Rohr Damper
Vibration Dampers: the answer to vibration problems
ZetaQuest® Technologies, LLC has developed a range of vibration damping hardware for use with piping and other mechanical systems that is ideal for control of resonant vibration.
Rohr Dampers
- Excellent for frequencies of 18-290 Hz
- Easily clamps on to pipe up to 8″
- No connection to ground
Starr Dampers
- Larger systems with vibration up to ~60Hz
- Well suited to piping from 2” to 24”
- Connect to rigid structure or the ground
- Zero static stiffness
Rohr Damper Applications
Lower vibration and risk of failure
- Vents and drains
- Bypass lines
- Unsupported runs
- Other small-bore piping
- Up to 90% reduction in vibration at moderate to higher frequencies of 20Hz-290Hz.
- Eliminate resonances. Damping makes natural frequencies not responsive.
- Quick and easy installation. Readily clamps on standard piping up to 2″ NPS.
- Corrosion resistant. The damper housing is hard anodized.
- Excellent for Variable Speed Machines. Great way to eliminate blocked out speeds due to vibration.
- Need a wider range? Two dampers can be installed with different target frequencies.
Rohr Damper Selection
The devices are selected based on the damper mass and the target frequency range. The dampers should be selected to be about 15% of the “moving mass” of the pipe, with the 1.5 lb products ideal for vent and drain connections with cantilevered layout. Custom sizes are available upon request.
| Target Frequency, Hz | 21.2 | 30.0 | 42.4 | 60.0 |
|---|---|---|---|---|
| Min Freq, Hz | 18.1 | 25.6 | 36.2 | 51.2 |
| Max Freq, Hz | 25.6 | 36.2 | 51.2 | 72.4 |
| Target Frequency, Hz | 84.9 | 120.0 | 169.7 | 240.0 |
|---|---|---|---|---|
| Min Freq, Hz | 72.4 | 102.4 | 144.8 | 204.8 |
| Max Freq, Hz | 102.4 | 144.8 | 204.8 | 289.7 |
General Product Range
Sch40 Pipe with Single 150# gate valve at 30 Hz
| Pipe size | Rohr 1.5 | Rohr 5.0 | Rohr 20.0 | Rohr 50.0 |
|---|---|---|---|---|
| 1/4" | ✔ | |||
| 3/8" | ✔ | |||
| 1/2" | ✔ | |||
| 3/4" | ✔ | |||
| 1" | ✔ | |||
| 1 1/2" | ✔ | ✔ | ||
| 2" | ✔ | ✔ | ||
| 3" | ✔ | ✔ | ||
| 4" | ✔ | ✔ | ||
| 6" | ✔ | ✔ | ||
| 8" | ✔ | ✔ | ||
| 10" | ✔ | |||
| 12" | ✔ |
Heavier Pipe and/or Valves will require More Damper Mass
Small Bore Pipe Test Kit
ZetaQuest® Technologies, LLC offers a test kit for small bore piping vibration mitigation that includes 1.5 lb dampers and covers a range of applications from 15 Hz – 290 Hz. The kit can identify necessary damping hardware needed for any tubing or piping, easily connecting to a ½” tube (0.5” OD) up to 2” pipe (2.375” OD).
Starter kit
- includes the 21.2 Hz, 30 Hz, 60 Hz, and 120 Hz dampers
- ideal for fixed speed equipment
Complete kit
- includes all 8 models
- cover resonant frequencies up to 290 Hz.
The dampers can be mounted in any orientation, and the sizing is ideal for pipe runs with total pipe weight between spans of about 60 lb or 30 lb modal mass or less.
