pressure drop is the most common cause of complaints involving "loss of power"
in portable air tools. When such a complaint arises, be sure that someone takes a
pressure reading at the tool while the tool is turned on ... governed tools while under
The most common
causes of excessive pressure drop are restrictions to air flow in long lengths of small
diameter pipes and hoses, in hose fittings, filters, lubricators, and especially in quick
disconnect couplings. For large volumes of air, large lines and fittings are