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Thread: Finding the best torch handle and tips to work with propane

  1. #81
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    Default Re: Finding the best torch handle and tips to work with propane

    Quote Originally Posted by Doug Fattic View Post
    ... I just tried last night my Meco Midget torch handle with a Meco #5 tip last night using one of my Devilbiss 5lph concentrators to supply the oxygen. It works fine even when I switched to a larger Paige MX tip. ...
    That seems to perhaps negate the comments by 'surlypud'(Chris?) in post #11 of the thread 'Propane and propane related accessories' (https://www.velocipedesalon.com/foru...ies-35064.html) mentioning how the combination of a Midget's smaller diameter mixer + oxygen concentrators' limited output pressure can cause a lack of O2 supply issue when a large flame is desired.

    If you recall that meeting with 'surlypud', I'd appreciate YOUR clarification about what the problem was in his case.
    Jihoon Jo

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    Default Re: Finding the best torch handle and tips to work with propane

    Quote Originally Posted by Ahmdo Molah View Post
    That seems to perhaps negate the comments by 'surlypud'(Chris?) in post #11 of the thread 'Propane and propane related accessories' (https://www.velocipedesalon.com/foru...ies-35064.html) mentioning how the combination of a Midget's smaller diameter mixer + oxygen concentrators' limited output pressure can cause a lack of O2 supply issue when a large flame is desired.

    If you recall that meeting with 'surlypud', I'd appreciate YOUR clarification about what the problem was in his case.
    It was 8 years ago I met with surlypud so I don't remember the details except it was a nice visit.

    I did go to the shop this morning and again tried my Meco Midget with a Meco #5 tip as well as a Paige MX tip using my Devilbiss 515 concentrator. That combination worked fine but the restriction of the oxygen supply through the torch handle and elbow only allowed the flame to be at about a middle setting. When I put the same tips on my Uniweld 71 torch handle with a UN-J mixer/elbow, I could turn up the oxygen to a greater volume than I could with the Midget. The Uniweld allowed for a greater volume of oxygen flow through its bigger holes and as a result provided a more powerful flame using the same tips.

    A Meco Midget torch handle is pretty small. I suppose it was designed for the jewelry trade. To make it bigger to my liking, I added A size flashback arrestors to the bottom of the handle so it fit my hand more comfortably. They are pretty expensive at around $70 a pair. The elbow screws onto the top of the handle and has a pretty small ID.

    In the same way, 5 lpm concentrators can not only put out more or less volume but they can also vary at how pure of oxygen they are putting out too. My Invacare concentrators work fine but my Devilbiss 515 and 525 concentrators put out a greater volume of oxygen. Concentrators to keep grandma alive should produce around 92% + - oxygen. I have a Devilbiss 525 model that puts out around 80% that works fine with all my tips.

  3. #83
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    Default Re: Finding the best torch handle and tips to work with propane

    Quote Originally Posted by Doug Fattic View Post
    ...

    I did go to the shop this morning and again tried my Meco Midget with a Meco #5 tip as well as a Paige MX tip using my Devilbiss 515 concentrator. That combination worked fine but the restriction of the oxygen supply through the torch handle and elbow only allowed the flame to be at about a middle setting. When I put the same tips on my Uniweld 71 torch handle with a UN-J mixer/elbow, I could turn up the oxygen to a greater volume than I could with the Midget. The Uniweld allowed for a greater volume of oxygen flow through its bigger holes and as a result provided a more powerful flame using the same tips.

    A Meco Midget torch handle is pretty small. ... The elbow screws onto the top of the handle and has a pretty small ID.

    In the same way, 5 lpm concentrators can not only put out more or less volume but they can also vary at how pure of oxygen they are putting out too. My Invacare concentrators work fine but my Devilbiss 515 and 525 concentrators put out a greater volume of oxygen. Concentrators to keep grandma alive should produce around 92% + - oxygen. I have a Devilbiss 525 model that puts out around 80% that works fine with all my tips.
    Thanks Doug for the reassuring clarification. So it's not just the mixer(handle) but also the relatively smaller ID of the Midget's elbow that contributes to the 'bottle neck effect' when used with an oxygen concentrator instead of a high pressure O2 tank. I'm comfortably reassured with my leanings towards the Smith AW1A torch and AT61 mixer for use with an oxygen concentrator.

    The Kroeber Aeroplus 5 oxygen concentrator I'm keeping an eye out for is a 5lpm unit with a max output pressure of 70kPa (10psi) and O2 concentration range of 95%(-3%) - 85%(+/-3%) depending on the output setting, so it should be sufficient if I can score one in decent used condition for a reasonable price. At least there is a small yet steady circulation of them in the 'dog boomer' scene.
    Jihoon Jo

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