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20.07.2020Remember Me. There are two phases to designing your dust collection system: The first phase is sizing your duct work for adequate volume and velocity of flow for the type of dust you will be creating; and the second phase is computing the static pressure SP of your system to determine the size and power of your dust collection unit.
Prior to making your calculations, diagram the floor plan of your shop to scale on graph paper. Include the size and location of each machine, and the location of its dust port or outlet; the floor to joist dimension; the location of the dust collecting unit; and the most efficient fewest number of turns or bends path for routing your duct lines.
This is also a good time to start your take-off list of duct components for your system. Below this minimum FPM, particles will begin to settle out of the air stream, forming clogs—especially in vertical runs. Table see below shows the minimum FPM that Spiral Manufacturing recommends for several types of dust in branch and main runs.
From the Table determine the velocity FPM of your system for the type of dust that will be produced. For the purpose of the following examples assume woodworking dust.
Determine the diameter of each branch line. You can use the diameter of a factory installed collar or port, or consult the manufacturer. Convert metric ports to the nearest inch. Convert rectangular ports to the equivalent round diameter. Record any reducers or rectangular to round transitions on your take off list. Using Table , determine the CFM requirement of each branch.
Remember the FPM for wood dust in branch lines is Identify your primary or high-use machines. These are the machines that operate simultaneously on a frequent basis. The objective here is to define your heaviest use scenario so you can size your system to meet it.
Including infrequently used machines and floor pickups in your calculations will only result in an over-designed system that will cost more to purchase and to operate. At this point, all of your branch lines are sized, and you have a list of all components required for your branch lines. Now you are ready to Dust Collector System For Woodworking Shop size the main trunk line. Begin with the primary machine that is furthest from where you will place the dust Table Saw Primary Radial Arm Saw Woodworking Shop Dust Collection Design Uk Dust collecting unit.
Note: If a non-primary machine or pick-up is added to the system between primary machines, the size of the run is not increased.
This not only assures adequate air flow but also anticipates a future upgrade in machine size. In this step, you calculate the Static Pressure SP or the resistance of your system that your dust collection unit must overcome. To do this you total the Static Pressures of the following system component groups:.
See "Give dust a straight shot to the collector" below. Better still, raise the collector until the main duct leads straight into the inlet. DON'T create long duct runs. A single duct of 30' or more that wraps around more than two walls of a shop reduces air velocity and increases the risk of dust buildup. Instead, hang one shorter main duct, with diagonal branches leading to the tool drops. You need to cut a big arc or wheel out of a sheet of plywood, but you know that a handheld jigsaw Skip to main content.
Avoid common duct-design flaws. This reducer connects to corrugated hose or narrower duct. Connecting clamps let you reconfigure this type of metal duct. Facebook Pinterest Twitter Text.
Printer-friendly version. Read more about Dust Collection or Dust Collection. The Lowdown On Dust Separators. Ductwork-Worthy Dust Collectors. Dust Collectors. Air-Filtration Systems. For more related content, subscribe to our newsletter! Routing Ovals With an Ellipse Jig.
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