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RIB ENGINEERS INSTRUMENTS Make By-pass Rotameters are suitable for flow rate measurement in 2’’ NB or 24” higher size pipes. The instrument
is simple in construction and reliable in flow rate indication. The complete assembly consists of carrier rings/flanged taps, bypass line and a Rota meter
as indicator. The orifice plate dimension is based on BS/ISO- 5167 specification.
Principle
- By Pass Rotameter is an inference type Rotameter & fixed Orifice in a pipeline.
- Differential pressure (DP) is created in the main pipe line by providing an Orifice Plate in the main Pipe line. Because of this differential pressure a
branch of flow moves through by-pass line provided across the orifice plate from upstream side to down-stream side of Orifice Plate. - An additional range orifice plate is provided in the by-pass line which is designed such that flow through by–pass line (through range orifice plate)
flows in proportion with the flow through main pipe line (Main Orifice Plate). - Hence by measuring the flow from By-pass Line we can estimate the flow through Main pipe Line