What Equipment Is Used in HVO and Renewable Diesel Plants?

HVO and renewable diesel plants require a complete equipment train that can handle variable renewable feedstocks, protect hydrotreating catalysts, manage hydrogen service, separate products, and support safe long-term operation. For EPC contractors, refinery conversion teams, biofuel project owners, and equipment buyers, selecting HVO plant equipment is not only about purchasing a reactor. The full system must connect feedstock receiving, pretreatment, high-pressure conversion, hydrogen handling, separation, fractionation, storage, utilities, safety, and environmental equipment.

Renewable diesel is commonly produced by hydrotreating oils, fats, and greases into hydrocarbon fuel. The U.S. Department of Energy’s Alternative Fuels Data Center describes renewable diesel as a biomass-derived diesel fuel that can be used in petroleum diesel engines. For industrial projects, this means renewable diesel production often shares equipment requirements with refinery hydroprocessing, while also adding special feedstock pretreatment and contaminant-control needs.

What Equipment Is Used in HVO and Renewable Diesel Plants?

HVO and renewable diesel plants typically use equipment across several process areas:

• Feedstock receiving, heating, sampling, storage, and transfer systems
• Feedstock pretreatment equipment for degumming, filtration, drying, bleaching, and contaminant removal
• Hydrotreating and hydrodeoxygenation reactors
• Hydroisomerization reactors for cold-flow property improvement
• Hydrogen compression, recycle gas, purification, and safety systems
• Heat exchangers, fired heaters, coolers, and condensers
• High-pressure and low-pressure separators
• Fractionation columns, stabilizers, reboilers, reflux drums, and product coolers
• Renewable diesel, naphtha, propane, intermediate, and feedstock storage tanks
• Wastewater treatment, sour water handling, flare, utilities, DCS, SIS, and environmental systems

The exact equipment scope depends on feedstock quality, plant capacity, product targets, hydrogen source, process licensor, refinery integration, environmental permit, and project delivery strategy.

Feedstock Receiving and Storage Equipment

HVO feedstocks are not uniform petroleum streams. A plant may receive refined vegetable oil, used cooking oil, yellow grease, brown grease, animal fat, tallow, poultry fat, distillers corn oil, palm residues, or other lipid-based materials. These feedstocks can vary in moisture, solids, free fatty acids, phosphorus, chlorides, metals, soaps, gums, oxidation products, and melting point.

Common feedstock receiving and storage equipment includes:

• Truck unloading stations, railcar unloading racks, or marine unloading systems
• Weighing, sampling, metering, and quality-control equipment
• Coarse strainers, filters, and transfer pumps
• Heated and insulated transfer piping
• Bulk storage tanks, day tanks, blend tanks, and pretreatment feed tanks
• Tank mixers, recirculation loops, and water draw-off systems
• Nitrogen blanketing, vents, level instruments, and temperature instruments
• Containment dikes, drainage systems, and spill-control equipment

For project teams planning tankage and process vessels, industrial storage tanks and custom pressure vessels may be reviewed as part of the front-end equipment package.

Feedstock Pretreatment Equipment

Pretreatment is one of the most important equipment areas in a renewable diesel plant. Renewable feedstocks can contain catalyst poisons and corrosion-related contaminants, so the feed must be cleaned before entering high-pressure hydroprocessing. Alfa Laval describes HVO pretreatment systems for removing impurities before biofuel production, while Desmet also presents HVO and SAF pretreatment solutions for renewable feedstocks.

Pretreatment equipment may include:

• Degumming systems
• Acid dosing and mixing equipment
• Water washing systems
• Centrifuges and separation equipment
• Bleaching vessels and adsorbent dosing systems
• Filter presses, pressure leaf filters, and polishing filters
• Vacuum dryers and moisture removal systems
• Guard beds, chloride removal beds, and adsorbent beds
• Heat exchangers, heaters, pumps, and process vessels

Pretreatment protects downstream catalysts, improves operating stability, and supports feedstock flexibility. A plant designed only for clean refined oil may not be able to process used cooking oil or animal fat without stronger pretreatment equipment.

For lower-quality feedstocks, pretreatment design should be based on the final hydrotreater feed specification rather than only on percentage removal. A practical pretreatment unit may need to control final phosphorus, metals, chlorides, moisture, polyethylene, gums, soaps, solids, and oxidation products. Buyers should define both the normal feedstock slate and the worst credible feedstock case, because a system that works for refined vegetable oil may not be commercially reliable for used cooking oil, yellow grease, tallow, or brown grease.

Common pretreatment design mistakes include undersizing filtration for dirty feedstocks, ignoring spent adsorbent handling, overlooking wastewater load from degumming and washing, and failing to provide enough recirculation or reprocessing routes for off-spec oil. Heat tracing and insulation also matter because tallow, animal fat, and high-melting grease can plug suction lines, strainers, filters, and unloading systems if the front end is designed like a clean liquid tank farm.

Hydrotreating Reactors and High-Pressure Conversion Equipment

The core conversion section of an HVO plant is the hydrotreating or hydrodeoxygenation unit. In this section, renewable feedstocks react with hydrogen over catalysts at elevated pressure and temperature. Oxygen is removed and the feed is converted into paraffinic hydrocarbons suitable for renewable diesel production.

Typical high-pressure conversion equipment includes:

• High-pressure feed pumps
• Make-up hydrogen compressors and recycle gas compressors
• Feed-effluent heat exchangers
• Charge heaters or fired heaters
• Guard reactors or guard beds
• Hydrotreating reactors and hydrodeoxygenation reactors
• Hydroisomerization reactors
• Catalyst beds, distributors, quench systems, and reactor internals
• Hot separators, cold separators, gas scrubbers, and sour water vessels

For reactor-heavy projects, buyers can review custom pressure vessels and broader pressure vessels for oil and gas when planning hydroprocessing-style equipment packages.

The hydrotreating reactor is not an empty shell. It may include inlet distributors, vapor-liquid distribution trays, catalyst support grids, inert balls, catalyst beds, quench zones, redistributors, thermowells, outlet collectors, internal screens, and guard layers. Poor distribution can create zones with too much liquid, too little hydrogen, or excessive temperature, accelerating catalyst deactivation and reducing product quality.

Many HVO projects use a second-stage hydroisomerization or selective hydrocracking reactor. This stage improves cloud point and winter performance by branching normal paraffins. The equipment configuration may be a single reactor with multiple catalyst beds, two reactors in series, or another licensor-specific arrangement. The key is selectivity: insufficient isomerization creates poor cold-flow properties, while excessive severity can overcrack diesel-range molecules into naphtha and light gas.

Hydrogen Processing Equipment

Hydrogen is central to most commercial HVO and renewable diesel routes. It is used to remove oxygen from oils and fats, saturate molecules, and support hydroisomerization. Valero describes its renewable diesel process as a route where waste feedstocks are pretreated and then hydrotreated with hydrogen before further upgrading and fractionation.

Hydrogen-related equipment may include:

• Hydrogen supply pipelines or hydrogen plant interfaces
• Make-up hydrogen compressors
• Recycle gas compressors
• Pressure swing adsorption or purification systems
• Gas-liquid separators and knock-out drums
• Gas scrubbers and amine treating equipment, where required
• Analyzers, flow meters, pressure control, and safety valves
• Hydrogen leak detection, ventilation, and emergency shutdown systems

Hydrogen service affects material selection, pressure vessel design, leak prevention, hazardous-area classification, pressure relief, and emergency response. Hydrogen systems should be engineered as core process assets rather than optional utilities.

Hydrogen quality also matters. The recycle loop must maintain enough hydrogen partial pressure while controlling light gases, carbon oxides, hydrogen sulfide, ammonia, water vapor, and other contaminants. Gas treatment and purge control help protect catalyst activity and avoid unstable operation. If the project is integrated with an existing refinery, the hydrogen source may come from a central hydrogen network. A standalone renewable diesel plant may need a dedicated hydrogen plant, pipeline supply, or purchased hydrogen strategy.

Hydrogen safety equipment may include hydrogen detectors, LEL detectors, emergency isolation valves, purge systems, ventilation, hazardous-area electrical equipment, pressure relief devices, emergency shutdown functions, and fire-and-gas integration. Detector placement should consider hydrogen buoyancy, roof structures, compressor shelters, analyzer houses, high points, and ventilation patterns.

Heat Exchangers, Separators, and Fractionation Equipment

HVO and renewable diesel plants use heat transfer equipment throughout the process. Heat exchangers may recover heat between reactor feed and effluent, cool separator streams, condense overhead vapors, support product cooling, and improve energy efficiency.

Common heat transfer and separation equipment includes:

• Feed-effluent heat exchangers
• Shell and tube heat exchangers
• Air coolers and water coolers
• Condensers and reboilers
• High-pressure separators
• Low-pressure separators
• Sour water drums and hydrocarbon receivers
• Stabilizers and distillation or fractionation columns
• Reflux drums, product coolers, pumps, and product rundown systems

Depending on the product slate, fractionation may separate renewable diesel, renewable naphtha, renewable propane, light gases, water, and sustainable aviation fuel range material. Axens describes renewable diesel and jet fuel technology options that can be tuned depending on market and process targets.

For equipment planning, industrial heat exchangers, shell and tube heat exchangers, and process towers and columns may be part of the same EPC procurement scope.

Product Storage and Loading Equipment

After conversion and fractionation, finished and intermediate streams must be stored, blended, sampled, and loaded. Product storage equipment may include:

• Renewable diesel tanks
• Renewable naphtha tanks
• Propane or LPG handling systems
• Intermediate product tanks
• Additive injection systems
• Blending tanks and custody-transfer metering
• Truck, rail, or marine loading systems
• Sampling systems and quality-control interfaces

Storage design should consider product segregation, contamination prevention, temperature control, emissions control, fire protection, traceability, and customer quality requirements.

Utilities, Safety, Automation, and Environmental Equipment

Balance-of-plant systems make the main process equipment usable. HVO plants may require steam, hot oil, cooling water, nitrogen, instrument air, fuel gas, electrical distribution, emergency power, firewater, flare, process control, and environmental systems.

Important supporting equipment may include:

• Boilers, hot oil heaters, cooling towers, and water treatment systems
• Nitrogen generators, air compressors, and instrument air dryers
• Firewater pumps, foam systems, gas detectors, flame detectors, and deluge systems
• Pressure relief valves, flare headers, flare knock-out drums, and flare stacks
• DCS, SIS, PLC panels, analyzers, historians, and cybersecurity systems
• Wastewater equalization, DAF, neutralization, biological treatment, and sludge handling
• Vapor recovery, carbon adsorption, thermal oxidation, LDAR, and emissions monitoring

For project owners, wastewater and odor control should be reviewed early because feedstock pretreatment can generate fats, oils, grease, high-COD wastewater, spent bleaching earth, filter cake, and other residual streams. These environmental systems should be planned together with pretreatment, storage, and utility equipment rather than added as an afterthought.

Pressure Relief, Flare, and Emergency Depressuring

The flare and relief system is one of the most important safety systems in an HVO plant. It may receive relief or depressuring flows from reactors, separators, compressors, hydrogen systems, stabilizers, fractionators, LPG systems, and tank vents where routed. Equipment can include pressure relief valves, rupture disks, emergency depressuring valves, flare headers, flare knock-out drums, liquid seals, purge systems, flare pilots, ignition systems, and flare monitoring instruments.

Emergency depressuring is commonly considered for high-pressure hydrogen sections, but the depressuring rate must be coordinated with flare capacity, low-temperature effects, material limits, noise, vibration, and catalyst protection. The depressuring valves, restriction orifices, flare header, flare knock-out drum, and flare stack should be reviewed as one system.

Automation, Controls, and Analyzers

Automation connects the equipment train into a stable operating plant. A DCS may manage feed rates, tank routing, reactor temperatures, hydrogen flows, separator levels, column pressure, reflux, reboiler duty, product routing, wastewater flow, and utility headers. A SIS may handle high-high reactor temperature trips, low hydrogen flow trips, compressor shutdown, emergency feed isolation, heater fuel shutoff, high separator level trips, and emergency depressuring functions.

Package PLCs are often used for compressors, boilers, nitrogen generators, cooling towers, wastewater units, firewater pumps, loading systems, and metering skids. Buyers should define communication signals, hardwired trips, permissives, restart logic, alarm philosophy, historian tags, analyzer interfaces, cybersecurity zoning, and backup procedures before equipment orders are finalized.

Environmental and Waste Handling Equipment

Environmental equipment may include wastewater equalization tanks, pH neutralization, emulsion-breaking chemicals, dissolved air flotation, oil-water separation, anaerobic or aerobic biological treatment, clarifiers, membrane systems, sludge dewatering, odor control, vapor recovery, condensers, thermal oxidizers, activated carbon beds, stormwater systems, and emissions monitoring.

Spent bleaching earth, silica, filter cake, tank sludge, and centrifuge solids should also be planned as part of the equipment package. These materials can contain residual oil, metals, phosphorus, soaps, chlorides, and organic matter. Handling equipment may include filter discharge systems, cake hoppers, screw conveyors, sealed bins, nitrogen blanketing, cake coolers, oil recovery presses, odor control, temperature monitoring, and fire detection.

Common Design and Procurement Mistakes

Designing Around Average Feedstock Quality

The first mistake is designing pretreatment around average feed quality instead of the full feedstock envelope. Feedstock flexibility only works when receiving, storage, heating, filtration, adsorption, drying, and reprocessing equipment can handle the real contaminant range.

Treating Hydrogen Safety Like Ordinary Fuel Gas

Hydrogen service needs specific attention to leakage, ventilation, detection, isolation, purging, ignition control, pressure relief, and emergency shutdown. It should not be treated as a normal fuel-gas utility.

Undersizing Relief, Flare, and Wastewater Systems

Relief and flare systems affect the whole plot plan, while wastewater equipment may be more demanding than expected because renewable diesel pretreatment can generate high-COD, oily, and solids-containing wastewater. Both areas should be reviewed during early engineering.

Comparing Suppliers Only by Equipment Price

A low quotation may exclude internals, NDT, heat treatment, coating, third-party inspection, export packing, documentation, or delivery support. EPC buyers should compare the same technical and delivery scope.

Manufacturing and Procurement Considerations

Many HVO plant equipment items are customized pressure equipment. Before ordering, the manufacturer should review drawings, process datasheets, materials, welding requirements, internals interfaces, NDT scope, pressure testing, coating, documentation, packing, and delivery conditions.

A large-scale pressure vessel manufacturer can support fabrication and technical coordination for reactors, separators, heat exchangers, columns, storage vessels, and custom process equipment. Buyers should compare suppliers on the same technical scope, not only on equipment price.

What Buyers Should Prepare Before Requesting a Quotation

Before requesting a quotation for HVO or renewable diesel plant equipment, buyers should prepare:

• Plant capacity and product target
• Feedstock slate and impurity limits
• Process flow diagram or equipment list
• Process datasheets and general arrangement drawings
• Design pressure and design temperature
• Operating pressure and operating temperature
• Hydrogen source and hydrogen quality
• Material specifications and corrosion allowance
• Reactor internals, catalyst, and nozzle interface requirements
• NDT, inspection, and pressure testing requirements
• Coating, insulation, or lining requirements
• Utility conditions and environmental treatment requirements
• Delivery destination, transport limits, and documentation requirements

FAQ

What equipment is used in HVO and renewable diesel plants?

Common equipment includes feedstock tanks, unloading systems, pretreatment units, filters, dryers, hydrotreating reactors, hydrogen compressors, heat exchangers, separators, fractionation columns, wastewater treatment systems, utilities, safety systems, and product storage tanks.

Why is feedstock pretreatment equipment important?

Pretreatment removes or reduces solids, phosphorus, metals, chlorides, moisture, gums, and other contaminants that can poison catalysts, increase pressure drop, corrode equipment, or reduce product quality.

Is hydrogen equipment required for renewable diesel production?

Most commercial HVO and renewable diesel processes require hydrogen because hydrotreating removes oxygen from oils and fats and converts them into paraffinic hydrocarbons.

What reactor equipment is used in HVO plants?

HVO plants may use guard reactors, hydrotreating reactors, hydrodeoxygenation reactors, hydroisomerization reactors, catalyst beds, quench systems, reactor internals, and associated high-pressure separators.

Why do renewable diesel plants need fractionation and storage equipment?

Hydroprocessed product contains multiple streams such as renewable diesel, naphtha, propane, light gases, and water. Fractionation and storage equipment separate, condition, store, blend, and load finished products.

Conclusion

HVO and renewable diesel plants use a broad equipment system that includes feedstock receiving, pretreatment, hydrotreating, hydrogen processing, heat exchange, separation, fractionation, storage, utilities, safety, automation, and environmental control. A reliable equipment design should begin with the feedstock profile and end with stable, on-spec renewable diesel production.

If you are sourcing reactors, separators, heat exchangers, storage tanks, towers, pressure vessels, or custom process equipment for HVO, renewable diesel, SAF, refinery conversion, petrochemical, or EPC projects, you can discuss your project requirements with an engineering and manufacturing team. Sharing feedstock data, plant capacity, process datasheets, material requirements, inspection needs, and delivery terms will support technical communication and fabrication evaluation.