Essential  Steps  in  Selecting  the  Correct  Hose  End  Fi5ing

q  This webinar will be available afterwards at designworldonline.com & email

q  Q&A at the end of the presentation q  Hashtag for this webinar: #DWwebinar

Before We Start

Moderator

Miles Bidimir Design World

Presenter

Tim Deans Gates Corporation

Essential Steps in Selecting the Correct Hose End Fitting Presented by Gates Corporation

Ø  Hose failures

Ø  Leaks

Ø  Increase in warranty claims & call-backs

Ø  Worker safety

Risks of Not Using Correct Couplings

Ø  Materials

Ø  Attachments

Ø  Construction

Ø  Size & Thread

8 Critical Considerations in Selecting Safe & Effective Couplings

Ø  Coupling compatibility

Ø  Ease of handling

Ø  Quality

Ø  Exposure

Ø  Four types: Ø  Carbon Steel/Alloy Ø  Brass Ø  Aluminum Ø  Stainless Steel

Ø  Select material that is compatible with the hose material and with what it will be exposed to

Materials

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

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

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

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

Attachments

Ø  Options include ferrules or band/clamp attachments Ø  Ferrules

Ø  For most hoses over 150 PSI or for various media Ø  Available in metal or brass

Ø  Band or clamp attachments Ø  For low pressure applications such as material transfer

Ø  More information Ø  See: http://www3.catalogds.com/ecrimp/ or hose and

coupling manufacturer information published in catalog and crimp data database

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  Spiral is for high impulse and high pressure applications Ø  Wire braid is for high pressure, moderate impulse applications Ø  Textile reinforced is for moderate impulse, fairly high pressure,

and lightweight or non-conductive needs Ø  Helical is for suction applications to prevent hose collapse

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

Size & Terminations

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

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

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.?

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  

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

Questions?

Ø  More Questions?

Ø  Contact Gates Engineering & Training Support Ø  303-744-5070 Ø  TD1403@gates.com

Ø  Click here for more tools and resources

Questions?

Design World Leslie Langnau llangnau@wtwhmedia.com Phone: 440.234.4531 Twitter: @DW_RapidMfg

Gates Corporation Tim Deans TDeans@gates.com Phone: Twitter:

Thank You q  This webinar will be available at designworldonline.com & email

q  Tweet with hashtag #DWwebinar

q  Connect with

q  Discuss this on EngineeringExchange.com