8 Criteria to select proper Tube Fittings

8 Criteria to select proper Tube Fittings

Tube fittings are the basic and most essential components in any Hydraulic systems to convey the hydraulic media, i.e. oil from one location to another.

Hydraulic tube fittings are the unsung heroes of hydraulic machineries world – the ones who keep everything running smoothly, while staying humble and out of the spotlight, just like the back stage crew of a Broadway musical, making sure the show goes on without a hitch while the stars take all the credit.

Without hydraulic tube fittings or say connectors, the whole show would fall apart.

Let’s learn the criteria to select appropriate tube fittings.

Hope this little effort by hyloc will bring awareness to design/application engineers, quality inspectors, service technicians, etc. so that the systems run smoothly.

Below are some criteria for tube fittings selection.

S.No.

Design Criteria

Points to consider during tube fittings selection

1

Application

  • Industrial Hydraulics
  • Mobile Hydraulics
  • Automobiles
  • Marine Application
  • Food Processing
  • Leather / Rubber Industries
  • Steel Mills
  • Railways
  • Aerospace
  • Lubrication
  • Defence projects
  • Instrumentation
  • Pneumatics
  • High pressure and Ultra High-pressure applications
  • Oxygen System

2

Pressure

  • System Pressure (Working Pressure)
  • Peak Pressure (Pressure surges)

3

Temperature

  • Stationary
  • In Operation (During working conditions)
  • Environment

4

Media

  • Hydraulic Oil
  • Compressed Air
  • Water / Sea water
  • Any other specific fluid in use

5

Flow Rate

  • Flow Volume (lpm)

6

Space (Installation)

  • Space limitation (Any space constraints in the system)
  • Tube Bending Capabilities

7

Environment

  • Space limitation (Any space constraints in the system)
  • Tube Bending Capabilities

8

Specifications

  • International Standards
  • End-user specifications if any
  • Approval required

Below are some of the inputs for the selection of Material grades for tube fittings based on the application.

Tube fitting material

Steel

Stainless Steel

Copper / Brass

Typical Applications

  • Machine Tools
  • Mobile
  • Construction Equipment
  • Ship building
  • Off Shore
  • Coastal installations
  • Food Processing
  • Paper
  • Lubrication
  • Pneumatics
  • Cooling water

Below are some of the inputs for the selection of Material grades for tube fittings based on the application.

Seal Material

Metal to Metal

NBR

VITON

Typical Applications

  • Process Industries
  • Agricultural
  • Machine tools
  • Hydraulic presses
  • Mobile
  • Construction
  • Steel Mills
  • Casting Machines

Below are some of the inputs for selection of Pressure ratings of tube fittings

Series

LL

L

S

Design

Very Light (100 bar)

Light (up to 250 bar)

Heavy (up to 630 bar)

Sizes

4mm to 12mm

6mm to 42mm

6mm to 38mm

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