Each type of standart orifice meters are characterized by the arrangement of pressure tappings where locations' of them differs for each type of orifice meters.

Here are some techical details of our orifice meters:

Orifice plate inside the pipe shall be cicular and concentric with the pipe centerline. The face of plate shall always be flat and parallel.

Bidirectional Orifice Plates:

If the orifice plates is intended to be used for measuring reverse flows, some restrictions shall be applied when designing.

  • The plate shall not be bevelled
  • The two faces shall comply with the specificaitons for the upstream face  mentioned in ISO 5167.

For Pressure Tappings:

At Least one upstream pressure tapping and one downstream pressure tapping shall be installed one or other standard locations. In other words as D & D/2, flange or corner tappings.

The typical uncertainty of uncalibrated orifice plates is +/-0,5%.

Common pressure loss of orifice plates vary between 40 to 95% of the gernerated differential pressure. The actual permanent loss of pressure can be calculated from  the Beta-Ratio.

DIAMETER RANGE:Inner Diameter between 50 mm and 1000 mm according to ISO 5167, ASME MFC-3M
(Inner Diameter down to 25 mm according to ISO/TR 15377)
FLOW RANGE:5000 ≤ ReD for standard orifice plates
(80 ≤ ReD for orifice plates according to ISO/TR 15377)
PRESSURE RANGE:Up to Sch XXS according to ASME B36.10M for piping
Up to 2500 Lbs. according to ASME B16.5 for fittings
CONNECTION TYPES:Weld End according to EN 9692-1 or ASME B16.25
Flanged End according to EN 1092-1 or ASME B16.5
Other type of connection upon request
MATERIAL:Generally AISI 316 for Orifice Plates
Any type of steel body according to system requirements
MEDIUM:Water, Steam, Air, Natural Gas, Combustion Gas, Hydrogen, Nitrogen, Oil, Oven Gas and any
other fluid of which thermophysical properties are known
IOMaster FPD510
OriMaster FPD500