×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Need Help To Stop Fluids Flow After Volume X.
2

Need Help To Stop Fluids Flow After Volume X.

Need Help To Stop Fluids Flow After Volume X.

(OP)

 For some time I have struggled to find a system to permanently stop the flow of fluids through a micro pipe [2 mm] after the required volume has passed through. The micro pipe is not to be used again [contamination issues], so the "break" must be final, permanent.

  I cannot just replace the micro pipe. It has to be rendered non-usable.

  Any ideas?

RE: Need Help To Stop Fluids Flow After Volume X.

More information on the system is needed. Can you pinch the pipe and resistance weld it? Can you pinch it, cut it and bend? What is the pressure inside the pipe? What is the fluid, gas? etc.

RE: Need Help To Stop Fluids Flow After Volume X.

eldracm61,
The 2mm micropipe certainly is not typical piping.  Besides the info that is asked by israelkk, what is the material of the micropipe?  Does it become the package for the product volume?  What is expected to open up the package later? How many of these are to be 'stopped' and rendered non-usable?
Another method for closing off the ends might be using tapered plugs pressed into the ends of micropipe.  A fixture is visualized that would look like an angle globe valve with the valve stem pushing a tapered plug into the end of a micropipe held where the valve seat is normally located.  Another tapered plug could be at the fixed seat of this press fixture.  All of this fixture could have flow to fill the microtube and plug the ends.    

RE: Need Help To Stop Fluids Flow After Volume X.

To mechanically seal soft refrigeration tube, techs use a vise- grip type tool that presses a cylinder against a mating hemicylindrical die.  

Oriented across the tube, it forms a 'pinch' that can be reopened with some difficulty.  

Oriented along the tube, it caves in one wall completely and folds it against the opposing wall, making a permanent closure.  You may find such tools' tracks on the charging pigtail of a hermetic compressor.

Perhaps a smaller version could be fabricated.

Mike Halloran
NOT speaking for
DeAngelo Marine Exhaust Inc.
Ft. Lauderdale, FL, USA

RE: Need Help To Stop Fluids Flow After Volume X.

Make a visit to an electrical supply store or Home Depot type and look the electrical connector crimping tools.  Look at the one with replaceable dies so you will be able to modify if needed.  They have compound and ratchet types for additional leverage.

I wouldn't be surprised if Swagelock and the like didn't have one.

RE: Need Help To Stop Fluids Flow After Volume X.

Forgot to add that if there is possibility of cutting the tubing just a metal sleeve at the point of the crimp.

There are also production types that are pneumatically operated and can be set to give specific thickness crimp no danger of cutting the tube.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources