A single technical partner across the asset lifecycle — from concept design through fabrication, inspection, maintenance and certification.
Multi-discipline design for marine, offshore, subsea, structural and oilfield equipment — from concept through fabrication support.
View scope SVC / 02Turnkey fabrication of skids, pressure equipment, structural steel, subsea components and process piping.
View scope SVC / 03Overhaul, repair and recertification of wellhead, BOP, valves, pumps, compressors and rotating equipment.
View scope SVC / 04NDT, third-party inspection, rig audit, OCTG, BHA and lifting equipment inspection to API and client standards.
View scope SVC / 05API Q1/Q2, Monogram licensing, ISO management systems, gap analysis and end-to-end certification support.
View scope SVC / 06Certified materials, flow-iron products, safety equipment and skilled short/long-term manpower on demand.
View scopeFrom initial concept and feasibility review through detailed calculation, modelling, drawing, analysis and execution support — for marine, offshore, shipbuilding, civil / offshore structural and oilfield equipment projects.
Feasibility & options review
Calcs, modelling, drawings
FEA, mooring, stability
Class & client review
Fabrication & site support
Our engineers work fluently across the industry's leading analysis, modelling and drafting platforms — allowing us to deliver, review and validate deliverables in the format your project requires.
End-to-end product engineering aligned to API monograms — from reverse engineering and design through calculations, drawings, material review, inspection support and recertification documentation.
| Standard / area | Equipment covered | Typical scope |
|---|---|---|
| API 6A Wellhead, Christmas Tree & Flow Control |
Casing heads & spools, tubing heads, hangers, wear bushings, test plugs, tree caps, bull plugs, single & dual Christmas trees, gate/choke/check/plug/ball/safety valves, flanges, spacer spools, crossovers, ring gaskets, chokes, choke & kill manifolds, mud gate valves, tees and crosses. | Design, development, reverse engineering, calculations, material review, inspection support & recertification. |
| API 16C Choke & Kill Systems |
Manual & hydraulic choke manifolds, kill-line assemblies, high-pressure kill manifolds, hammer unions, flanged ends, hub & clamp connectors, swivel joints, quick-connect couplings, pressure-monitoring equipment, relief & isolation valves, test assemblies. | Pressure-control system design & development, testing support and certification packages. |
| API 17D Subsea Wellhead & Valves |
Subsea wellhead systems, casing hangers, tubing hangers, running tools, wear bushings, lockdown sleeves, gate valves, choke valves, check valves and isolation valves. | Subsea product development, engineering review and technical documentation. |
| API 4F Drilling Structures |
Drilling, portable, mast-type & heavy-duty offshore derricks, land-rig derricks, crown platforms, monkey boards, escape systems, ladders, rail systems, rig skids and pipe-handling structures. | Structural verification, third-party inspection, FEA support and compliance review. |
| API 8C Hoisting & Handling Tools |
Traveling & hook blocks, integrated hook/block assemblies, swivels, crown blocks, sheaves, deadline anchors, drill/safety/elevator hooks, elevators, slips, rotary components, tongs, riser handling & subsea lifting equipment. | Inspection, design review, load-path assessment, repair support and recertification. |
Turnkey fabrication from concept to finished product across marine, oil & gas, power and process industries.
Engineering, equipment manufacturing and fabrication for a broad range of industries — uniquely qualified to take your product from design to finished product with a single accountable partner.
A qualified manufacturer of a wide range of process equipment and industrial skid packages — engineered, fabricated and factory-tested to client specification.
Repair, overhaul and recertification of oilfield equipment, rotating machinery and process piping.
Repair, refurbishment and recertification services for a comprehensive range of oilfield equipment.
We also carry out repair, assembly and testing of tree blocks, flanges, DSAs, clamps, diverters and master valve bodies, with service support for BOP stacks, elevators and compressors.
Custom fabrication for carbon, chrome, stainless and exotic metals — shop and field welding to project specifications, with repair and refurbishment support across processing industries.
All types of compressor repair, servicing and annual maintenance — with 1- and 3-year service agreements to cover ongoing operational needs.
Pumps (centrifugal & reciprocating), compressors, steam turbines, motors, diesel engines, heat exchangers, safety & control valves and instrumentation.
Experienced field engineers & technicians for planned and emergency breakdown maintenance — fast turnaround on off-site repairs and minimised unplanned downtime.
Accurate, traceable calibration and Portable Appliance Testing delivered at your site.
Alongside our repair scope, Subseazen manufactures and supplies a comprehensive range of associated products, plus engineering support for a wide range of rotating machinery and auxiliary equipment from major OEMs.
End-to-end inspection support for drilling, completion and production operations — NDT, third-party inspection, rig audit and equipment surveillance to API and client standards, with certified inspectors and a full NDT service line.
Rig audit, upstream equipment inspection and reporting per API and client procedures.
UT, DPT, MPT and RT services delivered by qualified NDT technicians — plus ET, VT and welding inspection.
Vendor surveillance, third-party monitoring and independent witness inspection.
BHA and drill-stem tools per API 7-1, 7-2, DS-1 and NS-2 — with full report documentation.
OCTG per API 5CT / 5B plus VAM, Tenaris, JFE and Hunting premium connections, and tubular renovation.
Rig components, handling tools and lifting accessories inspection.
Cranes, loose lifting gear and fire extinguisher inspection.
Repair of valves & instrumentation with recertification documentation.
API monogram certification, ISO management systems and third-party audit support for 150+ clients worldwide.
A market leader providing a complete package of training, consultation and implementation — from application through to your certification.
Operating since 2017 across oil & gas, marine and nuclear industries — supporting both large and small clients at domestic and international levels.
Specialised in API-related projects for 150+ international clients across India, Asia, the Middle East, UK and USA — over 20 countries.
Custom-made training, consultation and third-party inspection tailored to each client's requirements.
End-to-end services for API Q1 / Q2 licences: 6A, 16A, 16C, 5CT, 7-1, 6D, 4F, 8C, 7K and more per client requirement.
ISO 9001 Quality, ISO 14001 Environment, ISO 45001 OH&S, ISO 50001 Energy, ISO 27001 Information Security, ISO 19443 Nuclear and more.
QMS audits, supplier / vendor surveillance and change-of-manufacturing audits with strengths & gaps analysis.
Custom API and ISO training for engineers, auditors and quality managers — classroom, virtual and onsite formats.
Complete package: preparation, training, implementation & certification. Customised API Quality Manuals, procedures, monogram-specific design packages, forms and personnel training — everything needed to implement an effective management system and achieve certification in the shortest lead time. See all the standards we support.
Skilled manpower and a comprehensive catalogue of certified materials, flow-iron products and safety equipment.
Short-term and long-term manpower placement — screened, certified and mobilised to your site or project on demand.
Flexible engagement: contract hire · long-term deployment · turnkey site teams · emergency mobilisation.
A one-stop supply of certified oilfield materials, industrial consumables and electrical / instrumentation products.
Standard-service and sour-gas-service hammer unions and flow-iron products in threaded and butt-weld ends — tested to strict quality parameters, colour-coded per industry standards and WECO inter-changeable. Plus swivel joints, pup joints, crossovers, integral fittings, steel hose assemblies and Lo-torc valves.
Range & pressure ratingsPTFE-sleeved, PFA/FEP-lined plug, ball, butterfly and diaphragm valves for corrosive applications — Class 150#/300#, sight glasses and thermoplastic / fluoropolymer lined pipe & accessories.
Manufacture and supply of fire protection products, PPE and inspection services for industrial, marine and oil & gas assets.
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