Floating Barriers consist of a top flotation boom, an impervious fabric skirt extending downward under water, and a heavy galvanized steel chain sealed into a hem along the bottom of the skirt to provide ballast. End hems are heat sealed around a rope and grommeted to allow attachment to each other with rope or bolts/nuts/washers. All .DOT barriers are construction of tough 18 oz. vinyl polyester fabric (22 oz. optional).
The most frequently specified barrier in the line. It is recommended for construction sites located in protected areas that are exposed only to light winds and to current velocities of less than one foot per second. This type of site may include ponds, shallow lakes, small streams and marshes.
Anchorage consisting of stakes or concrete blocks may be required to maintain the barrier in its required position. Barrier sections are connected by rope lacing or nylon ties which must be furnished by others.
Type II is the work horse of the line. It has a top load cable and special stress plates for reinforcing the corners and is designed to handle more severe conditions. It is recommended for lakes, streams, intercoastal and tidal areas where current velocities up to five feet per second are expected.
The anchorage and installation must be designed to meet the site conditions. Contact Aer-Flo Canvas Products, Inc. or a qualified engineer for assistance when extraordinary site conditions are encountered. Barrier sections are connected by rope lacing or nylon ties which must be furnished by others.
Type III is a special adaption of the Type II barrier. Approximately 20% of the area of the barrier skirt fabric is replaced with a polypropylene filter fabric conforming to some State DOT specifications. The filter fabric is inserted to reduce the pressure on the curtain while retaining silt. In actual practice, a filter fabric which is woven tightly enough to retain silt will not significantly reduce pressure on the curtain. Conversely, if the filter fabric is woven loose enough to reduce the pressure on the curtain, it will not be able to retain most silt and sediment particles. In addition, the filter fabric cannot be heatsealed, and must be sewn into the curtain, resulting in a reduction in curtain strength and longevity.
|*||*||*||16 oz. nominal laminated vinyl-polyester fabric|
|*||*||*||18 oz. laminated vinyl-polyester fabric (note 4)|
|*||*||22 oz. vinyl coated polyester fabric (see Selection Guide below)|
|*||*||polypropylene woven filter fabric (note 6)|
|*||*||*||*||*||*||heat sealed seams (note 1)|
|*||*||*||*||*||5/8 inch polypropylene twisted rope edge reinforcement|
|*||*||6" x 6" x 48" EPS foam blocks providing 11 lbs / ft buoyancy (note 5)|
|*||*||*||8" x 8" x 48" EPS foam blocks providing 18 lbs / ft buoyancy (note 5)|
|*||*||*||*||*||See Detail||standard depth = 5 feet (note 2)|
|*||*||*||standard length = 50 feet (note 3)|
|*||*||*||standard length = 100 feet (note 3)|
|*||*||*||*||*||#4 brass grommets approximately 12" o.c. in edges for laced connection|
|*||*||aluminum stress plates at top and bottom corners|
|*||*||*||5/16 inch galvanized street proof coil ballast chain - 95 lbs / 100 ft|
|*||*||*||5/16 inch 7 x 19 vinyl coated galvanized steel topload cable 9800 lb|
|*||*||*||breaking strength - 1960 lb allowable working load|
|*||*||*||galvanized steel safety snap top connection|
- The filter fabric in Type 3.DOT barriers cannot be heat sealed. It must be sewn.
- Any special depth of barrier will be supplied to order. Call for pricing.
- Any special length of barrier will be supplied to order. Call for pricing.
- Heavy weight fabrics will be supplied to order. Call for pricing.
- Buoyancy is increased on special depths. See the Selection Guide below.
- The entire skirt of both Types 1.DOT and 2.DOT barriers can be fabricated using filter fabric in lieu of vinyl.
|CHARACTERISTIC TEST METHOD
||16 OZ NOMINAL LAMINATED
||18 OZ LAMINATED
||22 OZ COATED
||VINYL LAMINATE ON 1000 DENIER 9 X 9 SCRIM
||VINYL LAMINATE ON 1300 DENIER 9 X 9 SCRIM
||VINYL COATED ON WOVEN 6 OZ POLYESTER BASE
|NOMINAL 16 OZ / SQ YD 376 GR / SQ M
||18 OZ / SQ YD
423 GR / SQ M
|22 OZ / SQ YD
517 GR / SQ M
|7.5 OZ / SQ YD|
176 GR / SQ M
ASTM D-751-95 SEC 43.1.2
|15 LB / IN
14 daN / 5 cm
|15 LB / IN
14 daN / 5 cm
|14 LB / IN
13 daN / 5 cm
|250 x 225 LB / IN
238 x 214 daN / 5 cm
|397 x 373 LB / IN
378 x 363 daN / 5 cm
|500 x 400 LB / IN
476 x 389 daN / 5 cm
|350 x 250 LB / IN|
333 x 230 daN / 5 cm
|70 x 55 LB / IN
67 x 52 daN / 5 cm
|96 x 86 LB / IN
91 x 82 daN / 5 cm
|132 x 143 LB / IN
126 x 136 daN / 5 cm
|95 x 55 LB / IN|
90 x 52 daN / 5 cm
ASTM D-751-95 SEC 34.2