Re-Engineering a 20 TPH LLDPE Powder Pneumatic Conveying System
for a Petrochemical Plant Through Brownfield Basic Engineering Consultancy
Brownfield expansion projects in petrochemical plants are rarely constrained by equipment availability—they are constrained by how effectively existing assets can be repurposed.
A leading petrochemical manufacturer approached us with a challenging objective:
The setup consists of an existing nitrogen-based pneumatic conveying system designed for 15 MT/hr of LLDPE powder over 60 meters. Can the existing infrastructure be re-engineered to reliably convey 20 MT/hr of LLDPE powder over nearly 300 meters while maximizing the utilization of existing equipment and pipelines?
Read MoreThe Engineering Challenge
The client planned to relocate LLDPE powder from the existing production area to a newly proposed storage and bagging facility near the old warehouse.
The project objectives included:
Achieving approximately 20 MT/hr conveying capacity
eusing the existing nitrogen conveying infrastructure
Minimizing capital investment
Maintaining inert conveying conditions
Avoiding degradation of LLDPE powder quality
Integrating seamlessly with existing utilities
Developing an engineering package suitable for EPC implementation
Nitrogen Blower
Gas Cooler
Process Filter
Existing SS304 Conveying Line (~70 m)
Existing SS304 Nitrogen Return Line (~60 m)
Nitrogen blower capability
Cooling capacity
Filter performance
Existing piping
Electrical infrastructure
Available MCC feeders
Hazardous area compliance
Maximum reuse philosophy
Partial replacement philosophy
New equipment alternatives
Rather than replacing the complete conveying system, the challenge was to determine:
How much of the existing infrastructure could realistically be reused without compromising system performance?
Existing Infrastructure Available
One of the project's biggest advantages - and engineering constraints - was the availability of existing conveying infrastructure.
The existing plant already had:
The proposed expansion required approximately 230 m of additional pipeline, resulting in an overall conveying route approaching 300 meters.
The engineering challenge was therefore not simply pipeline extension - it involved understanding whether the available blower pressure, gas flow, line velocities, and pressure losses would remain within acceptable operating limits after the system extension.
Engineering Philosophy
Rather than beginning with equipment selection, Indpro adopted a system-first engineering methodology.
The consultancy focused on answering three fundamental engineering questions:
1. Is the target capacity physically achievable?
Before selecting any equipment, detailed hydraulic calculations established the theoretical and practical conveying limits, after thorough testing of the powder in Indpro’s Pilot Plant Facility and establishing the right pneumatic conveying parameters for the product.
2. Can the existing infrastructure be reused?
Every existing asset was evaluated before proposing new equipment.
This included:
3. What is the lowest CAPEX solution without sacrificing reliability?
Multiple engineering options were evaluated, including:
The final engineering package enabled informed commercial decision-making before project execution.
Indpro developed a complete Basic Engineering Package covering every engineering discipline required for EPC implementation.
| Engineering Deliverable | Scope of Work |
|---|---|
| Process Calculations & Hydraulic Analysis | Performed pneumatic conveying calculations to establish the feasible conveying capacity, pressure drop, nitrogen flow requirements, and hydraulic characteristics of the conveying system. |
| Process Flow Diagram (PFD) with Heat & Mass Balance | Developed the Process Flow Diagram incorporating process flow, heat and mass balance, utility requirements, and equipment interfaces. |
| Piping & Instrumentation Diagram (P&ID) | Prepared complete P&IDs showing process equipment, instrumentation, control valves, interlocks, isolation valves, and process control philosophy for the updated configuration. |
| Basic Equipment Layout | Developed preliminary equipment arrangement for process equipment and pipeline interfaces to ensure maintainability, accessibility, and efficient plant integration. |
| Plant Layout & Plot Plan Engineering | Prepared equipment layout considering overall plot plan, pipeline routing, maintenance access, and integration with the palletizing facility. |
| Equipment Datasheets & Specifications | Prepared technical datasheets and specifications for the new equipment needed. |
| Piping Engineering & Specifications | Defined specifications for conveying and nitrogen return pipelines, including materials of construction and extension philosophy. |
| Civil & Structural Engineering Inputs | Developed civil load data for foundation design and structural engineering of the new equipment. |
| Instrumentation Engineering | Prepared instrument datasheets, technical specifications, instrument selection, and process measurement philosophy for new instruments that replaced the outdated ones. |
| Control Philosophy | Developed operating philosophy including start-up, shutdown, interlocks, alarms, trips, and process sequencing for the new configuration. |
| Hazardous Area Classification | Prepared Area Classification Drawings for the new installation and reviewed hazardous area compliance. |
| Electrical Engineering | Prepared electrical equipment specifications, motor selection criteria, and electrical datasheets. |
| Single Line Diagram (SLD) | Developed the electrical power distribution philosophy including MCC configuration, incomers, bus coupler, and power distribution scheme. |
| Electrical Equipment Selection | Defined the selection criteria for motors and electrical equipment suitable for hazardous locations. |
| General Arrangement (GA) Drawings | Prepared tentative General Arrangement drawings for the new equipment needed. |
| L2 Project Schedule | Developed the Level-2 engineering schedule defining engineering milestones and project timelines. |
| Site Survey & Engineering Study | Conducted detailed site visits to assess the existing system, collect engineering data, verify dimensions, and identify tie-in points. |
| CAPEX Cost Estimation | Prepared budgetary cost estimates for two implementation scenarios: (i) Maximum utilization of existing infrastructure and (ii) Installation of new equipment. |
| Standard | Description | Application in the Project |
|---|---|---|
| IS 875 (Part 3) | Code of Practice for Design Loads (Other than Earthquake) – Wind Loads | Used for structural and foundation design of the new equipment and supporting structures. |
| IS 9178 (Part 1) | Criteria for Design of Steel Bins for Storage of Bulk Materials | Used for the design philosophy, load assessment, and engineering of the new storage silo. |
Why This Project Matters
Many engineering consultancies produce calculations.
Few demonstrate that those calculations remain valid years after commissioning.
This project illustrates the importance of rigorous front-end engineering:
- Existing assets were successfully repurposed.
- Nitrogen conveying infrastructure was retained wherever practical.
- Brownfield integration minimized capital expenditure.
- The engineering package enabled efficient EPC execution.
- The installed system has operated successfully for over 2 years, validating the original engineering methodology.
Key Engineering Takeaways
This project highlights several broader lessons for engineers involved in brownfield bulk solids handling:
Conclusion
This project demonstrates how comprehensive Basic Engineering Consultancy can unlock significant value in brownfield petrochemical facilities. By rigorously evaluating the capability of existing nitrogen generation infrastructure, Indpro developed a technically robust solution that balanced process performance, safety, and capital efficiency.
Rather than relying on conservative assumptions that often lead to major equipment replacement, the engineering approach emphasized data-driven process analysis, multidisciplinary integration, and maximum utilization of available assets. The resulting engineering package provided the EPC contractor with a clear execution roadmap while enabling the client to make informed investment decisions.
More importantly, the successful operation of the system for over 2 years confirms that high-quality engineering is measured not only by the accuracy of calculations and drawings, but by sustained plant performance under real operating conditions.
Cost Impact: By repurposing existing assets instead of replacing the entire system, the customer completed the project at approximately one-fourth of the budgeted cost.
It reinforces a key principle for brownfield modernization projects:
With the right engineering methodology, existing infrastructure can often deliver far greater value than initially anticipated. This sets the groundwork for the overall CAPEX needed for such a brownfield project, which can sometimes result in savings of over 70%!
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