Share: Specialty Welding and Turnarounds, LLC (SWAT), a leading provider of specialty welding and other highly technical services to the oil and gas refinery, biodiesel, petrochemical, and industrial markets, announced today the acquisition of Hydroprocessing Associates, LLC (HPA). Headquartered in Moss Point, MS, and with substantial operations across the South-Central and Western U.S., HPA provides specialized catalyst handling services for oil and gas refineries and petrochemical facilities. As part of the transaction, SWAT will also acquire Breathing Systems Inc. (BSI), a wholly-owned subsidiary of HPA which provides manufacturing, maintenance, and repair for NIOSH-approved life support systems worn by workers conducting catalyst change-out services.