CA2009908C - Deployment arm - Google Patents
Deployment arm Download PDFInfo
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- CA2009908C CA2009908C CA 2009908 CA2009908A CA2009908C CA 2009908 C CA2009908 C CA 2009908C CA 2009908 CA2009908 CA 2009908 CA 2009908 A CA2009908 A CA 2009908A CA 2009908 C CA2009908 C CA 2009908C
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- vessel
- deployment structure
- survival craft
- central part
- craft
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Abstract
There is provided a new and useful deployment structure for launching a survival craft at sea from a vessel, the deployment structure adapted for rotation between a secured position and a deployed position and comprising an elongated central part having a lower end for rotatable connection to the vessel and an upper end for rotatably supporting a survival craft or a survival craft cradle; and wherein, when the structure is in the secured position on a vessel, a section of the elongated part extends in the outboard direction beyond a vertical plane through the means for rotatably supporting the craft or the cradle.
Description
This application relates to deployment structures for deploying survival craft from a vessel at sea.
BACKGROUND OF TFIE INVENTION
There has always been a need for an improved means for launching lifeboats at sea under extremely adverse conditions. For example, the need to abandon a vessel is frequently brought about by the existence of such adverse conditions. Survival craft deployment structures must be designed to operate effectively under such conditions.
Notwithstanding the widespread knowledge of the existence of serious flaws in current deployment systems, an entirely suitable system has not as yet been made commercially available.
Recent occurrences involving the loss of off-shore drilling installations involving very substantial loss of life have served to focus the need. As well, new regulations have been and are being written in various jurisdictions which serve to increase certain of the requirements of deployment structures.
Against this background a deployment structure has been developed which addresses both the ongoing need for an effective launch system and certain of the requirements imposed by increasingly stringent regulation.
PRTOR ART
Innumerable systems are known for launching lifeboats or, more recently, survival craft, from vessels at sea. Among these are some which provide a deployment arm or arms which pivot ..
outwardly of the vessel to deposit the lifeboat at a distance from the vessel. Typical of these are the system shown in British Patent 332,690, issued July 31, 1930, to Cahill and British Patent 2 123 353 A, issued February, 1984, to von Tell Nico AB.
An overall system having similarities to the present is described and claimed in the present inventor's earlier Canadian Patent No. 1,208,082, issued July 22, 1986, to O'Brien.
None of the prior systems of which applicant is aware addresses the problems to which the present application is directed.
sur~r~~x o~ ~x~ ~~vErrTZOZn It has now been discovered that a number of problems inherent in earlier deployment structures can be overcome by an arrangement in which the centre of gravity of a combined deployment structure and lifeboat or survival craft is substantially independent of the positioning of the survival craft but rather is dependent on the positioning of the deployment structure.
Accordingly, the present invention provides a deployment structure for launching a survival craft at sea from a vessel, the deployment structure adapted for rotation between a secured position and a deployed position and comprising an elongated central part having a lower end for rotatable connection to the vessel and an upper end having means for rotatably supporting a survival craft or a survival craft cradle; and wherein, when the structure is in the secured position on a vessel, a section of the elongated part extends in the outboard direction beyond a vertical plane thraugh the means for rotatably supporting the craft or the cradle.
In a further embodiment there is provided in combination a survival craft, a vessel and a deployment structure for launching the craft from the vessel, 'the deployment structure comprising an elongated central part having an inner end for rotatable connection to the vessel, and an outer end; and a survival craft support section secured toward the outer end and having means thereon for pivotally supporting a survival craft or a survival craft cradle;
and wherein the means for supporting is located between the longitudinal axis of the central section and a vertical plane through the lower end.
GEPIERAh DESCRTPTTON
Regulatory changes, economic factors and physical constraints on vessels have combined to present new problems in survival craft deployment structures. For example, new regulations being put into effect by the International Maritime Organization will permit in a collision or flooding of void spaces on mobile offshore drilling units (MODtJ's) maximum angles of declination of 17Q and 25' respectively.
These regulations obviously impact upon deployment structures which are gravity driven. A deployment structure of the general type of the present case; that is, of the type where an elongated arm or structure is hinged at the side of a platform to be lowered outwardly of the platform on activation by gravitational forces, must be capable of performing its intended function when _ g _ she platform is at maximum list.
One manner of accomplishing this result is to place the deployment structure at an initial angle to the vertical which will ensure that, even at, say, a 25° list, the deployment structure will operate normally.
To date a lifeboat or survival craft has normally been positioned at the extremity of the deployment structure, generally on the axis of that structure. Where the angle between the verticals of an off-share drilling platform and the deployment structure is substantial, in order to deal with the list requirement, this type of survival craft positioning may result in the craft being at a substantial distance from the edge of the platform. It would therefore be necessary to build a cantilevered structure to support the davit and to support an extended closed companionway or passageway and to provide the extended closed . companionway itself. This last assumes that a closed companionway or passageway will be an important aspect of the escape system.
' These additional structures add very substantially to the ' expense of the escape system and, in addition, may adversely effect the centre of gravity and overall weight of the platform. The impact on the variable deckload capacity of the rig greatly reduces its capability and greatly increases the cost of exploration and production. It may therefore be very disadvantageous to locate the survival craft at a distance from the platform structure.
The present invention provides a system which reconciles these factors such that the deployment structure will operate properly notwithstanding substantial list of the platform, but in r which the survival craft is located close to the edge of the platform. That is accomplished in general by extending the deployment structure beyond the vertical plane through the support points or centre of gravity of the survival craft to thereby shift the combined centre of gravity of the survival craft and the deployment structure in the outboard direction relative to the platform. Because the weight of the deployment structure will normally be so much greater than that of the survival craft as to render the weight of the craft relatively insignificant, this extension of the deployment structure may in many cases be small.
20 While the above discussion has made reference to an off-shore drilling platform, in particular because of an obvious need in that area and because of the changing regulations which must be addressed, it should also be understood that the system of the present invention is applicable to production units, both fixed and floating, to exploration units and to ships. The general expression vessel will thus be used to include off-shore drilling platforms of various types, and ships.
B3tTEF DESCRTPTTON OF TI3E DRAWTNGS
In drawings which illustrate embodiments of the invention, FIGURE 1 is a plan view of a drilling platform having the invention secured thereto;
FIGURE 2 is an elevation of the platform of FIGURE 1;
FIGURE 3 is an elevation of a deployment structure according to the invention; and FIGURE 4 is a top plan view of the structure of FIGURE 1 _ 5 in a partly deployed position.
While 'the invention will be described in conjunction with illustrated embodiments, it will be understood that it is not intended to limit the invention to such embodiments. On the contrary, it is intended to cover all alternatives, modifications and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims.
DETAIL DESCRIPTION OF THE PREFERRED EMBODI1~IENTS
In the following description, similar features in the drawings have been given similar reference numerals.
The off°shore platform 10 has associated with it an escape system 12 for use should an emergency necessitate evacuation of the rig. The basic components of the escape system are the deployment structure 14, the boat 16 and the cable system 18.
The boat 16 will normally be a totally enclosed motor propelled survival craft. This craft is not a part of the present invention. Various existing such craft or those to be designed can readily be adapted to the present system.
The deployment structure 14 in the preferred configuration comprises a pair of elongated structural members 20 and 22 joined and interbraced by the bracing structure 24.
Each of the elongated structural members 20 and 22 includes a central section 26, a lower end section 28 and an upper end section 30. The lower end sections 28 are rotatably connected at pins 32 to the main transverse girder 34 of the platform 10.
The deployment structure 14 is rotatable between the - 6 °
secured position illustrated in FIGURES 1 to 3 and a deployed position in which the upper end section 30 of deployment structure 14 is submerged, along with at least a part of cradle 42. FIGURE
4 illustrates structure 14 in a partially deployed position.
The rotation of the deployment structure 14 is controlled by a winch and cable system preferably comprising a double winch 36 at deck level and cables 38 and 40 running from winch 36 to structural members 20 and 22 respectively.
While various systems may be used for securing the craft 16 to the deployment structure 14, it is highly preferred that a cradle 42 be interposed between craft 16 and structure 14. Thus, as illustrated, the cradle 42 is rotatably suspended from deployment structure 14 at pins 44 and 46 on axis of rotation 47.
The craft 16 is then carried unrestrained in the cradle so that, when the deployment structure 14 is lowered to a position below water level, the craft 16 will simply float off of the cradle 42.
In order to ensure proper launch in a situation where the platform 10 is at a substantial list, the deployment structure 14 is extended at part 50 of its upper end section 30 beyond a vertical plane 48 through the pins 44 and 46, which will normally also be through the centre of gravity of the craft 16.
The part 50 of the upper end section 30 of structural members 20 and 22 may extend to varying degrees beyond the plane 48 and may assume various configurations. The effect will be to move the combined centre of gravity of the craft 16 and the deployment structure 14 in the outboard direction or toward upper end section 30.
In the case of a substantially straight deployment structure, such as that illustrated, the positioning of the pins 44 and 46 can generally be expressed as being between the axis 52 of the central sections 26 and the vertical plane through pins 32.
This can also be generally expressed as a situation where the pins 44 and 46 are offset in the inboard direction from the axis 52.
While the preferred configuration is illustrated, various other structures could achieve the desired result. For example, the deployment structure 14 could be convexly curved such that the maximum outboard reach of the curvature is beyond the plane 48.
In a typical installation where a platform 10 is allowed a maximum 25° list, the angle a between the axis 52 and the plane 54 may be chosen to be 30°, The structure 50 beyond the plane 48 will then depend on the desired placement of the craft 16 relative to the platform 10.
Thus it is apparent that there has been provided in accordance with the invention a deployment structure far launching a survival craft at sea from a vessel that fully satisfies the objects, aims and advantages set forth above. While the invention has been described in conjunction with specific embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications and variations as fall within the spirit and broad scope of the invention.
g .~
BACKGROUND OF TFIE INVENTION
There has always been a need for an improved means for launching lifeboats at sea under extremely adverse conditions. For example, the need to abandon a vessel is frequently brought about by the existence of such adverse conditions. Survival craft deployment structures must be designed to operate effectively under such conditions.
Notwithstanding the widespread knowledge of the existence of serious flaws in current deployment systems, an entirely suitable system has not as yet been made commercially available.
Recent occurrences involving the loss of off-shore drilling installations involving very substantial loss of life have served to focus the need. As well, new regulations have been and are being written in various jurisdictions which serve to increase certain of the requirements of deployment structures.
Against this background a deployment structure has been developed which addresses both the ongoing need for an effective launch system and certain of the requirements imposed by increasingly stringent regulation.
PRTOR ART
Innumerable systems are known for launching lifeboats or, more recently, survival craft, from vessels at sea. Among these are some which provide a deployment arm or arms which pivot ..
outwardly of the vessel to deposit the lifeboat at a distance from the vessel. Typical of these are the system shown in British Patent 332,690, issued July 31, 1930, to Cahill and British Patent 2 123 353 A, issued February, 1984, to von Tell Nico AB.
An overall system having similarities to the present is described and claimed in the present inventor's earlier Canadian Patent No. 1,208,082, issued July 22, 1986, to O'Brien.
None of the prior systems of which applicant is aware addresses the problems to which the present application is directed.
sur~r~~x o~ ~x~ ~~vErrTZOZn It has now been discovered that a number of problems inherent in earlier deployment structures can be overcome by an arrangement in which the centre of gravity of a combined deployment structure and lifeboat or survival craft is substantially independent of the positioning of the survival craft but rather is dependent on the positioning of the deployment structure.
Accordingly, the present invention provides a deployment structure for launching a survival craft at sea from a vessel, the deployment structure adapted for rotation between a secured position and a deployed position and comprising an elongated central part having a lower end for rotatable connection to the vessel and an upper end having means for rotatably supporting a survival craft or a survival craft cradle; and wherein, when the structure is in the secured position on a vessel, a section of the elongated part extends in the outboard direction beyond a vertical plane thraugh the means for rotatably supporting the craft or the cradle.
In a further embodiment there is provided in combination a survival craft, a vessel and a deployment structure for launching the craft from the vessel, 'the deployment structure comprising an elongated central part having an inner end for rotatable connection to the vessel, and an outer end; and a survival craft support section secured toward the outer end and having means thereon for pivotally supporting a survival craft or a survival craft cradle;
and wherein the means for supporting is located between the longitudinal axis of the central section and a vertical plane through the lower end.
GEPIERAh DESCRTPTTON
Regulatory changes, economic factors and physical constraints on vessels have combined to present new problems in survival craft deployment structures. For example, new regulations being put into effect by the International Maritime Organization will permit in a collision or flooding of void spaces on mobile offshore drilling units (MODtJ's) maximum angles of declination of 17Q and 25' respectively.
These regulations obviously impact upon deployment structures which are gravity driven. A deployment structure of the general type of the present case; that is, of the type where an elongated arm or structure is hinged at the side of a platform to be lowered outwardly of the platform on activation by gravitational forces, must be capable of performing its intended function when _ g _ she platform is at maximum list.
One manner of accomplishing this result is to place the deployment structure at an initial angle to the vertical which will ensure that, even at, say, a 25° list, the deployment structure will operate normally.
To date a lifeboat or survival craft has normally been positioned at the extremity of the deployment structure, generally on the axis of that structure. Where the angle between the verticals of an off-share drilling platform and the deployment structure is substantial, in order to deal with the list requirement, this type of survival craft positioning may result in the craft being at a substantial distance from the edge of the platform. It would therefore be necessary to build a cantilevered structure to support the davit and to support an extended closed companionway or passageway and to provide the extended closed . companionway itself. This last assumes that a closed companionway or passageway will be an important aspect of the escape system.
' These additional structures add very substantially to the ' expense of the escape system and, in addition, may adversely effect the centre of gravity and overall weight of the platform. The impact on the variable deckload capacity of the rig greatly reduces its capability and greatly increases the cost of exploration and production. It may therefore be very disadvantageous to locate the survival craft at a distance from the platform structure.
The present invention provides a system which reconciles these factors such that the deployment structure will operate properly notwithstanding substantial list of the platform, but in r which the survival craft is located close to the edge of the platform. That is accomplished in general by extending the deployment structure beyond the vertical plane through the support points or centre of gravity of the survival craft to thereby shift the combined centre of gravity of the survival craft and the deployment structure in the outboard direction relative to the platform. Because the weight of the deployment structure will normally be so much greater than that of the survival craft as to render the weight of the craft relatively insignificant, this extension of the deployment structure may in many cases be small.
20 While the above discussion has made reference to an off-shore drilling platform, in particular because of an obvious need in that area and because of the changing regulations which must be addressed, it should also be understood that the system of the present invention is applicable to production units, both fixed and floating, to exploration units and to ships. The general expression vessel will thus be used to include off-shore drilling platforms of various types, and ships.
B3tTEF DESCRTPTTON OF TI3E DRAWTNGS
In drawings which illustrate embodiments of the invention, FIGURE 1 is a plan view of a drilling platform having the invention secured thereto;
FIGURE 2 is an elevation of the platform of FIGURE 1;
FIGURE 3 is an elevation of a deployment structure according to the invention; and FIGURE 4 is a top plan view of the structure of FIGURE 1 _ 5 in a partly deployed position.
While 'the invention will be described in conjunction with illustrated embodiments, it will be understood that it is not intended to limit the invention to such embodiments. On the contrary, it is intended to cover all alternatives, modifications and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims.
DETAIL DESCRIPTION OF THE PREFERRED EMBODI1~IENTS
In the following description, similar features in the drawings have been given similar reference numerals.
The off°shore platform 10 has associated with it an escape system 12 for use should an emergency necessitate evacuation of the rig. The basic components of the escape system are the deployment structure 14, the boat 16 and the cable system 18.
The boat 16 will normally be a totally enclosed motor propelled survival craft. This craft is not a part of the present invention. Various existing such craft or those to be designed can readily be adapted to the present system.
The deployment structure 14 in the preferred configuration comprises a pair of elongated structural members 20 and 22 joined and interbraced by the bracing structure 24.
Each of the elongated structural members 20 and 22 includes a central section 26, a lower end section 28 and an upper end section 30. The lower end sections 28 are rotatably connected at pins 32 to the main transverse girder 34 of the platform 10.
The deployment structure 14 is rotatable between the - 6 °
secured position illustrated in FIGURES 1 to 3 and a deployed position in which the upper end section 30 of deployment structure 14 is submerged, along with at least a part of cradle 42. FIGURE
4 illustrates structure 14 in a partially deployed position.
The rotation of the deployment structure 14 is controlled by a winch and cable system preferably comprising a double winch 36 at deck level and cables 38 and 40 running from winch 36 to structural members 20 and 22 respectively.
While various systems may be used for securing the craft 16 to the deployment structure 14, it is highly preferred that a cradle 42 be interposed between craft 16 and structure 14. Thus, as illustrated, the cradle 42 is rotatably suspended from deployment structure 14 at pins 44 and 46 on axis of rotation 47.
The craft 16 is then carried unrestrained in the cradle so that, when the deployment structure 14 is lowered to a position below water level, the craft 16 will simply float off of the cradle 42.
In order to ensure proper launch in a situation where the platform 10 is at a substantial list, the deployment structure 14 is extended at part 50 of its upper end section 30 beyond a vertical plane 48 through the pins 44 and 46, which will normally also be through the centre of gravity of the craft 16.
The part 50 of the upper end section 30 of structural members 20 and 22 may extend to varying degrees beyond the plane 48 and may assume various configurations. The effect will be to move the combined centre of gravity of the craft 16 and the deployment structure 14 in the outboard direction or toward upper end section 30.
In the case of a substantially straight deployment structure, such as that illustrated, the positioning of the pins 44 and 46 can generally be expressed as being between the axis 52 of the central sections 26 and the vertical plane through pins 32.
This can also be generally expressed as a situation where the pins 44 and 46 are offset in the inboard direction from the axis 52.
While the preferred configuration is illustrated, various other structures could achieve the desired result. For example, the deployment structure 14 could be convexly curved such that the maximum outboard reach of the curvature is beyond the plane 48.
In a typical installation where a platform 10 is allowed a maximum 25° list, the angle a between the axis 52 and the plane 54 may be chosen to be 30°, The structure 50 beyond the plane 48 will then depend on the desired placement of the craft 16 relative to the platform 10.
Thus it is apparent that there has been provided in accordance with the invention a deployment structure far launching a survival craft at sea from a vessel that fully satisfies the objects, aims and advantages set forth above. While the invention has been described in conjunction with specific embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications and variations as fall within the spirit and broad scope of the invention.
g .~
Claims (9)
1. A deployment structure for launching a survival craft at sea from a vessel, said deployment structure adapted for rotation between a secured position and a deployed position and comprising an elongated central part having a lower end for rotatable connection to said vessel and an upper end having means for rotatably supporting on an axis of rotation said survival craft or a survival craft cradle; and wherein, when said structure is in the secured position on said vessel, a section of said elongated central part or said upper end extends in the outboard direction of said deployment structure beyond the vertical plane through said axis of rotation.
2. A deployment structure for launching a survival craft at sea from a vessel, said deployment structure adapted for rotation between a secured position and a deployed position and comprising:
an elongated central part having a lower end for rotatable connection to said vessel, and an upper end; and a survival craft support section secured toward said upper end and having means thereon for pivotally supporting said survival craft or a survival craft cradle on an axis of rotation;
and wherein, when said structure is in said secured position on said vessel, a section of said elongated central part extends in the outboard direction of said deployment structure beyond a vertical plane through said axis of rotation such that the combined centre of gravity of said deployment structure and said survival craft supported thereon is shifted in the outboard direction.
an elongated central part having a lower end for rotatable connection to said vessel, and an upper end; and a survival craft support section secured toward said upper end and having means thereon for pivotally supporting said survival craft or a survival craft cradle on an axis of rotation;
and wherein, when said structure is in said secured position on said vessel, a section of said elongated central part extends in the outboard direction of said deployment structure beyond a vertical plane through said axis of rotation such that the combined centre of gravity of said deployment structure and said survival craft supported thereon is shifted in the outboard direction.
3. The deployment structure of claim 1 wherein said upper end is offset to the inboard side of said elongated central part.
4. The deployment structure of claim 2 wherein when said structure is in said secured position on said vessel, said elongated central part is straight and said axis of rotation is located between the longitudinal axis of said elongated central part and said vessel.
5. The deployment structure of claim 3 wherein said longitudinal axis is at least 30° to the vertical.
6. A deployment structure for launching a survival craft at sea from a vessel, said deployment structure comprising:
an elongated straight central part having a lower end for rotatably attaching to said vessel, and an upper end; and a survival craft support section secured toward said outer end of said central part and having means thereon for pivotally supporting said survival craft or a survival craft cradle;
and wherein when said deployment structure is installed on said vessel, said means for supporting is located between the longitudinal axis of said central part and said vessel.
an elongated straight central part having a lower end for rotatably attaching to said vessel, and an upper end; and a survival craft support section secured toward said outer end of said central part and having means thereon for pivotally supporting said survival craft or a survival craft cradle;
and wherein when said deployment structure is installed on said vessel, said means for supporting is located between the longitudinal axis of said central part and said vessel.
7. The deployment structure of claim 6 wherein said central part comprises a pair of interbraced spaced members and said support section comprises a pair of upstanding supports, one on each of said spaced members, for supporting said survival craft cradle therebetween.
8. The deployment structure of claim 7 wherein said upstanding supports are spaced inwardly from said outer end of said central part.
9. In combination a survival craft, a vessel and a deployment structure for launching said craft from said vessel, said deployment structure comprising:
an elongated central part having an inner end for rotatable connection to said vessel, and an upper end section; and a survival craft support section secured toward said upper end section and having means thereon for pivotally supporting a survival craft or a survival craft cradle;
and wherein said means for supporting is offset inwardly of said upper end section toward said vessel to thereby move the centre of gravity of said structure and said boat toward said vessel.
an elongated central part having an inner end for rotatable connection to said vessel, and an upper end section; and a survival craft support section secured toward said upper end section and having means thereon for pivotally supporting a survival craft or a survival craft cradle;
and wherein said means for supporting is offset inwardly of said upper end section toward said vessel to thereby move the centre of gravity of said structure and said boat toward said vessel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2009908 CA2009908C (en) | 1990-02-13 | 1990-02-13 | Deployment arm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2009908 CA2009908C (en) | 1990-02-13 | 1990-02-13 | Deployment arm |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2009908A1 CA2009908A1 (en) | 1991-08-13 |
| CA2009908C true CA2009908C (en) | 2003-04-29 |
Family
ID=4144276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2009908 Expired - Lifetime CA2009908C (en) | 1990-02-13 | 1990-02-13 | Deployment arm |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2009908C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018105545A1 (en) * | 2018-03-09 | 2019-09-12 | Overdick Gmbh & Co. Kg | boat lift |
-
1990
- 1990-02-13 CA CA 2009908 patent/CA2009908C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2009908A1 (en) | 1991-08-13 |
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| EEER | Examination request | ||
| MKEX | Expiry |