Marine service International AS

What Marine service International AS does

Marine Service International AS (MSI) is a privately held Norwegian-domiciled industrial services company, wholly owned by the U.S.-based Muehlhan Group, that delivers on-station and in-voyage repair, maintenance, and life-extension services to offshore oil and gas operators and maritime shipping fleets worldwide. The company's core capability is bringing shipyard-grade capabilities directly to operating assets — FPSOs, FLNGs, FSUs, production platforms, drilling installations, and commercial or cruise vessels — eliminating the need for dry-docking or production shutdowns. Service delivery rests on a fleet of 25+ ultra-high-pressure (UHP) water blasting machines and over 100 trained UHP operators organized into multi-skilled teams certified to STCW and BOSIET/HUET standards, enabling simultaneous execution of blasting, welding, pipefitting, coating, rope access, tank cleaning, and steel repairs in isolated environments.

The technology stack is anchored by UHP cold-cutting (capable of cutting steel up to 50mm without hot-work permits or gas-freeing), class-approved SPS overlay structural reinforcement, NORM decontamination, and DNV-certified welding procedures. MSI holds ISO 9001 certification since 2004, ABS approvals for Non-Destructive Examination, Hull Gauging, and Enhanced Survey Program (ESP) Hull Gauging through its U.S. subsidiary Trussco, Inc., and is an IRATA International Operator Member and SPRAT certified. The company operates from seven countries — Denmark (HQ), Norway (registered office), USA (Trussco, Louisiana), Brazil, Poland (fabrication facility in Gdynia), Equatorial Guinea, Guyana, and Nigeria (fabrication facility in Port Harcourt) — and has completed over 500 projects involving millions of square meters of steel repair and protection.

Revenue is generated through project-based professional services contracts priced per scope, duration, and equipment utilization, with no resellers, distributors, or marketplace channels. Customer segments span offshore oil and gas operators (primary), shipping fleets (primary), and onshore industrial operators in the Gulf Coast region (secondary). End customers include major oil companies and Petrobras (logo client). Pricing for deployed personnel is structured around competitive hourly pay, overtime, sign-on bonuses, and benefits, with 14/7 rotation patterns available for offshore work.

Name

Marine service International AS

Legal name

MSI AS

Website

https://msi.no

Company type

Private

Founded year

1995

Operating status

Operating

Headcount range

1–10 employees

Short description

Marine Service International AS, a Muehlhan Group subsidiary, delivers on-station and in-voyage repair, maintenance, and life-extension services to offshore oil and gas operators and shipping fleets worldwide using UHP blasting, multi-skilled certified teams, and class-approved steel and coating procedures.

Ownership category

akta.pro rank

Product category

Marine and Offshore Maintenance Services

NAICS

Ship Building and Repairing (336611), Support Activities for Water Transportation (4883), Other Support Activities for Water Transportation (48839)

SIC

Ship & Boat Building & Repairing (3730), Oil & Gas Field Services, Nec (1389)

akta.pro primary industry

Hull & Structural Repair (Steel/Aluminum, Plate Renewal, Coatings Prep) (TLAHAMAB)

akta.pro secondary industries

Hull, Structure & Steelwork Repair (TLAKAKAE), Underwater Inspection, Maintenance & Repair (UWILD, Diving/ROV, In-water Cleaning) (IMAJAFAJ), Piping, Valves & Pumps (Deck/Service Systems Components) (IMAJAIAI), Piping, HVAC & Auxiliary Systems Repair (TLAKAKAH)

Keywords

• Offshore repair services
• Marine maintenance services
• Ship repair services
• Corrosion remediation services
• Surface preparation services

Headquarters

HQ city

Drøbak

HQ country

Norway

HQ region

Europe

Offices8 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Supply Chain, Technology or R&D, Infrastructure, Marketing or Sales

Revenue model

1. Offshore Repair and Maintenance Services: Professional services revenue from on-station structural repairs, in-voyage repairs, steel repairs, tank cleaning, coating application, and mechanical services delivered at customer locations globally. Charged based on project scope, team deployment duration, and specialized equipment utilization.
2. Personnel Staffing Services: Deployment of multi-skilled technicians including cleaning techs, blasters/painters, and rope access specialists. Compensation includes competitive hourly pay, sign-on bonuses, and benefits packages for deployed personnel.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Marine Service International AS provides on-station and in-voyage repair, maintenance, and life-extension services for offshore oil and gas installations and commercial vessels worldwide. The company specializes in structural steel repairs, ultra-high-pressure (UHP) water blasting, coating application, tank cleaning, NORM decontamination, pipe repairs, mechanical services, and rope access work delivered by multi-skilled teams certified to maritime (STCW) and offshore (BOSIET/HUET) standards. Its US subsidiary Trussco, Inc. supports Gulf of America operations including environmental cleaning, corrosion inspection, and ABS-certified inspection services.

Product overview

Marine Service International AS, operating alongside its US subsidiary Trussco, Inc. (both part of the Muehlhan Group), provides a unified portfolio of marine and offshore repair, maintenance, and life-extension services. The offering is organized as a service company rather than a software platform: MSI delivers offshore repairs to FPSOs and production platforms globally, while Trussco focuses on Gulf of America environmental cleaning, corrosion remediation, and inspection services. Key specialized services include Ultra-High-Pressure (UHP) Blasting (with 25+ machines and 100+ operators), Steel Repairs and Renewals, SPS Overlay, Coating Services, Tank Cleaning, NORM Removal, Rope Access Services, Mechanical and Construction, Pipe Repairs, UHP Cutting, Corrosion Remediation, and Scaffolding. All services are delivered by multi-skilled teams certified to maritime (STCW) and offshore (BOSIET/HUET) standards. HSEQ management underpins all operations, with MSI accredited to ISO 9001.

Differentiator

Problem solved

Functional benefit

Products and services

• Offshore Repairs Repair and life-extension services delivered to offshore oil and gas installations worldwide, specializing in FPSOs and production platforms. Services include de-mucking, NORM removal, mechanical and construction, cleaning, scaffolding, blasting, coating, steel repairs, pipe repairs, insulation, asbestos removal, and rope access services performed while assets remain on-station.
• In-Voyage Repairs Cost-effective maintenance and repair services delivered to vessels en-route without interrupting operations. Includes tank preparation, UHP and grit blasting, coating, steel repairs, SPS overlay, and UHP cutting performed while vessels are in transit.
• Ultra-High-Pressure (UHP) Blasting UHP blasting with fresh water for surface preparation, largely replacing grit blasting for offshore use. MSI operates a fleet of 25+ UHP machines designed for onboard use with over 100 trained UHP operators, supporting projects of any size worldwide.
• Coating Services Professional spray-painting and coating application services for onboard repairs, including internal tank linings, deck coatings, and fireproofing systems such as Pit Char and Chartek, with experience from coating repairs on over 500 vessels.
• Steel Repairs and Renewals Class-approved steel repairs to all onboard structures, from welding cracks to cropping and replacing steel inserts. Includes hundreds of tons of steel replaced in tanks without interruption to vessel operations.
• SPS Overlay (Structural Plate System) Structural reinforcement using steel plate systems approved by all major classification authorities as an alternative to crop-and-replace construction, particularly for main decks or hull plating below the waterline.
• NORM Removal Large-scale Naturally Occurring Radioactive Materials removal projects including cargo tanks and topside installations at sea. Services include expert surveying, sampling, laboratory analysis, decontamination, tubular cleaning, waste minimization, and mobile unit support.
• Tank Cleaning Thorough, swift on-site tank cleaning services using high-pressure water (typically heated) and environmentally friendly degreasing chemicals to prepare areas for repairs to hot-work standards.
• Rope Access Services Industrial rope access services enabling safe, efficient offshore blasting, painting, and mechanical support while minimizing scaffolding needs. Includes UHP blasting, internal tank linings, deck coatings, fireproofing, and construction support.
• Mechanical and Construction Services In-service mechanical and construction solutions using rope access and conventional methods including decommissioning, structural welding, pipefitting, complex rigging, cold cutting, flange facing, cable tray installation, insulation, and NDT inspections.
• Pipe Repairs and Installations Repair, replacement, and installation of hydraulic and pneumatic lines, cargo heating systems, and process piping using UHP water cold-cutting without hot-work permits. Fabrication of pipe sections and steel structures from facilities in Gdynia, Poland and Port Harcourt, Nigeria.
• UHP Cutting Cold-cutting steel onboard for access, cropping, or removal using UHP water. Capable of cutting piping, profiles, and steel plate up to 50 mm thick efficiently without cleaning or gas-freeing requirements.
• Corrosion Remediation Corrosion remediation including sand, hydro, soda, and garnet blasting; at-height rope access; UHP equipment up to 40K PSI; and inspection and coating services for industrial projects across the Gulf Coast region.
• HSEQ Management System Comprehensive health, safety, environment and quality management system ensuring protection of personnel, minimizing environmental impact, and delivering outstanding service. MSI is accredited to ISO 9001 with worldwide activities conducted in compliance with relevant legislation.
• Scaffolding Services Erection of scaffolding for tank internals and external maintenance access, including systems for hull repairs above waterline, accommodations, and engine casings.
• Trussco Offshore Environmental Services US-based subsidiary (Carencro, Louisiana) delivering offshore environmental cleaning, inspection, remediation, and paint/coating solutions to Gulf of America operators, including deepwater operations. Holds ABS certifications for NDE, Hull Gauging, and ESP Hull Gauging.
• Multi-Skilled Team Deployment Hand-picked, multi-skilled teams of welders, pipefitters, hydro-blasters, and spray painters certified to STCW standards for in-voyage work and BOSIET/HUET for offshore operations, capable of working independently in challenging environments.
• Environmental Cleaning Comprehensive environmental cleaning services for boats, barges, drilling rigs, production platforms, including NORM projects, rig pit cleaning, tank and vessel cleaning, and spar hull inspections as part of turnkey offshore environmental solutions.

Quantifiable outcome

• 500+ projects completed worldwide with millions of square meters of steel repair and protection
• +3 more outcomes

Named customers7 records

Segments3 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

Six partnerships are on record, tiered core and minor.

• American Bureau of Shipping (ABS)coreStrategic or Co-development PartnerTrussco is ABS-certified as approved service supplier for Non-Destructive Examination (NDE), Hull Gauging, and Enhanced Survey Program (ESP) Hull Gauging. This enables Trussco inspection data to be accepted directly by ABS surveyors for classification and statutory compliance.
• IRATA InternationalcoreStrategic or Co-development PartnerMarine Service International AS is an Operator Member of IRATA International, the world's leading authority on industrial rope access. This membership provides access to industry standards, training frameworks, and safety protocols for rope access operations.
• Society of Professional Rope Access Technicians (SPRAT)coreStrategic or Co-development PartnerTrussco holds SPRAT certification through SPRAT, which sets industry standards for industrial rope access safety and training in the United States. Ensures rope access activities follow current SPRAT guidelines.
• AvettaminorStrategic or Co-development PartnerCertified network supplier member. Avetta provides contractor prequalification and compliance management services for enterprise clients.
• JQS (Joint Qualification System)minorStrategic or Co-development PartnerCertified network supplier member. JQS provides contractor qualification and certification services.
• DNVcoreStrategic or Co-development PartnerMSI has maintained ISO 9001 certification with DNV since 2004/2008. DNV provides quality management certification and welding procedure certifications in accordance with ISO 9001.

Scale indicators7 records

Recent moves3 records

Expansion highlights5 records

Market position

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/marine-service-international-as

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles11 records

Subsidiaries5 records

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 Marine service International AS