HOME | ABOUT | SURVEYING | BID DOCUMENTS | CONSTRUCTION DRAWINGS | WRITING | EMAIL US
|
HOME | ABOUT | SURVEYING | BID DOCUMENTS | CONSTRUCTION DRAWINGS | WRITING | EMAIL US |
|
BID SPECIFICATIONS FOR THE DRYDOCKING AND REPAIR OF THE SHIP WAVERTREE. 14 May 1998 It is the intent of these specifications to describe the scope of work and procedures to be followed for the preparation, coating, hull repairs and other items to the ship WAVERTREE, owned by the South St. Seaport Museum, 207 Front St., NY, NY 10038.
Delivery of the vessel to the Contractor’s yard facility shall be the responsibility of the Owners and will be performed under a separate contract. The Owner’s Representative shall have access to the WAVERTREE at all times. In addition, the naval architects will require access to the ship for work under a separate contract with the Owners. It is expected that this work will take several days and will take precedence over other work being performed. Seaport personnel may be required to work aboard the WAVERTREE. Their work shall not impede or delay work being performed by the contractor. The New York State Office of Parks, Recreation and Historic Preservation is funding part of this project. The South St. Seaport Museum and the Contractor are required to provide complete and accurate records of labor, service, supplies, equipment, material and all other items furnished for the project to comply with EEO policy.
Description of the WAVERTREE Length (including bowsprit) --------------------------- 320’ Length on deck --------------------------------------- 263’ Length BBP------------------------------------------- 279’ Beam ------------------------------------------------- 40.2’ Gross tonnage ---------------------------------------- 2170 Present draft fwd ------------------------------------- 10’6" Present draft aft -------------------------------------- 11’9" Present displacement ---------------------------------- 2700 LT Hull frames are numbered from aft to forward. The collision bulkhead is located at frame 122. Two partial, non-original bulkheads are located at frames 41 and 91.
BID ITEMS
1. TEMPORARY SERVICES
2. DRYDOCKING Note: The Contractor is advised that the WAVERTREE has a full length bar keel that projects 10" below the base line. It is suggested that precautions are taken to protect the centerline keel blocks from damage. The Owner shall not be held liable for such damage. The Contractor shall insure that the WAVERTREE is carefully raised and receives maximum support from keel and bilge blocks. The Contractor shall carefully shift bilge blocks to treat all previously inaccessible areas of the hull. No more than one bilge block shall be removed at a time to perform this work. Immediatly upon treating the shell plating the bilge block is to be re-fitted with appropriate keys and wedges. A full bearing of the bilge block shall be achieved before removing the next bilge block. The Contractor will be given all available data and a copy of the midship section of an identical sister ship, the ALLERTON. The bid price of this item shall include all lay days required to complete the work described, including contingency items which may be awarded. The Owners shall not be charged for lay days incurred due to inclement weather which may prolong the work. The Contractor shall dispose of all waste material generated by the work at no additional cost to the Owners.
3. SANDBLAST AND COAT BOTTOM There are no existing coatings on the underwater hull. The estimated area for bid purposes is approximately 15,400 sq. ft. to the 16’ waterline. After cleaning the bottom of marine growth sand blast to near white metal (SSPC-SP10) a 6 sq. ft. area of the bottom to be inspected by the Owner’s Representative and the Coating Manufacturer’s Representative. It is anticipated that heavy pitting exists in the surface profile of the plate and particular attention should be given in thoroughly preparing plate surfaces, edges, lands, rivets, rudder and fittings. All grit and dust shall be removed from prepared surfaces prior to painting. While the shell plating is bare the Owner’s Representative may take gage readings in selected areas of the hull.
4. COATING SCHEDULE The coatings shall be applied according to the Manufacturer’s specifications. The primer coat shall be applied the sme day as sandblasting. From the keel to the 16’ waterline apply one thinned coat of Devoe Bar rust 230, thinned 10-15% or as per Manufacturer’s instructions, to allow thorough penetration into seams, butts and rivets. In addition to the primer coat apply one full coat of Bar-Rust 230. Following the application of this coat the Owner’s Representative will inspect the hull and determine the extent of hull repairs and the use of epoxy fillers. Following hull repairs, 2 full coats of Devoe 230 shall be applied as final top coats. Contrasting shades should be used. Total thickness should exceed 30 mils (dry). No anti-fouling paint will be applied.
5. TOPSIDES Estimated total area is approximately 10,000 sq. ft. Heavy pitting exists in the plate surface. Sand sweep a 6 sq. ft. area for inspection by the Owner’s Representative and the Coating Manufacturer’s Representative. Upon inspection it may be determined that the topsides from the 16’ WL to the top of the bulwarks will require sandblasting to near white metal (SSPC-SP10). Areas peviously prepared and painted by Seaport personnel may not require surface preparation other than washing down prior to top coating. Areas blasted to near white metal shall be coated with Devoe 230 primer and topcoat to match the existing color scheme. A darker shade of red shall be used between the 16’ WL and the 22’ WL than between the keel and the 16’ WL Care shall be taken to avoid getting paint on areas inboard of the bulwarks, wood decks, deck furniture and the white painted whaleback at the stern.
6. CONTINGENCY ITEMS Note: Most of the shell plating on the WAVERTREE is wrought iron and can be welded with E60XX and E70XX welding rods. It may be necessary to employ a slightly lower welding speed and reduced current than used with the same thickness of mild steel. Welding stresses shall be kept to a minimum to reduce movement to riveted connections. Some welding may be required on riveted seams adjacent to welded doublers because of welding distortion. Steel plates are installed on strakes "A", "B" and "C", port and starboard, forward of the collision bulkhead. Areas of strake "F", port and starboard, approximately from frames 41-91 also have steel plate installed.
7. DOUBLER PLATES For bidding purposes it is estimated that 1500 sq. ft. of 3/8"(15.3#) A36-74 structural steel plate doublers may be installed on the shell plating below the waterline. Bidding is on a per pound basis. Before installation the doublers shall be coated on the inside with a weldable zinc coating. Doubler plates shall be well fitted with edges parallel to existing seams and butts. All welds shall be full and complete with leg, throat and groove dimensions appropriate to the plate thickness. If slot welds are needed to keep the plate surfaces in contact they shall be of suitable dimensions (2 ½" X ¾") spaced 12" between centers in both directions. Preheat or radial sequence may be needed. All surfaces to be welded shall be clean and dry, free from rust, oil, mill scale or paint.
8. HULL REPAIR A torn hull plate at frames 13 ½-15, strake "F", starboard side aft, is presently plugged with cement. The damage extends in the butt strap between frames 13-14. Frames 14 and 15 are slightly bent and displaced inboard from the plate. This damage is approximately 40" long and 10" wide. Upon removal of the cement the area will be inspected to determine the method of repair. For bidding purposes it is anticipated that the damaged plate will be cropped back to fair material. The edges of the clear opening shall be ground true and the corners to have a minimum 3" radius. Distorted flanges of the frames will be heated and bumped fair. A shaped welded patch plate will be fitted and continuously welded inside and out. The patch plate hould have a minimum 1 ¾" lap over the original plate. Steel liners may be used to weld the frames to the patch plate. The adjacent seams, butts and rivets may require welding. Bid is estimated at 12 hours at the hourly rate and materials.
9. LOCAL PATCHES Small welded patches may be required at areas of local waste. The estimate for this work is 50 hours at the hourly rate and materials.
10. RIVETS, PITS, SEAMS AND BUTTS It is expected to find numerous wasted rivets, open seams and butts. Rivets which, due to moisture, cannot be filled with Devran 242 or Devran 142 shall be ring welded. Open seams or butts may require welding. For bidding purposes the number of rivets and pits is estimated at 5,000 and 600 linear feet of seams and butts. This work can be done after the first full coat of Devoe Bar-Rust 230 is applied.
11. MISC. HOT WORK Remove all steel straps from previously installed zinc anodes and temporary rudder stops from hull.
12. BLASTING AND PAINTING OF DOUBLERS All doublers, patches, welds and area of damaged coating shall be prepared and treated as stated in these specifications under Item 3 SANDBLASTING and Item 4, COATING SCHEDULE.
13. RUDDER
14. DRAFT MARKS Draft numbers shall be applied at bow, stern and amidships, port and starboard. The style of these numbers shall be determined by the South St. Seaport Museum’s Historian.
15. ACCOUNTING A current billing record shall be made available to the Accounting Dept. of the South St. Seaport Museum. This information may affect or modify these specifications. Prepared for the South St. Seaport Museum by: Charles C. Deroko, Marine Surveyor/Owner’s Representative |
|
HOME | ABOUT | SURVEYING | BID DOCUMENTS | CONSTRUCTION DRAWINGS | WRITING | EMAIL US |
The drydocking and work shall be the responsibility of the
Contractor and careful consideration shall be given to the historic nature of the vessel.
All workmanship shall be of good commercial quality using skilled labor. The Contractor
will provide all necessary equipment to insure proper execution of the work.
The WAVERTREE has a unbalanced, double plate rudder with a wrought
iron frame. Inspection may reveal that the rudder is no longer watertight and the original
filler material wasted in the lower half of the rudder. It may be necesary to drain the
rudder, flush and fill the interior with a non-corrosive coating such as Fluid Film Float
Coat. Welding repairs and filling with Devran 242 will probably be needed. This item is
estimated at 70 hours at the hourly rate and materials.