GUIDE OF SEISMIC BRACE FOR PIPE RACK
(REV.2 2006.11.14)
The guide is used to restraint seismic for pipe and duct racks in AMAT project. The guide follow the UBC1997 regarding non-structural seismic design section.
For single pipe including pipe /duct /conduit, the brace space must be not more than 12m in latitudinal way, and not more than 24m in longitudinal way.
For pipe rack that composed with angle or channel, if the entire pipes diameter is less than 100mm, the brace space must be not more than 12m in latitudinal and longitudinal way. If the entire pipes diameter is between 100mm to 200mm, the brace space must be not more than 6m in latitudinal and longitudinal way. And the latitudinal and longitudinal brace need be installed at the each end of the pipe run.
You can find the tension of brace and member size of the brace that I recommendate per pipes weight in the table below. Before the installation of the brace, the subcontractor need get the material report to testify the load-carrying capacity of member and connection are more than the tension of brace that show in the table below. The angel of the brace should be between 350 to 550.
Seismic force of brace for single pipe:
Pipe weight Wp (kg/m) | Tension of brace 1 (kN) | Tension of brace 2 (kN) | Stainless steel rod (fy= 890Mpa) | Q235 rod (fy= 210Mpa) | Grade 8.8 bolt (ft= 400Mpa) |
10～20 | 4 | 8 | Ф6 | Ф6，Ф8 | M10 |
20～50 | 10 | 19 | Ф6 | Ф8，Ф12 | M10，M12 |
50～100 | 19 | 38 | Ф6，Ф8 | Ф12，Ф16 | M12，M16 |
100～200 | 37 | 74 | Ф8，Ф12 | Ф16，Ф22 | M16，M20（2M16） |
Seismic force of brace for pipe rack (applicable to brace space < 12m):
Pipe weight Wp (kg/m) | Tension of brace 1 (kN) | Tension of brace 2 (kN) | Stainless steel rod (fy= 890Mpa) | Q235 rod (fy= 210Mpa) | Grade 8.8 bolt (ft= 400Mpa) |
10～20 | 4 | 4 | Ф6 | Ф6 | M10 |
20～50 | 10 | 10 | Ф6 | Ф8 | M10 |
50～100 | 19 | 19 | Ф6 | Ф12 | M12 |
100～200 | 37 | 37 | Ф8 | Ф16 | M16 |
Pipe weight Wp (kg/m) | Tension of brace 1 (kN) | Tension of brace 2 (kN) | Stainless steel rod (fy= 890Mpa) | Q235 rod (fy= 210Mpa) | Grade 8.8 bolt (ft= 400Mpa) |
10～20 |
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The pipes and ducts without anti-seismic requirement are below:
A. Utility that weight is less than 180kg.
B. φ< 25mm coal gas pipe and φ< 60 mm electrical conduit
C. Area < 0.38 m2 rectangular and
