Bubble Tight Isolation Dampers
To isolate filtration trains during shutdown
BDT Series Isolation Damper
The BTD is designed for the isolation of critical filter trains or environmental emission control systems during change-out, decontamination, shutdown, and/or testing services without disabling the entire system or risking air emissions that could affect compliance. Damper operation can be manual or electric. Dampers can be manufactured out of 304 stainless steel. Other materials are available upon request.
Bubble Tight Isolation Dampers can be used in:
- Room isolation
- Containment housings
- Dust collectors
- HVAC
- Building isolation systems
ANSI Bubble Tight Certification
The damper is also available with a bubble tight certification per ANSI test method N510-1980. In a hazardous atmosphere, the Series BTD Isolation Damper enables the system to be isolated for decontamination, filter change-out or to allow scan testing by an auxiliary air supply system. In a nonhazardous atmosphere, it prevents particulates or vapor phase chemical contaminates from reaching the atmosphere or other equipment and processes to which the system being isolated may be connected.
BTD Design Specifications
Round or Squared Duct
BTD Isolation Dampers are available for either round or square duct in temperatures ranging from -50º F to 375º F. The damper is designed with a single blade mounted to a shaft with a fabricated flange frame. The damper contains a full circumference silicone blade seal that is retained by a steel clamp ring fastened by hex nuts. Manual or electric actuators can be supplied as required.
The blade seal is field adjustable and replaceable. The shaft is supported in self-lubricating TFE lined filament wound bearings mounted external to the damper frame with O-ring shaft seals.
Standard sizes range from 8″ to 36″ round and custom sizes are also available.
The square BTD attaches directly to the containment housing, which eliminates the need for transitions between the housing and damper as is required when using the round BTD. Damper housing is 24″ square duct with a flange total width of 27″; a total flange height of 30″; and adds 26½” to the length of the containment unit. Damper operation can be manual, electric, or pneumatic.
BDT Series Bubble Tight Isolation Damper Dimensional Chart
Please refer to fig. 1 above
| A | B | C | D | E | |||
|---|---|---|---|---|---|---|---|
| Inside Diameter (inches) | Bolt Hole Diameter (inches) | Bolt Hole Quantity | Bolt Hole Cirlce Diameter (inches) | Flange (inches) | Width (inches) | Depth (inches) | Approx. Weight (lbs.) |
| 8 | 7⁄16 | 8 | 10 | 1½ | 11 | 9 | 32 |
| 10 | 7⁄16 | 12 | 12 | 1½ | 13 | 9 | 40 |
| 12 | 7⁄16 | 12 | 13¾ | 1½ | 15¼ | 9 | 47 |
| 14 | 7⁄16 | 12 | 16 | 1½ | 17 | 9 | 55 |
| 16 | 7⁄16 | 16 | 18 | 1½ | 19 | 9 | 57 |
| 18 | 7⁄16 | 16 | 20 | 1½ | 21 | 9 | 65 |
| 20 | 9⁄16 | 20 | 23 | 1½ | 24⅜ | 9 | 64 |
| 22 | 9⁄16 | 20 | 25 | 1½ | 26 | 9 | 88 |
| 24 | 9⁄16 | 24 | 27 | 1½ | 28⅜ | 9 | 98 |
| 26 | 9⁄16 | 24 | 29 | 2 | 30 | 9 | 98 |
| 30 | 9⁄16 | 24 | 32½ | 2 | 34 | 12 | 140 |
| 36 | 9⁄16 | 32 | 38½ | 2 | 40 | 12 | 197 |
| Larger & Custom sizes are available | |||||||
Resources
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