Essential Steps in Selecting the Correct Hose End Fitting


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Extensive information is available regarding polymers utilized in industrial hoses. However, appropriate selection methodologies for choosing the safest and most effective couplings are rarely discussed. Hose leaks, failures and worker safety issues can be avoided by understanding how to select the best coupling for your hose assembly.
Watch this webinar to learn:
• How materials and application impact coupling selection
• The importance of choosing the appropriate attachments, coupling construction, size and thread
• Considerations in regards to ease of handling, quality and more

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Essential Steps in Selecting the Correct Hose End Fitting

  1. 1. Essential  Steps  in  Selecting  the  Correct   Hose  End  Fi5ing
  2. 2. Before We Start q  This webinar will be available afterwards at & email q  Q&A at the end of the presentation q  Hashtag for this webinar: #DWwebinar
  3. 3. Moderator Presenter Miles Bidimir Tim Deans Design World Gates Corporation
  4. 4. Essential Steps in Selecting the Correct Hose End Fitting Presented by Gates Corporation
  5. 5. Risks of Not Using Correct Couplings Ø  Hose failures Ø  Leaks Ø  Increase in warranty claims & call-backs Ø  Worker safety
  6. 6. 8 Critical Considerations in Selecting Safe & Effective Couplings Ø  Materials Ø  Coupling compatibility Ø  Attachments Ø  Ease of handling Ø  Construction Ø  Quality Ø  Size & Thread Ø  Exposure
  7. 7. Materials Ø  Four types: Ø  Ø  Ø  Ø  Ø  Carbon Steel/Alloy Brass Aluminum Stainless Steel Select material that is compatible with the hose material and with what it will be exposed to
  8. 8. Carbon & Alloy Steel Couplings Ø  Applicable in low to high pressure environments Ø  Different types of carbon steel are suitable for different applications Ø  Carbon steel can be customized for specific applications Ø  Carbon content determines the ultimate strength, toughness, ductility, machinability, weldability, and corrosion resistance Ø  A great option when rust is a concern Ø  More commonly available, utilizes standard tooling, relatively inexpensive
  9. 9. Brass Couplings Ø  Applicable in low pressure environments and some (not all) fuel lines Ø  Allows for banding or clamping with no metal to metal contact Ø  Important not to attach by crimping as the metal is too soft Ø  Moderate prices
  10. 10. Aluminum Couplings Ø  Used in marine, agriculture, and mobile technologies Ø  Weighs less than brass or steel, great for reducing weight in assemblies Ø  Good corrosion resistance, ductility, and strength Ø  Moderate prices
  11. 11. Stainless Steel Couplings Ø  Good for corrosive environments such as salt water and maritime applications Ø  Applicable in low to extremely high pressure environments Ø  Many grades of stainless steel are available but major coupling manufacturers use 316 Ø  Can be significantly more expensive than standard carbon steel so should only be used when situation dictates
  12. 12. Attachments Ø  Options include ferrules or band/clamp attachments Ø  Ferrules Ø  Ø  Ø  Band or clamp attachments Ø  Ø  For most hoses over 150 PSI or for various media Available in metal or brass For low pressure applications such as material transfer More information Ø  See: or hose and coupling manufacturer information published in catalog and crimp data database
  13. 13. Construction Ø  Must be compatible with fluid going through the hose Ø  Coupling stem must be compatible with the hose Ø  If the serrations or bead on the stem are not correct, they damage the hose and leak, or the coupling will come off Ø  Options include spiral, wire braid, textile, or helical reinforced construction Ø  Ø  Ø  Ø  Spiral is for high impulse and high pressure applications Wire braid is for high pressure, moderate impulse applications Textile reinforced is for moderate impulse, fairly high pressure, and lightweight or non-conductive needs Helical is for suction applications to prevent hose collapse
  14. 14. Size & Terminations Ø  Size is determined by the volume of fluid that will move through Ø  If not sized correctly, the fluid will either increase in velocity or slow down and not transfer quickly enough Ø  Termination will be determined by the components the hose connects to Ø  Determine best coupling size utilizing a Pressure Drop Calculator or Gates hydraulic hose and coupling catalog on page 64 Ø  Appropriate thread is dictated by SAE or ISO standards Ø  Find hose and coupling descriptions, pressure ratings, thread configurations, and additional information in SAE J516, 517, 518, and J343 cover tests
  15. 15. Coupling Compatibility Ø  Compatibility is determined by the manufacturer Ø  Coupling has to be compatible with the hose, the fluid going through the hose, and the external environment Ø  Termination (sealing design) must match component and pressure rating Ø  Must consider fluid or media going through the hose Ø  Coupling/hose including sealing surface MUST meet pressure and velocity requirements Ø  External or ambient conditions that may corrode prematurely should be considered
  16. 16. Quality Ø  Cheap couplings may have poor plating that will rust, or they may not be consistently compatible with the hose they are attached to and come off Ø  Good quality fittings can be counted on to work every time without worry Ø  Quality will vary dramatically between manufacturers Ø  Some products barely meet SAE minimums; others go 3X SAE standards Ø  Design specifications are published in catalogs or on the hose layline
  17. 17. Ease of Handling Ø  If attaching and detaching the coupling frequently, use camlock or other easy-to-use couplings Ø  A threaded or bolt on connection is recommended if the connection is to remain attached for longer periods of time Ø  Questions to ask in ease of handling include: Ø  What are you putting through the hose? Ø  What volume do you need to flow? (Volume and pressure determine velocity.) Ø  What pressure is needed? (Different couplings may be easy to hook up, but won’t handle pressure or fluids.) Ø  What type of port are you connecting to? Ø  What type of connection will be best and easiest – bolt on clamps that can be done in the field, flange, hammer union/API, camlock, etc.?
  18. 18. Considerations in Ease of Handling Force  to  bend   Bend  radius   Weight,  abrasion  resistance   Cover  fric7on  coefficient   Crimp  (skive,  or  no  skive)   Diameter   Hybrid  hoses  for  mul7ple  hoses   Weight   Flexibility  
  19. 19. Exposure Ø  Must consider internal and external exposure Ø  Considerations in exposure include: Ø  Human exposure Ø  External exposure Ø  Hazardous exposure Ø  Any environmental and fluid interactions Ø  Temperature & pressure Ø  Impulse frequency Ø  Amplitude and wave form Ø  Vibration Ø  The connection’s risk in the system Ø  Installation Ø  Reliability
  20. 20. Questions? Ø  More Questions? Ø  Contact Gates Engineering & Training Support Ø  303-744-5070 Ø Ø  Click here for more tools and resources
  21. 21. Questions? Design World Leslie Langnau Phone: 440.234.4531 Twitter: @DW_RapidMfg Gates Corporation Tim Deans Phone: Twitter:
  22. 22. Thank You q  This webinar will be available at & email q  Tweet with hashtag #DWwebinar q  Connect with q  Discuss this on