Choosing a Flexible hose for outlet air pressure vessel

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Discussion Overview

The discussion focuses on considerations for selecting a flexible hose for outlet air pressure vessels operating at 11 bar in industrial settings. Participants explore various factors, including working pressure specifications and the meaning of "instrument air." The conversation touches on standards, safety regulations, and practical applications in different environments.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant inquires about the considerations for choosing a hose with a maximum working pressure suitable for 11 bar applications, requesting sources for information.
  • Another participant suggests looking for standard air hoses, noting that a typical rubber air hose can handle up to 300 PSI (20 bar) working pressure.
  • There is a consensus that "inst air" likely refers to instrument air, which is compressed air that has been dried and is free of oil.
  • A participant mentions that instrument air is commonly used in industrial applications to operate valves and control devices, providing context for its use.
  • One participant shares their experience with instrument air pressure in their previous workplaces, indicating that typical operating pressures can vary significantly from the system design pressure.
  • Another participant emphasizes the importance of adhering to local laws and safety regulations regarding maximum pressure limits, particularly in California, suggesting the use of pressure regulators in assembly line settings.

Areas of Agreement / Disagreement

Participants generally agree on the definition of instrument air and its applications. However, there are varying opinions on the specific pressure limits and safety regulations that should be considered, indicating that the discussion remains unresolved regarding the best practices for hose selection.

Contextual Notes

Participants reference different standards and practices, but there is no consensus on specific pressure limits or the best hose specifications for the discussed applications. The conversation reflects a range of experiences and interpretations of safety regulations.

guideonl
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TL;DR
Flexable hose choosing for outlet air pressure vessel
Hi everyone,

What should be the considerations to choose the proper hose (max working press) installed at outlet air pressure vessels (11 bar) for industrial purposes? Please remark source\link.
Also, I've found a table which lists the max sys operating press for 4 different fluids (fuel, oil, hyd/pneu, inst air). What is the abrreviation inst mean?

Thank you
 
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Ask/look for standard air hose. The standard rubber air hose in a local hardware store is specified for 300 PSI (20 bar) working pressure.

Inst air is probably instrument air. Instrument air is compressed air that has been dried (moisture removed) and does not have oil added.
 
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Right, instrument air is used in industrial applications (eg, chemical plants, power plants, etc). The IA can be used to operate valves, and various control devices.

guideonl said:
... I've found a table which lists the max sys operating press for 4 different fluids (fuel, oil, hyd/pneu, inst air). What is the abrreviation inst mean?
This must be some kind of generic table listing "typical" values. The plants I worked in had instrument air at around 100 psig (6.9 barg). I do not recall the system design pressure (for the piping, etc.) probably twice or three times that. Many of the air-operated instruments run at much lower pressure. Pneumatic signals are typically 3-15 psi for 4 - 20 ma signals.
 
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jrmichler said:
Ask/look for standard air hose. The standard rubber air hose in a local hardware store is specified for 300 PSI (20 bar) working pressure.

Inst air is probably instrument air. Instrument air is compressed air that has been dried (moisture removed) and does not have oil added.
Thank you jrmichler
 
If this is for general use in areas like assembly lines for electronic equipment, pay attention to the local laws & safety regulations.

Here in California (and maybe Federal) there is a maximum pressure you must not exceed. I don't recall the exact number but believe it is around 30-50PSI (2-3bar).

We would put a pressure regulator at the head of each assembly line, but put one connector for "Supervisor Use Only" at the head end before the regulator to get the 100PSI (7bar) line pressure. That one got a lot of use!

Of course if you are powering tools or equipment you use whatever is needed.

Cheers,
Tom
 
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