Classification Wood Fuel Wales - your one-stop source for wood-fuel information.

Classification

Woodchip fuel varies in terms of moisture content, size and grading (range of sizes). The specification required will depend on the boiler, although in general larger systems are more tolerant of variable quality. British Biogen, the trade body for the biomass energy sector, have developed a classification system to assist buyers and suppliers of fuel. They propose three grades defined by the range of chip sizes :

Super Grade Wood Chip: (2 - 25 mm) This is a very tightly defined wood chip, with a total absence of larger material to avoid blockages in fuel feeding systems. Specialised chipping and screening facilities will be required for its production.

Fine Grade Wood Chip: (2 - 50 mm) This is likely to be the most widely used retail chip grade, being suitable for the majority of small-medium scale woodfueled equipment. This grade is achievable with selected chippers and/or basic screening.

Coarse Grade Wood Chip: (2 - 100 mm) This grade is likely to be popular in the self-supply sector and in some retail sectors. Most automatic plant will operate acceptably on this grade, however occasional blockages can be expected. The lower price of this readily produced fuel will compensate for the extra intervention required.. A wide range of chipping equipment including many mobile chippers can produce fuel to this grade without screening.

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Classification Woodchip fuel varies in terms of moisture content, size and grading (range of sizes). The specification required will depend on the boiler, although in general larger systems are more tolerant of variable quality. British Biogen, the trade body for the biomass energy sector, have developed a classification system to assist buyers and suppliers of fuel. They propose three grades defined by the range of chip sizes : Super Grade Wood Chip: (2 - 25 mm) This is a very tightly defined wood chip, with a total absence of larger material to avoid blockages in fuel feeding systems. Specialised chipping and screening facilities will be required for its production. Fine Grade Wood Chip: (2 - 50 mm) This is likely to be the most widely used retail chip grade, being suitable for the majority of small-medium scale woodfueled equipment. This grade is achievable with selected chippers and/or basic screening. Coarse Grade Wood Chip: (2 - 100 mm) This grade is likely to be popular in the self-supply sector and in some retail sectors. Most automatic plant will operate acceptably on this grade, however occasional blockages can be expected. The lower price of this readily produced fuel will compensate for the extra intervention required.. A wide range of chipping equipment including many mobile chippers can produce fuel to this grade without screening. <<< Previous: Fuel quality Next: >>> Boilers	SEARCH Find a supplier In this section Technical Wood fuel for a better landscape Sustainability Local jobs for local people The cleanest fuel Where to buy wood fuel How to burn wood Chimneys Wood fuel costs Logs & Firewood Wood Chip Supply options Fuel quality Classification Boilers Fuel handling Fuel storage Wood pellets Storage and Delivery Electricity Contact us Unit 7 Dyfi Eco Park, Machynlleth, Powys SY20 8AX (+44) (0)845 456 0342
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