engleski

European standard for round and sawn timber (method of measurement of dimensions) – influence on volume losses

This paper presents the research of volume losses of processed sessile oak (Quercus petraea (Matt.) Liebl.) butt-logs concerning the use of four different equations for assessment of timber volume. Log volumes were analysed and compared considering Huber's, Smalian's, Riecke-Newton's equation and Centroid sampling as opposed to the volume determined by the sectioning method. The test sample involved 225 butt-logs of sessile oak with the mean diameter ranging between 25 and 70 cm, i.e. 25 pieces in 5 cm diameter classes. The research included: 1) accuracy (and suitability) of the equations for the assessment of butt-log volume, 2) amount and structure of volume loss due to the prescribed method of measuring diameter and length of butt-logs considering EN 1309-2:2006 (E) standard and 3) analysis of volume loss due to undercuts, indicating that measuring butt-logs length from half of the undercut's height is questionable. Smalian's equation overlapped the average gained by the sectioning method by 13.2%, the Centroid sampling was down by 3.8%, Huber's equation downgraded by 6.6%, and Riecke-Newton's equation did not show any deviation from the sectioning method. There was a statistically significant difference between these volume measurement methods.

sessile oak, volume equations, butt-log, diameter rounding, length rounding, EN 1309-2:2006

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