[labnetwork] Stainless Steel Tubing

[John Boyle]

I ran a quick calculation at your flow for a gas as heavy as propane in a ¼” ODT and it would be in the 2-5 PSI range. H2 pressure drop is under 1 PSID. 

 

Often piping contractors like to use 3/8” as it is more rigid and pipe-like, easier to keep straight and does not need tubing supports as close together. This is especially true in longer tube runs where ¼” can show a visible “droop” .

 

 

John Boyle

John Boyle Consulting, LLC

4848 Canterbury Drive

Emmaus, PA 18049

484-432-7596 Cell

610-965-3208 Office

 

 

 

From: labnetwork [mailto:labnetwork-bounces at mtl.mit.edu] On Behalf Of Dennis Schweiger
Sent: Friday, September 02, 2022 5:45 AM
To: John Ransom
Cc: labnetwork at mtl.mit.edu
Subject: Re: [labnetwork] Stainless Steel Tubing

 

John,

 

Good morning.  My rough guess is that 1/4" will be fine for your application, but without knowing the gas (density), and the delivery pressures, it's hard to give a definitive answer.  The larger tubing size would give you a future margin for error if your process needs were ever to change, and using an HVCR fitting still gets you a connection that will work with the 1/4" VCR components.

 

One of the things you could consider is to deliver to the tools at a higher pressure, then step the pressure down at the tool with a mini regulator of some sort.

 

It's hard to provide a better answer without knowing more about your delivery system.

 

As always, if you want to discuss further, please feel free to give me a call.

 

Good luck,

 

Dennis Schweiger

University of Michigan/LNF

Facilities Supervisor

 

734.647.2055 Ofc

 

On Thu, Sep 1, 2022 at 5:25 PM John Ransom <jaransom at uark.edu> wrote:

I have gotten recommendations that I should use 3/8” SS tubing EP 316L, but the availability of that is out into May or June of 2023.  ¼” is better.  

 

But can I use ¼” with a process that runs <1slm?  The fittings to most of the tools is ¼” VCR or swagelok.  But I have a 90ft run in one case.  Any guidance is appreciated.

 

John Ransom

Program Manager – MUSiC Facility

Multi-User SiC Fabrication Facility

University of Arkansas

 

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