Wood chip specifications for biomass plants and boilers

The wood chips we ship run about 2,200 Kcal/Kg at roughly 43% moisture, in two sizes: 10 mm and 30 mm. Those three numbers are everything your boiler cares about. The rest of this explains why they are what they are.

What a wood chip is

Logs and offcuts run through a chipper and cut to a set size. Used in biomass power plants and boilers built to burn solid fuel on a continuous feed — not a finely milled fuel like pulverised coal.

Our feedstock is rubberwood and mixed hardwood, screened for soil and foreign matter before every batch is chipped.

The three specs to agree before you order

Spec	What we ship	Why it matters
Chip size	10 mm or 30 mm	Has to match the feed system. Oversized jams the auger; undersized blows around and burns off too fast
Moisture	~43%	Sets how much fuel you need per unit of heat, and whether the furnace runs hot enough to drive the water off
Calorific value	~2,200 Kcal/Kg	Tells you the tons per hour needed for your steam demand

Forty-three percent sounds high. It is normal for chips that have not been kiln dried. What matters is not the lowest possible figure but consistency between batches — if moisture swings, furnace temperature swings with it, and your operator spends the shift chasing air settings.

10 mm or 30 mm

Calorific value and moisture are identical. Size is the only difference.

Take 10 mm for small to mid-size boilers, narrower augers, or where you want fast ignition.

Take 30 mm for biomass power plants and large boilers feeding high volume per hour. Bigger chips move through conveyors more smoothly and throw less dust.

Against pellets

Rubberwood pellets run about 4,000 Kcal/Kg at roughly 9% moisture — nearly double the heat per kilogram, at a considerably higher price per ton.

Chips are usually cheaper per unit of heat. If you have yard space and a boiler rated for high-moisture fuel, chips are the answer. If space is tight or you feed by auger, pellets earn their premium.

Check three things before the first load

1. What size does your feed system actually take? Measure the auger or conveyor. Do not trust a spec sheet bought ten years ago.
2. How many tons will your yard hold? Chips take up far more volume than coal of equivalent heat. Plan for it.
3. Can you receive a full load? We ship 28–31 tons per trip. If the yard cannot take a trailer or has nowhere to tip, we need to know before scheduling.

Ask about your boiler

Send your boiler spec and the steam you need per hour. We will work out the tonnage per month and which size suits your feed system. Call +66 92 392 2292.