Modern oil and gas projects are becoming increasingly complex: requirements for safety, precision of engineering solutions, equipment quality, and cost control continue to rise. In these conditions, it is important to use an approach that allows companies to manage risks, ensure transparency, and achieve high implementation efficiency. One of the most convenient and flexible formats is EP+M (Engineering — Procurement — Management/Montage).
EP+M integrates engineering, procurement, and project management into a single sequential system that covers the entire lifecycle of a facility—from concept to commissioning. This approach is frequently used in the construction of process units, production infrastructure, gas-processing facilities, pumping and compressor stations, as well as energy and industrial installations.
The Essence of the EP+M Approach
EP+M represents a set of activities that include:
E — Engineering
Development of engineering solutions, calculations, specifications, and documentation.
P — Procurement
Ensuring the supply of materials and equipment, as well as managing quality and logistics.
M — Management / Montage
Project management, construction oversight, installation of engineering systems, quality control, and final testing.
This approach allows the client to maintain control over the project while enabling contractors to ensure professional execution of engineering and construction work.
Engineering: Basic Principles of Design
Engineering is the starting point that determines the safety and efficiency of the future system.
Operating Conditions Analysis
Engineers evaluate:
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operating pressure and temperature;
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chemical aggressiveness of the medium;
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load cycles and risk of pressure surges;
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vibration and stability requirements.
Stress Analysis and Modeling
Calculations include:
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strength (longitudinal and hoop stresses),
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bending, vibration, and support reactions,
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thermal expansion behavior,
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emergency scenarios.
International standards are applied, such as:
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ASME B31.3
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ASME B31.1
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EN 13480
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API and ISO requirements
Documentation Development
A complete set of technical documents required for procurement and construction is created. This includes P&IDs, drawings, equipment and material specifications, isometric diagrams, and MTOs. Documentation defines the project’s technical requirements, ensures procurement accuracy, and serves as the basis for installation.
Procurement: Purchasing and Quality Control
Supplier Selection
Suppliers must be qualified and operate according to international standards:
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ASME
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ASTM
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API
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ISO 9001
Quality Control
The following are checked:
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Mill Test Certificates,
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material grade and geometry,
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non-destructive testing results (UT, RT, PT, MT),
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hydrotests.
Logistics and Storage
For high-value materials (stainless steel, duplex, nickel alloys), it is important to ensure:
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proper storage,
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corrosion protection,
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minimized delivery times,
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correct batch completion.
Management / Montage (M): Project Oversight and Installation
Depending on the project, M may mean:
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Management — management of construction, quality, scheduling, risks, and contractors, without performing construction work directly.
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Montage/Construction — execution of installation and construction activities, site coordination, contractor supervision, and commissioning.
Companies select the appropriate model based on internal capabilities and desired distribution of responsibilities.
Where EP+M Is Most Effective?
EP+M is widely used in:
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construction and modernization of oil and gas processing plants;
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field development projects;
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pumping and compressor station construction;
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energy facilities (thermal, steam, electrical systems);
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industrial process complexes;
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engineering infrastructure and auxiliary systems.
This approach is especially effective when high-quality engineering must be combined with flexibility in execution and cost control.
Conclusion
EP+M is a flexible and structured approach that enables effective implementation of complex oil and gas projects. It combines engineering expertise, competent procurement, and professional construction management, ensuring reliability, budget transparency, and predictable timelines.
Thanks to the balance between client control and contractor responsibility, EP+M has become an optimal model for projects where safety, flexibility, and risk minimization are critical.
