On the left side manually fillable pellet storage with a capacity for 1000 kg of pellet. That amount lasts, depending on the consumption, weeks or even months. Screw conveyor (picture on the right side) transports the pellets to the boiler room.
Pellet Silo – a User Friendly Store
Pellets are very easy to store, because they take so little space. Pellets are stored in a pellet silo, as close to the boiler room as possible.
There are different kinds of silos on the market, from wooden to metallic. A budget-way to get a pellet silo is to build one yourself. You can use an old oil drum or a big, 500 litres’ wheelie bin.
Instructions for building your own silo (in Finnish) here:
On the left side a factory-made week silo. On the right side a self-made pellet silo, built into a wheelie bin, which holds 500 kg of pellets (one large sack). A self-made silo is a perfectly functioning option.
Requirements for a Silo
A storage silo has a steeply inclined bottom, so that the pellets can freely flow down to the screw conveyor. The silo must be durable, because pellet is a heavy fuel.
The silo must be absolutely dry and free of electrostatic charge. Pellets are not water-resistant, but disintegrate into sawdust in moist conditions. However, the silo does not need to be placed in a heated space. The silo must have a service hatch so that it can be serviced when needed. A plexiglass window is a nice accessory, so that the amount of fuel left can be checked.
If there is enough space and other resources allow, building or buying a static silo solution with the capacity for annual pellet supply is advisable. If needed, pellets can also be temporarily stored in a roofed outhouse.
The right silo size can be calculated here.
Realization and Equipment According to Need
When designing a silo, requirements as for the manner of filling the silo must be taken into account. The storage can be filled manually or with a pellet truck.
If the silo is filled from a pellet truck, the silo must have an outgoing air pipe and a connector compatible with the truck. This allows the truck blowing the pellets to discharge pressure, which is extremely important.
Protection against collision should be built inside the silo to prevent the pellets getting damaged when they enter the silo. The pellet truck blows the pellets into the silo, and if there is no protection, the pellets will fall apart. Protection can be built of strong rubber matting or an old tyre. Also, the silo must be built as tight as possible.
Taking Care of Precautionary Measures
It is life-threatening not to ventilate a silo properly. Be sure to ventilate the silo through the service hatch every time before going in.
Avoid going into the silo alone. The service hatch must always have a warning sign saying:
Warning! Before going into the silo make sure that there are no dangerous fumes or deprivation of oxygen.
Self-made pellet silo with wooden cladding.
Spa hotel’s pellet heating plant and silo.