Dents in copper tubing elbows

[carddfann]

Hi,

I work for a company that does final assembly for AC products that are similar to small window AC units. We bring in the evaps and condensers prebuilt where we assemble and charge. Sometimes, the heat exchanges arrive with minor dents in an elbow or two due to shipping. Does anyone out there have any quality experience to suggest how to determine whether the dent is too big or too many for the exchanger to perform? In the past, it seems we made a judgement call and varies who looks at it so we don't know if we are rejecting a good exchanger or not. Would prefer not to have any dents, but world isn't perfect. Any thoughts? Many thanks!