I just recently realized that I never wrapped this blog up. So today I will add some pics of the final installation and a few notes about our trials and travails to GC this project in-house, with a second hand system.
Here it is from the outside….
In this pic you can see the tower, the 28” diameter “suck pipe” coming out of the building and the material transport loop, which has it’s own blower and transports the debris that drops out of the rotary air lock (think departments store revolving door) into a modified tractor trailer. We sell the dust/chip debris to a wood pellet plant and empty it every 6 – 8 weeks. We have to maintain two modified trailers in road worthy condition, but because we haul them ourselves, we get paid ~ $1,000 per load.
Here you can see how the material transport loop goes into and returns air from the trailer.
Here you can see the 60 HP blower, the discharge muffler/silencer, and the photo eye sensor (red) that signals the alarm box to switch the abort gate. The silencer was not part of our original plan, until we fired up the blower and heard how loud a 20,000 cfm blower really is. It is a custom engineered device that cost us $4,500. But it really works. You can stand next to the blower and have a conversation without raising your voice, and noise level inside the shop is lower than with our previous system, which only moved 9,000 cfm (on it’s best day).
Here you see the high speed abort gate up on the roof. Return air is normally sent back into the shop (try heating a 20,000 s.f. shop in January when you’re continually sucking 20,000 cfm out of it. The ceiling is 14’ tall so that means the atmosphere is completely exchanged in 14 min.). When the alarm system senses fire in the return air pipe, the abort gate de-energizes an electro magnet and the gate slams into the bypass position in less than 500 msec.
-- Pine is fine, but Oak's no joke!