Built in the Workshop, Ready for the Site: The Advantages of Modular Process Plants

Truckable, prefabricated process plants can reduce field construction, improve quality and accelerate the implementation of industrial projects – particularly at remote or infrastructure-constrained locations.

Instead of constructing an entire process facility component by component at its final location, modular plants are divided into transportable units. Process equipment, piping, valves, instrumentation, electrical systems and controls are assembled on structural steel frames under controlled workshop conditions.

The completed modules are tested, preserved and transported to the project site, where they are positioned on prepared foundations and connected to utilities, storage systems and other plant sections through clearly defined interfaces.

What Is a Modular Process Plant?

A modular process plant is not simply conventional equipment placed inside a container.

It is a complete process system divided into engineered modules with defined mechanical, electrical, control and utility interfaces. Depending on the application, a single module may contain pumps, vessels, heat exchangers, columns, reactors, filtration systems, compressors, instrumentation, cabling and local control equipment.

Smaller systems can be installed on one transportable skid. Larger plants may consist of multiple modules that are shipped separately and connected at the project site.

The modular approach can be applied to:

• Individual process packages
• Complete production lines
• Pilot and demonstration plants
• Small commercial plants
• Phased industrial developments
• Additions to existing facilities
• Temporary or relocatable production capacity

The objective is to transfer as much work as reasonably possible from the construction site into a controlled fabrication environment.

Why Build in a Workshop?

Industrial construction sites are rarely ideal production environments.

Weather, restricted access, shortage of skilled labour, work permits, simultaneous construction activities and limited availability of cranes can reduce productivity and create schedule uncertainty. These problems become more severe at remote sites where accommodation, transport and site infrastructure must first be established for the construction workforce.

A specialised fabrication workshop offers more predictable conditions:

• Skilled labour is already available
• Tools and lifting equipment are permanently installed
• Materials can be stored and controlled properly
• Welding and fabrication take place under protected conditions
• Mechanical, electrical and instrumentation work can proceed in parallel
• Quality inspections are easier to coordinate
• Factory acceptance testing can be completed before shipment
• Rework can be identified before the modules reach the site

This can reduce the number of labour hours required at the final location and improve both schedule certainty and construction quality.

The cost advantage is particularly relevant where field labour, accommodation, transport, security and temporary infrastructure are expensive.

Designed to Be Truckable

The term “truckable” means that a module is designed around the limitations of practical road transportation.

Module dimensions and weight must reflect the available transport route, vehicle capacity, axle loads, bridge clearances, turning radii, port access and local regulations. These constraints must be considered during the initial engineering phase.

Trying to convert an already completed conventional plant design into transportable modules at a later stage usually leads to compromises, additional steelwork and unnecessary cost.

A properly designed truckable module includes:

• Structural lifting and transportation points
• Temporary transport bracing
• Clearly defined battery-limit connections
• Accessible mechanical and electrical interfaces
• Protection for instruments and sensitive equipment
• Suitable preservation for transport and storage
• A lifting, loading and transportation concept
• Identification and documentation for installation

Modules may be transported by road, rail, inland waterway or sea. The selected transport method determines the practical module size and level of workshop completion.

Faster Installation at Remote Sites

Once delivered, the modules are lifted onto prepared foundations and connected through pre-engineered interfaces.

This does not make the plant completely “plug-and-play” in the sense of consumer equipment. Civil works, storage facilities, utilities, fire protection, power supply, control integration and offsite systems still have to be provided.

However, the amount of fabrication and assembly performed at the site can be reduced considerably.

While the modules are being manufactured in the workshop, the owner can develop the site in parallel. Foundations, roads, buildings, storage tanks and utility systems can be constructed while the process equipment is assembled elsewhere.

This parallel execution can shorten the overall project schedule compared with a fully sequential construction approach.

Scalable and Expandable by Design

One of the strongest advantages of modular process plants is the ability to develop capacity in phases.

Instead of investing immediately in one large production facility, an owner can begin with the capacity required for the initial market. Additional modules can then be installed as feedstock availability, product demand or financing increases.

For example, a project may begin with:

• One production train
• Basic feed preparation
• Initial storage capacity
• Essential utility systems
• A simplified product range

Further processing, treatment or production modules can be added later.

This approach can reduce initial capital exposure and allow actual operating experience to influence subsequent expansion decisions.

Standardised modules also make it possible to replicate the same production concept at different locations. The engineering developed for the first plant can be adapted for additional sites, subject to local codes, feedstock properties and environmental conditions.

Relocatable Industrial Capacity

A modular plant can also be designed for later relocation.

This may be valuable for:

• Temporary production requirements
• Remote resource developments
• Pilot and demonstration projects
• Mining operations with limited project life
• Changing feedstock locations
• Early production facilities
• Lease-based production models
• Markets with uncertain long-term demand

Relocation is practical only when it has been considered in the original design. Foundations, interfaces, piping connections, transport frames and lifting arrangements must allow controlled disconnection and reassembly.

A plant that was merely assembled on skids is not automatically economical to relocate.

Applications Across Multiple Industries

Modular process technology is not limited to mini-refineries.

Potential applications include:

Oil, Gas and Refining

• Crude-oil distillation
• Condensate processing
• Diesel and gasoline production
• Naphtha fractionation
• Gas sweetening and dehydration
• Natural-gas liquids recovery
• Fuel treatment and desulphurisation
• Produced-water treatment

Chemicals and Petrochemicals

• Distillation and separation
• Solvent recovery
• Chemical blending
• Polymer processing
• Reaction and purification systems
• Specialty chemical production

Energy and Emerging Technologies

• Hydrogen production
• Biogas and biomethane treatment
• Carbon-capture systems
• Waste-to-fuel processes
• Synthetic fuels
• Battery-material processing
• Industrial heat-recovery systems

Water and Environmental Services

• Industrial wastewater treatment
• Desalination
• Filtration and membrane systems
• Oil-water separation
• Effluent treatment
• Waste-processing systems

Mining and Remote Industries

• Ore and mineral processing
• Reagent preparation
• Water treatment
• Fuel production
• Utility systems
• Temporary processing facilities

The concept is especially attractive where the process can be divided into repeatable production trains or clearly defined functional packages.

Modular Does Not Automatically Mean Cheaper

Modularisation is not the best solution for every project.

Additional structural steel, transportation frames, lifting requirements and module logistics can increase cost. Oversized modules may require route modifications, special permits or expensive heavy-lift transport.

A conventional site-built plant may be more economical where:

• Skilled local labour is readily available
• The site has good infrastructure
• Transportation routes are severely restricted
• The process equipment is too large to modularise efficiently
• The plant has extensive underground systems
• The design is unlikely to be repeated
• Site construction costs are comparatively low

The correct decision must be based on the total installed cost and project schedule, not only on the workshop fabrication price.

The comparison should include:

• Engineering and procurement
• Workshop fabrication
• Module steel and transportation frames
• Factory testing
• Packing and preservation
• Road and sea transport
• Heavy lifting
• Site preparation
• Interconnection work
• Commissioning
• Schedule-related financing costs
• Construction and interface risks

In many remote or fast-track projects, the reduction in field work and schedule risk can outweigh the additional cost of modular structures and transportation.

The PRIOS Approach

PRIOS supports project owners, developers and investors in evaluating whether modular process plants are technically and commercially suitable for their projects.

Our work begins with the process requirement and the conditions at the intended project site.

We assess:

• Feedstock and required products
• Plant capacity and operating profile
• Available utilities
• Site and infrastructure conditions
• Transportation routes
• Local construction capability
• Expansion requirements
• Required implementation schedule
• Applicable codes and standards
• Potential for later relocation
• Total installed cost

Based on this assessment, PRIOS can support the project through:

• Project identification and feasibility studies
• Technology and supplier selection
• Definition of modularisation philosophy
• Preparation of equipment and process requirements
• Technical and commercial bid evaluation
• Factory inspection and progress monitoring
• Transportation and installation planning
• Site integration and commissioning support

The objective is not to make every plant modular. It is to identify the execution concept that provides the strongest combination of cost, schedule, quality and operational flexibility.

From Workshop to Operation

Modular process plants can provide a practical route to industrial development in locations where conventional construction would be slow, expensive or difficult to manage.

Their value lies not only in transportability. The greater advantage comes from transferring fabrication, assembly and testing into an environment where labour, equipment and quality-control systems are already available.

When the process, transport route and site interfaces are considered from the beginning, modularisation can:

• Accelerate project implementation
• Reduce remote-site construction
• Improve quality and testing
• Support phased investment
• Enable later expansion
• Provide relocatable production capacity
• Create repeatable plant concepts

The result is not merely a smaller plant. It is a different project-execution strategy – one that connects workshop efficiency with faster and more predictable installation at the final site.