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Abstract. Yields of sugar maple sap collected from three plastic pipeline systems by gravity, vacuum pump, and a vacuum pump with a transfer tank were compared during 2 years in northern Vermont.The transfer system yielded 27 percent more sap one year and 17 percent more the next year.Higher vacuum levels at the tapholes were observed in the transfer system.he transfer system yielded 27 percent more sap one year and 17 percent more the next year. Higher vacuum levels at the tapholes were observed in the transfer system.
Non Technical Summary. Maple sap yields typically decline each year after a mainline and tubing system is installed. The causes for this decline are unclear, however the difference between yield in the first season and yield after 5-10 years of operation can amount to 50% or more.on Technical Summary. Maple sap yields typically decline each year after a mainline and tubing system is installed. The causes for this decline are unclear, however the difference between yield in the first season and yield after 5-10 years of operation can amount to 50% or more.