Tripel with Wyeast 3787 fermenting VERY slowly

I brewed a Belgian Tripel on 9/26, the OG was 1.082. I used a 650 mL starter with Wyeast 3787 Trappist High-Gravity yeast. The yeast had been in my fridge a few weeks, and the pack had swelled somewhat before I made the starter. The fermentation got off to a very slow start, even though the temp was about 73 degrees. After 6 days of very slow fermentation with minimal krauzen, I pitched a second (non starter) swollen pack of 3787 high gravity. I've had 3 inches of dense krauzen on top ever since 10/1, it's now 10 days later and still have heavy krauzen. I get a bubble in the airlock every 20 seconds or so. This is the slowest I've ever had a beer ferment, the temp is 74 degrees and I have not taken a gravity reading since the initial pitch. The wort was heavily airated right before the initial pitch. Should I be concerned about this very slow pace?

Inadequate seal around your airlock?? Since you've had kraussen and some airlock activity the entire time, I would think that everything is A-OK.

3787 likes high temps. If you check the gravity and it is still too high, try raising it to the upper 70s-low 80s and it will probably kick right back up. That yeast shines at those temps.

It seems as though the airlock seal is tight...I'll try raising the temp and see what happens.

Take a hydrometer reading, and don't freak out, in any case. Triples are high gravity beers and as nutrients dwindle and alcohol %age increases, it becomes a really toxic environment for the yeast. They'll tend to slow down as the weaker cells drop out and they hack through those last few points of gravity. A 650ml starter was probably too small, too.

I just made a Tripel on Friday and I am seeing similar results. Pitched a 2000mL starter with Wyeast 3787 and it's been a slow start. I finally have Krausen and airlock activity after shaking the carboys several times to mix everything up. Temp is about 70, so it may be too low. I will keep an eye on it and see if it gets going now that it has taken hold.