essential steps in selecting the correct hose end fitting
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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
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q Discuss this on EngineeringExchange.com
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