Artikel 58

As an exception to the general rule laid down in Article 50, but subject to the conditions of Article 51, the space situated between the upper deck and the shelter-deck - commonly called “shelterdeck space” - and other superstructures shall be exempted from inclusion in gross tonnage when they are deemed to be open spaces, in conformity with the following provisions:
I. A space shall be considered to be open for the purpose of tonnage measurement if a bulkhead or covering consists solely of expanded metal or similar grating or of planks with intervals from each other of more than 0.25 foot, or 0.076 metre, in the case of a bulkhead, or more than 0.08 foot, or 0.024 metre, in the case of a covering.1) If such a space is used as a storeroom, workshop, etc., it shall be included in the gross tonnage.
II. (a) Openings in Decks or Coverings. 1. A space shall be considered to be open for the purpose of tonnage measurement when there is an opening in the centre of the deck or covering above such space. The length of this opening shall not be less than 4 feet, or 1.219 metre, and the breadth shall be at least equal to that of the nearest cargo hatch on the same deck or covering.
2. If exemption from inclusion in gross tonnage is claimed for a shelter-deck space or part of it, the distance between the aft side (after coaming) of the deck opening and the aft side of the stern post shall not be less than one-twentieth of the identification length of the ship when the opening is situated aft; or the distance between the fore side (fore coaming) of the deck opening and the fore side of the stem shall not be less than one-fifth of this length if the opening is situated forward.
3. If coamings are fitted, their mean height above the deck or covering shall not exceed 1 foot, or 0.305 metre. Guard-rails, stanchions or sockets around the opening shall be fitted in such a way as to prevent any battening down of the opening. Only portable wooden covers are allowed, and it is permissible to hold such covers in place by lashings beneath of cordage (not steel wires) of hemp or similar material (see Figure 83).
4. Tonnage openings in the deck shall not be fitted under a deck, permanent platform or any other similar structure (see Figure 84).
1. A space shall be considered to be open for the purpose of tonnage measurement when there is an opening in the centre of the deck or covering above such space. The length of this opening shall not be less than 4 feet, or 1.219 metre, and the breadth shall be at least equal to that of the nearest cargo hatch on the same deck or covering.
2. If exemption from inclusion in gross tonnage is claimed for a shelter-deck space or part of it, the distance between the aft side (after coaming) of the deck opening and the aft side of the stern post shall not be less than one-twentieth of the identification length of the ship when the opening is situated aft; or the distance between the fore side (fore coaming) of the deck opening and the fore side of the stem shall not be less than one-fifth of this length if the opening is situated forward.
3. If coamings are fitted, their mean height above the deck or covering shall not exceed 1 foot, or 0.305 metre. Guard-rails, stanchions or sockets around the opening shall be fitted in such a way as to prevent any battening down of the opening. Only portable wooden covers are allowed, and it is permissible to hold such covers in place by lashings beneath of cordage (not steel wires) of hemp or similar material (see Figure 83).
4. Tonnage openings in the deck shall not be fitted under a deck, permanent platform or any other similar structure (see Figure 84).
(b) Openings in the Sides of the Ship or in the Side Bulkheads of a Superstructure. 1. A space shall be considered to be open for the purpose of tonnage measurement when there are one or more openings on both sides in the shell or in the side bulkheads of a superstructure. When there is only one opening in each side, the length shall not be less than 18 feet, or 5.486 metres, and the height shall not be less than 2.5 feet, or 0.762 metre. When there is more than one opening in each side, the height of such openings shall not be less than 2.5 feet, or 0.762 metre, and their total area on each side not less than 60 square feet, or 5.574 square metres. No opening shall have an area of less than 25 square feet, or 2.323 square metres (see Figures 85 and 86).
2. Should there be a well between thwartship bulkheads, the openings in the shell or in the side bulkheads shall have a length of 18 feet, or 5.486 metres, if possible, or not less than three-fourths of the length between the thwartship bulkheads. The height shall not be less than 2.5 feet, or 0.762 metre. The area of the opening on each side should be at least 45 square feet, or 4.181 square metres.
3. All side openings shall be in corresponding positions on both sides of the ship or of the superstructure; they shall not be fitted with any permanent means of closing. The only means allowed for closing side openings are shifting boards, fitted in channel-bars riveted or welded to the shell or to the side bulkheads. Neither the shell or bulkheads at the openings, nor the channel-bars, nor the frames crossing the openings are to be provided with holes, hinges, eyebolts, cleats or any other means which may serve in permanently closing or battening down the openings.
4. Side openings shall not be enclosed by bulkheads or otherwise.
1. A space shall be considered to be open for the purpose of tonnage measurement when there are one or more openings on both sides in the shell or in the side bulkheads of a superstructure. When there is only one opening in each side, the length shall not be less than 18 feet, or 5.486 metres, and the height shall not be less than 2.5 feet, or 0.762 metre. When there is more than one opening in each side, the height of such openings shall not be less than 2.5 feet, or 0.762 metre, and their total area on each side not less than 60 square feet, or 5.574 square metres. No opening shall have an area of less than 25 square feet, or 2.323 square metres (see Figures 85 and 86).
2. Should there be a well between thwartship bulkheads, the openings in the shell or in the side bulkheads shall have a length of 18 feet, or 5.486 metres, if possible, or not less than three-fourths of the length between the thwartship bulkheads. The height shall not be less than 2.5 feet, or 0.762 metre. The area of the opening on each side should be at least 45 square feet, or 4.181 square metres.
3. All side openings shall be in corresponding positions on both sides of the ship or of the superstructure; they shall not be fitted with any permanent means of closing. The only means allowed for closing side openings are shifting boards, fitted in channel-bars riveted or welded to the shell or to the side bulkheads. Neither the shell or bulkheads at the openings, nor the channel-bars, nor the frames crossing the openings are to be provided with holes, hinges, eyebolts, cleats or any other means which may serve in permanently closing or battening down the openings.
4. Side openings shall not be enclosed by bulkheads or otherwise.
(c) Openings in Thwartship Bulkheads. 1. A space shall be considered to be open, for the purpose of tonnage measurement: (i) When there are, on one of the end bulkheads, two tonnage openings, one on each side of the middle plane. If coamings are fitted, their height shall not exceed 2 feet, or 0.610 metre. The height of opening shall in no case be less than 4 feet, or 1.219 metre, and the breadth shall be at least 3 feet, or 0.914 metre;
(ii) When there is, on one of the end bulkheads, one single tonnage opening of at least 5 feet, or 1.524 metre, in height and 4 feet, or 1.219 metre, in breadth, provided that the opening is situated as near as is practicable to the middle plane of the space concerned or of the ship if the space extends from side to side (see Figures 87, 88 and 89). If a coaming is fitted, its height shall not exceed 2 feet, or 0.610 metre.
(i) When there are, on one of the end bulkheads, two tonnage openings, one on each side of the middle plane. If coamings are fitted, their height shall not exceed 2 feet, or 0.610 metre. The height of opening shall in no case be less than 4 feet, or 1.219 metre, and the breadth shall be at least 3 feet, or 0.914 metre;
(ii) When there is, on one of the end bulkheads, one single tonnage opening of at least 5 feet, or 1.524 metre, in height and 4 feet, or 1.219 metre, in breadth, provided that the opening is situated as near as is practicable to the middle plane of the space concerned or of the ship if the space extends from side to side (see Figures 87, 88 and 89). If a coaming is fitted, its height shall not exceed 2 feet, or 0.610 metre.
2. The openings may only be closed either by shifting-boards1) Instead of shifting-boards, sections of channel-bars or similar appliances may be used. fitted in channel-bars, the latter being riveted or welded to the bulkheads, or by loose plates2) The plates may be insulated.held in place by hook bolts not less than 1 foot or 0.305 metre apart centre to centre or by bolts on loose strongbacks, the bolts not passing through the bulkhead. The bulkheads or the channel-bars at the openings must not be provided with holes, hinges, eye-bolts, cleats or any other means which may serve in permanently closing or battening down the openings.
3. If the space is subdivided by bulkheads, such bulkheads shall have openings of the same dimensions and means of closing as indicated hereabove.
4. Where exemption of any superstructure depends on the existence of a tonnage opening or openings in the boundary bulkhead, there shall not exist in this bulkhead any other means of access to the exempted space (see Figure 90).
5. Spaces which are entirely open from deck to deck with no means of closing shall be exempted, provided the breadth of such spaces is at least 3 feet, or 0.914 metre (see Figure 91).
1. A space shall be considered to be open, for the purpose of tonnage measurement: (i) When there are, on one of the end bulkheads, two tonnage openings, one on each side of the middle plane. If coamings are fitted, their height shall not exceed 2 feet, or 0.610 metre. The height of opening shall in no case be less than 4 feet, or 1.219 metre, and the breadth shall be at least 3 feet, or 0.914 metre;
(ii) When there is, on one of the end bulkheads, one single tonnage opening of at least 5 feet, or 1.524 metre, in height and 4 feet, or 1.219 metre, in breadth, provided that the opening is situated as near as is practicable to the middle plane of the space concerned or of the ship if the space extends from side to side (see Figures 87, 88 and 89). If a coaming is fitted, its height shall not exceed 2 feet, or 0.610 metre.
(i) When there are, on one of the end bulkheads, two tonnage openings, one on each side of the middle plane. If coamings are fitted, their height shall not exceed 2 feet, or 0.610 metre. The height of opening shall in no case be less than 4 feet, or 1.219 metre, and the breadth shall be at least 3 feet, or 0.914 metre;
(ii) When there is, on one of the end bulkheads, one single tonnage opening of at least 5 feet, or 1.524 metre, in height and 4 feet, or 1.219 metre, in breadth, provided that the opening is situated as near as is practicable to the middle plane of the space concerned or of the ship if the space extends from side to side (see Figures 87, 88 and 89). If a coaming is fitted, its height shall not exceed 2 feet, or 0.610 metre.
2. The openings may only be closed either by shifting-boards1) Instead of shifting-boards, sections of channel-bars or similar appliances may be used. fitted in channel-bars, the latter being riveted or welded to the bulkheads, or by loose plates2) The plates may be insulated.held in place by hook bolts not less than 1 foot or 0.305 metre apart centre to centre or by bolts on loose strongbacks, the bolts not passing through the bulkhead. The bulkheads or the channel-bars at the openings must not be provided with holes, hinges, eye-bolts, cleats or any other means which may serve in permanently closing or battening down the openings.
3. If the space is subdivided by bulkheads, such bulkheads shall have openings of the same dimensions and means of closing as indicated hereabove.
4. Where exemption of any superstructure depends on the existence of a tonnage opening or openings in the boundary bulkhead, there shall not exist in this bulkhead any other means of access to the exempted space (see Figure 90).
5. Spaces which are entirely open from deck to deck with no means of closing shall be exempted, provided the breadth of such spaces is at least 3 feet, or 0.914 metre (see Figure 91).
(d) General Provisions. 1. All tonnage openings on account of which exemption from inclusion in gross tonnage is claimed shall be so situated as to be open to weather and sea.
2. The dimensions of tonnage openings indicated above serve to determine the clear minimum area of an opening; therefore, the minimum length shall exist over the total minimum breadth (see Figure 92) or the minimum height over the total minimum length (see Figures 85 and 86).
3. In ascertaining the dimensions of tonnage openings, the projection of bars, stanchions, sockets or similar fittings shall be taken into account as reducing the clear area of such openings. In the case of side openings, however, shell flanges of frame angles may encroach on the free surface of the openings (see Figures 85 and 86).
1. All tonnage openings on account of which exemption from inclusion in gross tonnage is claimed shall be so situated as to be open to weather and sea.
2. The dimensions of tonnage openings indicated above serve to determine the clear minimum area of an opening; therefore, the minimum length shall exist over the total minimum breadth (see Figure 92) or the minimum height over the total minimum length (see Figures 85 and 86).
3. In ascertaining the dimensions of tonnage openings, the projection of bars, stanchions, sockets or similar fittings shall be taken into account as reducing the clear area of such openings. In the case of side openings, however, shell flanges of frame angles may encroach on the free surface of the openings (see Figures 85 and 86).
(a) Openings in Decks or Coverings. 1. A space shall be considered to be open for the purpose of tonnage measurement when there is an opening in the centre of the deck or covering above such space. The length of this opening shall not be less than 4 feet, or 1.219 metre, and the breadth shall be at least equal to that of the nearest cargo hatch on the same deck or covering.
2. If exemption from inclusion in gross tonnage is claimed for a shelter-deck space or part of it, the distance between the aft side (after coaming) of the deck opening and the aft side of the stern post shall not be less than one-twentieth of the identification length of the ship when the opening is situated aft; or the distance between the fore side (fore coaming) of the deck opening and the fore side of the stem shall not be less than one-fifth of this length if the opening is situated forward.
3. If coamings are fitted, their mean height above the deck or covering shall not exceed 1 foot, or 0.305 metre. Guard-rails, stanchions or sockets around the opening shall be fitted in such a way as to prevent any battening down of the opening. Only portable wooden covers are allowed, and it is permissible to hold such covers in place by lashings beneath of cordage (not steel wires) of hemp or similar material (see Figure 83).
4. Tonnage openings in the deck shall not be fitted under a deck, permanent platform or any other similar structure (see Figure 84).
1. A space shall be considered to be open for the purpose of tonnage measurement when there is an opening in the centre of the deck or covering above such space. The length of this opening shall not be less than 4 feet, or 1.219 metre, and the breadth shall be at least equal to that of the nearest cargo hatch on the same deck or covering.
2. If exemption from inclusion in gross tonnage is claimed for a shelter-deck space or part of it, the distance between the aft side (after coaming) of the deck opening and the aft side of the stern post shall not be less than one-twentieth of the identification length of the ship when the opening is situated aft; or the distance between the fore side (fore coaming) of the deck opening and the fore side of the stem shall not be less than one-fifth of this length if the opening is situated forward.
3. If coamings are fitted, their mean height above the deck or covering shall not exceed 1 foot, or 0.305 metre. Guard-rails, stanchions or sockets around the opening shall be fitted in such a way as to prevent any battening down of the opening. Only portable wooden covers are allowed, and it is permissible to hold such covers in place by lashings beneath of cordage (not steel wires) of hemp or similar material (see Figure 83).
4. Tonnage openings in the deck shall not be fitted under a deck, permanent platform or any other similar structure (see Figure 84).
(b) Openings in the Sides of the Ship or in the Side Bulkheads of a Superstructure. 1. A space shall be considered to be open for the purpose of tonnage measurement when there are one or more openings on both sides in the shell or in the side bulkheads of a superstructure. When there is only one opening in each side, the length shall not be less than 18 feet, or 5.486 metres, and the height shall not be less than 2.5 feet, or 0.762 metre. When there is more than one opening in each side, the height of such openings shall not be less than 2.5 feet, or 0.762 metre, and their total area on each side not less than 60 square feet, or 5.574 square metres. No opening shall have an area of less than 25 square feet, or 2.323 square metres (see Figures 85 and 86).
2. Should there be a well between thwartship bulkheads, the openings in the shell or in the side bulkheads shall have a length of 18 feet, or 5.486 metres, if possible, or not less than three-fourths of the length between the thwartship bulkheads. The height shall not be less than 2.5 feet, or 0.762 metre. The area of the opening on each side should be at least 45 square feet, or 4.181 square metres.
3. All side openings shall be in corresponding positions on both sides of the ship or of the superstructure; they shall not be fitted with any permanent means of closing. The only means allowed for closing side openings are shifting boards, fitted in channel-bars riveted or welded to the shell or to the side bulkheads. Neither the shell or bulkheads at the openings, nor the channel-bars, nor the frames crossing the openings are to be provided with holes, hinges, eyebolts, cleats or any other means which may serve in permanently closing or battening down the openings.
4. Side openings shall not be enclosed by bulkheads or otherwise.
1. A space shall be considered to be open for the purpose of tonnage measurement when there are one or more openings on both sides in the shell or in the side bulkheads of a superstructure. When there is only one opening in each side, the length shall not be less than 18 feet, or 5.486 metres, and the height shall not be less than 2.5 feet, or 0.762 metre. When there is more than one opening in each side, the height of such openings shall not be less than 2.5 feet, or 0.762 metre, and their total area on each side not less than 60 square feet, or 5.574 square metres. No opening shall have an area of less than 25 square feet, or 2.323 square metres (see Figures 85 and 86).
2. Should there be a well between thwartship bulkheads, the openings in the shell or in the side bulkheads shall have a length of 18 feet, or 5.486 metres, if possible, or not less than three-fourths of the length between the thwartship bulkheads. The height shall not be less than 2.5 feet, or 0.762 metre. The area of the opening on each side should be at least 45 square feet, or 4.181 square metres.
3. All side openings shall be in corresponding positions on both sides of the ship or of the superstructure; they shall not be fitted with any permanent means of closing. The only means allowed for closing side openings are shifting boards, fitted in channel-bars riveted or welded to the shell or to the side bulkheads. Neither the shell or bulkheads at the openings, nor the channel-bars, nor the frames crossing the openings are to be provided with holes, hinges, eyebolts, cleats or any other means which may serve in permanently closing or battening down the openings.
4. Side openings shall not be enclosed by bulkheads or otherwise.
(c) Openings in Thwartship Bulkheads. 1. A space shall be considered to be open, for the purpose of tonnage measurement: (i) When there are, on one of the end bulkheads, two tonnage openings, one on each side of the middle plane. If coamings are fitted, their height shall not exceed 2 feet, or 0.610 metre. The height of opening shall in no case be less than 4 feet, or 1.219 metre, and the breadth shall be at least 3 feet, or 0.914 metre;
(ii) When there is, on one of the end bulkheads, one single tonnage opening of at least 5 feet, or 1.524 metre, in height and 4 feet, or 1.219 metre, in breadth, provided that the opening is situated as near as is practicable to the middle plane of the space concerned or of the ship if the space extends from side to side (see Figures 87, 88 and 89). If a coaming is fitted, its height shall not exceed 2 feet, or 0.610 metre.
(i) When there are, on one of the end bulkheads, two tonnage openings, one on each side of the middle plane. If coamings are fitted, their height shall not exceed 2 feet, or 0.610 metre. The height of opening shall in no case be less than 4 feet, or 1.219 metre, and the breadth shall be at least 3 feet, or 0.914 metre;
(ii) When there is, on one of the end bulkheads, one single tonnage opening of at least 5 feet, or 1.524 metre, in height and 4 feet, or 1.219 metre, in breadth, provided that the opening is situated as near as is practicable to the middle plane of the space concerned or of the ship if the space extends from side to side (see Figures 87, 88 and 89). If a coaming is fitted, its height shall not exceed 2 feet, or 0.610 metre.
2. The openings may only be closed either by shifting-boards1) Instead of shifting-boards, sections of channel-bars or similar appliances may be used. fitted in channel-bars, the latter being riveted or welded to the bulkheads, or by loose plates2) The plates may be insulated.held in place by hook bolts not less than 1 foot or 0.305 metre apart centre to centre or by bolts on loose strongbacks, the bolts not passing through the bulkhead. The bulkheads or the channel-bars at the openings must not be provided with holes, hinges, eye-bolts, cleats or any other means which may serve in permanently closing or battening down the openings.
3. If the space is subdivided by bulkheads, such bulkheads shall have openings of the same dimensions and means of closing as indicated hereabove.
4. Where exemption of any superstructure depends on the existence of a tonnage opening or openings in the boundary bulkhead, there shall not exist in this bulkhead any other means of access to the exempted space (see Figure 90).
5. Spaces which are entirely open from deck to deck with no means of closing shall be exempted, provided the breadth of such spaces is at least 3 feet, or 0.914 metre (see Figure 91).
1. A space shall be considered to be open, for the purpose of tonnage measurement: (i) When there are, on one of the end bulkheads, two tonnage openings, one on each side of the middle plane. If coamings are fitted, their height shall not exceed 2 feet, or 0.610 metre. The height of opening shall in no case be less than 4 feet, or 1.219 metre, and the breadth shall be at least 3 feet, or 0.914 metre;
(ii) When there is, on one of the end bulkheads, one single tonnage opening of at least 5 feet, or 1.524 metre, in height and 4 feet, or 1.219 metre, in breadth, provided that the opening is situated as near as is practicable to the middle plane of the space concerned or of the ship if the space extends from side to side (see Figures 87, 88 and 89). If a coaming is fitted, its height shall not exceed 2 feet, or 0.610 metre.
(i) When there are, on one of the end bulkheads, two tonnage openings, one on each side of the middle plane. If coamings are fitted, their height shall not exceed 2 feet, or 0.610 metre. The height of opening shall in no case be less than 4 feet, or 1.219 metre, and the breadth shall be at least 3 feet, or 0.914 metre;
(ii) When there is, on one of the end bulkheads, one single tonnage opening of at least 5 feet, or 1.524 metre, in height and 4 feet, or 1.219 metre, in breadth, provided that the opening is situated as near as is practicable to the middle plane of the space concerned or of the ship if the space extends from side to side (see Figures 87, 88 and 89). If a coaming is fitted, its height shall not exceed 2 feet, or 0.610 metre.
2. The openings may only be closed either by shifting-boards1) Instead of shifting-boards, sections of channel-bars or similar appliances may be used. fitted in channel-bars, the latter being riveted or welded to the bulkheads, or by loose plates2) The plates may be insulated.held in place by hook bolts not less than 1 foot or 0.305 metre apart centre to centre or by bolts on loose strongbacks, the bolts not passing through the bulkhead. The bulkheads or the channel-bars at the openings must not be provided with holes, hinges, eye-bolts, cleats or any other means which may serve in permanently closing or battening down the openings.
3. If the space is subdivided by bulkheads, such bulkheads shall have openings of the same dimensions and means of closing as indicated hereabove.
4. Where exemption of any superstructure depends on the existence of a tonnage opening or openings in the boundary bulkhead, there shall not exist in this bulkhead any other means of access to the exempted space (see Figure 90).
5. Spaces which are entirely open from deck to deck with no means of closing shall be exempted, provided the breadth of such spaces is at least 3 feet, or 0.914 metre (see Figure 91).
(d) General Provisions. 1. All tonnage openings on account of which exemption from inclusion in gross tonnage is claimed shall be so situated as to be open to weather and sea.
2. The dimensions of tonnage openings indicated above serve to determine the clear minimum area of an opening; therefore, the minimum length shall exist over the total minimum breadth (see Figure 92) or the minimum height over the total minimum length (see Figures 85 and 86).
3. In ascertaining the dimensions of tonnage openings, the projection of bars, stanchions, sockets or similar fittings shall be taken into account as reducing the clear area of such openings. In the case of side openings, however, shell flanges of frame angles may encroach on the free surface of the openings (see Figures 85 and 86).
1. All tonnage openings on account of which exemption from inclusion in gross tonnage is claimed shall be so situated as to be open to weather and sea.
2. The dimensions of tonnage openings indicated above serve to determine the clear minimum area of an opening; therefore, the minimum length shall exist over the total minimum breadth (see Figure 92) or the minimum height over the total minimum length (see Figures 85 and 86).
3. In ascertaining the dimensions of tonnage openings, the projection of bars, stanchions, sockets or similar fittings shall be taken into account as reducing the clear area of such openings. In the case of side openings, however, shell flanges of frame angles may encroach on the free surface of the openings (see Figures 85 and 86).