Offshore Maintenance Services
At Mod Offshore, we deliver comprehensive maintenance, inspection, and recertification services to ensure the continuity, safety, and efficiency of offshore operations.
From drilling vessels to subsea systems, we operate in full compliance with OEM (Original Equipment Manufacturer) standards and international classification requirements.
Whether above or below the surface, we help our clients reduce downtime, extend equipment lifespan, and maintain certification continuity across all offshore assets.
Riser Systems
Riser systems are among the most critical components of offshore drilling and production operations.
At Mod Offshore, we provide end-to-end riser maintenance and certification services designed to preserve system integrity, meet class requirements, and ensure long-term operational reliability.
By combining engineering precision with field expertise, we successfully manage complex riser maintenance and overhaul projects both onshore and offshore.
Riser Maintenance & Overhaul
We clean, inspect, and repair riser assemblies to maintain their structural integrity and pressure resistance.
Our operations include mechanical disassembly, non-destructive testing (NDT), ultra-high-pressure (UHP) cleaning, and reassembly performed according to international standards.
Riser COC & Certification Services
We conduct Certificate of Conformity (COC) processes to verify that riser systems fully comply with international offshore safety and performance standards.
Through independent inspection, engineering evaluation, and complete documentation support, we deliver a comprehensive certification process covering all pre- and post-operation requirements.
Buoyancy Maintenance
Buoyancy modules are essential for maintaining balance and stability in riser systems, ensuring safe deepwater operations.
We provide inspection, repair, surface protection, and reassembly services to sustain performance and reliability.
Offshore Equipment & Subsea Systems
At Mod Offshore, we provide comprehensive maintenance, inspection, and recertification services for subsea systems and topside equipment used in offshore drilling and production operations. Our scope covers FlexJoint™, conductor systems, wellhead assemblies, connectors, control systems, and various surface equipment ensuring safe, reliable, and uninterrupted offshore performance.
In this scope, we maintain the structural integrity of equipment operating under harsh marine conditions and ensure long-term operational reliability.
Scope of Services
- Performing visual and dimensional inspection of subsea structures
- Conducting NDT and pressure verification for wellhead and connection systems
- Refurbishing FlexJoint™, conductor and hub components in accordance with OEM-approved procedures
- Providing mechanical and functional support for subsea well control equipment
- Delivering non-invasive performance checks and verification for BOP control systems
- Performing detailed mechanical inspections for drilling package components
- Executing mechanical maintenance, sealing verification and component replacement on mud system equipment
- Conducting maintenance, testing and operational safety checks for cranes and handling equipment
Through this integrated service approach, we enhance the operational continuity of both subsea and topside equipment—supporting safe, efficient, and high-performance offshore operations.
Non-Destructive Testing (NDT) & Inspection
At Mod Offshore, we provide comprehensive non-destructive testing (NDT) and inspection services to ensure the integrity, safety, and compliance of offshore equipment.
Our certified inspection teams use advanced testing methods to detect defects, verify material conditions, and support preventive maintenance programs.
By combining accuracy, safety, and engineering expertise, we enhance equipment reliability and ensure full compliance with international standards.
Scope of Services
- Ultrasonic Testing (UT): Measures wall thickness and identifies internal defects.
- Radiographic Testing (RT): Detects weld defects and material loss using radiographic imaging.
- Magnetic Particle Testing (MT): Identifies surface and near-surface cracks in ferrous materials.
- Liquid Penetrant Testing (PT): Detects surface-breaking defects in non-porous materials.
- Electromagnetic Testing (ET): Detects surface and near-surface defects in conductive materials and components.
- Visual Testing (VT): Evaluates visible surface conditions and structural integrity.
- Phased Array (PAUT): Detects internal flaws and fatigue cracks, particularly in welds, flanges, and bolted connections.
- Dimensional Inspection: Verifies geometric accuracy and component fit-up.
- Corrosion & Thickness Measurement: Assesses material loss and corrosion progression.
Through our comprehensive inspection programs, we identify potential risks at an early stage, reduce unplanned downtime, and extend the operational life of offshore assets.
Mechanical Maintenance
Mod Offshore delivers comprehensive mechanical maintenance solutions designed to support the reliability, performance, and compliance of offshore drilling, production, and marine operations.
Our service scope covers piping systems, mechanical assemblies, welding repairs, structural restoration, and integration activities executed under offshore-class safety and quality standards.
Onshore Pipelines
Mod Offshore provides certified fabrication, modification, and installation services for onshore piping systems used in drilling facilities, processing areas, and support infrastructure.
By combining engineering expertise, controlled workshop fabrication, and field installation capabilities, we deliver safe, precise, and regulation-compliant pipeline solutions.
Scope of Services
- Fabrication of carbon steel, stainless steel, duplex and CRA piping
- Work readiness checks and field verification prior to installation
- BOM (Bill of Materials) creation and material tracking
- Structure readiness verification for pipe installation
- Spool release management and documentation control
- Onsite piping installation, spool replacement and system modification
- Punch list creation, monitoring and close-out
- Tie-in management and coordination
- Hot work compliance for offshore/onshore operations
- Hydrostatic and pneumatic pressure testing
- Pressure test package preparation
- Weld map creation and full traceability packages
- Flange management and bolt torqueing
- Welding, NDT and dimensional verification
- Commissioning and integration with existing facility systems
By combining offshore field experience with strong engineering capability, we ensure piping systems operate safely, efficiently, and in full compliance with class and regulatory requirements.
Mechanical Fabrication & Installation
Mod Offshore delivers fabrication and installation services for mechanical systems and equipment used in offshore drilling, production and marine operations.
Our capabilities cover structural and mechanical assemblies, precision machining, equipment integration, and commissioning support — all performed under strict offshore quality and safety controls.
We support both new installations and refurbishment projects, ensuring mechanical systems operate reliably under harsh offshore conditions.
Scope of Services
- Fabrication of mechanical and structural components
- Installation of supports, frames, skids and mechanical modules
- Alignment, leveling and equipment positioning
- Welding, machining and dimensional inspection
- Integration with riser, wellhead, piping and topside systems
- Revamp and replacement of aging mechanical equipment
- OEM-compliant repair, refurbishment and certification support
Our mechanical fabrication capabilities help offshore operators enhance operational reliability and extend equipment lifecycle.
Welding & Structural Repair
Mod Offshore provides certified welding and structural repair services to restore the integrity and operational reliability of offshore drilling and production equipment. Our offshore-qualified welders and fabrication teams perform critical repairs in accordance with AWS D1.1, ASME Section IX, API, and DNV welding requirements.
We specialize in structural reinforcement, defect remediation, crack repair, and precision rebuilds of load-bearing and pressure-retaining components exposed to harsh offshore environments.
Scope of Services
- Weld repair of riser, wellhead and conductor interface components
- Structural reinforcement and crack remediation on frames, skids, supports and mechanical housings
- Precision welding of sealing surfaces, grooves, recesses and clamp interfaces
- GTAW, SMAW, FCAW and SAW processes in accordance with qualified WPS/PQR
- Hardfacing, corrosion-resistant overlay and dimensional restoration
- Fabrication and installation of structural brackets, supports and tubular members
- NDT, dimensional control and class-compliant documentation
By combining advanced welding procedures with engineering oversight, we enhance the structural integrity, extend the service life of critical components and ensure full compliance with class and regulatory standards.
Valves
Mod Offshore provides specialized valve maintenance and recertification services for offshore drilling and production systems. We perform teardown, inspection, repair, testing, and certification in accordance with OEM specifications and offshore industry standards.
Scope of Services
- OEM-authorized repair using genuine components
- Teardown, cleaning, inspection, and reassembly
- Hydrostatic and functional pressure testing
- Actuator servicing, calibration, and leak testing
- Machining, sealing-surface restoration, and coating repair
- Recertification and class-compliant documentation
Through Oil States’ globally authorized Piper Valve service network, Mod Offshore ensures rapid turnaround, reduced logistics costs, and consistent OEM-grade quality, securing the long-term reliability and compliance of your offshore valve systems.