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USS OlympiaLength

344 feetBeam

53 feetDraft Today

17 feet fwd20.5 feet aft

Displacement In service 5,600 tonsToday 4,780 tonsStability TodayGM 0.67’29 tons/inch immersionCrew

400 enlisted40 officers

Today 5

Speed 22 + knots

Coal capacity 1100 tons

Today EmptyCruising range

2,500 milesArmaments (4) 8” guns (mock-ups) (8) 5” guns (6) on loan, NHHC (10) 6-pounder guns Originally equipment 6 Auxiliary sails

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Over 15 years of Study

• Robert C. Stewart: Historic American Engineering Record: USS Olympia, HAER PA 428

• NAVSEA, Inclining: simple stability test

• Don Birkholtz Jr: drafted Cruiser Olympia; Historic Structure Report

• Dr. Cooling: Olympia: Herald of Empire

• ATC Environmental, comprehensive lead and asbestos evaluations and recommendations

• Robert Jamieson, PE: single compartment floodability standard. Digitized over 300 construction drawings

• Charles C. Deroko, oversaw bulkhead repairs, conducted hull survey, specifications for interim repairs.

• Lawrence Burr, Us Cruisers 1883-1904

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Removed Inappropriate Displays

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Notable Preservation

Projects

• Museum’s boat shop replicated historic pilothouse later installed on the restored forward bridge deck

• Restored multiple areas of ship and reopened to public, including Engine and Boiler rooms

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The Technical Challenges:Leaking exterior decksWatertight integrity of hullExtensive dredging requirements

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Exterior Deck

Multiple leaks

Structurally compromised

•Wood deck dates from before the 1920’s

•Concrete layer added by US Navy, 1945

•Polyurethane membrane added by Museum in 2003 to provide watertight integrity

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Olympia was last hauled in 1945. There are 72 patched holes in her hull to date. Chronic deck leaks contribute to decay of ship’s hull and interior.

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Removal of Olympia from Penn’s Landing basin to effect repairs

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Required for Olympia removal:Dredging 28,000 cu/yds of material

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Stabilization efforts • Removed over 30 tons of asbestos and other contaminates

• Repaired bulkheads to establish single compartment floodability standard

• Installed remote-monitored alarm system with 54 damage control sensors

• Restored watertight integrity to inner bottom tank tops

• Effected interim repairs to damaged areas of the hull in way of wind and waterline

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Interim Repairs

Completed:Internal repairs of

exterior hull over 15% of

waterline area included 32

Welded steel cofferdams

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Cost Summary

Fabrication and Installation of a 700’ X 3’ doubler Belt around the waterline of the USS Olympia

Materials and Consumables: $161,000.00 Mobilization / Demobilization $40, 000.00 Day Rate $15,000.00/day

– @ 200 days $3,000,000.00

Note this is a rough estimate, there are potential savings in equipment rental, material costs. As well as improved production rate based on process improvement.

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Other options considered:

Secure ship in place with cofferdam and cement

•Install double sheet pile wall around the ship and submarine

•Dewater area

•Effect repairs to exposed hull

•Cement or backfill as needed

Note:

Without dredging and relocation of the Submarine Becuna, cofferdam would have to incorporate both Olympia and Becuna

Cement in this quantity is non-reversible

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Cost $2.1 Million ++

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Hull Survey to determined realistic out of water repair costs

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The Road Forward:

Most engineering and planning work is completed

– Conducted stability tests and floodable length studies with US Navy and private contractors

– Completed hull condition survey including over 1400 UT readings

– Drafted tow and repair specifications– Reviewed docking plan with potential contractors

Still required– Reballasting study, required for extended tow– Still water bending moment study,

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With proper preparations Olympia can be carefully towed to a local repair facility and properly supported she is capable of withstanding the spot loading of the dry dock blocking

Summary of Findings: Olympia IS repairable

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Phase IHull Work

Dredging: 6 weeksTow Prep/Block and Prep Dock: 2 monthsTow to dry dock #2 or #3 PNBCHaul Out: 3 months• Hydroblast hull• Install 4’X ½” belt at waterline (700 linear ft)• Visual and UT inspection of entire wetted surface (minimum 3000 shots)• Install additional plating where required up to 10%• Sand sweep• 3 coats type 235 primer (or alternative high build coating)• Additional high build primer at waterline and on keel• LaunchReturn tow

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Phase IIRedecking

• Build Waterproof containment over exterior decks

• Install interior containment to preserve historic fabric

• Remove and preserve historic fittings, including stacks, masts and ventilators

• Remove 7” of exterior coatings, including 70 tons of concrete and 3” original decking

• Repair and recoat steel substructure

• Install prefabricated Teak Deck Systems panels

• Reinstall historic fittings

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Cost of Olympia Preservation($000)

PHASE I- Hull stabilization• Dredging $ 1,000 • Prep, tow, hull work, reballasting (for local tow) $ 4,800

Total $ 5,800PHASE II- Redecking• Exterior containment and deck removal $ 750• Interior containment and fitting removal $ 400 • Steel work $ 400• Rehab and reinstallation of fittings $ 350• Teak Deck System estimate $ 1,500

Total $ 3,400

Envelope Rehabilitation Project Total $9.2 million

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interim repairs to delay inevitable dry docking and redecking