A.P. | 0·0445 L + 4·45 | 4 |
| 1/3 L from A.P. | 0·011 L + 1·1 | 2 |
| Amidships .. | 0 | 4 |
| 1/3 L from F.P. | 0·022 L + 2·2 | 2 |
| 1/6 L from F.P. | 0·089 L + 8·9 | 4 |
| F.P. .. .. | 0·2 L + 20 | 1 |
A.P. = After end of Summer load water-line. F.P. = Fore end of Summer load water-line.
Rule LVI.—Measurement of Variations from Standard Sheer Profile.
Where the sheer profile differs from the standard, the seven ordinates of each profile are multiplied by the appropriate factors given in the table of ordinates. The difference between the sums of the respective products, divided by 18, measures the deficiency or excess of sheer. Where the after half of the sheer profile is greater than the standard and the forward half is less than the standard, no credit is allowed for the part in excess and the deficiency only is measured.
Where the forward half of the sheer profile exceeds the standard, and the after portion of the sheer profile is not less than 75 per cent. of the standard, credit is allowed for the part in excess; where the after part is less than 50 per cent. of the standard no credit is given for the excess sheer forward. Where the after sheer is between 50 per cent. and 75 per cent. of the standard, intermediate allowances may be granted for excess sheer forward.
Rule LVII.—Correction for Variations from Standard Sheer Profile.
The correction for sheer is the deficiency or excess of sheer (see Rule LVI), multiplied by 0·75 S/2L, where S is the total length of superstructure, as defined in Rule XL.
Rule LVIII.—Addition for Deficiency in Sheer.
Where the sheer is less than the standard, the correction for deficiency in sheer (see Rule LVII) is added to the freeboard.
Rule LIX.—Deduction for Excess Sheer.
In flush deck ships and in ships when an enclosed superstructure covers 0·1 L before and 0·1 L abaft amidships, the correction for excess of sheer (see Rule LVII) is deducted from the freeboard; in ships with detached superstructures where no enclosed superstructure covers amidships, no deduction is made from the freeboard; where an enclosed superstructure covers less than 0·1 L before and 0·1 L abaft amidships, the deduction is obtained by interpolation. The maximum deduction for excess sheer is 1½ inches at 100 feet and increases at the rate of 1½ inches for each additional 100 feet in the length of the ship.
Round of Beam.
Rule LX.—Standard Round of Beam.
The standard round of beam of the freeboard deck is one-fiftieth of the breadth of the ship.
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VUW Te Waharoa —
NZ Gazette 1934, No 77
NZLII —
NZ Gazette 1934, No 77
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Rules for determining Maximum Load Lines of Merchant Ships
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🚂 Transport & CommunicationsLoad Lines, Merchant Ships, Marine Safety, Regulations, Superstructure, Freeboard Deck, Sheer Profile, Round of Beam