Biomass pellets are a precision-engineered fuel — but they're also hygroscopic, meaning they readily absorb moisture from the environment. The difference between a well-stored and a poorly stored batch of pellets can mean the difference between 4500 Kcal/kg and 3800 Kcal/kg effective heat output. Here is everything your facility needs to know about proper biomass pellet storage and handling.
The Core Rule: Keep Them Dry
Biomass pellets are manufactured with a moisture content of less than 10%. If exposed to rain, ground moisture, or high humidity environments, they will absorb water, swell, and disintegrate into sawdust — losing all their calorific value. The primary storage objective is simple: keep pellets completely dry and above-ground at all times.
Storage Options: Covered Shed vs. Silo vs. Bag Storage
1. Covered Shed Storage (Most Common for Medium Industries)
A standard covered storage shed with a concrete floor and waterproof roof is sufficient for most industrial facilities consuming 50–200 MT per month. Key requirements: minimum 1-foot raised platform, three-sided wall enclosure (or full enclosure in coastal areas), and a sloped roof to prevent water pooling.
2. Silo or Hopper Storage (Best for Large Consumers)
For facilities consuming 200+ MT per month, purpose-built metal silos or hoppers offer the best storage efficiency and lowest handling cost. Silos enable direct gravity-feed to the boiler, reducing labour cost. They must be fully sealed, with pressure-relief vents and moisture-control features.
3. Bulk Bag (FIBC) Storage
For smaller facilities or outdoor temporary storage, pellets are available in 1-MT jumbo bags (FIBC). These provide excellent protection when stored under a tarpaulin cover but should never be stacked more than 2 bags high due to pellet crush risk.
Fire Safety Requirements
While biomass pellets are far safer than coal from a dust explosion standpoint, they are combustible and can spontaneously generate CO gas during biological degradation if stored in enclosed spaces for extended periods. Essential fire safety measures include:
- Install CO detectors near enclosed storage areas
- Maintain adequate ventilation — never seal storage areas completely
- Keep fire extinguishers (dry powder type) accessible at all storage points
- Do not store pellets adjacent to open flame equipment
- Maintain FIFO (First In, First Out) stock rotation to prevent old stock degradation
Recommended Storage Duration
BBI pellets are designed for a 6–12 month shelf life under proper storage conditions. For optimal quality, we recommend maintaining no more than 45–60 days of inventory on-site, with scheduled JIT (just-in-time) deliveries from BBI aligned to your consumption rate.
Handling Equipment
Avoid belt conveyors with sharp angles (over 30°) as they can cause pellet breakage. Screw conveyors, bucket elevators, and pneumatic conveying systems are all suitable for biomass pellets. Minimize drop heights during transfer to reduce fines generation. Excessive fines (>5%) can reduce combustion efficiency and cause bridging in automated feeders.
BBI provides a complete site storage assessment as part of our customer onboarding. Contact our logistics team to get a custom storage layout recommendation for your facility.