![]() Operating conditions | | Airflow velocities, f.p.m.įor objects | Crossdraft, |_ TABLE D-57.7 - MINIMUM MAINTAINED VELOCITIES INTO SPRAY BOOTHS An adequate air replacement system is one which introduces replacement air upstream or above the object being sprayed and is so designed that the velocity of air in the booth cross section is not less than that specified in Table D-57.7 when measured upstream or above the object being sprayed. Over 19 (48.26).| 25 | 1 | 6 | 880 | WhenĮntry loss = 0.45 velocity pressure for tapered takeoff.Įxcept where a spray booth has an adequate air replacement system, the velocity of air into all openings of a spray booth shall be not less than that specified in Table D-57.7 for the operating conditions specified. Minimum slot velocity = 2,000 ft/min - ½-inch (1.27 cm) slot width.įigure D-57.7 - Horizontal Double-Spindle Disc Grinder Exhaust Hood and Branch Pipe Connections Over 30 (76.2).| 30 | 2 | 5 ½ | 1,480 |Įntry loss = 1.0 slot velocity pressure + 0.5 branch velocity pressure. Over 53 to 72 (134.62 to 182.88) | 2 | 3,140 | 5 | 6,010ġNumber of exhaust outlets around periphery of hood, orĮqual distribution provided by other means.įigure D-57.1 - Vertical Spindle Disc Grinder Exhaust Hood and Branch Pipe Connectionsĭia. TABLE D-57.5 - VERTICAL SPINDLE DISC GRINDERĭisc diameter, inches (cm) | | Exhaust| | Exhaust The hoods shall be connected to one or more branch pipes having exhaust volumes as shown in Table D-57.5. Grinding wheels or discs for vertical single-spindle disc grinders shall be encircled with hoods to remove the dust generated in the operation. | 6 (15.24) | 1,200įor any wheel wider than wheel diameters shown in Table D-57.1, increase the exhaust volume by the ratio of the new width to the width shown. Wheel diameter, inches (cm) | inches (cm) | volume TABLE D-57.1 - GRINDING AND ABRASIVE CUTTING-OFF WHEELS The entry loss for the vertical-spindle disc grinder hood is shown in figure D-57.1 (following paragraph (g) of this section). The entry losses from all hoods except the vertical-spindle disc grinder hood, shall equal 0.65 velocity pressure for a straight takeoff and 0.45 velocity pressure for a tapered takeoff. Grinding wheels on floor stands, pedestals, benches, and special-purpose grinding machines and abrasive cutting-off wheels shall have not less than the minimum exhaust volumes shown in Table D-57.1 with a recommended minimum duct velocity of 4,500 feet per minute in the branch and 3,500 feet per minute in the main. ![]()
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