Thomas R Hagner

US Patent:

6357373, Mar 19, 2002

Filed:

Oct 12, 2000

Appl. No.:

09/689420

Inventors:

Thomas Hagner - Swarthmore PA
Steven Pagan - Limerick PA
George Mara - Middletown NJ
Matthew D. Jones - Sugar Land TX

Assignee:

Maritrans Inc. - Tampa FL

International Classification:

B63B 362

US Classification:

114 65R, 114 74 A

Abstract:

An existing single hull vessel is rebuilt to provide a double hull vessel by cutting and removing the topside decking and internal vessel structure of the single hull vessel and inserting an inner hull structure within a volume defined by the original hull. The original hull defines an exterior (outer hull) of the rebuilt double hull vessel and the inner hull defines an interior cargo carrying volume and forms a boundary in the event that the outer hull is penetrated. In addition, a trunk structure, raised deck, and lower bulkhead portions may be used to prevent the loss of cargo carrying capacity due to the new double hull. The double hull covers at least the length of the cargo carrying section of the vessel along the bottom and sides of the cargo section. This method of internal double hulling results in the original vessel structure being reused to the maximum extent possible, and the major exterior dimensions and outer hull hydrodynamic characteristics of the vessel remaining substantially the same after the process of double hulling is complete.

US Patent:

6637359, Oct 28, 2003

Filed:

Nov 21, 2001

Appl. No.:

09/989846

Inventors:

Thomas Hagner - Riverview FL

Assignee:

Maritrans Inc. - Tampa FL

International Classification:

B63B 362

US Classification:

114 65R, 114 74 A

Abstract:

A system and method for fitting a new inner hull internally over an existing single hull to form a rebuilt double hull vessel. The topside decking and internal vessel structure of the existing single hull vessel is cut and removed and the inner hull structure is inserted within a volume defined by the original hull. The original hull defines an exterior (outer hull) of the rebuilt double hull vessel and the inner hull defines an interior cargo carrying volume and forms a secondary boundary in the event that the outer hull is penetrated. A face bar and filler plate combination is used to connect the new inner hull to the existing outer hull and accounts for dimensional tolerances between the two structures. In addition, detailed ship surveys are conducted to measure the vessel structure and advanced, computerized drafting techniques are employed to improve the fit-up of the new inner hull structure with the existing outer hull structure.

US Patent:

6708636, Mar 23, 2004

Filed:

Feb 21, 2003

Appl. No.:

10/371832

Inventors:

Thomas R. Hagner - Riverview FL

Assignee:

Maritrans Inc. - Tampa FL

International Classification:

B63B 2512

US Classification:

114 74A, 114 65 R

Abstract:

The present invention relates to a rebuilt double hull tanker and a method of rebuilding an existing single hull tanker into a rebuilt double hull tanker. The rebuilt double hull tanker includes a rebuilt double hull comprising a new double bottom hull and new double side hulls. The internally rebuilt double bottom hull includes the existing outer bottom hull and a new inner bottom hull that is disposed internal and spaced apart from the existing outer bottom hull. The externally rebuilt double side hulls (e. g. , port and starboard) include the existing inner side hulls and new outer side hulls disposed external and spaced apart from the existing inner side hull. The rebuilt double bottom hull is connected at each end (e. g. , at the turn of the bilge) to the rebuilt double side hulls. The method includes forming the new double hull, including a new double bottom hull and new double side hulls, over at least the cargo carrying portion of the tanker by installing the new inner bottom hull internally over the existing outer bottom hull through access holes cut into the sides of the tanker and installing the new double side hulls externally over the existing inner side hulls.

US Patent:

6907836, Jun 21, 2005

Filed:

Mar 23, 2004

Appl. No.:

10/806904

Inventors:

Thomas R. Hagner - Riverview FL, US

Assignee:

Maritrans, Inc. - Tampa FL

International Classification:

B63B025/12

US Classification:

114 74A, 114 65 R

Abstract:

The present invention relates to a rebuilt double hull tanker and a method of rebuilding an existing single hull tanker into a rebuilt double hull tanker. The rebuilt double hull tanker includes an internally rebuilt double bottom hull comprising the existing outer bottom hull and a new inner bottom hull that is disposed internal and spaced apart from the existing outer bottom hull and externally rebuilt double side hulls (e. g. , port and starboard) comprising the existing inner side hulls and new outer side hulls disposed external and spaced apart from the existing inner side hull. The method includes forming the new double hull, including a new double bottom hull and new double side hulls, over at least the cargo carrying portion of the tanker by installing at least a portion of the new inner bottom hull internally over the existing outer bottom hull through cut-outs in the topside decking. The method also includes the use of model basin testing and computational fluid dynamics to assist in the hull design in the area of the transition regions between the new outer side hull and the existing side hull.

US Patent:

61704202, Jan 9, 2001

Filed:

Apr 9, 1999

Appl. No.:

9/289031

Inventors:

Thomas Hagner - Swarthmore PA
Steven Pagan - Limerick PA
George Mara - Middletown NJ
Matthew D. Jones - Sugar Land TX

Assignee:

Maritrans, Inc. - Tampa FL

International Classification:

B63B 362

US Classification:

114 65R

Abstract:

An existing single hull vessel is rebuilt to provide a double hull vessel by cutting and removing the topside decking and internal vessel structure of the single hull vessel and inserting an inner hull structure within a volume defined by the original hull. The original hull defines an exterior (outer hull) of the rebuilt double hull vessel and the inner hull defines an interior cargo carrying volume and forms a boundary in the event that the outer hull is penetrated. In addition, a trunk structure, raised deck, and lower bulkhead portions may be used to prevent the loss of cargo carrying capacity due to the new double hull. The double hull covers at least the length of the cargo carrying section of the vessel along the bottom and sides of the cargo section. This method of internal double hulling results in the original vessel structure being reused to the maximum extent possible, and the major exterior dimensions and outer hull hydrodynamic characteristics of the vessel remaining substantially the same after the process of double hulling is complete.