Design Considerations for Industrial Modular Buildings

An engineering team finalises the layout of a produced water treatment facility in a remote Abu Dhabi concession area and specifies four prefabricated technical buildings to house the electrical switchgear, control and instrumentation systems, chemical storage, and operator welfare functions. The buildings are ordered from separate suppliers, each working to their own structural grid, cladding system, and HVAC design convention. When the units arrive on site, the cable tray penetrations between the MCC room and the control room do not align. The HVAC units on two buildings share an exhaust orientation that forces recirculation under prevailing wind conditions. One building’s structural baseframe does not match the foundation bolt pattern cast by the civil contractor. Each of these problems is a design failure, and each one was entirely preventable. For EPC leads and project engineers specifying modular buildings for industrial infrastructure in the UAE and GCC, understanding what rigorous modular building design actually requires is the difference between a smooth site installation and a field rework programme measured in days and engineer-hours.

Why Modular Building Design Starts With Site Conditions, Not Dimensions

The most consequential design decisions for an industrial modular buildings project are made before a single structural member is sized or a floor plan is drawn. They are made when the design team systematically characterises the site environment, the operational function of each building, the installation method, the transport route, and the regulatory classification of the installation area. Fabricators who move directly to dimensional layout without completing this characterisation produce buildings that are structurally sound in isolation but compromised in their actual deployment context.

Site characterisation for GCC industrial prefabricated industrial buildings must address the following conditions as a minimum engineering input to the design process.

Ambient temperature range defines the thermal design load for the building envelope and the HVAC system. Inland desert sites in the UAE regularly record ambient temperatures exceeding 50°C during summer months, with ground surface temperatures and solar radiation adding heat gain to roof and south-facing wall panels that exceeds ambient air temperature by a significant margin. The design cannot use a single ambient figure; it must account for the diurnal temperature range, the peak sustained temperature during operational periods, and the effect of solar loading on exposed structural steel and cladding systems.

Wind load classification determines the structural design of the building frame and cladding attachment system. UAE sites are governed by structural loading requirements that must account for shamal wind events, which can generate sustained high-velocity wind conditions that impose lateral loads on large-panel modular structures beyond what typical commercial building loading assumes.

Soil bearing capacity and foundation type at the installation site directly governs the baseframe design. A modular buildings manufacturer in UAE who designs a baseframe assuming a concrete pad foundation will produce a unit that cannot be directly installed on a grillage or driven pile foundation without field modification. Foundation type must be confirmed from the civil engineering design before the structural baseframe is detailed.

Hazardous area classification, where applicable, defines the electrical equipment specification for the entire building, including lighting, HVAC motors, cable penetration fittings, and any instrument or communication equipment mounted within the building envelope. The area classification drawing must be issued to the building designer before any electrical or mechanical equipment selection is made.

Transport route constraints define the maximum building dimensions and weight that can be delivered to site. Road width, bridge load ratings, overhead obstruction heights, and permit requirements on UAE federal and emirate road networks set hard limits on modular building geometry that must be established before the dimensional design begins.

Structural Engineering Foundations for Industrial Modular Buildings

Industrial modular solutions are structural engineering problems before they are architectural or process engineering problems. The structural design of a modular industrial building must address three distinct loading conditions simultaneously: the static operational loads the building carries in its installed position, the dynamic loads imposed during road transport from the fabrication facility to site, and the lifting loads applied during crane installation. Buildings designed only for the operational static case, without transport and lifting analysis, frequently develop structural damage during delivery that is misattributed to site handling rather than recognised as a design deficiency.

Structural steel fabricators in UAE with genuine modular building engineering capability address all three loading conditions in the structural design documentation before fabrication begins. The structural frame is the primary load-carrying element, and its adequacy must be verified against each load case.

Steel Frame Selection and Load Classification

The primary structural frame for an industrial modular building is fabricated from structural steel sections, typically hot-rolled I-sections, hollow structural sections, or a combination, selected and sized to carry the imposed dead, live, wind, and seismic loads applicable to the installation site. UAE structural design is governed by loading standards that define the specific wind, live, and seismic parameters applicable to different geographic zones within the country. Frame design must reference the applicable standard explicitly, not generic load assumptions carried forward from earlier projects in different locations.

For modular technical buildings housing electrical switchgear, motor control centres, or relay and control panels, the structural floor system must be designed to carry concentrated point loads from heavy electrical equipment, not just uniform distributed loads. An MV switchgear assembly may impose a concentrated floor load exceeding 500 kilograms per linear metre at the switchgear base, concentrated along a narrow line load rather than distributed across the full floor area. Failure to account for this in the floor beam design produces visible deflection under switchgear weight, which can affect switchgear bus alignment and door operation over time.

Lifting lug design is a structural engineering task, not a fabrication detail. The lug size, plate thickness, weld specification, and position on the structural frame are determined by the total lift weight, the crane rigging geometry, the sling angle, and the dynamic amplification factor applied to the static lift weight for design purposes. Lifting lug calculations must be documented and available for client and inspection agency review before the lift is executed.

For transport, the structural design must consider the dynamic loading imposed by road surface irregularities, particularly on unpaved haul routes common on remote GCC construction sites. Transport analysis typically applies a vertical dynamic amplification factor to the static self-weight, combined with lateral and longitudinal acceleration loads from braking and cornering. Internally, all equipment mounted within the building must be verified for transport loads, as switchgear assemblies and panel boards not designed for transport dynamic loads can experience internal damage during delivery that is not externally visible.

Foundation Interface and Baseframe Design

The connection between the modular building and its permanent foundation is an interface that must be designed jointly by the structural engineer responsible for the building and the civil engineer responsible for the foundation. The baseframe of the modular building must match the anchor bolt pattern, the bearing surface level, and the grout pocket arrangement defined by the civil foundation design. When these are designed independently and coordinated only at the time of delivery, mismatches are common and field resolution is expensive.

The baseframe must also provide the primary means of weathering protection at the building perimeter. The gap between the baseframe and the foundation surface, after grouting, must be sealed against wind-driven sand, rain ingress, and, on coastal sites, salt-laden water that can accumulate against the base and accelerate corrosion of the structural frame and floor insulation system.

Environmental and Functional Design Requirements for GCC Sites

The building envelope of an industrial prefabricated industrial buildings installation on a GCC site performs a more demanding function than a standard commercial or light industrial enclosure. It must maintain stable internal conditions for sensitive electrical, instrumentation, and control equipment against an external environment characterised by extreme heat, solar radiation, wind-driven dust and sand, and, on coastal or offshore sites, high salinity and humidity.

The design of the building envelope, including the structural wall and roof panels, the insulation system, the cladding material, the penetration sealing system, and the door and window specifications, must be evaluated as a thermal and environmental system, not as a collection of individually selected components.

HVAC Design for Extreme Ambient Conditions

The HVAC system of an industrial modular technical buildings installation is an engineered system with a specific design brief: maintain the internal environment within the operating limits of the most sensitive installed equipment, under the worst-case external conditions expected at the installation site, for the full design service life of the building. This brief is more demanding than standard commercial HVAC design in several respects.

The internal heat gain load includes not only the external heat input through the building envelope but also the internal heat generated by the electrical and electronic equipment housed within the building. In a modular technical buildings application housing LV switchgear, motor control centres, and relay panels, the total installed electrical heat dissipation can add a substantial internal heat load that the HVAC system must remove continuously. This internal load must be calculated from the equipment heat dissipation data provided by the switchgear and panel OEMs, not estimated from generic assumptions.

Critical HVAC design requirements for GCC industrial modular buildings include:

• N+1 cooling unit redundancy, ensuring that a single HVAC unit failure does not cause internal temperature to rise above switchgear or instrument operating limits before the fault is detected and rectified
• Inlet air filtration rated for the specific particulate conditions of the installation site, with filter change intervals defined based on the actual dust loading expected at site, not on manufacturer default recommendations developed for temperate climates
• Positive internal pressure maintained relative to the external atmosphere, both to prevent unfiltered air ingress through building penetrations and, where the building is located within a Zone 2 hazardous area boundary, to comply with IEC 60079-13 pressurisation requirements
• Ductwork distribution designed to reach the lower sections of switchgear enclosures, where internal heat accumulation from busbar and connection losses is highest and natural convection alone is insufficient to maintain uniform temperature distribution

For containerized buildings adapted for industrial use, the HVAC design must account for the thermal mass and insulation limitations of the container wall construction, which is typically less thermally efficient than purpose-designed insulated panel systems. If a container-based solution is specified for a high-ambient GCC site, the HVAC capacity must be sized accordingly, and additional insulation lining may be required to achieve acceptable internal conditions without excessive HVAC running cost and maintenance demand.

Mechanical, Electrical, and Instrumentation Integration in Modular Buildings

The design of an industrial modular building reaches its full engineering complexity when the mechanical, electrical, and instrumentation (MEI) systems are integrated with the structural and HVAC design. This integration phase is where the majority of avoidable design conflicts originate, and it is where the difference between a multi-discipline engineering team and a structural fabricator with subcontracted MEI installation becomes most consequential.

The following comparison table sets out the primary MEI integration design dimensions for industrial modular buildings and the key considerations for each in the context of GCC industrial project requirements.

Electrical and Instrumentation Fit-Out Considerations

For modular technical buildings housing control and instrumentation functions, the instrument cable schedule and the I/O list for the DCS or PLC system are the primary design inputs that govern the cable containment sizing, the junction box count and positioning, and the marshalling panel layout. These documents are generated by the project instrument engineer, not by the building fabricator. They must be issued to the building designer before the internal layout is finalised, because the cable containment system cannot be correctly sized or routed without knowing the cable count, cable type, and instrument locations.

Fabrication companies in UAE offering industrial modular solutions with genuine in-house instrumentation engineering capability will incorporate the I/O list and cable schedule review into their standard design process. Those who treat the building as a structural shell and subcontract the instrumentation fit-out will face coordination issues at the interface between the structural design and the instrumentation installation that typically surface during fabrication rather than during design review.

For containerized buildings converted for use as instrument or telecommunications rooms, particular attention is required at the cable entry points, where the container wall thickness and the curvature of the corrugated steel wall profile make watertight, dust-proof penetration sealing more difficult to achieve than on flat-panel modular buildings with purpose-designed penetration frames.

What to Evaluate When Selecting a Modular Buildings Manufacturer in UAE

Procurement engineers qualifying modular buildings manufacturer in UAE options for industrial infrastructure projects should evaluate suppliers against a defined set of engineering and quality criteria rather than on price and delivery schedule alone. The structural, environmental, and MEI integration requirements described in the preceding sections define the minimum engineering competence that a capable manufacturer must demonstrate. Assessing that competence during vendor qualification, rather than discovering its absence during fabrication or after site delivery, is the most effective risk management action available to the project team.

The following evaluation criteria apply specifically to fabrication companies in UAE supplying industrial modular buildings for oil and gas, power generation, water treatment, or infrastructure projects:

• Multi-discipline in-house engineering capability. Confirm that structural, HVAC, electrical, and instrumentation engineering are performed by the manufacturer’s own engineering team, not subcontracted to separate parties. The coordination between disciplines must happen within a single engineering team, not at the interface between separate contractors.
• 3D modelling and clash detection. The manufacturer should produce a 3D model of the building that integrates the structural frame, HVAC ducting, cable trays, panels, and equipment, and should issue clash detection reports to the client during detailed design. This is the primary tool for identifying and resolving conflicts before fabrication begins.
• Documented ITP with defined hold and witness points. The Inspection and Test Plan must define which fabrication and testing activities require client notification for witness or review. For projects with ADNOC oversight or independent lender engineer requirements, confirm that the ITP format and hold point structure are acceptable to the inspection authority before contract award.
• Transport and lifting engineering scope. Confirm that transport analysis and lifting lug design documentation are included in the engineering deliverables, and that the manufacturer has experience in coordinating special transport permits for oversized loads on UAE road networks.
• References at comparable specification. Request references for completed prefabricated industrial buildings at equivalent scale, environmental rating, voltage class, and hazardous area classification. A manufacturer with experience in standard LV MCC rooms may not have the design experience required for an MV E-House in a Zone 2 hazardous area.
• ISO 9001 certification covering design. The ISO 9001 scope statement must explicitly cover design activities. Certification covering fabrication and testing only does not provide assurance over the design engineering quality that is the primary determinant of whether the building performs correctly in service.

Berg Engineering’s Industrial Modular Building Design and Fabrication Capabilities

Berg Engineering fabricates modular buildings and modular technical buildings for oil and gas, power generation, water treatment, and infrastructure clients from facilities in Ras Al Khaimah and Sharjah. As established structural steel fabricators in UAE, Berg’s engineering team manages structural design, HVAC engineering, electrical installation, and instrumentation integration within a single in-house multi-discipline team, eliminating the subcontractor interface gaps that generate the most common modular building design conflicts.

Berg’s modular building scope covers prefabricated industrial buildings for electrical and power distribution functions, including E-Houses housing MV and LV switchgear, motor control centres, and protection relay panels. The scope extends to prefabricated control room buildings with DCS operator workstations, instrument equipment rooms, telecommunications buildings, analyser shelters, and combined MCC and instrument rooms. For projects requiring containerized buildings in standard ISO container frames, Berg fabricates the internal fit-out to the same engineering standard as purpose-built panel buildings, with penetration sealing and HVAC systems designed specifically for the container envelope.

As a certified modular buildings manufacturer in UAE, Berg operates within an ISO 9001 certified quality management system that covers design, fabrication, and testing. The ITP for each building project is developed against the specific project inspection requirements and submitted for client and inspection agency approval before fabrication begins. Factory Acceptance Testing is conducted at the Ras Al Khaimah facility using dedicated test equipment, with provision for client and third-party inspection agency witness at defined hold points.

Berg’s ASME and UL certifications support the integration of pressure equipment and UL-listed electrical systems within modular building packages where project specifications require it. For industrial modular solutions combining process skid packages with modular technical buildings on the same project, Berg coordinates the complete scope under a unified engineering team, ensuring that instrument cable schedules, electrical load lists, structural interfaces, and HVAC heat loads are aligned across both the buildings and the process skids from the start of detailed design.

For procurement teams evaluating modular building options for upcoming GCC projects, Berg’s fabrication capabilities in relation to E-House design and environmental performance are described in further detail at prefabricated E-House solutions and modular fabrication UAE.

Frequently Asked Questions