Viper

325 E. 10th St. Halstead KS. 67056

800-835-1003 Fax 316-835-3218

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VIPER CARCASS SPECS VIPER LOAD SUPPORT VIPER TROUGHABILITY

VIPER II CARCASS SPECS VIPER II LOAD SUPPORT VIPER II TROUGHABILITY

WHAT IS A STRAIGHT WARP CARCASS?

There are as many types of conveyor belting, as there are products being conveyed. Most products being conveyed, are relatively light and non abusive. Sand, gravel, grain, wood chips, each has characteristics that demand the superior quality of one of Legg Company’s multi-ply conventional weave carcass’, but then there’s the really tough stuff!! Eight inch minus rock, reclaimed scrap iron, trenching discharge, chopped up car bodies, these aren’t your basic move the pile type conveying applications!

In addition to Legg Company’s wide range of conventional multi-ply carcass, Legg Company offers the VIPER and VIPER II straight warp single and two ply carcass when you must stop that ripping and tearing that the really tuff applications cause. The straight warp and fill yarns, woven securely in place by a binder yarn, resist ripping and tearing.

Since you have to pack tremendous break strength into the one or two plies of the VIPER or VIPER II, you must use very large yarns. This large yarn size is much more resistant to ripping, tearing, and puncturing than the smaller yarns of a lighter fabric belt with 4, 5, or more plies.

In addition to the larger yarn size, the weave style of the VIPER and VIPER II gives it superior tear and puncture resistance. The forces exerted on the belt are contained in straight yarns traveling in the warp and fill directions. These yarns are bound together by a binder yarn. The binder yarn system helps distribute the impact forces of loading by allowing the warp and fill yarns to move to absorb the shock. Once the belt has been vulcanized with rubber covers and or skims, the rubber further dampens these forces and will absorb some of the stresses put on the belt by punctures which will reduce the likelihood of the belt tearing.

The graphic above shows a traditional plain weave belt carcass, and the carcass of the VIPER. In comparing the two some key differences should be noted. The yarns in the multi-ply fabric have a crimp. The crimp is the deflection of a yarn from being passed over and under other yarns. As the traditional belt carcass travels around pulleys, the crimp expands and contracts, causing friction between the two yarns which reduces belt life. The straight yarns of the Viper and Viper II do not produce this abrading effect.

Under tension the crimp will pull out of a conventional plain woven fabric causing stretch. The Viper and Viper II weave does not have crimp, thus eliminating some of the initial stretch in the belt.

The heavy fill, or cross yarns of the Viper and Viper II provide for maximum load support. This makes them a great choice for wide conveyors and or conveyors with greater distances between the center idler and troughing idlers.

The Viper and Viper II carcass has a polyester warp yarn for excellent strength with minimum stretch. Also, polyester has excellent chemical and heat resistance. Additionally the stability of the polyester makes for superior tracking with minimal belt training. The nylon fill yarns of the Viper and Viper II carcass provides for excellent mechanical fastener retention, excellent troughability, and superior rip resistance. For special applications, a special order carcass of Poly/Poly or Nylon/Nylon is available.

Carcass Specifications
VIPER
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Carcass Type	Number of Plies	Allowable Working Tension Conveyor lbs/P.I.W. Vulcanized Mechanical	Allowable Working Tension Elevator lbs/P.I.W. Vulcanized Mechanical	Carcass Gauge BB x BB inches	CONVEYOR Minimum Pulley Diameters (inches) % of A.W.T. >= 80% >=60%	ELEVATOR Minimum Pulley Diameters (inches) % of A.W.T. >= 80% >=60%	Maximum Elevator Bucket Projection (inches) Heavy (Ind) Light (grain)
V/220	1	220 190	170 150	.110	16 14	16 14	7 9
V/330	1	330 300	280 250	.125	20 18	20 18	8 9
V/440	1	440 400	375 335	.150	24 20	24 20	9 10
V/550	1	550 500	440 400	.175	26 20	26 20	10 12

RECOMMENDED LOAD SUPPORT
VIPER

	#/ft.³	#/ft.³	#/ft.³	#/ft.³	#/ft.³
Material Wt.	0-40	41-80	81-120	121-180	181-240
Maximum Belt Width In Inches	20^o 35^o 45^o	20^o 35^o 45^o	20^o 35^o 45^o	20^o 35^o 45^o	20^o 35^o 45^o
V/220	54 48 42	42 36 30	36 30 24	24 20 18	NR NR NR
V/330	72 66 60	66 54 42	60 48 42	48 42 36	30 24 18
V/440	72 72 60	72 60 48	60 54 48	54 48 42	36 30 24
V/550	72 72 66	72 66 54	66 60 54	60 54 48	42 36 30

TROUGHABILITY TABLE
VIPER
(Minimum Belt Width In Inches)

IDLERS	V/220	V/330	V/440	V/550
20^O	14"	18"	20"	24"
35^O	18"	24"	24"	30"
45^O	20"	24"	30"	36"

Carcass Specifications
VIPER II

Carcass Type	Number of Plies	Allowable Working Tension Conveyor lbs/P.I.W. Vulcanized Mechanical	Allowable Working Tension Elevator lbs/P.I.W. Vulcanized Mechanical	Carcass Gauge BB x BB inches	CONVEYOR Minimum Pulley Diameters (inches) % of A.W.T. >= 80% >=60%	ELEVATOR Minimum Pulley Diameters (inches) % of A.W.T. >= 80% >=60%	Maximum Elevator Bucket Projection (inches) Heavy (Ind) Light (grain)
VII/400	2	400 360	330 300	.275	30 24	30 24	10 12
VII/600	2	600 550	500 450	.325	30 24	30 24	12 14
VII/800	2	800 725	690 620	.375	36 30	36 30	15 16
VII/1000	2	1000 900	865 775	.430	42 36	42 36	18 20
VII/1250	2	1250 1125	1075 965	.485	48 42	48 42	20 22
VII/1500	2	1500 1350	1300 1170	.545	54 48	54 48	24 22

	#/ft.³	#/ft.³	#/ft.³	#/ft.³	#/ft.³
Material Wt.	0-40	41-80	81-120	121-180	181-240
Maximum Belt Width In Inches	20^o 35^o 45^o	20^o 35^o 45^o	20^o 35^o 45^o	20^o 35^o 45^o	20^o 35^o 45^o
VII/400	72 72 72	72 72 72	66 60 54	60 54 48	48 42 36
VII/600	72 72 72	72 72 72	72 72 72	66 60 54	60 54 48
VII/800	72 72 72	72 72 72	72 72 72	72 72 66	66 60 54
VII/1000	72 72 72	72 72 72	72 72 72	72 72 72	72 72 66
VII/1250	72 72 72	72 72 72	72 72 72	72 72 72	72 72 72
VII/1500	72 72 72	72 72 72	72 72 72	72 72 72	72 72 72

TROUGHABILITY TABLE
VIPER II
(Minimum Belt Width In Inches)

IDLERS	VII/400	VII/600	VII/800	VII/1000	VII/1250	VII/1500
20^O	24"	28"	30"	36"	42"	48"
35^O	30"	30"	36"	42"	48"	54"
45^O	36"	36"	42"	48"	54"	60"