Gas, Oil & Petrochemical Expert Witness Services

Internationally-recognised expert witness engineers with over 75 years of drilling and petroleum refining expertise.

Arbitration Consultants in Petroleum Engineering across 90 countries

We have vast experience in the petrochemicals industry, providing litigation services
to the High Court and International Court of Arbitration.

Our Clients

Our Accreditations

Our Petrochemical
Experience Includes:

  • Crude oil distillation
  • Hydrotreating Gas separation
  • Light ends recovery
  • Fractionation
  • LPG production
  • Storage and handling
  • NGL
  • LNG
  • Sulphur recovery
  • Alkylation
  • Polymerisation
  • Isomerisation
  • Aromatics
  • VCM
  • PVC
  • Polyolefins
  • Polyolefins

Our Expert Witness Services Includes

Expert advice and independent expert opinion

Site and equipment surveys

Process design reviews

Review of construction records

Examing compliance issues

Investigation of process and mechanical design defects, disruptions

Specialist Petroleum Engineering Knowledge

In the oil and gas, petroleum refining, and petrochemical and power generation industries

Process & Mechanical Equipment Design

Specific experience of:
  • Process plant design
  • Piping design and insulation
  • Construction and commissioning of plants in oil / gas processing including wet sour conditioning
  • Cryogenic air separation units
  • Water filtration and deionization
  • Effluent treatment units
  • FCC and hydro cracking units
  • Sulphur recovery units
  • LNG/LPG/NGL plants
  • Ammonia production
  • High pressure gas compression
  • Gas/liquid pipelines and gas/liquid storage tank facilities


Extensive experience both as an owner’s representative and as a contractor, in:
  • Preparing and executing basic design
  • Detailed design
  • Procurement and construction to ISO 9001 Quality Assurance
  • International model forms of contract (FIDIC orange book and similar) of oil and gas production/processing facilities and pipelines, petrochemical and power generation plants.

Design, Engineering & Quality Control

In the manufacturing industries with specific experience of:
  • Welding
  • Forming and machining alloy steels and stainless steels
  • Quality Control and Assurance requirements to ISO 9001/2
  • Assessment of product design and manufacture in respect to assessment of fitness for purpose
  • Production plant and machinery valuations

Gas, Oil & Petrochemical Assignments

UK Oil & Gas Experience:

  • Technical audit on design changes and cost overrun by a contractor on Schlumberger designed produced water filtration skids at a gas processing facility.
  • Reviewed design of LPG/NGL gas refinery in Iran and gave advice on process operating scenarios.
  • Review and update piping standards for GlaxoSmithKline including advice on material compatibility and insulation
  • Feasibility study for gas pipeline and gas conditioning units to supply to new power station in Nigeria on behalf PKF accountants
  • Prepared expert report of Costain Oil and Gas on the failure of a temporary strainer in the suction line to main gas compressor (13 MW) at National Grid compressor station, work involved fatigue analysis and vibration analysis due to high gas flow rates.
  • Bishop Auckland to Tafforth pipeline 42" diam. erection and commissioning of pig trap installations.

Worldwide Oil & Gas Experience:

  • Preparation of process and instrumentation diagrams for all onshore crude oil/gas separation facilities incorporating new plant and equipment.
  • Over a period of 18 years Manderstam designed and assisted in the operation of refineries, NGL plants and oil and gas distribution and loading systems for the Qatar General Petroleum Corporation.
  • Review of variation claims in respect to the NSRP new refinery in Vietnam, requiring review of preferential design development comments in regard to HAZOP studies and 3-D models.
  • Review and advice on a Gasholder designed to API620 /BS14015 for a major steel mill in Brazil.
  • Carried out a hazard and operability study on behalf of Exxon followed by seconding a team of engineers to the refinery for six months to implement the recommendations.
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"Dear clients and colleagues,

Like all of you, we have been closely monitoring the COVID-19 pandemic since its inception in order to respond as necessary. Our priority is the health and wellbeing of all whom we work with and our wider responsibility of serving our clients. To that end we have implemented a robust, well tested plan which enables us to operate at usual capacity and ensure a high quality service: business as usual in other words.

We wish all our clients good health in these challenging times".

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