Orifice plates are widely used for flow measurement as they provide the simplest and the most economical means of flow detection. Orifice plates are available in the concentric type that the round opening (bore) of the orifice plate is positioned concentrically with the center of the pipe and the opening edge (bore edge) is available either in the concentric square edge type (sharp. square edge type) or in the quadrant edge type (round edgy type).
Orifice plates are also available in the eccentric type that the opening of the orifice is shifted from the center of the pipe. They also are available in the segmental type that the opening is a circular segmental segment and the orifice is comparable to a partially opened gate valve.
Concentric Square Edged Orifice
Quadrant Edged Orifice
AGA report #3
ASME MFC-3M (R.W Miller)
JIS 10, 16, 20, 30, 40, 63
ANSI Class 150, 300, 600, and 900, 1500, 2500
Vena contract taps
1D and 1/2D (Radius) taps
2” to 24”
For size beyond this limit, consult factory
3, 6, 9, 12mm
Welded to orifice plate
Integral with Orifice Plate
Standard: 304SS, 316LSS
Non-standard: Monel, Hastelley B/C, Titanium etc.
Per ASME recommendations
Not drilled for orifice bores smaller than 25.4mm
Upstream side of tab handle stamped “UPSTREAM” and with bore type and size, line size, tag number