This Specification supplements the requirements of ASME B16.9, ASTM A234 for Grade WPB wrought carbon steel pipe fittings, and MSS SP-75 for high strength fittings. Normally, it only applies to fittings that are purchased "loose." This Specification does not apply to fittings installed on equipment that is engineered, manufactured, and tested prior to delivery to the Company unless specifically invoked in the Purchase Order. 1.2 Cast fittings, stainless steel and corrosion-resistant alloy pipe fittings, and pipe bends with a radius three times the diameter (3D) or greater are excluded from the scope of this specification. 1.3 Fittings purchased in accordance with the requirements of this Specification are deemed to be suitable for wet, sour services without additional testing or certification.