Z-Subsea Technical Capability Brochures 


Integrity Management and Engineering (download)
Summary of Integrity Management Capabilities (download)
Engineering Criticality Assessment ECA (download)
Fatigue and FractureTesting and Analysis (download)
Intelligent Pig Inspection Data Analysis and Integrity Assessments (download)
Material Selection, Corrosion Assessment and Protection (download)
Offshore HPHT Pipelines Upheaval and Lateral Buckling Analysis and Design (download)
Design By Analysis for Pipeline Component Design (Wye piece, Tee, Bulkhead, Reducer) (download)
Advanced Free Span and VIV Assessment of Pipelines and Risers (download)
Ship-Jacket Impact Advanced Finite Element Analysis (download)
Life Extension of aged assets (download)
General Capability Statement (download)


selected Clients


Tullow Oil

Oman Gas Company

Petroleum Development Oman

Peritus International DNV    

Neptune Marine Services

Fairlead Maritime






Z-Subsea Projects

Some of the Z-Subsea projects are listed below:


  •     Z-Subsea Material and Integrity team was invited by Oman Gas Company (OGC) to perform an audit of their Integrity Department based in Muscat. Z-Subsea team deployed to Oman and within 2 weeks stay in the country and interviewing 20 OGC key personnel, followed by visits to OGC's 6 gas transportation terminals across the company, and successfully concluded the project on time and to the budget. A final audit report based on the observations recorded by Z-Subsea team member was then prepared and submitted to OGC.
  •     Tee and Wye piece design to ASME VIII Div. 2, in challenging Ultra Deep Water, 2300m water depth offshore Brazil for Petrobras.
  •     Materials/ECA Technical Authority for Tullow Oil TEN project in Ghana
  •     Advising TAQA on Inspection, monitoring and integrity management of 12 J-Tubes within concrete caissons and suggesting mitigation measures.
  •     Tullow Oil -UK: Materials/Welding and integrity consultancy supports to T.E.N project in Ghana
  •     Fairlead Maritime: Dynamic Nonlinear FEM of semi-sub impact to jacket
  •     Neptune Marine Services (Neptune) - Australia: Verifcation and Development of Free-Span and VIV analysis tool
  •     DNV - Middle East: Design verification of topside modification of Bukha-A Platform including piping, process and material disciplines - Oman Oil Company Exploration & Production LLC (OOCEP)
  •     DNV- Middle East: Design verification of subsea pipeline of Musandam Gas Plant Project - Oman Oil Company Exploration & Production LLC (OOCEP)
  •     DNV - Middle East: Preparation of design Performance Standards for onshore pipeline, structures and facilities - PDO
  •     Technical Training Courses: In addition to the consultancy services, Z-Subsea have been involved in Subsea and Materials/Integrity Engineering training courses worldwide. Neptune Marine Services in Australia, PetroVietnam in Vietnam (PVD Training), IBC Asia (Singapore) and L G Lauarent (China) are among Z-Subsea international clients. Recently Z-Subsea and NES Global Talent have also signed an agreement to join force in provision of in-house long term training courses to the oil and gas industry.

Experience of Z-Subsea Personnel

Key Z-Subsea personnel have comprehensive industrial experience and worked for Design Consultants, Independent Verification Bodies and Operators such as J P Kenny, KBR, Xodus Group, Genesis Oil and Gas Consultants, Det Norske Veritas (DNV), Lloyd's Register (LR), TWI Ltd., and Talisman Energy before joining Z-Subsea.


Following summarises their experience while working for the above companies:


Subsea Design:


  • FEED of Jordbaer field development – BG Norge;
  • FEED of Devenick field development – BP Exploration & Operating Company Ltd.;
  • FEED of Flyndre Cawdor field development – Maersk &Talisman Energy;
  • FEED and detailed design of Rev / Varg South gas condensate field - Talisman Energy Norge AS (design verification services);
  • FEED and detailed design of Shah Deniz Stage 2 Risers and J-Tubes – BP;
  • Pre-FEED of West Delta Deep Marine (WDDM) Phase IX Development – BG;
  • FEED and detailed design of Jasmine and Jade development HPHT pipe-in-pipe riser and spools and bulkheads – Conocophillips;
  • FEED of Ptarmigan Field Development, OilExco;
  • Detailed design of Skarv field development – BP Exploration & Operating Company Ltd.;
  • Detailed design of Al-Rayyan Pipeline and PLEM - Occidental Petroleum of Qatar Limited;
  • Detailed design of Lyell pipeline, tie-in spool and flanges- CNR
  • Detailed Design of Galley redevelopment - Talisman Energy (design verification services);
  • Halfdan Notheast Phase 3 filed development – Maersk Oile Og Gas AS (design verification services);
  • Detailed design of Turkey-Greece natural gas pipeline system (Offshore Section) –Petroleum Pipeline Corporation of Turkey (design verification services);
  • Detailed design of Dumbarton field development - Maersk Oil North Sea UK Limited (design verification services);
  • Chestnut field development - Venture Production Company (design verification services);
  • Field lay out Study at Scott PD platform for Rochelle field development.
  • Field layout of West Delta Deep Marine (WDDM) Phase IX Development – BG;
  • Laggan tie-in spool and flange design – Total;
  • Dunbar and Alwyn Pipe-in-Pipe Tie-in spools Design verification – Total.


Integrity Management and Integrity Engineering:


  • Lateral buckling, trawl gear interference and free span assessment of Vesterled and Frigg pipeline system- Total;
  • Lateral buckling assessment of  Total Alwyn North pipeline  system;
  • Pipeline integrity assessment during plug recovery at BP Bruce field;
  • Integrity assessment of a scoured tie-in Spool - Talisman Energy UK;
  • Fatigue failure assessment of fully ruptured topdrive shaft of drilling rig “Eirik Raude”;
  • Development of integrity management procedure for entire subsea system of Huntington Development - E-On;
  • Fitness for service assessment of Triton-Clapham water injection valve skid - PetroCanada UK;
  • Joint industry project (JIP) on treatment of residual stress in ECA of girth welds under high plastic deformation - various operators and EPIC contractors;
  • Corrosion Assessment of Elgin-Franklin gas export riser - Total UK E&P, Aberdeen;
  • Corrosion assessment of Al-Shaheen water injection pipes - Maersk;
  • Life extension study for Dunbar-Alwyn pipe-in-pipe - Total UK;
  • Corrosion Assessment for PL488/15S pipeline - Total UK;
  • Fracture characterisation and defect assessment of Sakhaline II 14” girth welded pipe - Shell;
  • Installation and operation ECA of two offshore pipelines in Otway Australia - Allseas;
  • Fitness for service assessment (to BS7910) and burst testing of damaged 30” oil pipes - Sasol;
  • Mechanical characterisation and ECA of 14” clad girth welded pipes - Saipem UK;
  • Fracture characterisation of 13% Cr high strength steel girth welded pipes - various partners in European project JOTSUP;
  • Madoes manifold, pipeline OOS and flanges design check for temperature upgrade – BP;
  • Terra Nova flexible pipeline upheaval buckling design - Acergy Petro Canada;
  • Assessment of manufacturing defect at west sole pipeline for burst pressure;
  • Assessment of Jasmine HPHT pipe-in-pipe riser for burst under well head shut-in pressure WHSIP – Conocophillips;
  • Span assessment of more than 200km pipelines for Armada, east and west Shetland pipelines;
  • Farragon and Goosander FE modelling of bundled Pipe-in-Pipe systems for pipeline expansion check.