In my first post on this forum, I asked about about making a dust collector and got really good advice - Dust Separator 101. I'm now looking to buy a container to fit with a Thien Separator. I will be using a 1 HP shop vac. A couple of questions: 1) does the size of the container make a difference, assuming that it is well-sealed? Looks like I can get a drum anywhere from 12 gal. up through 50 gal. 2) the vac hose is about 1.5 inches. With 1 HP, will it be able to draw enough to use 4" tubing? Alternatively, if I use 2" tubing, am I likely to have clogging?
Thanks for all the terrific information on the forum. I'm entering a new world here, and you are providing maps!
Okay... (Hightlighted in red
) You have my curiosity. You mentioned 1.5" vacuum hose and 1HP...
Let me explain my curiosity on that: With that small of hose then saying 1HP, I'm thinking you are referring to a shop vacuum instead of a Dust Collector.
My concern there, making it personal to me and what I have... I have a 2HP Wet Dry Shop Vac. It has 1-1/4" Hose and doesn't move much air. It does okay vacuuming through 1-1/4" vacuum attachments, hooked to a router or Miter saw, but not much else. The vacuum in inches isn't very good on it either. In fact I wonder why I still keep it around, except that it is small and portable. I can take it to jobsites.
Then I have a commercial truck mount wet/dry vacuum. It came with 2" hose. It has 2-stage impellers and pulls 105 inches of vacuum. Just about enough to suck up a bowling ball... Enough that It started to collaspe a steel 35 gallon drum when I was testing it. Motor wise it is 1.8HP. Vacuum wise, it pulls 104.6 inch W/L at 113.9 CFM. If I hook it to a 4" line, the throughout is less. Sort of like doing hydraulics and going from a small cylinder to a large... the "area" affected decreases. It does great on all things I have except my planer and my cabinet saw. This I have set up filtered on top of a 35 gallon barrel with the input hoses setup as a cyclone in the barrel... What it doesn't have in CFM, it makes up for in high vacuum pressure.
Then I have the dust collector. 2HP motor, 7-10 w/l, 1250cfm. It can do any DC needs I have. It doesn't have a lot of vacuum pressure (most DC's don't.) But it has mass airflow.
So all 3 of those say they are rated at around 2HP. There are big differences between those 3. Dust collection itslef works with the particles being suspended in the air as it travels... then separates in the cyclone or theil from centrifugal force and the decrease in air speed, causing the particles to loose suspension and separate from the air...There is actually some physics involved with that and you can tune your separator by regulating the airflow through it. Not enough or too much airflow and the separator doesn't work as well. (And yes, the separator needs to be airtight for it to work.)
So back to that curiosity- What are you using as your vacuum source? If it doesn't have a high enough vacuum pressure -or- high enough CFM, then it won't be able to suspend and carry high volumes or dust or shavings through the hose (will build up and clog).
EDIT-- Example of a disconnect in HP "ratings" for shop vacs: 20 gallon shop vac says it's rated at 6.5 peak HP. But 110volt @ 1200 watts calculates out to 1.046 HP (electrical hp).