Sadie,
A holding tank will not give you any more pressure. Whatever your oxycon puts out that's what you will get, holding tank or no holding tank.
Think of it like a water hose. Water comes out as long as the valve is open. Shut the valve and the water stops almost immediately; the little afterflow is what is in the hose. Now put the hose into a big barrel and connect your hose to the bottom of the barrel. Shut the valve and water will run out for a long time until the barrel is MT. Same with a holding tank. It is nothing more than a resevoir of gas that will keep the pressure up if you suddenly need a larger flow for a short time. It will also even out any pulsations in the flow if your oxycon 'puffs' as some do.
PJ
Make sence??
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