Typical situation
A pizza plant is adding dust collection to an existing production line. Flour dusters along the line put excess flour into the air. The plan is to pick it up with capture hoods at the dusting points and carry it through new ductwork to an indoor dust collector, which discharges through a rotary airlock with a finger guard and a flex sleeve into a 55-gallon drum.
The ductwork has to fit around a line that’s already running: the conveyors, sheeter, sauce and topping applicators, and oven, plus the utilities and structure overhead. The layout needs real conveyor heights, hood locations, overhead utilities, and clearances, which old drawings rarely show.
What this scope includes
- Tier 1, scan. 7,500 sq. ft. at the standard-industrial rate: the production room with the line, the space where the collector will stand, and the overhead zone the duct routes cross. Setups run along both sides of the line, so conveyors and equipment are captured from more than one side and overhead utilities are captured from below.
- Tier 2, building. Floors, walls, ceilings, roof geometry where safely captured, stairs, doors, and building-access ladders for the full area, so the duct routes have their column lines and overhead clearances.
- Tier 3, process. Limited to the agreed 3,000 sq. ft. around the dusting points and the collector location: external geometry and major visible connections of the conveyors, sheeter, flour dusters, and sauce and topping applicators. The oven and cooling conveyor, outside the process area, aren’t modeled, and neither are utilities outside the agreed systems, such as lights and cable trays; they stay visible in the point cloud for clash checks.
- Tier 4, drawings. A plan of the production room, an equipment layout of the line, elevations along the duct route, sections at the dusting points and the collector location, equipment tags, and agreed layout dimensions, with one consolidated review round. Delivered as a PDF set plus editable DWG. These record existing conditions; the new hoods and ductwork are drawn as part of the separate design work below.
Designing the dust collection
The scan and model document what’s there today. The dust collection design itself, from hood locations and duct routing with blast gates to the collector and the rotary airlock, finger guard, flex sleeve, and drum at its discharge, is separate design work at the published hourly rates. The demo above shows it as proposed design, not scan data.
New hoods and duct routes are laid out against the model, then checked against the model and point cloud in Navisworks, so clashes with the line, utilities, and structure show up before anything is fabricated or installed.
Flour dust is combustible, so the final design follows the plant’s dust hazard analysis. The scan and model record existing conditions; they don’t establish code compliance.
What’s excluded
- The dust hazard analysis, airflow and duct-sizing calculations, and permit documents
- Fabrication drawings of the hoods and ductwork, which are separate scopes
- Equipment internals, including the inside of the oven and dusters, and detailed supports
Fabrication-critical tie-ins, flange locations, anchor bolts, and tight-clearance dimensions need separate verification before fabrication or installation, quoted separately. Verification rule