This automated internal coating production line from QINGDAO HUASHIDA MACHINERY CO., LTD is specially engineered for oilfield OCTG (Oil Country Tubular Goods) , including tubing and drill pipe inner-wall anti-corrosion protection, covering pipe OD from 73 mm to 426 mm. The line integrates internal blasting pretreatment, high-pressure airless spraying and curing system to apply liquid epoxy coating uniformly on pipe bore. The cured epoxy coating delivers outstanding adhesion,