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1/4" poly tubing question

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  • cactusman
    started a topic 1/4" poly tubing question

    1/4" poly tubing question

    At Home Depot they sell 1/4" opaque poly tubing. This tubing is typically used in hooking up
    water and ice-makers ....
    I wonder if anyone knows what the PSI rating is?
    I asked the orange apron and he simply shrugged his shoulders and said "have a nice day"

    In the same aisle there was some black 1/4" tubing used for a drip system..again no PSI rating...anyone?

    I am looking for tubing 1/4" and a rating of 200-250PSI
    I am installing a Hadley air horn in my vehicle and the local auto supply stores only carry 3-6
    foot lengths in bubble packs I need 25-50 feet. The horn compressor is 150PSI and there is a small storage air tank.

    Running 1/4" copper is not going to work as I need to run tubing from under the hood to the dash board and to the rear of the vehicle.

    Thanks for any help


    Cactus Man

  • Bob D.
    replied
    Re: 1/4" poly tubing question

    IF you really want to know the pressure rating of the tubing sold in any big box store, ask one of those "trained sales associates" for the MSDS papers on that particular product. By Federal Law, they are required to carry these on every product they sell within the store.
    Sorry, but I don't believe this to be an accurate statement. There is no requirement that I am aware of that would make HD or any other seller carry a MSDS Sheet for "every product they sell". Your state's Right To Know Law and federal law (OSHA and EPA) require MSDS sheets for hazardous chemicals. But your statement of "every product they sell" would include such items as bottled water, magazines, candy bars, ALL lumber products (not just treated lumber), nails/screws/etc., and a slew of other materials which don't warrant a MSDS Sheet.

    Yes, if you ask for a MSDS sheet they need to supply one... for those materials where a MSDS has been issued by the manufacturer. The whole manufacturing/distribution chain is responsible to see that MSDS sheets make it to the end user.

    As far as the statement by the OP that the max expected pressure is about 90 PSI, that's not the way to design or spec out a project. What is the maximum pressure that the system could be subjected to? ie, what is the MAX pressure of the compressor and/or relief valve setting, these are the determining factors which the tubing could be subjected to, and a safety margin needs to be applied on top of that. So your tubing, fittings, and all other components of the system need to be rated for a working pressure that is equal to or greater than the MAX system pressure that can be generated, which may or may not be 90 PSI.

    Leave a comment:


  • cactusman
    replied
    Re: 1/4" poly tubing question

    Thanks wookie but the pneumatic part of the air horn project is complete.
    I decided to use 1/4" copper for the long [almost] straight run from the rear of the van to just under the dashboard.

    I then used the "supplied" poly tubing for the run up into the dashboard for the pressure gauge and then out the firewall into the engine compartment. These are essentially very short runs. I may replace the poly tubing in the engine compartment with a short run of copper if I get the motivation. I'm locked in inside the dash with poly as fishing copper tubing is just not a viable option.


    I am very familiar with MSDS [material safety data sheets] as I was the safety officer at one hospital I worked at.... Great idea, great information oh and by law required! but brutal on the departments and staff understanding its purpose and keeping the documents current!

    Maintaining a proper MSDS notebook as a resource requires a full time employee doing only that....Yeah Home Depot has a dedicated employee maintaining the MSDS file [I'll avoid the rant at this point]. To be fair, I doubt the local ACE Hardware store has a "current" MSDS notebook!

    The particular Home Depot store I frequent because it's nearby has maybe one or two intelligent sales persons! The rest can be classified in two categories..those that speak some form of English and those that can't!

    I say sarcastically that the salesperson I asked about the pressure tubing psi rating did not have the ability to even spell MSDS!!!!!!!

    By the way the electrical end of this project is almost complete too. I need to dress some wires under the dashboard. Instead if using fuses, this time I opted for circuit breakers.

    I have a 30 amp breaker for the compressor, 20 amp breaker for the air solenoid, and OK a fused line from the ignition switch to the control relay circuit.

    Hadley dual air horns 135DB of loud to remind you to put the phone down, put the burger down, quit picking your nose while singing along to an old carpenter's song and make that damn left turn before the light turns yellow..there are no opposing cars coming!


    Cactus Man

    Leave a comment:


  • wookie
    replied
    Re: 1/4" poly tubing question

    polypropelyne made by Parker. I'd use compression fittings.

    wookie

    Leave a comment:


  • BHD
    replied
    Re: 1/4" poly tubing question

    http://www.dripirrigation.com/index.php?cPath=36_110

    not saying this is the same stuff you wre looking at, but this companys is rated for up to 60 psi, in 1/4"

    Leave a comment:


  • Thurman
    replied
    Re: 1/4" poly tubing question

    IF you really want to know the pressure rating of the tubing sold in any big box store, ask one of those "trained sales associates" for the MSDS papers on that particular product. By Federal Law, they are required to carry these on every product they sell within the store. I do this just to be a plain A**hole when I really need to know an answer the these poor store clerks have no clue as to the answer. This will get the manager involved, and probably the Human Resources person as well, because-no one knows where they keep the MSDS sheets. Parker does sale (make?) a tubing product that is rated for 250# or air pressure. We used rolls of this in my last job before retirement . It comes in different sizes as well, uses something like "sharkbite" fittings, and we had very little problems with these. Even though you have found a solution to what you need, keep in mind McMaster-Carr for future Industrial rated products. Thanks, David

    Leave a comment:


  • wrench spinner
    replied
    Re: 1/4" poly tubing question

    sin flex is the slang term for the stuff you want any heavy truck parts house carries the stuff

    Leave a comment:


  • cactusman
    replied
    Re: 1/4" poly tubing question

    Thanks everyone....

    OK I bit the bullet and now the project will be a hybrid!

    I am running copper 1/4" tubing for 80% of the pneumatics.
    The small loop from the compressor to the air tank is from the short supplied plastic
    type tubing.

    The run up into the dashboard and out to the engine compartment will also
    be that plastic type tubing as it will be almost impossible to run the copper without kinks

    The air horn will typically use around 90PSI per "honk" and will be 135db of loud. Air tank and switch is set for 145PSI.

    So when driving behind a hybrid golf cart doing 25 in a 45 zone I'll sound like a
    Peter-Built or Mack truck bearing down behind you fast and determined!


    Cactus Man

    Leave a comment:


  • Plumbus
    replied
    Re: 1/4" poly tubing question

    The product the big box stores carry probably originates from China. I'd avoid it like the plague.

    Leave a comment:


  • JTROANOKE
    replied
    Re: 1/4" poly tubing question

    The company I work for uses some plastic tubing for high pressure chemical injection that is rated at 700 PSI or thereabouts. Try to find a Parker distributor who will sell in small quantities.

    Leave a comment:


  • toolaholic
    replied
    Re: 1/4" poly tubing question ASK THE INSURANCE CO'S!!

    Go only copper,or stainless braided. S.S.braided has the fittings is safe and takes no skill.
    About poly, replaced whole 1 st floor hardwood flooring [ click wood over concrete ] because of poly failure failure. His home owners Ins. paid for it. THANK GOD ,I didn't install the tubing! Came with the home

    Leave a comment:


  • lovetheUSA
    replied
    Re: 1/4" poly tubing question

    For sure, the black drip tubing would not handle any where near 250 PSI. I doubt that the milky white PE is rated that high, as well. The fittings available in the supply store for PE ( compression or push-in) also would not be acceptable for that much pressure.

    Leave a comment:


  • stokefire7
    replied
    Re: 1/4" poly tubing question

    Try D. O. T. airline tubing

    Leave a comment:


  • Bob D.
    replied
    Re: 1/4" poly tubing question

    www.parker.com

    Products -> Tubing -> Thermoplastic Tubing

    Leave a comment:


  • Big Jim
    replied
    Re: 1/4" poly tubing question

    The Viega pex tubing I use is only rated
    at 100 psi. I doubt you will find a plastic
    tubing that will suit your needs unless there
    is some specialty composite product out there.
    No way to bend and fish that soft copper, eh?

    Leave a comment:

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