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
TWOB, TBOB & TWOBHV Series Hose (Stainless Steel Braid)
Unit of Measure
Items TWOB, TBOB & TWOBHV Series Hose (Stainless Steel Braid)
8TWOB
TWOB, TBOB & TWOBHV Series Hose (Stainless Steel Braid) 		TWOB, TBOB & TWOBHV Series Hose (Stainless Steel Braid) (8TBOB)
8TBOB
TWOB, TBOB & TWOBHV Series Hose (Stainless Steel Braid) 		TWOB, TBOB & TWOBHV Series Hose (Stainless Steel Braid)
12TWOB
TWOB, TBOB & TWOBHV Series Hose (Stainless Steel Braid) 		TWOB, TBOB & TWOBHV Series Hose (Stainless Steel Braid) (8TBOB)
12TBOB
TWOB, TBOB & TWOBHV Series Hose (Stainless Steel Braid) 		TWOB, TBOB & TWOBHV Series Hose (Stainless Steel Braid)
16TWOB
TWOB, TBOB & TWOBHV Series Hose (Stainless Steel Braid)
Inside Diameter N/A 1/2 in12.7 mm N/A 1/2 in12.7 mm N/A 0.75 in19.1 mm N/A 0.75 in19.1 mm N/A 1.0 in25.4 mm
Outside Diameter N/A 3/4 in19.1 mm N/A 3/4 in19.1 mm N/A 1-1/8 in28.6 mm N/A 1-1/8 in28.6 mm N/A 1-1/4 in31.8 mm
Max. Length N/A 100 ft N/A 100 ft N/A 70 ft N/A 70 ft N/A 65 ft
Max. Working Pressure1 N/A 500 psi3.45 MPa N/A 500 psi3.45 MPa N/A 425 psi2.93 MPa N/A 425 psi2.93 MPa N/A 350 psi2.41 MPa
Min. Burst Pressure2 N/A 2000 psi13.79 MPa N/A 2000 psi13.79 MPa N/A 1700 psi11.72 MPa N/A 1700 psi11.72 MPa N/A 1400 psi9.65 MPa
Min. Bend Radius N/A 2.00 in50.80 mm N/A 2.00 in50.80 mm N/A 2.75 in69.85 mm N/A 2.75 in69.85 mm N/A 4.00 in101.60 mm
Vacuum Hg (@ 70ºF)3 N/A 29.9 in75.95 mm
Inner Tube N/A Chemfluor® White N/A Chemfluor® Black N/A Chemfluor® White N/A Chemfluor® Black N/A Chemfluor® White
Weight N/A 0.20 lbs/ft0.30 kg/m N/A 0.20 lbs/ft0.30 kg/m N/A 0.30 lbs/ft0.45 kg/m N/A 0.30 lbs/ft0.45 kg/m N/A 0.40 lbs/ft0.60 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
  • Product transfer
  • Caustic solutions
 		N/A
  • Base chemicals
  • Corn syrup
  • Hexane
  • Product transfer
  • Caustic solutions
 		N/A
  • Base chemicals
  • Corn syrup
  • Product transfer
  • Caustic solutions
 		N/A
  • Base chemicals
  • Corn syrup
  • Hexane
  • Product transfer
  • Caustic solutions
 		N/A
  • Base chemicals
  • Corn syrup
  • Product transfer
  • Caustic solutions
Details N/A Construction: Inner Tube:
    -Chemfluor® white PTFE
  • 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.
 		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.
 		N/A Construction: Inner Tube:
    -Chemfluor® white PTFE
  • 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.
 		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.
 		N/A Construction: Inner Tube:
    -Chemfluor® white PTFE
  • 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.