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Engineers and EPC contractors do not have a universal refinery-project split. The EPC or EPCM agreement, its scope and exclusions, responsibility matrix, and project execution plan establish who designs, buys, builds, tests, reviews, and accepts the work. The owner sets project requirements and retains governance and acceptance decisions even when it delegates much of execution. To understand what a particular party does, first identify the delivery model, then follow the assigned responsibilities through each phase.
What the delivery model changes
“EPC” means engineering, procurement, and construction, but the label alone is not a complete list of duties. In an EPC arrangement, the contractor carries out the work included in its contracted scope; that scope may also include commissioning, start-up, testing, or other closeout tasks. Which party holds direct equipment and construction contracts, controls subcontractors, and carries particular cost, schedule, performance, or interface risks depends on the agreement.
In EPCM or owner-managed delivery, the consultant commonly manages or coordinates work packages while the owner retains direct contracts with construction and equipment suppliers. A project management consultant (PMC) may also provide owner-side oversight of an EPC contractor. Those roles are not interchangeable: reviewing or monitoring a contractor’s design does not by itself make the reviewer the designer or builder.
| Question | EPC delivery | EPCM or PMC role |
|---|---|---|
| Who performs detailed engineering? | The EPC contractor, for the engineering included in its scope. | An EPCM consultant may coordinate or review design; in a PMC arrangement, the consultant may monitor the EPC contractor’s engineering. The contract sets the boundary. |
| Who buys equipment and materials? | The EPC contractor typically procures items within its scope; owner-furnished items may be exceptions. | The consultant may manage or assist tendering, awards, inspection, expediting, or materials management, while the owner may retain direct purchasing contracts. |
| Who executes construction? | The EPC contractor and its subcontractors execute contracted construction. | An EPCM consultant may manage or supervise construction, but the owner may hold the construction contracts. The consultant’s authority depends on its appointment. |
| Who commissions and accepts the facility? | The contractor may prepare or perform assigned completion, commissioning, testing, and handover tasks. | The consultant may coordinate, assist, review, or witness. The owner typically participates in readiness and makes acceptance decisions assigned to it. |
| Who bears project risk? | Allocation of cost, schedule, performance, and interface risk is agreement-specific. | Allocation is agreement-specific; management or monitoring does not alone establish risk transfer. |
These are typical distinctions, not a substitute for the project’s contract documents. For example, BPCL’s Mumbai Refinery tender distinguishes conventional execution from package execution, with separate scope treatment for the latter. That is why a refinery’s package boundaries can matter as much as the delivery-model label. See the BPCL tender’s execution-mode descriptions.
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How responsibilities usually divide by project phase
1. Define the project and its boundaries
The owner establishes the business need, operating requirements, standards, funding, battery limits, and acceptance criteria. It may provide licensor information or owner-furnished equipment, if assigned. An EPC contractor translates the requirements it has accepted into engineering and execution plans. An EPCM or PMC consultant may facilitate definition, review the basis, and administer change control.
In a refinery brownfield project, tie-ins to operating units, access restrictions, outages, and existing-facility conditions create interfaces that cannot safely be allocated by assumption. Confirm the battery limits and tie-in registers, package boundaries, operating constraints, and interface responsibilities in the project documents.
2. Develop and review engineering
Within its scope, an EPC contractor develops detailed designs and the drawings, specifications, calculations, and other documents needed to procure equipment and to construct, commission, start up, and operate the facility. A filed EPC scope, for example, says: “Contractor shall prepare engineering Drawings and Specifications or other documentation necessary to safely construct, commission, start-up, and operate the Facility.” That is sample agreement language, not a universal legal definition. The same scope lists FEED actions, material take-offs, purchase requisitions, bid reviews, design reviews for integrity, maintainability, operability, and constructability, and EPC-specific HAZOP/LOPA work. See the filed EPC engineering scope.
The owner supplies required inputs and reviews or approves design at the contract’s specified hold points. In EPCM or PMC delivery, a consultant may coordinate engineering or review it for conformity with the contract and approved FEED. The responsibility matrix should distinguish who prepares a document from who reviews, approves, or accepts it.
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3. Procure equipment, materials, and services
An EPC contractor commonly prepares requisitions, evaluates bids, places orders, expedites suppliers, and manages inspection and quality for items in its scope. The owner may retain approval of specified critical awards or provide owner-furnished equipment. Under EPCM, a consultant may run or support tendering, award, vendor-document review, inspection, expediting, and warehouse or materials management, while the owner holds the purchase contracts.
BPCL’s PRFCCU tender at Mumbai Refinery illustrates how broad an EPCM assignment can be: it lists tendering and awards, long-lead and other procurement, vendor-document review, inspection, expediting, quality management, and warehouse/material management among the consultant’s tasks. Those duties describe that tender, not every EPCM appointment. See the BPCL EPCM tender scope.
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4. Build and manage site interfaces
The contractor executes construction within its scope and controls its subcontractors, quality, and safety obligations as required by the contract. The owner commonly provides site access, coordinates with operating facilities, supports permits and interfaces, and maintains oversight. An EPCM or PMC consultant may supervise or monitor construction, coordinate work packages, and report progress; whether it can direct contractors depends on its authority under the agreement.
For a live refinery, the interface register and HSE and environmental plans should make clear how construction teams coordinate with plant operations, who authorizes work in controlled areas, and who resolves conflicts between packages. Do not treat consultant supervision as proof that the consultant has assumed the contractor’s execution responsibility.
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Commissioning and handover often cross organizational boundaries. The project documents should identify who prepares procedures, performs pre-commissioning and commissioning tests, supplies operations personnel, witnesses or approves test results, closes punch items, provides training and as-builts, and accepts the facility.
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BPCL’s tender describes the consultant’s scope as including “assistance in start-up, Pre-Commissioning, Commissioning & performance guarantee test run (PGTR) activities and project closure activities”. This is assistance in a particular EPCM contract, not a rule that all EPCM consultants perform those activities. The Eastern Refinery modernization procurement notice in Bangladesh offers a different example: its PMC scope includes monitoring EPC engineering against the contract and approved FEED, overseeing commissioning and start-up procedures, witnessing performance tests, and supporting acceptance, warranty or defect enforcement, as-builts, and handover. These are owner-side monitoring and coordination functions, not evidence that the PMC is the EPC designer or builder. See the Eastern Refinery PMC procurement notice.
6. Apply safety and environmental requirements
The owner sets project expectations and governance and monitors compliance; contractors implement the HSE and environmental controls required for their work. The IFC disclosure for the ERC Refinery says that environmental and social commitments arising from the ESIA were included in the EPC contract, while the refinery owner monitored alignment through contractor control plans. This project-specific example shows how requirements can flow into contractor obligations without removing owner oversight. See the IFC ERC Refinery disclosure.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to identify the real split on a named project
Use the project documents to trace both the task and the authority attached to it. A responsibility matrix can look deceptively simple if it names a party without saying whether it prepares, reviews, approves, executes, witnesses, or accepts the deliverable.
- EPC or EPCM agreement, including exhibits and amendments.
- Scope of work, exclusions, and package descriptions.
- Responsibility and approval matrix.
- Approved FEED and design basis.
- Battery-limit and tie-in registers and the interface register.
- Owner-furnished equipment list.
- Project execution plan.
- HSE and environmental plans.
- Inspection and test plans.
- Commissioning and performance-test procedures.
- Handover, training, punch-list, and as-built requirements.
Then map each significant deliverable or decision to the verbs used in those documents. “Prepare” and “execute” point to production or performance of the work; “review,” “approve,” and “witness” describe different oversight rights; “accept” identifies the party authorized to take delivery or make a contractual acceptance decision. The same package can have different parties assigned to each action.
Why there is no reliable percentage split
There is no established industry-wide percentage for how much refinery project work is performed by engineers, EPC contractors, or EPCM consultants. The cited project tenders and contract scopes assign tasks; they do not provide a comparable workload statistic. A percentage would also obscure differences in delivery model, project phase, brownfield conditions, and package strategy.
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