International Ship Repair & Marine Services

What International Ship Repair & Marine Services does

International Ship Repair & Marine Services, Inc. (ISR) is a privately held, full-service shipyard founded in 1973 and headquartered on a 25-acre site at 1616 Penny St. in Tampa, Florida's Port of Tampa. The company delivers ship repair, conversion, and marine services to commercial ocean-going vessels, U.S. Coast Guard (USCG) government ships, and mega yachts, with documented throughput of approximately 150 vessels per year. Its core offering spans drydocking, topside and emergency repair, ship conversion (including lengthening, re-powering, and mid-body insertions), electrical services, and round-the-clock emergency response—each delivered as project-based, quote-priced engagements.

ISR's underlying technology is physical industrial infrastructure rather than software. The yard operates the largest number of drydocks in Florida: DD#7 (6,000 T lift), DD#8 (600 T), DD#9 (17,600 T), DD#10 (22,000 T), and the combined Panamax DD#9/10 (39,600 T lift, 843 ft length over blocks). Supporting capital assets include a 275-ton Manitowoc crawler crane, multiple yard cranes (165 T, 65 T, 60 T), a 36,000-pound forklift, a 5,000 sq ft machine shop with TIG/MIG welders and lathes, and a floating fleet of barge cranes (125 T) and tug boats (up to 1,200 HP) combined with 50 ex-Navy barges. In 2022, the company was awarded an $880,758 MARAD Small Shipyard Grant to add a plasma cutting table, additional welding equipment, a 20-ton overhead crane, and a high-capacity forklift.

Business model mechanics are project-based professional services: vessels are booked via dedicated drydock inquiry forms and [email protected], work is quoted per project scope, and revenue is generated through service contracts. The customer base spans USCG (preferred repair facility in the Gulf of Mexico), commercial shipping operators documented by named vessels (MV American Victory, Seabulk Arctic, NOAA Gordon Gunter, etc.), barge operators, and the newer mega yacht segment. Distribution is direct B2B field sales with no resellers, supplemented by a Port Engineer Guide PDF and a 24-hour emergency service hotline. The company is BBB accredited and OSHA-compliant with Shipyard Industry Standards. Following the July 18, 2022 passing of sole owner George H. Lorton, the current ownership structure and leadership succession have not been publicly disclosed.

Name

International Ship Repair & Marine Services

Legal name

International Ship Repair & Marine Services, Inc.

Website

https://internationalship.com

Company type

Private

Founded year

1973

Operating status

Operating

Headcount range

101–250 employees

Short description

International Ship Repair & Marine Services is a 50-year-old full-service shipyard in Tampa, Florida operating five drydocks (including Panamax-class) and serving commercial vessels, the U.S. Coast Guard, and mega yachts across the Gulf of Mexico and Caribbean.

Ownership category

akta.pro rank

Product category

Marine Ship Repair Services

NAICS

Ship Building and Repairing (336611), Ship and Boat Building (33661)

SIC

Ship & Boat Building & Repairing (3730)

akta.pro primary industry

Commercial Ship Repair & Drydocking (TLAKAKAA)

akta.pro secondary industries

Emergency/Expeditionary Repairs & Afloat Maintenance (Voyage Repairs) (IMAJAFAK), Mechanical Systems Repair (Engines, Propulsion, Pumps) (TLAKAKAF), Electrical, Automation & Control Systems Repair (TLAKAKAG), Piping, HVAC & Auxiliary Systems Repair (TLAKAKAH), Naval & Government Vessel Maintenance & Modernization (TLAKAKAB)

Keywords

• Ship repair services
• Marine vessel maintenance
• Floating drydock services
• Ship conversion services
• Commercial shipyard

Headquarters

HQ city

Tampa

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Infrastructure, Supply Chain, Marketing or Sales

Revenue model

1. Ship Repair Services: Full-service ship repair for ocean-going vessels including drydocking, topside repairs, infrastructure repairs, and electrical services. Services government vessels (USCG), commercial vessels, and mega yachts. Revenue generated through project-based contracts.
2. Ship Conversion Services: Conversion capabilities including lengthening and re-powering of ships. Completed notable 890-ton mid-body conversion project in 78 days. Project-based professional services revenue.
3. Special Projects: Large-scale special projects including mid-body conversions, major steel replacement, and emergency repairs. Fast-track capabilities demonstrated with 11+ tons per day steel replacement rate.
4. Government Contracts: Preferred repair facility for USCG in Gulf of Mexico. Awarded 2022 MARAD Small Shipyard Grant for capital improvements.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels4 records

Core offering

International Ship Repair & Marine Services is a full-service Tampa-based shipyard that provides ship repair, drydocking, topside and emergency repairs, and ship conversion (lengthening and re-powering) for ocean-going vessels. Services are delivered to commercial shipping operators, the U.S. Coast Guard, mega yacht owners, and barge operators, and are supported by five floating drydocks (including Panamax capacity), heavy lift cranes, a 5,000 sq ft machine shop, and a fleet of tugs and barges.

Product overview

International Ship Repair & Marine Services is a full-service shipyard offering a unified portfolio of ship repair, conversion, and marine services. The core offering spans government vessel repair (USCG preferred facility), commercial vessel repair, emergency 24-hour repair services, topside repairs, mega yacht services, and special projects including mid-body conversions. These services are supported by substantial infrastructure including multiple drydocks (ranging from 600 T to 39,600 T lift capacity), berthing facilities (over 4,000 feet total), a 5,000 sq ft machine shop, and extensive shore and floating equipment including crawler cranes up to 275 tons and tug boats up to 1,200 HP. The company recently expanded its capabilities through a 2022 MARAD Small Shipyard Grant enabling new plasma cutting, forklift, crane, and welding equipment.

Differentiator

Problem solved

Functional benefit

Products and services

• Government Vessel Repair Services Ship repair and maintenance services delivered to U.S. Coast Guard (USCG) vessels under preferred repair facility status in the Gulf of Mexico. Covers drydocking, topside repairs, infrastructure repairs, and electrical services for government vessels.
• Commercial Vessel Repair Services Full-service ship repair for ocean-going commercial vessels of various sizes, including welding, pipefitting, shipfitting, painting/coating, machining, marine electrical, and crane operations. Targets commercial shipping operators trading through the Gulf of Mexico, Caribbean, and Latin America.
• Emergency & Topside Repair Services 24-hour emergency repair services for ships, vessels, and tug barges, including vessel infrastructure and electrical services. Backed by approximately 3,000 feet of topside repair facilities separate from the main drydock yard.
• Mega Yacht Services Repair and maintenance services for mega yachts visiting the Tampa area, allowing owners to enjoy the locale while vessels are being serviced.
• Special Projects (Mid-Body Conversions) Large-scale ship conversion special projects, including midship (mid-body) conversions, major steel replacement, and re-powering of ships. Demonstrated execution of an 890-ton conversion in 78 days for Gulf Coast Transit.
• Drydock Services Floating drydocking services using five operational drydocks (DD#7 at 6,000 T, DD#8 at 600 T, DD#9 at 17,600 T, DD#10 at 22,000 T, and combined DD#9/10 Panamax at 39,600 T). Capable of drydocking vessels up to Panamax class size.

Quantifiable outcome

• 890-ton mid-body conversion completed in 78 days (11+ tons per day)
• +3 more outcomes

Named customers19 records

Segments5 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

One partnership is on record.

• Padgett-Swann Machinery CompanyminorOthers · 1 January 1990Related company under common ownership with International Ship Repair. Located in Tampa Bay area. George Lorton's additional company providing machinery services.

Scale indicators9 records

Recent moves10 records

Expansion highlights5 records

Direct peers

• Quality Shipyards: Louisiana-based operator of floating drydocks providing ship repair and conversion services. Comparable independent repair yard with overlapping Gulf Coast customer base.
• Vigor Industrial: Major U.S. ship repair and conversion operator with yards in Portland, OR and other locations. Comparable comprehensive ship repair and conversion services for government and commercial vessels, though primarily Pacific Northwest.
• Signal International: Gulf Coast ship repair and construction company operating in Mississippi and Texas with multiple drydocks. Directly competes for offshore supply vessel and commercial ship repair contracts in the Gulf of Mexico.
• East Coast Repair & Fabrication: Norfolk, VA-based ship repair company providing drydocking, topside repair, and fabrication for Navy and commercial vessels. Comparable mid-sized independent repair yard competing for Atlantic Coast government and commercial work.
• Conrad Shipyard: Louisiana-based shipbuilder and ship repair facility with floating drydocks serving commercial and government customers. Overlaps in Gulf of Mexico repair market and Jones Act vessel work.
• Detyens Shipyards: Independent shipyard in Charleston, SC providing ship repair, conversion, and drydocking for commercial and government vessels. Comparable independent, mid-sized repair yard competing for similar Atlantic/Caribbean trade.
• Bollinger Shipyards: Large Gulf Coast shipyard operator based in Louisiana with multiple drydocks and fabrication facilities serving commercial, government, and offshore markets. Competes for Gulf of Mexico vessel repair and conversion work.
• BAE Systems Ship Repair: Operates Jacksonville, FL and other Southeast U.S. shipyards providing drydocking, repair, and modernization for USCG, Navy, and commercial vessels. Direct competitor in the Florida Gulf/Southeast repair market with overlapping government and commercial customer base.

Emerging players

• Cianbro: Heavy industrial construction and marine services firm with shipyard capabilities in the Mid-Atlantic region. Partial overlap in marine repair and fabrication services with growing capability in vessel work.

Regional players

• Bayonne Dry Dock & Repair Corp: Mid-Atlantic ship repair facility performing drydocking and topside repairs. Comparable service offering but concentrated in the Northeast/mid-Atlantic rather than the Gulf of Mexico.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/InternationalShipRepair
• LinkedInlinkedin.com/company/7073582

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about International Ship Repair & Marine Services