SPRING, Texas--(BUSINESS WIRE)--Perma-Pipe International Holdings, Inc. (NASDAQ: PPIH) today announced that its Saudi Arabian business unit has received formal technical and commercial approval from Saudi Aramco, the world's largest oil company. This approval significantly expands Perma-Pipe's business opportunities in the Kingdom, enabling the Company to directly serve the oil and gas sector, a critical step forward in its long-term strategic plan to strengthen its presence and broaden its pro. ...