Question: what is the difference between gi and gp pipes?
Answer: GI - Galvanized Iron (GI is used to galvanize iron as well as steel. Iron was first found and used. ... GP - Galvanized Pipe, more recent name for galvanized pipe. Hotdip - Galvanizing is done by many methods, like dip in a hot liquid zinc bath, zinc electro-plating/coating, Zinc spray etc.