Another batch of BHO today.30g each of BBG, WC, & GSC. Chopped and air dried for a few extra days down to 50% rh, so it weighed about 85g going into the tube. I kept to the method I used last time with 2 exceptions. I went back to using a silicone mat to line my pyrex pan. This time I used a warm water double boiler during the butane boil off. The boil off was quicker and more uniform so the double boiler appears to have merit. After the butane had drained, I closed the valves. I noticed a bit of ice in the material. After the liquid butane was gone I was able to pour off the water droplets. I put the mat in the vacuum chamber and the material behaved like I saw in the videos this time.
It took a couple of hours before a got round to bringing to tube in to clean it. I did not open either of the valves before taking off the clamp - bigggggggggg mistake. As soon as the clamp released, a sound like a pistol shot, the endcap/valve, gasket, and a shotgun blast of weed hits me in the chest. From the next room I hear, "What was that?" A few seconds later, "Are you alright?" Then the misses peeks round the corner and stares at me till she realizes that I'm ok. Then she burst out laughing. The kitchen and everything in it are covered in weed. It was even inside some of the drawers and cabinets. We spent the next 2-1/2 hours cleaning up the mess.
Now I'm not sure if I relieved all the pressure the first time of if pressure built up during the 2 hours the tube was sitting outside with the valves closed. Either way - note to self - open the valve before removing the end clamp dumbass! Not sure how much pressure it was but I'm sure it was less than 5psi. Sure glad it wasn't more!