Using smaller-diameter tubing can create a natural vacuum which can increase sap production. This article details some research into this method of sap collection, and offers tips on some practical applications.
Showing 11 – 19 of 19 resources
Using 3/16″ tubing can create non-mechanical vacuum that can increase sap yield.
The overall objective of this work was to determine whether existing Conservative Tapping Guidelines are appropriate and likely to result in sustainable outcomes when used with sap collection practices that result in higher sap yields.
Gravity tubing systems are widely used in many small to mid-sized operations throughout the maple region. This article summarizes the past 3 years of my research on gravity tubing, or tubing without a vacuum pump.
A spreadsheet to calculate costs and returns of using vacuum sap collection systems.
This research was designed to examine age-related losses in sap yield in tubing systems operated under vacuum, and to explore different strategies to reduce tubing microbial contamination induced sap yield losses.
A presentation on the effects of vacuum on sap yield and ways to optimize tubing systems.
A vacuum pump attached to a well-designed tubing system will significantly boost sap flow compared to gravity sap collection, by increasing the difference in pressure between the tree, the source of the sap, and the tubing, where we want the sap to flow. A vacuum pump, however, will not deliver much, if any, vacuum to the trees if the tubing system is not tight and leak-free. This article gives basic instructions on how to check for those leaks, and how to fix them.
Questions of how vacuum affects maple sap, syrup and trees have existed for many years, and these issues are perhaps more important today than ever before due to the increasing use of collection systems that can achieve very high levels of vacuum. This article will describe recent research performed at the University of Vermont Proctor Maple Research Center that was designed to answer questions about high vacuum.