NEED HELP new closed loop how to put in butane

Hi guys so I just got a closed loop extractor the mini 45 gram from best value vacs ( tried to put a link to it but I guess my account is to new to post links but if you got to best value vacs site and its called the mini 45 gram closed loop extractor. ) ok so I the tank that butane goes in and put it in a ice bath then pull a vacuum close valve then attach the hose that connects to the can tap then you supposed to use the can tap to pierce the side of the can after its pierce you open the valve and close the valve before you remove the can.... I haven't had much luck twice stuff started spraying all over and lost the vac also when I pierce the can I can hear a slight hissing escaping from the spot where it pierces the can is that supposed to happen or would that be air leaking in ruining the vacuum...I saw a video wher the guy didn't use the can tap and hose and used a plastic tip that vit into the valve itself and sprayed the can that way. is that a better way to go? I would think that doing that might also not be teh best "seal" and let air in I just keep loosing the vac can anyone explain the steps or any advice at all would really help!!!!

First, read and follow this:

https://web.archive.org/web/20150707132552/http://skunkpharmresearch.com/butane-safety/

To your questions, we pull a vacuum on the tank to remove the atmosphere. As soon as the butane enters and vaporizes in the vacuum, the vacuum is lost, and what you have left is the differential pressure between the can and the receiving tank.

If the can is ~110F and the tank is chilled below butane's boiling point, eventually the butane will find its way to the chilled tank and re-condenses.

Boiling point is suppressed as tank pressure builds, and tank pressure is determined by temperature. See attached chart.

In doing so, you will hear a hissing sound. When you stop hearing that hissing sound, shake the can while holding it and see if any liquid remains. When you shake the can without using a glove, shaking also vaporizes liquid butane and chills the can if any is present, which you can feel in your un-gloved hand. (Keep the clamp closed with your other hand).

The spraying all over the place part begs further questions, but in general it can occur when you first pierce the can if you don’t get a good seal. I find I get the least can flex and best seal close to the bottom where the metal is stiffer and opposite the weld.

The other place it can occur is if you release the clamp pressure with liquid butane still present in the can, or you forget to shut off the can tapper isolation valve first.