Orifice Plates

Cost-Effective DP Flow Metering
 

Overview

Orifice plates remain the industry’s most common DP element, valued for their low cost, compact size, and ease of replacement. The McMenon Orifice Plate range includes everything from simple square-edged plates to complete orifice unions and metering runs, tailored to your application.

Key Features

• Versatile range: Gas, wet‑gas, liquid, and steam service
• Multiple designs: Square‑edged, quarter‑circle, eccentric paddle plates
• Standards compliant: ISO 5167 & AGA 3 certified
• Modular assemblies: Raised‑face/flat‑face flanges, RTJ carriers, metering runs

Typical Specifications

Parameter	Value
Line sizes	2″–60″ (DN 50–DN 1500)
Accuracy	±1.0 %–1.5 % of reading
Turn‑down ratio	Up to 10:1
Pressure rating	PN 10–PN 100 (ANSI 150–600)
Materials	Carbon steel, 316/316L SS, Alloy 400, Duplex SS

Applications

• Custody transfer in oil & gas pipelines
• Chemical dosing and blending
• Water and steam distribution
• Process control and pressure reduction

Case Studies

Offshore Gas Export – Vietnam

McMenon supplied 55 Restriction Orifice plates for the Lac Da Vang offshore development, including multistage Alloy 400/22 % Cr Duplex plates and single‑stage plates in raised‑face, flat‑face, and RTJ carriers across 2″–8″ sizes. These high‑integrity plates enable precise flow control and pressure reduction in subsea export lines, ensuring reliable operation under aggressive marine conditions.

Natural Gas Conditioning – USA

For a major midstream operator in Texas, McMenon delivered 20 custom orifice plate unions to meter lean gas feed into a cryogenic recovery unit. Fabricated in 316 SS with 300 # flanges, the assemblies were pre‑calibrated to ISO 5167 standards, delivering ±1 % accuracy and seamless integration with the client’s SCADA system.