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Merchant Shipping (Safety and Load Line Conventions) Act 1932

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This is the original version (as it was originally enacted).

Hatchway Beams and Fore-and-Afters

Where wood hatchway covers are fitted the hatchway beams and fore-and-afters are to be of the scantlings and spacing given in Table 1 where coamings 24 inches high are required, and as given in Table 2 where coamings 18 inches high are required. Angle bar mountings on the upper edge are to extend continuously for the full length of each beam. Wood fore-and-afters are to be steel shod at all bearing surfaces. Table 1 (Coamings 24 inches in height.) Hatchway Beams and Fore-and-Afters for Ships 200 feet or more in length.(1)Hatchway Beams.

Breadth of Hatchway.Mounting.Beams with Fore-and-Afters.Beams without Fore-and-Afters.
Spacing Centre to Centre.Spacing Centre to Centre.
6'0'8'0'10'0'4'0'5'0'
ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.
10' 0"3 x3 x.40A11 x.30P12 x.32P14 x.34p9 x.46Bp10 x.50Bp
12' 0"3 x3 x.40A12 x.32P14 x.34p17 x.36p11 x.50Bp12 x.50Bp
14' 0"3 x3 x.42A14 x.34P17 x.36pP20 x.38p12 x.50Bp12 x.32p
16' 0"3x3 x.42A16 x.36P19 x.38P22 x.38P12 x.32P14 x.34p
18' 0'4 x3 x.44A18 x.36P21 x.38P25 x.40P14 x.34p16 x.36p
20' 0"4 x3 x.44A20 x.38P24 x.40P28 x.42p15 x.34p18 x.36p
22' 0"4 x3 x.46A22 x.38P26 x.42P30 x.44P16 x.36P19 x.36P
24' 0"5 x3 x.46A23 x.40P28 x.42P32 x.44P17 x.36P20 x.38p
26' 0"5 x3 x.48A24 x.40P29 x.42P34 x.46P18 x.36P21 x.38p
28' 0"6 x3 x.50A25 x.40P31 x.44P36 x.48P19 x.38P22 x.38p
30' 0"6 x3 x.52A26 x.42P32 x.44P38 x.48P20 x.38P23 x.40P

Fore-And -Afters

Length of Fore-and-Afters.Mounting.Bulb Plate. Centre Fore-and-Afters.Bulb Angle. Side Fore-and-Afters.
Spacing Centre to Centre.Spacing Centre to Centre.
3'0"4'0"5'0"3'0"4'0"5'0"
ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.
6' 0"2 ½ x2 ½ x.366 x.366 ½ x.387 x.386 x3 x.386 ½ x3 ½ x.387 x3 ½ x.38
8' 0"2 ½ x2 ½ x.387 x.428 x.449 x.447 x3 ½ x.428 x3 x.449 x3 ½ x.44
10' 0"2 ½ x2 ½ x.408 x.509 ½ x.5011 x.508 x3 ½ x.509 ½ x3 ½ x.5011 x3 ½ x.50
Wood Centre Fore-and-Afters.Wood Side Fore-and-Afters.
Spacing Centre to Centre.Spacing Centre to Centre.
3'0"4'0"5'0"0"3'0"4'0"5'0"
DBDBBDBDBDB
ins.ins.ins.ins.insins.ins.insins.ins.ins.ins.
6' 0"5 ½7676 ½75 ½5 ½666 ½6
8' 0"6 ½77 ½7876 ½6 ½7 ½787
10' 0"878 ½899878 ½899

A = Plain angle. BP = Bulb plate. P = Plate. D = Depth. B = Breadth. Depths for hatchway beams are at the middle of the length and are measured from the top mounting to the lower edge. Depths for fore-and-afters are measured from the under side of the hatch covers to the lower edge. Sizes for intermediate lengths and spacing are obtained by interpolation. Where plates are specified, two angles, of the size given for mountings, are to be fitted at the upper and at the lower part of the beam. Where bulb plates are specified, two angles, of the size given for mountings, are to be fitted at the upper part of the beam or fore-and-after. Where bulb angles are specified, one angle, of the size given for mountings, is to be fitted at the upper part of the section. Where the specified flanges of an angle are of different dimensions, the larger flange is to be horizontal.

Table 2 (Coamings 18 inches in height.) Hatchway Beams and Fore-and-Afters for Ships 200 feet or more in length.(2)Hatchway Beams.

Breadth of Hatchway.Mounting.Beams with Fore-and-Afters.Beams without Fore-and-Afters.
Spacing Centre to Centre.Spacing Centre to Centre.
6'0"8"0"10'0"4'0"5"0"
ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.
10' 0"3 x3 x.40A9 ½ x.46BP10 ½ x.50BP11 ½ x.52Bp8 x.40Bp9 x.44Bp
12' 0"3 x3 x.40A11 x.50BP11 x.30P13 x.34p9 x.46BP10 x.50BP
14' 0"3 x3 x.42A11 x.30P13 x.32P15 x.34p10 x.50BP11 ½ x.50BP
16' 0"3 ½ x3 x.42A12 x.32P15 x.34p17 x.36P11 x.30P11 x.30P
18' 0"4 x3 x.44A14 x.34p17 x.36P19 x.38P11 x.30P12 x.32P
20' 0"4 x3 x.44A16x.36P19 x.38P21 x.38P12 x.32P13 x.34p
22' 0"4 ½ x3 x.46A17 x.36P20 x.38P23 x.40P12 ½ x.32P14 x.34p
24' 0"5 x3 ½ x.46A18 x.36P21 x.38P25 x.40P13 x.34p14 ½ x.34p
26' 0"5 ½ x3 ½ x.48A19 x.38P22 x.38P26 x.42P13 ½ x.34p15 x.34p
28' 0"6 x3 ½ x.50A20 x.38P23 x.40P27 x.42P14 x.34p16 x.36P
30' 0"6 x3 ½ x.52A21 x.38P24 x.40P28 x.42P15 x.34p17 x.36P

Fore-and-Afters

Length of Fore-and-Afters.Mounting.Bulb Plate. Centre Fore-and-Afters.Bulb Angle. Side Fore-and-Afters.
Spacing Centre to Centre.Spacing Centre to Centre.
3'0"4'0"5'0"3'0"4'0"5'0"
ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.ins.
6' 0"2 ½ x2 ½ x.365 x.345 ½ x.346 x.365 x3 x.345½ x3 x.346 x3 x.36
8' 0"2 ½ x2 ½ x.386 x.387 x.407 ½ x.426 x3 x.387x7 x.407 ½ x3 ½ x.42
10' 0"2 ½ x2 ½ x.407 x.448 x.469 x.507 x3 x.448 x3 ½ x.569 x3 ½ x.50
Wood Centre Fore-and-Afters.Wood Side Fore-and-Afters.
Spacing Centre to Centre.Spacing Centre to Centre.
3'0"4'0"5'0"0"3'0"4'0"5'0"
DBDBBDBDBDB
ins.ins.ins.ins.insins.ins.insins.ins.ins.ins.
6' 0"575 ½767555 ½565
8' 0"676 ½777656 ½676
10' 0"777 ½787767 ½787

A = Plain angle. BP = Bulb plate. P = Plate. D = Depth. B—Breadth. Depths for hatchway beams are at the middle of the length and are measured from the top mounting to the lower edge. Depths for fore-and-afters are measured from the under side of the hatch covers to the lower edge. Sizes for intermediate lengths and spacing are obtained by interpolation. Where plates are specified, two angles, of the sizes given for mountings, are to be fitted at the upper and at the lower part of the beam. Where bulb plates are specified, two angles, of the size given for mountings, are to be fitted at the upper part of the beam or fore-and-after. Where bulb angles are specified, one angle, of the size given for mountings, is to be fitted at the upper part of the section. Where the specified flanges of an angle are of different dimensions, the larger flange is to be horizontal.

Rule XII

(1)

4 In ships not exceeding 100 feet in length, the depths of beams which are formed of plates and angles may be 60 per cent. of the depths given above; the depths of beams and steel fore-and-afters formed of bulb angle or bulb plate section may be 80 per cent. of the depths given above; the thickness of plates, bulb angles and bulb plates should correspond to the thickness tabulated for the reduced depths with a minimum thickness of -30 inch; the depths and breadths of wood fore-and-afters may be 80 per cent. of those given in the tables for side fore-and-afters, but the centre fore-and-afters must be not less than 6 ½ inches wide. In ships between 100 feet and 200 feet in length, the sizes of the beams and fore-and-afters are to be determined by linear interpolation.

(2)

5 In ships not exceeding 100 feet in length, the depths of beams which are formed of plates and angles may be 60 per cent. of the depths given above; the depths of beams and steel fore-and-afters formed of bulb angle or bulb plate section may be 80 per cent. of the depths given above; the thickness of plates, bulb angles and bulb plates should correspond to the thickness tabulated for the reduced depths with a minimum thickness of -30 inch; .the depths and breadths of wood fore-and-afters may be 80 per cent. of those given in the tables for side fore-and-afters, but the centre fore-and-afters must be not less than 6J inches wide. In ships between 100 feet and 20C feet in length, the sizes of the beams and fore-and-afters are to be determined by linear interpolation.

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