Partial Overlay Equipment

Equipment where some, but not all, retained fluid-wetted surfaces are either weld overlaid or weld clad with a corrosion-resistant alloy or an austenitic stainless steel to resist metal-loss corrosion.

Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards

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