ASTM cast iron 180 degree seamless elbow pipe fitting through API certificate

Different diameters are called different diameters for different diameters. The same diameter at both ends is called equal path three. Different routes are widely used in the construction and overhaul of petrochemical, petroleum and natural gas, liquefied gas, chemical fertilizers, power plants, nuclear power plants, shipbuilding, papermaking, pharmaceuticals, food hygiene, and urban construction.