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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.
A leak-free system substantially increase the volume of sap collected. The benefits of increased sap flow in artificial vacuum systems are found throughout the season, but are best realized during poor sap flow days. Artificial vacuum systems do not pull or suck maple sap from the taphole; The process is more complex.Sap flow is generally initiated as temperatures rise above freezing. along with an associated increase in sap pressure within the tree. leak-free system substantially increase the volume of sap collected. The benefits of increased sap flow in artificial vacuum systems are found throughout the season, but are best realized during poor sap flow days. Artificial vacuum systems do not pull or suck maple sap from the taphole; The process is more complex.