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TSM 363 Fluid Power Systems. Hydraulic Hoses & Pipeline. Conductors for Fluid Delivery. It’s common for using hoses and tubes on ORE as fluid conductors. Hoses are flexible and tubes are rigid conductors. There are three criteria in selecting the conductors.

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tsm 363 fluid power systems

TSM 363 Fluid Power Systems

Hydraulic Hoses & Pipeline

conductors for fluid delivery
Conductors for Fluid Delivery

It’s common for using hoses and tubes on ORE as

fluid conductors

Hoses are flexible and tubes are rigid conductors.

There are three criteria in selecting the conductors.

Rule of thumb: use flexible hoses whenever you can.

typical structure of hydraulic hoses
Typical Structure of Hydraulic Hoses

Inner tube: Oil resistant thermoplasticflexible tube Direct contact with the hot hydraulic oils

Reinforcement layer:making hoses stronger

wire- or fabric-reinforced

outer layer: endure the useful life

weather, oil, or abrasion-resistant.

commonly used hoses fittings
Commonly Used Hoses Fittings

It is a must to use some types of hose connectors(often calledfittings), either reusable or no-reusable, for connecting hoses.

pressure rating of conductors
Determination of working pressure:

SF: safety factor. It is recommended to take SF=8 for pressures below 1000 psi SF=6 for pressures between 1000~2500 psi SF=4 for pressures above 2500 psi

Pressure Rating of Conductors

Two Pressure Ratings: Burst Pressure (BP) – the fluid pressure will cause the pipe to burst.

Working Pressure (WP) – the maximum safe operating fluid pressure

sizing the conductor
Fluid velocity is determined by the following equation:

The recommended fluids velocity for different conductors:

Pump inlet line: 4 ft/sec

Pressured lines: 0-500 psi 15 ft/sec

500-3000 psi 20 ft/sec

over 3000 psi 25 ft/sec

Return line: 15 ft/sec

Sizing the Conductor

The size of the hose/tube in a fluid power system is

determined based on the velocity of the fluids moving

the conductor.

exercise select conductor uses nomograph
100

50

40

5

30

4

3

20

2

1 1/2

10

2

1

3

3/4

5

4

4

5

1/2

3

2

10

1/4

1

20

1/8

30

0.5

40

50

Flow

(GPM)

I.D.

(inch)

Velocity

(ft/sec)

Exercise: Select Conductor Uses Nomograph
stamped procedure of hose selection
STAMPED procedure of Hose Selection

The Size of the hose is determined based on the velocity of the fluids moving in it.

The operationTemperature rangeof a hose is determined by the materials in the hose is made of.

A good Applicationplanis to route the high-pressure lines parallel to machine contours whenever possible.

It is mandatory to check the compatibility of hose fabricatingMaterialsbeing used with the fluids used in the system.

Hose rated working Pressure needs to be chosen correctly forsafe operation.

Use of proper fittings on both Endsof the hose segments.

The Deliverability of the selected components in a timely manner.

lecture summary
Lecture Summary
  • Discussed the basic concepts of hydraulic hoses:
    • Fabrication
    • Application
  • Introduced basic concepts of hydraulic manifolds:
    • Single valve
    • Integrated valves
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