Dunham Rubber & Belting Corporation
Dunham Rubber & Belting Corporation
682 Commerce Parkway West Drive, Greenwood, IN 46143
Toll Free: 800.876.5340
Tel: 317.888.3002
Fax: 317.888.2335
Email: mail@dunhamrubber.com
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Chemfluor® PTFE Fluoropolymer Helically Convoluted Inner Tube
Stainless Steel Braid
Open Pitch

TWOBHV/TBOBHV Series
  • Fully rated vacuum hose
  • Recommended for full vacuum applications
  • Should always be used for 2-1/2", 3" and 4" I.D. assemblies
Features and Benefits

Chemfluor® PTFE inner tube
  • Excellent chemical resistance
  • Compatible with almost all materials
  • Rounded, open-pitch helical convolutions shaped to ensure smooth product flown on-stick surface, easy to clean (steam, caustics, solvents or other cleaning agents)
  • Assured sterility
  • Easy to flex, yet won't flatten when bent
Chemfluor® black PTFE electrostatic dissipating conductive inner tube

  • Co-extrusion design with minute amount of carbon added to inner portion of thick-wall construction
  • Processed to prevent chemical leaching or friction contamination
  • Chemfluor® PTFE properties are completely maintained
Note:
Extended Service Life Tip: Flexible Components suggests using full-length anti-kink armor casing or at least 16" to 24" long anti-kink cuffs at each fitting end to help reduce the strain on the crimp collar and fittings in high load installations. Prolonged service at elevated temperatures will reduce total service life.
Unit of Measure

Specifications

Inside Diameter

 N/A 1.25 in31.8 mm

Outside Diameter

 N/A 1-5/8 in41.3 mm

Max. Length

 N/A 45 ft
Max. Working Pressure1 N/A 337 psi2.32 MPa
Min. Burst Pressure2 N/A 1350 psi9.31 MPa

Min. Bend Radius

 N/A 5.50 in139.70 mm
Vacuum Hg (@ 70ºF)3 N/A 29.9 in75.95 mm

Inner Tube

 N/A Chemfluor® Black

Weight

 N/A 0.70 lbs/ft1.04 kg/m

Applications

N/A

  • Sanitary transfer
  • Food, flavors and syrups
  • Solvent transfer
  • Drain and sample lines

Common Media

N/A

  • Base chemicals
  • Corn syrup
  • Hexane
  • Product transfer
  • Caustic solutions

Details

N/A Construction: Inner Tube:

    -Chemfluor® black PTFE electrostatic dissipating conductive
  • Reinforcement: 316 stainless steel braid
    -Other braid options available
    -Polypropylene - TWOY/TBOY
    -PVDF (Kynar®) - TWOK/TBOK
Fittings:
  • PermaSeal® crimp-style
    -Over 40 styles
  • Flare-Thru fitting technology available:
    -150# lap-joint style flanged
    -Female cam and groove
    -Sanitary clamp style
    -1/2" mini sanitary Flare-Thru available using 3/8" ID open pitch hose
  • See Fitting Details: Flare-Thru Fittings: PermaSeal® Fittings: Adapter Fittings
Important:
  • Hose assemblies may be autoclaved; however, flare faces of Flare-Thru fittings must be clamped down to prevent damage to sealing surface.

Engineering Specifications

N/A Temperature Rating

  • -100ºF to +450ºF
  • -73ºC to +232ºC

Pressure Rating

N/A Burst Pressure ratings at ambient 70°F (21°C). See below on vacuum/pressure ratings at temperatures other than ambient.
Working Pressure is given @ 70°F,; decrease working pressure 1% for every 2°F above 250°F.
Vacuum Rating is given @ 70°F @ 2X minimum bend radius; decrease vacuum rating 1% for every 2°F above 250°F. Vacuum rating decreases when installed @ less than 2X minimum bend radius. TWOBHV/TBOBHV Series (heavy duty vacuum option) allows full vacuum ratings for 1-1/2", 2" and 2-1/2" sizes up to 350°F decrease vacuum rating 1% for every 2°F above 350°F. Vacuum rating @ less than 2X minimum bend radius: 1-1/4" = 26" Hg; 1-1/2" = 25" Hg; 2" = 20" Hg; 2-1/2" = 17" Hg; 3" = 20" Hg; 4" = 17" Hg.
Extended Service Life Tip: Flexible Components suggests using full-length anti-kink armor casing or at least 16" to 24" long anti-kink cuffs (Hose Cover Options) at each fitting end to help reduce the strain on the crimp collar and fittings in high load installations. Prolonged service at elevated temperatures will reduce total service life.

  • 1 Working Pressure is given @ 70°F,; decrease working pressure 1% for every 2°F above 250°F.
  • 2 Burst pressure ratings at ambient 70°F (21°C). See below on vacuum/pressure ratings at temperatures other than ambient.
  • 3 Vacuum Rating is given @ 70°F @ 2X minimum bend radius; decrease vacuum rating 1% for every 2°F above 250°F. Vacuum rating decreases when installed @ less than 2X minimum bend radius. TWOBHV/TBOBHV Series (heavy duty vacuum option) allows full vacuum ratings for 1-1/2", 2" and 2-1/2" sizes up to 350°F decrease vacuum rating 1% for every 2°F above 350°F. Vacuum rating @ less than 2X minimum bend radius: 1-1/4" = 26" Hg; 1-1/2" = 25" Hg; 2" = 20" Hg; 2-1/2" = 17" Hg; 3" = 20" Hg; 4" = 17" Hg.