Large Fishing Vessel Inspection Regulations (C.R.C., c. 1435)
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Regulations are current to 2024-11-26 and last amended on 2023-02-21. Previous Versions
SCHEDULE II(s. 20)
Normal Hatch Covers
Fitted Athwartship or Fore-and-Aft
| Unsupported length in Millimetres | Thickness in Millimetres | Landing (on coamings) in Millimetres |
|---|---|---|
| 915 | 38 | 38 |
| 1065 | 44 | 38 |
| 1220 | 50 | 50 |
| 1370 | 57 | 50 |
| 1525 | 63 | 50 |
| 1675 | 67 | 65 |
| 1830 | 70 | 65 |
Spans in excess of 1830 mm to be fitted with hatch beam or fore-and-after.
Wooden Hatch Beams and Fore-and-afters of Rectangular Cross Section
The scantlings of rectangular cross section hatch beams or fore-and-afters, exclusive of tongue (if fitted), is obtained from the formula:
(B× D2) / 98322 = (S × L2) / 113
where
- B =
- breadth of beam or fore-and-after, in millimetres
- D =
- depth of beam or fore-and-after, in millimetres
- S =
- spacing of beams or fore-and-afters, in millimetres
- L =
- length of unsupported span, in metres.
The following table shows size of wooden hatch beams or fore-and-afters in accordance with the above formula, for hatch openings up to 3050 mm × 3660 mm:
| Size of Hatch Opening in Millimetres | Size of Beam Fore-and-after at Centre in Millimetres |
|---|---|
| 1980 × 2135 | 125 × 180 (180 vertical) |
| 2135 × 2135 | 140 × 180 (180 vertical) |
| 2135 × 2440 | 140 × 205 (205 vertical) |
| 2135 × 2745 | 150 × 215 (215 vertical) |
| 2440 × 2745 | 150 × 230 (230 vertical) |
| 2440 × 3050 | 180 × 240 (240 vertical) |
| 2745 × 2745 | 180 × 230 (230 vertical) |
| 2745 × 3050 | 180 × 255 (255 vertical) |
| 3050 × 3050 | 180 × 265 (265 vertical) |
| 3050 × 3355 | 190 × 280 (280 vertical) |
| 3050 × 3660 | 190 × 305 (305 vertical) |
The minimum bearing required at the ends of hatch beams or fore-and-afters is 75 mm.
Cambered Type Hatch Covers
Fitted Fore-and-Aft Only (in Sections)
| Length of Section in Millimetres | Stiffener Spacing in Millimetres | Size of Stiffeners Sided × Moulded in Millimetres | Cover Thickness in Millimetres | Landing (on coaming) Millimetres |
|---|---|---|---|---|
| 915 | 460 | 40 × 50 | 25 | 40 |
| 1065 | 535 | 40 × 55 | 30 | 40 |
| 1220 | 610 | 45 × 65 | 30 | 50 |
| 1370 | 685 | 45 × 70 | 35 | 50 |
| 1525 | 760 | 45 × 75 | 40 | 50 |
| 1675 | 560 | 50 × 80 | 40 | 65 |
| 1830 | 610 | 50 × 90 | 45 | 65 |
Hatch Coamings
| Maximum Length of Coaming Side or End in Millimetres | Height of Coamings Above Top of Deck in Millimetres | Thickness of Coaming at Deck in Millimetres | |
|---|---|---|---|
| Wood | Steel | ||
| 915 | 305 | 75 | 6 |
| 380 | 75 | 6 | |
| 455 | 75 | 6 | |
| 1220 | 305 | 75 | 6 |
| 380 | 75 | 6 | |
| 455 | 75 | 6 | |
| 1525 | 305 | 75 | 6 |
| 380 | 80 | 6 | |
| 455 | 90 | 6 | |
| 1830 | 305 | 75 | 6 |
| 380 | 80 | 6 | |
| 455 | 90 | 6 | |
| 530 | 95 | 6 | |
| 610 | 100 | 6 | |
| 2135 | 305 | 75 | 6 |
| 380 | 80 | 6 | |
| 455 | 90 | 8 | |
| 530 | 95 | 8 | |
| 610 | 100 | 8 | |
| 2440 | 305 | 80 | 8 |
| 380 | 90 | 8 | |
| 455 | 95 | 8 | |
| 530 | 100 | 8 | |
| 610 | 105 | 8 | |
| 2745 | 305 | 100 | 8 |
| 380 | 105 | 8 | |
| 455 | 115 | 8 | |
| 530 | 120 | 10 | |
| 610 | 125 | 10 | |
| 3050 | 305 | 140 | 10 |
| 380 | 145 | 10 | |
| 455 | 150 | 10 | |
| 530 | 160 | 10 | |
| 610 | 165 | 10 | |
For hatches with coamings longer than 3050 mm special consideration will be given.
Half beams in way of hatches, hatch end beams, carlings, hanging knees, lodging knees and pillars to be of ample strength and suitably arranged.
- SOR/80-249, s. 25
- Date modified: