FPD220 Dual-Chamber Orifice Fitting Manual

This document describes ABB's FPD220 dual-chamber orifice fitting, which provides double block and bleed functionality for safely inspecting and changing orifice plates in pressurized gas pipelines without interrupting flow. It highlights safety features such as visible proofing, automatic valve latches, soft seat seals, and compliance with HSG253 Category II 'Proved Isolation' requirements, along with technical specifications for high-pressure applications up to ANSI 2500.