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Arun.Kumar
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Join Date: May 2011
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Tubing

05/16/2011 7:28 AM

What is the Difference between Inpulse Tubing and Capillary tubing...?
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PWSlack
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#1

Re: Tubing

05/16/2011 7:38 AM

In what context?

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Arun.Kumar
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#2
In reply to #1

Re: Tubing

05/16/2011 7:44 AM

Bascially I am a Mechanical Engineer, there was a Discussion happening within our design team About selection of Which type of tubing can be used for Level Transmitters. Someone tells that the impulse tubing is better than a Capillary tubing. And I cannot understand the difference..?
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PWSlack
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#3
In reply to #2

Re: Tubing

05/16/2011 7:50 AM

Ask the someone to explain, then.

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Arun.Kumar
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#4
In reply to #3

Re: Tubing

05/16/2011 7:56 AM

Thank you So Much....
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Iris
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#5

Re: Tubing

05/16/2011 10:52 AM

I use the term "Impulse line" for the connection from the process to the instrument. The impulse line can be either tubing or pipe.

I would assume "Impulse tubing" to be commerical tubing, rated for the pressure involved.

In the USA, tubing is classified by its OD, pipe by its ID. Tubing is never threaded; flare or compression fittings are used for connections to the instrument.

Capillary tubing is very small diameter tubing which is always used for filled systems, like for the connection between the instrument and a remote diaphragm seal. On rare occasions, capillary tubing is used as a mechanical damper to dampen pressure oscillations. Capillary tubing will slightly delay, but not diminish pressure spikes.

My 1960's era Industrial Instruments and Control Piping book, an instruction guide to teach apprentices how to install piping, shows all connections in pipe, no tubing.

The table below shows sizing considerations for impulse lines
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Arun.Kumar
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#6
In reply to #5

Re: Tubing

05/17/2011 12:56 AM

Hi...

Thanks...that helps me a lot...
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PWSlack
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#8
In reply to #6

Re: Tubing

05/17/2011 4:58 AM

It seems a pity that the "someone" didn't know that....

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Tornado
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#7

Re: Tubing

05/17/2011 2:59 AM

For level transmitters, capillary tubing would NOT be acceptable; too small in diameter to allow suitable flow under low pressure differentials.

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RAMConsult
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#9

Re: Tubing

05/17/2011 9:27 PM

Amazing what a EE can ferret out of the web with a simple Google query.. http://www.flowcontrolnetwork.com/containment/hose-and-tube/article/considering-capillary-tubing

Is the advice useful? I will leave that to the members with the proper training and experience.

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Users who posted comments:

Arun.Kumar (3); Iris (1); PWSlack (3); RAMConsult (1); Tornado (1)

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