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1 or 2 piles under a cap

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Does anyone have a rule of thumb for using less than 3 piles (helicals, in my case) under a pile cap? I've got a condition where I have some lightly loaded pile caps - about 45k - but their supporting pyramidal piers which have a 40" square base. The tops of the piers will support a beam line and concrete plank, so there's no lateral loads. The piers are 16-20' apart and are in a (roughly) straight line, so I can't efficiently combine multiple piers under a single footing.


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