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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.
Most service trucks are equipped with vacuum pumps capable of pumping 5 or 6 cu.ft. per minute. On installations larger than 20 hp, you may need to use a larger capacity pump or more than one pump in order to work efficiently. Pressure test the system to be evacuated with dry nitrogen and a trace charge of refrigerant.