Making an elbow on board on straight pipe but using formula so that it will perfect output .An Elbow is used to change the direction in piping and is also sometimes called a "quarter bend". A 90 degree elbow attaches readily to plastic, copper, cast iron, steel and lead. ... The main application area of an elbow (90 degree) is to connect hoses to valves, water pressure pumps, and deck drains

Fitter on ship and gives ideas for pipe fabrication, welding techniques, overhauling ship machineries ether mechanical or electrical drive , and also lathe machine on how to operates and making various job specially on threading jobs, making flanges, pumps bushing etc. .air condition technician and pipe fitters, making elbows in different degrees and reducer eccentric and concentric and metal fabrication, such as air duct, air venting mushroom and various modification