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Inert Gas Plumbing

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  • dcsound
    replied
    Thanks for the information.

    DC

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  • klsm54
    replied
    DC,

    You CAN mix your own welding gases, but in the small shop, I doubt that it would be cost effective. Mixers are set up for specific gases, but the percentages are easily changed. Smith has units for smaller users.... SMITH MIXERS

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  • dcsound
    replied
    Thanks for the info on the fittings. My logic in asking about the gas blender for welding is this. Instead of keeping tanks on hand of various gas blends, one would stock tanks of the primary gases and set the gas blender appropriately for the shielding gas required. The blender would live between the tanks and the welder. I thought that it the concept works for beer, it would also work for welding. Maybe not.

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  • Alex
    replied
    a few cold ones?

    DC,
    The fitting for the CO2 is a CGA-320. Nitrogen is the same as for He/Ar, CGA-580. For blending gases, you'll need a manifold. The gas for Guinness is commonly called "alley" gas. As you mentioned, mostly Nitrogen. As for blending your own gases for welding, why? Any gas mix used for welding is already available from your local welding supply and they have VERY specialized equipment for that purpose. I think you'd have an extremely difficult time replicating your own mixtures from tank to tank, and shielding gas plays a VERY significant role in the welding process. A lot more than just shielding the weld pool from the atmosphere.

    Be cool,
    Alex

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  • dcsound
    started a topic Inert Gas Plumbing

    Inert Gas Plumbing

    This isn't directly a welding question, but it deals with the same gases used for shielding, and since many of you probably enjoy a cold beer, so I'll go ahead and ask.

    My place of work , a live music club/restaurant/banquet facility recently sustained major damage from flooding after the passing of Hurricane Ivan.
    We are in the process of replumbing the draft beer and pop systems and I was wondering if the fittings used on CO2 and Nitrogen cylinders had names or thread sizes. The CO2 appears to have a fitting with an external thread and the N has a fitting with an internal thread. I need to order some fittings and custom hoses and it would be helpful to know what to order. We are trying to do the work ourselves to keep costs down. The way the system was plumbed before, the regulators did not live on the tanks, they were wall mounted and connected with a high pressure hose. This was done to allow a changeover valve from our bulk tank to individual tanks.

    We also have a beer gas blender which takes in CO2 and N and outputs mixed gas in two variable percentages as Guiness requires a blend richer in N.
    Does such a box exist for welding, so that multiple gas blends need not be stocked. I am planning on purchasing an MM251 with both guns in the future and wondered if gas blenders were available for welding as well as beer.

    Thanks for any info.

    DC
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