Large Fishing Vessel Inspection Regulations (C.R.C., c. 1435)

Regulations are current to 2019-07-01 and last amended on 2017-02-03. Previous Versions

SCHEDULE II(s. 20)

Normal Hatch Covers

Fitted Athwartship or Fore-and-Aft

Unsupported length in MillimetresThickness in MillimetresLanding (on coamings) in Millimetres
9153838
10654438
12205050
13705750
15256350
16756765
18307065

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 MillimetresSize of Beam Fore-and-after at Centre in Millimetres
1980 × 2135125 × 180 (180 vertical)
2135 × 2135140 × 180 (180 vertical)
2135 × 2440140 × 205 (205 vertical)
2135 × 2745150 × 215 (215 vertical)
2440 × 2745150 × 230 (230 vertical)
2440 × 3050180 × 240 (240 vertical)
2745 × 2745180 × 230 (230 vertical)
2745 × 3050180 × 255 (255 vertical)
3050 × 3050180 × 265 (265 vertical)
3050 × 3355190 × 280 (280 vertical)
3050 × 3660190 × 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 MillimetresStiffener Spacing in MillimetresSize of Stiffeners Sided × Moulded in MillimetresCover Thickness in MillimetresLanding (on coaming) Millimetres
91546040 × 502540
106553540 × 553040
122061045 × 653050
137068545 × 703550
152576045 × 754050
167556050 × 804065
183061050 × 904565

Hatch Coamings

Maximum Length of Coaming Side or End in MillimetresHeight of Coamings Above Top of Deck in MillimetresThickness of Coaming at Deck in Millimetres
WoodSteel
915305756
380756
455756
1220305756
380756
455756
1525305756
380806
455906
1830305756
380806
455906
530956
6101006
2135305756
380806
455908
530958
6101008
2440305808
380908
455958
5301008
6101058
27453051008
3801058
4551158
53012010
61012510
305030514010
38014510
45515010
53016010
61016510

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
 
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