high vac. releaser?

[gentlemanfarmervt]

in the new cdl cat. they list all releasers as (high vacuum) does this mean they wont work, on say, 12-15"? Only asking because we wish to switch to vac. next season and in need of releaser for our small 7 cfm pump and dont know what to get?

[gentlemanfarmervt]

with my existing system all setup gravity i obviously understand the benefits of introducing vacuum. High or low vacuum is the question. Continuous vacuum? what kind of yield differences are we talking? Ive got my eye on a Delaval 84 vacuum pump (about 120cfm) i guess, and the continuous releaser, but what kind of inch/lbs are we talking? Would this generate high vacuum? Expecting 4000 taps in the not to distant future would this be suffice? Any assistance appreciated as usual thanks.

[unc23win]

I think high vac releaser means that it can handle higher levels of vacuum not that they necessarily require high vac levels.

Most DeLaval pumps will produce 26 inches of vacuum closed meaning with nothing hooked to them and the max CFM is rated at 15 inches. That pump is plenty for 4,000 taps but it probably won't do 26". As you decrease the desired vacuum level the CFMs it can do will increase. If you look at the link attached you can get an idea of how it changes. The only way to achieve 27 or 28" is with a two stage rotary vane pump.

http://www.sugaringequipment.elapierre.com/produits_en.asp?id_categorie=298&id_groupeproduit=424&page=1

This is the repsonse I got from Carl Lapierre a while back.

Usually pumps are rated at 15 in/hg but some company rates their pump at acfm… (w/o any vacuum)

The formula to get approx cfm is quite simple, you take the rated ACFM of the pump lets go with 100 at no vacuum.

The you divide that 100 by 30 (should be 29.9) then you multiply the result by the difference of vacuum, if you want to know how much cfm is left at 20 in/hg, you substract 20 from 30, your left with 10, so (100 / 30) * (30 – 20) = 33.3 cfm

If the pump is really rated 100 cfm @ 15 in/Hg, it means its 200 acfm so again (200 /30) * (30 – 20) = 66.6 cfm

From there you just need to find out if it is rated at no vacuum or at 15 in/Hg

[Walling's Maple Syrup]

You can achieve high vac with a single stage pump if your woods are tight. It doesn't have to be a vane pump either. I have a 75 cfm. liquid ring Indiana vac running 4400 taps and 2 releasers and I have been pulling 27.5" all year. Leak free woods are very important when it comes to running high vac. no matter what size pump you use. Neil

[TheMapleMoose]

We've got a single stage rotary vane pulling 27" at the releaser 1600' away. We've got a cooler kit on out Airablo pump to achieve this. Don't be afraid to oversize your pump a bit. Even up to 50 taps per CFM isn't a bad idea...especially if you plan to lift or get 4000 taps worth of pipe to charge.