Purging liquid from a compressed air system is essential.

Most air system operators install automatic drains on all liquid collection points (e.g. tanks, dryers, separators, and filters).  Automation of the draining function saves time and money.

Some automated drains operate strictly on a timed interval.  These drains actuate independently of the liquid level in the system.  This means that not only liquid is purged.  So is compressed air.

Other drains operate on a demand basis, opening and closing in response to a positive signal.  These devices purge only liquid.  No compressed air escapes.  That's why these devices are called "zero loss" drains or "no loss" drains.

Why does this matter?  It's all about energy efficiency.  Compressed air requires a lot of electrical power to generate.  Wasting any of that air corresponds directly to wasted kilowatts-hours.

Does this mean you should never, ever install a timer drain?  No.  Not at all.  In fact timer drains are the most commonly sold type of drain, per Compressed Air and Gas Institute statistics.  In small air systems (less than 50 CFM) the higher cost of zero loss air drains can be a barrier.  

In air systems with older tanks and filters there tends to be a lot of corrosion and small particulate matter in the drain condensate.  Ball valve style timer drains are the only way to drain these vessels without constant nuisance plugging of the drain.  The energy cost of purging air is simply part of the price for operating old pipes and tanks.

Yet if you're working at an energy conscious company, installing a zero air loss drain must be on your list.  Your power utility might even offer a rebate on the purchase!

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