At 14:44hrs Tanker 22 and Battalion 21 (Krenek) were requested to assist the Sugar Land Fire Department with an unknown type structure fire in the 9700 block of Gaines Rd. Upon arrival fire was found to be involving multiple large outside pipe racks holding coated pipes with a column of smoke visible for miles. While the crew assisted with water supply Booster 22 and Engine 24 (Slay), also requested for an adjacent area of brush, arrived on scene and began operations. With multiple large hand lines and 1-ladder pipe operating with limited effect the IC requested Foam 21 to the scene with Squad 21 (Parker) given the burning pipe coating. Upon setting up for foam operations companies transitioned all fire attack to the foam unit and achieved a knockdown with the 500-gallons of AR-AFFF carried on board. Following overhaul and assisting on scene all units returned to service by 20:30hrs. Additional units on scene were Safety 21 (Magana) and Car 2 (Burns).