The FPD212 dual-chamber orifice is a proven system for safely and quickly inspecting and changing orifice plates. Orifice meters used in the Oil & Gas industry are typically of either the single-chamber or dual-chamber design.
Single-chamber orifice fittings have an orifice plate that can be replaced without removing the fitting from the pipeline. However, before the plate can be withdrawn, the flow must be stopped and the pipeline vented.
Dual chamber orifice fittings such as the FPD212 have an extra chamber into which the orifice plate is first withdrawn; this chamber is then isolated from the pipeline. This means that the flow in the pipeline does not necessarily have to be stopped to enable removal and refitting of the orifice plate and, although the second chamber must be vented, there is no requirement to vent the pipeline section.