Dual Pipe
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 RD Logics 61515XB Blue Twin Exhaust DOUBLE DUAL PIPE T MAXX 25 33 $65.99 Time Remaining: 23d 20h 22m Buy It Now for only: $65.99 |
 RDLogics 62750XP Twin Exhaust Pipe Dual Stingers For Mgt Polished $59.99 Time Remaining: 5d 14h 46m |
 RD Logics 61515XP DOUBLE DUAL PIPE POLISHED T MAXX 25 $57.87 Time Remaining: 19d 12h 20m Buy It Now for only: $57.87 |
 RDLogics 61730XB DOUBLE DUAL PIPE BLUE SAVAGE 25 X $56.87 Time Remaining: 26d 15h 31m Buy It Now for only: $56.87 |
 RDLogics 61515XB Double Dual Quad Stinger Tuned Pipe Blue T Maxx 25 33 New $57.87 Time Remaining: 26d 20h 13m Buy It Now for only: $57.87 |
 Traxxas 33 T Maxx Resonator Dual Chamber Pipe $49.99 Time Remaining: 29d 15h 23m Buy It Now for only: $49.99 |
 RD Logics 61515XP Twin Exhaust DOUBLE DUAL PIPE T MAXX 25 33 Polished New $65.99 Time Remaining: 18d 19h 12m Buy It Now for only: $65.99 |
 Traxxas 5485 Tuned Pipe Dual Chamber ROAR Jato $45.10 Time Remaining: 10d 23h Buy It Now for only: $45.10 |
 RD Logics 61515XT Twin Exhaust DOUBLE DUAL PIPE T MAXX 25 33 Titanium New $62.59 Time Remaining: 8d 18h 37m Buy It Now for only: $62.59 |
 RDLogics 61520XP DOUBLE DUAL PIPE POLISHED SLAYER NEW $56.87 Time Remaining: 20d 12h 15m Buy It Now for only: $56.87 |
 RD Logics 61730XB Double Dual Pipe Blue Savage 25 X $56.87 Time Remaining: 26d 15h 31m Buy It Now for only: $56.87 |
 RDLogics 61515XP DOUBLE DUAL PIPE POLISHED T MAXX 25 $57.87 Time Remaining: 5d 14h 24m Buy It Now for only: $57.87 |
 Rd Logics Twin Exhaust Pipe w Dual Stingers Polished LST 2 RDL62950XP $75.75 Time Remaining: 23d 14h 6m Buy It Now for only: $75.75 |
 Traxxas 5485 Resonator Pipe Dual Chamber Jato 25 33 $34.79 Time Remaining: 13d 21h 47m Buy It Now for only: $34.79 |
 RD Logics 61520XP DOUBLE DUAL PIPE POLISHED REVO 25 $56.87 Time Remaining: 23d 17h 55m Buy It Now for only: $56.87 |
 RD Logics 62750X P Polished Twin Exhaust Pipe With Dual Stingers Monster GT MGT $64.59 Time Remaining: 11d 22h 53m Buy It Now for only: $64.59 |
 FAST SHIP HPI Savage X aluminum dual exhaust pipe SAV130807R $48.48 Time Remaining: 17d 3h 59m Buy It Now for only: $48.48 |
 Rd Logics Twin Exhaust Pipe w Dual Stingers Blue Savage RDL61730XB $71.55 Time Remaining: 13d 13h 32m Buy It Now for only: $71.55 |
 RD Logics 61730XP Polished Twin Exhaust Pipe With Dual Stingers Savage $64.59 Time Remaining: 7d 17h 22m Buy It Now for only: $64.59 |
 Traxxas 5485 Resonator Pipe Dual Chamber Nitro Sport $34.79 Time Remaining: 13d 21h 47m Buy It Now for only: $34.79 |
 HPI Savage 25 SS 46 aluminum dual exhaust pipe SAV130807R $54.95 Time Remaining: 20h 36m Buy It Now for only: $54.95 |
 Rd Logics Twin Exhaust Pipe Dual StingerTitanTMaxx 25 33 RDL61515XT $71.55 Time Remaining: 27d 12h 20m Buy It Now for only: $71.55 |
 HPI Savage X aluminum dual exhaust pipe SAV130807R $54.95 Time Remaining: 20h 36m Buy It Now for only: $54.95 |
 Alu Tuned Dual Exhaust Pipe Fits HPI Savage 21 25 SS X $46.99 Time Remaining: 27d 10h 1m Buy It Now for only: $46.99 |
 RD Logics Twin Exhaust Pipe w Dual Stingers Polished LST 2 $62.99 Time Remaining: 14d 13h 49m Buy It Now for only: $62.99 |
 Rd Logics Twin Exhaust Pipe Dual Stingers P RDL61730XP $59.50 Time Remaining: 8d 17h 25m Buy It Now for only: $59.50 |
 OFNA 31992 Dual Chamber Tuned Pipe 95 RTR Pro $27.26 Time Remaining: 24d 4h 9m Buy It Now for only: $27.26 |
 FAST SHIP HPI Savage 25 SS 46 aluminum dual exhaust pipe SAV130807R $48.48 Time Remaining: 17d 3h 58m Buy It Now for only: $48.48 |
 Arrow Shark 2012 2 Band WTC Steel Tuned Pipe Dual Functions Flange $128.00 Time Remaining: 26d 23h 20m Buy It Now for only: $128.00 |
 Dual Chamber Pipe Polished M 01P RC WillPower 1 8th HongNor JAMMIN OFNA LRP $35.28 Time Remaining: 26d 2h 38m Buy It Now for only: $35.28 |
 RD Logics 61515XB Double Dual Quad Stinger Tuned Pipe Blue T Maxx 25 33 New $57.87 Time Remaining: 26d 20h 13m Buy It Now for only: $57.87 |
 Rd Logics Twin Exhaust Pipe Dual Stingers Polished SavageX RDL61730XP $71.55 Time Remaining: 22d 13h 57m Buy It Now for only: $71.55 |
 RD Logics Twin Exh Pipe Dual StingersBlueRevo 25 33SLY $80.00 Time Remaining: 14d 13h 49m Buy It Now for only: $80.00 |
 Traxxas Resonator Dual Chamber Tuned Pipe T Maxx tmaxx more power exhaust $21.99 Time Remaining: 6d 22h 54m Buy It Now for only: $24.99 |
 RD Logics 62900T Dual Stinger Pipe Titanium LST LST2 $54.87 Time Remaining: 7d 57m Buy It Now for only: $54.87 |
 RD Logics Twin Exhaust Pipe Dual Stingers Polished Savage X RDL61730XP $69.99 Time Remaining: 11d 22h 31m Buy It Now for only: $69.99 |
 Traxxas Revo Aluminum Tuned Dual Chamber Pipe $24.95 Time Remaining: 4d 2h 16m Buy It Now for only: $24.95 |
 Rd Logics Twin Exhaust Pipe w Dual Stingers Purple Savage RDL61730XPP $79.85 Time Remaining: 23d 12h 50m Buy It Now for only: $79.85 |
 Rd Logics Twin Exhaust Pipe w Dual Stinger Blue Tmaxx25 33 RDL61515XB $71.55 Time Remaining: 17d 13h 57m Buy It Now for only: $71.55 |
 Rd Logics Twin Exh Pipe Dual StingersTitanRevo 25 33SLY RDL61520XT $71.55 Time Remaining: 20d 14h 2m Buy It Now for only: $71.55 |
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 Rd Logics Twin Exh Pipe Dual StingersBlueRevo 25 33SLY RDL61520XB $71.55 Time Remaining: 14d 14h 25m Buy It Now for only: $71.55 |
 RDLogics 62900P DUAL stinger TUNED PIPE POLISHED LST2 $52.87 Time Remaining: 1d 21h 12m Buy It Now for only: $52.87 |
 Traxxas 5485 Resonator Pipe Dual Chamber Nitro Rustler $34.79 Time Remaining: 13d 21h 47m Buy It Now for only: $34.79 |
 RDLogics 62900P DUAL STINGER PIPE POLISHED AFTERSHOCK $52.87 Time Remaining: 1d 21h 2m Buy It Now for only: $52.87 |
 T Maxx 33 Polished Resonator Dual Chamber Tuned Pipe $34.99 Time Remaining: 16d 13h 15m Buy It Now for only: $34.99 |
 Traxxas 5485 Resonator Pipe Dual Chamber 4 Tec 33 $34.79 Time Remaining: 13d 21h 47m Buy It Now for only: $34.79 |
 Arrow Shark Dual Exhaust Muffler Pipe Combo $138.00 Time Remaining: 23d 1h 15m Buy It Now for only: $138.00 |
 RD Logics 62900P DUAL stinger PIPE POLISHED AFTERSHOCK $52.87 Time Remaining: 1d 21h 10m Buy It Now for only: $52.87 |
 CVEC RS120BL Dual Chamber Torque 1 10 Power Pipe 12 Car Truck ROAR NIP Kit Blue $31.49 Time Remaining: 15d 17h 51m Buy It Now for only: $31.49 |
 RD Logics 62900P DUAL stinger TUNED PIPE POLISHED LST2 $52.87 Time Remaining: 1d 21h 13m Buy It Now for only: $52.87 |
 Rd Logics Twin Exhaust Pipe w Duals Polished Tmaxx 25 OS18 RDL61515XOSP $71.55 Time Remaining: 29d 12h 30m Buy It Now for only: $71.55 |
 Rd Logics Twin Exhaust Pipe Dual Stingers Polished MGT RDL62750XP $84.05 Time Remaining: 22d 13h 57m Buy It Now for only: $84.05 |
 CVEC RS120S Dual Chamber 1 10 12 Pipe ROAR NIP Kit $31.49 Time Remaining: 15d 18h 34m Buy It Now for only: $31.49 |
 RD Logics Twin Exhaust Pipe w Dual Stinger Blue Tmaxx25 33 $80.00 Time Remaining: 14d 13h 50m Buy It Now for only: $80.00 |
 Traxxas Revo Dual Chamber Tuned Pipe Blue Aluminum 5342 $33.47 Time Remaining: 28d 2h 24m Buy It Now for only: $33.47 |
 RD Logics Twin Exhaust Pipe w Dual Stingers Blue Savage $80.00 Time Remaining: 21d 19h 3m Buy It Now for only: $80.00 |
 RD Logics Twin Exh Pipe Dual StingersPolishedTmaxx25 33 $80.00 Time Remaining: 14d 13h 50m Buy It Now for only: $80.00 |
 RD Logics Twin Exh Pipe Dual Stingers PolRevo 25 33 SLY $80.00 Time Remaining: 14d 13h 49m Buy It Now for only: $80.00 |
 RD Logics Twin Exhaust Pipe Dual StingerTitanTMaxx 25 33 $80.00 Time Remaining: 14d 13h 50m Buy It Now for only: $80.00 |
 RD Logics Twin Exhaust Pipe Dual Stingers Polished SavageX $80.00 Time Remaining: 14d 13h 49m Buy It Now for only: $80.00 |
 RD Logics Twin Exhaust Pipe w Duals Polished Tmaxx 25 OS18 $80.00 Time Remaining: 14d 13h 50m Buy It Now for only: $80.00 |
 TRAXXAS TRA5485 DUAL ROAR ALUM TUNED PIPE JATO $44.99 Time Remaining: 11d 5h 48m Buy It Now for only: $44.99 |
 TRAXXAS TRA5487 RESONATOR PIPE DUAL CHAMBER TMX33 $55.99 Time Remaining: 11d 20h 30m Buy It Now for only: $55.99 |
Dual Pipe
Pipe Makers Extruded New Market
By 1989, fences were 25% of Bufftech’s sales, and by 1991, Bufftech was out of pipe altogether. Kroy Building Products in York, Neb., was also exclusively a pipe maker until 1990, when it started making PVC fences. By ’96, Kroy had split its pipe and fence making into two companies, of which fencing was much larger.
Nebraska Plastics Inc. in Cozad, Neb., is considered to have made the first PVC fencing in 1976. “That fence such as temporary fence,portable fence,wire mesh fence still stands on a farm east of Cozad, Neb.,” notes company president Rex German. Other small PVC pipe makers began to follow suit in the early to mid-’80s, like Triple Crown Fence (now part of Royal Group) in Milford, Ind., and Bufftech (now part of Certainteed) in Buffalo, N.Y. They were drawn by the double-digit profit margins in fencing, as compared with less than 1% margins in pipe.
Makers of window and siding profiles also got into fences as a profitable way to reuse scrap that they could less readily put back into windows and siding. Lumber and building-products companies have also gotten into PVC fences. An example is lumber maker Irwin Industries in Peachtree City, Ga., which began making PVC fence profiles five years ago. “Now other profile companies are looking at fences as an additional product line,” says Tom Brown, sales manager at ExtrusionTek Milacron in Batavia, Ohio.
Pipe and siding companies initially approached fence manufacturing quite differently. Pipe makers extruded monolayer products very fast, often with dual-strand dies, and without worrying much about surface cosmetics. They applied high-output pipe cooling techniques such as vacuum sizing, flooded cooling, and high-intensity spray. On the other hand, window-profile makers were used to extruding far more slowly than pipe, with close attention to cosmetics and dimensional tolerances. They used dual-strand lines primarily on smaller profiles, and they typically relied on dry-sizing calibrators. In addition, window-profile makers put uv-resistant cap layers on exposed surfaces of their fence products to reduce their overall use of stabilizers and titanium dioxide.
Now the two approaches are meeting somewhere in the middle: Profile makers are speeding up their fencing lines with use of high-speed pipe cooling and dual-strand lines of all sizes. Coextrusion of uv cap layers is also growing in popularity.
However, there are dissenters. Royal Crown and Nebraska Plastics, for example, are committed to monolayer extrusion, believing it makes a superior fence product. Nebraska Plastics’ German warned about coextrusion at the fence convention in Fla. this year: “Unfortunately, many producers have begun using PVC fence as a dumping ground for inferior materials. While coextrusion itself isn’t the culprit, it gives opportunistic producers the chance to mask inappropriate materials with a capstock.”
“The latest change in the fence business is getting higher capacity machines and running them faster, without the dimensional constraints of window profiles,” says Lawrence of Outdoor Advantage. His firm runs conical twin at over 1200 lb/hr, thanks in part to a very long, 14-ft puller.
As an example of how fast things are changing, just a year ago, standard cooling tanks for PVC fencing pumped 60-100 gal/min of water from 100-150 nozzles, or else used turbulent immersion cooling. But in the past year Conair has delivered several high-intensity spray-cooling tanks for fences that deliver 200-340 gal/min through up to 370 spray nozzles in a 24-ft tank.
“Evaporative cooling, used properly in the initial stage of cooling, can increase cooling 20-30% over immersion,” says Conair product manager Robert Bessemer. Such intensive cooling—combined with a system for air/water separation, vacuum, and water recirculation—has been used on high-output pipe lines for 15 years but is relatively new to fences, he says.
Cooling lines are also getting longer to keep up with higher production rates. Calibrators have gone from 24 to 48 in. long, and flood tanks from 20 to 30 ft, plus in some cases another 10 ft of spray tank. Recently installed fence lines typically use 40 ft of cooling. “In the past year, we’ve probably raised our output 50% by improving the streamlining in dies and adding to the length of dry calibration and wet cooling tanks,” says Kansas American’s Doering.
For extruding fences at 1200-2000 lb/hr, ExtrusionTek Milacron recommends its 80- or 92-mm conical twin-screw for the substrate and a 55-mm conical twin for the cap layer. A standard 1.5 x 5.5 in. fence plank typically runs at up to 16 ft/min, whereas a high-output parallel twin-screw reportedly can push speeds to 30 ft/min while running dual strands.
Davis-Standard expanded its Gemini series of parallel twin-screws last year with a larger 140-mm model that puts out up to 2800 lb/hr of pipe. But so far the biggest Gemini extruder used in fencing is the 114-mm, good for 1600 lb/hr.
About the Author
David ZHENG is the CEO of http://www.temporary-fence.com.au .A company specialized in selling all kinds of fence products such as temporary fence,portable fence,wire mesh fence etc.
Will running true dual pipes with no mufflers lose back pressure?
I have a 2001 f150 and want to run true dual pipes. I am still going to keep the catalytic converters on it. But i was wondering if you will lose a lot of back pressure like this.
straght pipies w cats ? wats w/ the exaust you have now ? straight pipes are just that UN CORKED LOUD MADNESS you wont hear your valve trian floating
Raptor 250 (DMC dual pipes)
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