Top Ash Handling Plant Manufacturers in India for Industrial Needs

Every solid fuel boiler coal, rice husk, bagasse, biomass, or multi-fuel produces ash. For a 10 TPH rice husk boiler, that may mean 2–3 tonnes of fly ash per hour leaving the bag filter hoppers, plus bottom ash from the furnace grate. For a 50 MW coal-fired power boiler, it may mean hundreds of tonnes per day. In both cases, the ash does not stop at the hopper. It must be collected, conveyed away from the boiler area, stored, and either disposed of or utilised continuously, reliably, and without creating secondary problems like fugitive dust, hopper overflow, or blocked conveyors that force the entire plant offline.

An ash handling plant is not an optional environmental add-on. It is a core operational system that directly affects plant uptime, CPCB compliance, worker safety, and for plants selling fly ash to cement or construction users a direct revenue stream. Selecting the wrong manufacturer, or the wrong system type for the application, creates problems that are expensive to correct after installation. This guide covers what buyers need to know before approaching any ash handling plant manufacturer in India.

What Is an Ash Handling Plant?

Fly Ash vs Bottom Ash — Key Differences

How Does an Ash Handling System Work?

1. Combustion: Fuel burns in the boiler furnace. Ash separates into coarse bottom ash (falling through the grate) and fine fly ash (carried in the flue gas).
2. Fly ash collection: Flue gas passes through the ESP or bag filter, where fly ash is captured. It accumulates in the collection hoppers below the ESP fields or bag filter housing.
3. Bottom ash collection: Bottom ash falls into the bottom ash hopper or submerged scraper conveyor at the furnace base. Water cooling may be applied for high-temperature bottom ash before it enters the conveying system.
4. Ash conveying fly ash: Fly ash is evacuated from hoppers by pneumatic conveying (rotary feeders + pressurised conveying lines) in dense phase or lean phase mode, transporting the ash to the storage silo.
5. Ash conveying bottom ash: Bottom ash moves through a submerged scraper conveyor or drag chain to an intermediate storage hopper, then by belt conveyor or truck to the ash yard or disposal site.
6. Ash storage: Fly ash is stored in an ash silo with aeration pads to maintain flowability. Silo level sensors prevent overflow. Bottom ash is stored in a separate stockpile or ash pond.
7. Ash conditioning: Where fly ash is to be disposed of in an open yard or transported by road, an ash conditioner mixes water with the dry ash to raise moisture content (typically 18–25%) to prevent dust during truck loading and transport.
8. Loading/utilisation: Dry fly ash from the silo is loaded into bulk tankers for cement or concrete plant utilisation (highest value use). Conditioned ash is loaded by tripper or belt conveyor into dump trucks for disposal or low-grade construction use.

Ash Flow: Boiler Combustion → Ash Separation (Fly / Bottom) → Collection Hoppers → Pneumatic/Mechanical Conveying → Ash Silo / Stockpile → Conditioning (if required) → Loading → Utilisation / Disposal

Types of Ash Handling Systems

Major Components of an Ash Handling Plant

• Ash hoppers: Collection points below the ESP fields, bag filter housings, or furnace floor where ash accumulates before evacuation. Must be designed with adequate slope (typically 60°+) for free ash flow to the outlet.
• Rotary feeders (airlock feeders): Seal the hopper outlet from the pressurised conveying line while continuously metering ash into the conveying air stream. Critical sealing performance a leaking rotary feeder allows ash-laden conveying air to back-flow into the hopper.
• Pneumatic conveying lines: High-pressure pipes (typically mild steel or ceramic-lined at bends) that transport fly ash from hoppers to the silo. Bend wear is the most common maintenance point ceramic-lined bends last significantly longer in abrasive rice husk ash applications.
• Air compressors: Supply the conveying air for pneumatic systems. Must be sized for the actual air flow and pressure required not undersized to reduce capital cost, as this leads to persistent blockage and poor performance.
• Ash silo: Stores fly ash between evacuation cycles and truck loading operations. Equipped with aeration pads (fluidise ash to prevent bridging), level sensors, pressure relief vents with bag filters, and a cone discharge with a flow control valve.
• Ash conditioner: Mixes water with dry fly ash to raise moisture content to 18–25% preventing airborne dust during truck loading and transport. Twin-shaft paddle or drum-type designs are most common for industrial applications.
• Submerged scraper conveyor: Water-filled trough below the furnace grate that simultaneously cools and conveys hot bottom ash to the discharge end. Robust, reliable design for heavy-duty continuous service.
• Diverter valves and line valves: Direct ash flow between multiple conveying lines or silo inlets. Must be fully sealed when closed a leaking diverter valve allows uncontrolled ash bypass.
• Control panel / PLC: Manages the complete ash handling cycle hopper evacuation sequence, conveying pressure and flow monitoring, silo level control, compressor sequencing, and alarm annunciation. Automated operation reduces manual intervention and ensures consistent hopper evacuation without overflow.

Top Ash Handling Plant Manufacturers in India

1. Par Techno-Heat Pvt. Ltd. — Ahmedabad, Gujarat

Par Techno-Heat Pvt. Ltd. designs and manufactures ash handling plants as part of its Sustainable Solutions product range from its facility in Sanand, Ahmedabad. The company's ash handling systems are designed for integration with its industrial steam boilers (solid fuel fired rice husk, coal, biomass, bagasse), creating coordinated engineering between the boiler, air pollution control equipment, and the ash handling system. This integrated approach ensures the ash handling system is designed for the boiler's actual ash generation rate, ash characteristics, and discharge point layout rather than being sourced as a separate supply without engineering coordination.

Par Boiler's ash handling product scope covers ash conditioners, pneumatic ash conveying systems, and complete ash handling plant designs customised for the buyer's site layout, ash quantity, conveying distance, and storage requirement. The system is designed alongside the boiler and APC equipment simplifying commissioning and service accountability. For industrial boilers burning rice husk (very fine, abrasive, hygroscopic ash), biomass, or coal, this integration is particularly valuable as ash characteristics directly govern conveying system design and filter media selection in the bag filter.

What buyers should verify: Confirm the ash handling system design parameters match your boiler's actual ash generation rate at full load, conveying distance and elevation to the silo, ash temperature at the hopper outlet, and the required silo storage capacity for your operating schedule and truck loading frequency.

For more information on Par Boiler's ash handling plant range, visit: Par Boiler Ash Handling Plant

2. INDURE Pvt. Ltd.

INDURE has an established presence in the ash handling sector, primarily serving larger thermal power plants and industrial installations. The company has executed ash handling projects and offers end-to-end capability from design through commissioning and operations support. Their product range covers pneumatic conveying systems, bottom ash handling, and bulk fly ash storage and loading. Buyers should verify: Current project references, technology partners, and service network for your specific location before engaging. Information above is based on publicly available sources confirm current capabilities directly.

3. Macawber Engineering Systems India Pvt. Ltd.

Macawber specialises in dense-phase pneumatic conveying technology, which is one of the most technically demanding and commercially important ash handling technologies for fly ash. Dense phase conveying characterised by high pressure and low velocity reduces pipe wear significantly compared to lean phase, particularly important for abrasive fly ash streams from coal combustion. Their systems serve thermal power, cement, steel, and industrial boiler applications. Buyers should verify: Confirm whether dense phase is appropriate for your specific ash characteristics and conveying distances before specification.

4. Rollcon Technofab India Pvt. Ltd.

Rollcon supplies ash handling systems including dry and wet handling configurations. Their installations include industrial and power sector applications. The company has claimed installations across domestic and export markets. Buyers should verify: Reference installations at comparable capacity and ash type to your application. Confirm current operational status of references before visit.

5. ISGEC Heavy Engineering Ltd.

ISGEC is a diversified heavy engineering company with capability across boilers, pollution control, and ancillary systems including ash handling equipment for power plants. Their integration capability across large-scale EPC projects is relevant for buyers planning integrated boiler + APC + ash handling package procurement. Buyers should verify: Specific ash handling product scope and references for your application size.

6. Elecon Engineering Company Ltd.

Elecon Engineering has established capability in bulk material handling conveyors, stackers, and reclaimers that is relevant to the mechanical conveying elements of ash handling systems, particularly for large ash stockpile management in power plants. Their bulk material handling experience is relevant where mechanical conveying (belt conveyor, stacker) forms part of the ash handling scope. Buyers should verify: Specific ash handling project references and current product scope for your application.

Industries Using Ash Handling Systems in India

How to Choose the Right Ash Handling Plant Manufacturer

Ash Handling and Environmental Compliance in India

India's ash handling regulatory framework has two primary compliance layers: CPCB/SPCB environmental consent conditions for the air pollution aspects (fugitive dust from ash handling),and the Ministry of Environment,Forest and Climate Change(MoEFCC)Fly Ash Notification which mandates fly ash utilisation targets for coal-fired thermal power plants.

• Fugitive dust control: The ash handling system must prevent fugitive dust generation during ash conveying, storage, and loading. Sealed pneumatic conveying pipelines, enclosed silos with fabric filter vents, and enclosed ash conditioners are the standard approach. Open belt conveyor transfers with unenclosed discharge points are a consistent compliance risk.
• Fly ash utilisation: For coal-fired thermal power plants, MoEFCC fly ash notifications have mandated increasing utilisation targets. Plants must document and report fly ash generation and utilisation annually. A well-designed fly ash silo with dry bulk loading capability facilitates higher utilisation by making dry fly ash available for cement and concrete plant customers at the required quality.
• Ash pond management: Where ash ponds are used for wet ash disposal, they are subject to environmental conditions covering pond embankment integrity, seepage monitoring, and eventual closure and remediation. Many older plants are transitioning from wet ash ponds to dry ash handling systems specifically to improve environmental compliance and enable fly ash utilisation.
• Transportation: Uncovered trucks carrying unconditioned fly ash are a fugitive dust source. Ash must be conditioned or enclosed for transportation. SPCB inspectors specifically target ash transportation as a visible compliance indicator.

Fly Ash Utilisation — Converting Disposal Cost to Revenue

For industrial plants selling fly ash to cement manufacturers, concrete block producers, or road construction contractors, the ash handling system design directly determines the commercial value of the ash product:

• Dry bulk fly ash (highest value): Stored dry in the silo, loaded into bulk cement tankers. Requires a dry, sealed pneumatic conveying system from hoppers to silo, and a pressurised bulk loading spout at the silo base. This ash commands the highest price from cement plants.
• Conditioned fly ash (medium value): Moistened in an ash conditioner to prevent dust, loaded into dump trucks. Lower commercial value but simpler infrastructure. Used by brick manufacturers, fly ash brick plants, and embankment contractors.
• Ash pond disposal (no value): Wet slurried and pumped to a pond. No commercial value; creates a long-term environmental liability. Many plants are transitioning away from this approach.

The ash handling system design should be evaluated against the planned ash utilisation route because the difference in capital cost between a system optimised for dry bulk loading vs one designed only for conditioned disposal is typically smaller than the difference in annual ash revenue over 15–20 years.

Common Ash Handling Problems and Solutions

Ash Handling Plant Cost in India What Determines the Budget

The main cost drivers for an industrial ash handling plant in India:

• Ash quantity and number of hoppers: More hoppers and higher ash generation rate mean more rotary feeders, conveying lines, valves, and larger compressors directly increasing capital cost.
• Conveying distance and elevation: Longer conveying distances and higher silo elevations require higher compressor capacity and stronger pipe specifications significant cost driver for pneumatic systems.
• System type: Dense phase pneumatic systems have higher capital cost than lean phase but lower operating cost (compressed air consumption) and lower long-term maintenance cost (less pipe wear). For distances above 100–150 metres, dense phase is often lower total cost of ownership despite higher capital.
• Silo capacity and design: Silo volume, height, foundation, aeration system, and loading infrastructure are significant capital items. A silo sized for 24 hours storage at full load is substantially larger and more expensive than one sized for 6 hours.
• Automation and PLC: Full PLC automation with SCADA adds cost but reduces operating labour and improves reliability. For plants with 24-hour operation, automation is typically justified within 2–3 years of reduced labour cost.
• Civil and structural work: Silo foundations, hopper support structures, conveying pipe supports, and truck turnaround areas may not be included in the manufacturer's base quotation confirm the scope of civil work before comparing quotations.

Why Consider Par Boiler for Ash Handling Systems?

Par Techno-Heat Pvt. Ltd. offers ash handling systems as part of an integrated supply alongside its industrial boilers and air pollution control equipment. This integrated approach means the ash handling system is designed from the same engineering data as the boiler and APC systems ensuring the conveying capacity matches the actual ash generation rate, the hopper interface matches the APC equipment design, and commissioning involves a single engineering team familiar with the complete system.

For industrial boilers in the 2–15 TPH range burning rice husk, biomass, or coal, this integration eliminates the interface problems that arise when ash handling, APC, and boiler are sourced from separate suppliers without coordinated engineering. For boiler safety requirements that work alongside ash handling systems, see our boiler safety guidelines for industries. For more on Par Boiler's complete solutions range, see our guide on air pollution control solutions for industrial boilers and our FBC boiler working principle guide.

For a complete manufacturer evaluation framework when selecting any industrial equipment supplier including ash handling, see our boiler manufacturer selection checklist guide.
 

Frequently Asked Questions — Ash Handling Plant Manufacturers in India

1. What is an ash handling plant?

An ash handling plant is an engineered system that collects, conveys, stores, and disposes or utilises ash produced by solid fuel combustion. It manages two ash streams: fly ash (fine particles captured by ESP or bag filter hoppers) and bottom ash (coarser residue from the furnace grate or FBC drain). The system typically includes hoppers, rotary feeders, pneumatic or mechanical conveyors, ash silos, ash conditioners, and loading infrastructure. In India, ash handling plants are required for all solid fuel industrial boilers and power plants operating under CPCB/SPCB consent.

2. How does an ash handling system work?

Fuel combustion produces ash that separates into fly ash (captured in ESP/bag filter hoppers) and bottom ash (falling through the furnace grate). Pneumatic conveying systems evacuate fly ash from hoppers through conveying pipelines to the ash storage silo. Bottom ash is conveyed by submerged scraper conveyor or drag chain to the stockpile or disposal area. From the silo, ash is either loaded dry into bulk tankers for cement plant utilisation, or conditioned with water and loaded into dump trucks for disposal.

3. What is the difference between fly ash and bottom ash?

Fly ash is the fine particulate matter (1–100 microns) collected from flue gas by ESPs or bag filters. It is light, fine, and hygroscopic. Bottom ash is the coarser, heavier residue (1–50 mm) that falls through the furnace grate or FBC drain. Fly ash has higher commercial utilisation value (cement, concrete); bottom ash has more limited uses. They require separate handling fly ash by pneumatic conveying; bottom ash by mechanical conveying or wet sluicing.

4. Which are the top ash handling plant manufacturers in India?

Manufacturers with established presence include: Par Techno-Heat Pvt. Ltd. (Ahmedabad integrated with industrial boilers), INDURE Pvt. Ltd. (power plant systems), Macawber Engineering Systems India Pvt. Ltd. (dense phase pneumatic conveying), Rollcon Technofab India Pvt. Ltd., ISGEC Heavy Engineering Ltd., and Elecon Engineering Company Ltd. The best choice depends on your ash type, quantity, conveying distance, and system integration requirements with existing boiler and APC equipment. Independently verify all manufacturer capabilities before finalising.

5. What is dense phase pneumatic ash conveying?

Dense phase pneumatic conveying transports fly ash at high pressure and low velocity the ash moves as a dense plug rather than being suspended in the air stream. Low-velocity transport reduces pipeline wear significantly compared to lean phase, particularly for abrasive fly ash from coal or rice husk combustion. Dense phase uses less compressed air per tonne conveyed, reducing compressor operating cost. It is preferred for conveying distances above 100–150 metres and for abrasive ash types.

6. What is lean phase ash conveying?

Lean phase pneumatic conveying operates at low pressure and high velocity ash is suspended in the air stream. It is simpler and less expensive than dense phase, suitable for shorter conveying distances (below 100 metres) and smaller ash quantities. The trade-offs are higher pipeline wear at bends (requiring ceramic-lined bends for abrasive ash), higher air consumption, and potentially higher operating cost over the system's life compared to dense phase. For smaller industrial boilers with shorter conveying runs, lean phase is commonly specified.

7. How do I choose between pneumatic and mechanical ash handling?

Pneumatic conveying is preferred for fine fly ash enclosed, dust-free, suitable for dry ash to silo for utilisation, requires compressed air infrastructure. Mechanical conveying (submerged scraper, drag chain, belt conveyor) is preferred for coarser, heavier bottom ash submerged scraper conveyors handle hot ash with simultaneous water cooling. Most ash handling plants combine both: pneumatic for fly ash from APC equipment hoppers, mechanical for bottom ash from furnace discharge.

8. What is an ash conditioner?

An ash conditioner mixes water with dry fly ash to raise moisture content to approximately 18–25%, preventing airborne dust during truck loading and road transport. Without conditioning, dry fly ash disperses into dust clouds when loaded into open dump trucks creating fugitive dust that violates environmental consent conditions. Ash conditioners use twin-shaft paddle or drum-type designs for uniform moisture distribution. Conditioning is required unless fly ash is loaded in enclosed bulk tankers for dry utilisation.

9. What is a fly ash silo?

A fly ash silo is a vertical cylindrical storage vessel steel or concrete that stores dry fly ash between APC evacuation cycles and truck loading. It is equipped with aeration pads at the cone (fluidise ash to prevent bridging), level sensors (high-level alarm and low-level indicator), a pressure relief vent with dust filter, and a cone discharge with flow control valve. Silo volume is typically sized for 24–72 hours of fly ash generation at full boiler load, matching the plant's truck loading schedule.

10. What maintenance does an ash handling plant require?

Daily: verify pneumatic cycle operation, check compressor pressure, inspect rotary feeders for vibration or unusual noise, confirm ash conditioner water flow. Weekly: inspect pipe flanges for ash leakage, check compressor filters, verify silo aeration pads. Monthly: inspect rotary feeder tip clearance, check conveying pipe bends for wear, test silo level sensors, inspect ash conditioner paddles and wear liners. Annually: complete pipe system inspection, rotary feeder overhaul, compressor service, silo interior inspection.

11. How much does an ash handling plant cost in India?

Cost depends on ash quantity (TPH), number of hoppers, conveying distance and elevation, system type (dense vs lean phase vs mechanical), silo capacity, automation level, and civil scope. A small system for a 5 TPH biomass boiler may cost ₹15–40 lakh. A larger system for a 20 TPH coal boiler with dense phase, bulk loading, and full PLC automation may cost ₹80 lakh to ₹2 crore or more. Always request a project-specific quotation based on your actual design parameters generic price ranges are not reliable for budgeting.

12. What is the importance of fly ash utilisation?

Fly ash utilisation converts a disposal cost and environmental liability into a commercial product. Coal fly ash is used in cement manufacturing, concrete production, fly ash bricks, road embankments, and mine filling. Rice husk ash is used in ceramics, rubber manufacturing, and insulation. A dry ash handling system with silo and bulk loading infrastructure enables the highest commercial value utilisation dry bulk tanker loading commands the best price from cement plants, significantly exceeding the value of conditioned ash sold for disposal or low-grade fill. For guidance on optimising overall boiler system performance alongside ash handling, see our how to improve boiler efficiency guide.

13. Which ash handling system is best for rice husk boilers?

Rice husk ash (silica-rich, very fine, abrasive, and hygroscopic) requires pneumatic conveying through ceramic-lined bends from bag filter hoppers to a sealed ash silo. Rotary feeders and conveying pipe bends are the primary wear points specify hard-faced or ceramic-lined materials. Dense phase is preferred for longer conveying distances. An ash conditioner is standard where ash is disposed of by dump truck. Fly ash silo with bulk tanker loading may be warranted where rice husk ash has commercial value to ceramic or rubber manufacturers in your area.

14. Can ash handling systems be automated?

Yes. Modern ash handling plants use PLC-based automation as standard. The PLC controls the hopper evacuation sequence, conveying air pressure and flow monitoring, silo level management (triggering loading at high-level alarm), compressor sequencing, and alarm annunciation. SCADA integration allows remote monitoring and trending of key parameters. Automation reduces manual operator involvement, ensures consistent hopper evacuation without overflow, and provides an early-warning system for developing problems before they cause a stack emission exceedance.

15. What should I ask an ash handling plant manufacturer?

Key questions: (1) What ash quantity and number of hoppers is this design based on? (2) What conveying distance and elevation is assumed? (3) Dense or lean phase why for my ash type? (4) What compressor capacity and pressure is specified? (5) What silo volume and aeration system is proposed? (6) Are ceramic-lined bends included? (7) What commissioning scope and duration? (8) What spare parts should be stocked on-site? (9) What warranty covers what for how long? (10) Can you provide two references from similar ash type and capacity?

16. What industries use ash handling plants in India?

Ash handling plants are used in: coal-fired thermal power plants (large scale dense phase + submerged scrapers + large silos), rice mills (moderate scale lean/dense phase from bag filter + silo + conditioner), biomass power plants, cement plants, steel plants, sugar mills (bagasse ash), paper mills, textile mills, and waste-to-energy plants. System design varies significantly between sectors based on ash quantity, characteristics, and utilisation or disposal requirements specific to each industry and location.

17. How does ash handling reduce fugitive dust emissions?

A correctly designed and maintained ash handling system eliminates the main fugitive dust sources: sealed pneumatic pipelines prevent dust during transport; enclosed silos with fabric filter vents capture displaced air during filling; ash conditioners prevent dust during truck loading; enclosed loading spouts minimise dust at the loading point. Fugitive dust from ash handling is one of the most frequently cited SPCB compliance violations visible and easily inspected by enforcement officers without specialist testing equipment.

18. What happens if the ash handling system breaks down?

If ash handling fails, ESP or bag filter hoppers fill and overflow ash spills back into the flue gas path, causing immediate stack emission exceedance. Hot ash hopper overflow also creates a fire risk. The boiler load must be reduced or the boiler shut down if hoppers approach overflow level. Critical spares rotary feeder rebuild kits, ceramic bend sections, compressor filters should be maintained on-site to minimise restoration time. Mean time to repair a rotary feeder failure is the most commercially critical maintenance metric in continuous-operation plants.

19. Why should the ash handling system be designed with the boiler?

When the ash handling system is designed by the same team as the boiler and APC equipment, ash generation rate, ash temperature, hopper interface dimensions, and conveying capacity are all calculated from the same boiler design data not assumed from generic tables. Interface problems the most common cause of ash handling underperformance are eliminated by coordinated design. Commissioning is simpler with one team responsible for the complete system, and ongoing service accountability is clearer with a single supplier for boiler, APC, and ash handling.

20. What is the difference between dry and wet ash handling?

Dry ash handling: ash conveyed dry through pneumatic or mechanical systems to a storage silo, then loaded dry into bulk tankers or conditioned before disposal. Preserves fly ash quality for utilisation; no wastewater; suitable for commercial sale to cement or concrete plants. Wet ash handling (older approach): ash slurried with water and pumped to an ash pond. Simple infrastructure but destroys fly ash commercial value; creates ash pond environmental liability; high water consumption. Wet handling is being phased out under environmental pressure and fly ash utilisation mandates in India.

21. What is submerged scraper conveyor and where is it used?

A submerged scraper conveyor (SSC) is a water-filled trough below the boiler furnace floor, equipped with a continuously moving chain and scraper system that drags hot bottom ash through the water to the discharge end. The water simultaneously cools the hot ash (which may be at 300–600°C at furnace discharge) and prevents dust generation. SSCs are the standard bottom ash handling equipment for coal-fired power boilers and large industrial boilers with FBC furnaces. They are robust, reliable, and designed for continuous operation in demanding thermal environments.

22. What is the environmental regulation for ash handling in India?

Ash handling in India is governed by: CPCB/SPCB consent-to-operate conditions (specifying fugitive dust control requirements for ash handling areas), the MoEFCC Fly Ash Notification (mandating fly ash utilisation targets for coal-fired thermal power plants), and the Hazardous Waste Management Rules where applicable (for fly ash from certain waste-to-energy applications). Regulations evolve always verify current applicable requirements from your State PCB before designing the ash handling system, rather than relying on general guidance that may not reflect the latest amendments.

23. Can ash handling systems handle multiple boilers?

Yes ash handling systems are commonly designed to serve multiple boilers from a single conveying system, silo, and loading infrastructure. Multiple boiler hoppers are connected to a common conveying header, with individual isolation valves allowing sequential or simultaneous evacuation. The conveying system capacity must be designed for the combined peak ash generation of all connected boilers at full simultaneous load not the average load of individual boilers. A single silo serving multiple boilers reduces capital cost compared to separate silos per boiler, and allows more flexible truck loading scheduling.

24. How do I compare two ash handling system quotations?

Compare quotations on: (1) Completeness of scope are civil works, electrical, instrumentation, and commissioning included or excluded? (2) Design basis what ash quantity, temperature, conveying distance, and silo capacity is each quotation designed for? (3) Equipment specifications conveying system type, compressor capacity, silo volume, aeration design, automation level. (4) Materials of construction particularly for abrasive ash applications. (5) Warranty terms and spare parts. (6) Reference installations at comparable ash type and capacity. Price comparison is only meaningful when the scope and design basis are identical never compare headline prices across different scopes.