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Restriction orifice plate
Model : F400 series

Spec. sheet no. FD04-01
Description
Restriction orifice plates are widely used for many applications
within the industry. Although the design is very similar to
an orifice plate, the function is different. Restriction plates
are used to suit a number of different purposes including:
● Reduction in line pressure
● Control flow rates by restricting flow, regardless of
downstream conditions

Design considerations
● Prevent critical flow
● Removal of cavitation
● Reduce noise levels
We offer a number of different restriction designs to suit
the needs of your application

Configuration Applications
● Restriction plates (Standard applications) ● Hydrocarbon gas and liquids
● Multi-hole restriction plates (Used to reduce noise) ● Controlled pressure reduction
● Multi-stage restriction units (Flanged / Butt-weld) ● Blow-down service
● Conical shaped restriction orifice (Eliminated damage ● Pressure vessels
caused by cavitation) ● Noise reduction

Benefits Key parameters
● Proven design technology ● Proven technology
● Products designed in accordance with R.W.Miller - Flow ● Prevent critical flow or cavitation issues
engineering handbook ● Reduce site restrictions and noise levels
● Plate thickness calculations designed in accordance with
ASME B31.3 Standards
● Designs available to accommodate site restrictions and ● R.W. Miller
noise limitations ● ASME B31.3
● Prevent critical flow or cavitation issues ● ISA standard design
Specification

Line size Plate and carrier material
DN15 to DN1,800 Stainless steel
½" ~ 72" Duplex
Super duplex
6 Mo
Alloy 400
Designs Inconel 625
Restriction plate Inconel 825
Full-face restriction plate Hastelloy-C 276
Restriction carrier Titanium
Multi-hole restriction plate Others available on request
Multi-stage restriction unit
Conical shaped plate Installation method (Between)
Flanged (API / ASME)
Hubs
Carriers
Reynolds number Welded directly into piping
Unlimited range Multi-stage units supplied flanged or butt-weld

F400_01