1. Orifice Plate

Orifice Plate

Application Areas

• Power generation

• Oil production and refining

• Water treatment and distribution

• Gas processing and transmission

• Chemical and petrochemical industries

Special Features

• Maximum operating temperature and pressure are determined by the material used and the flange standard.

• Suitable for liquid, gas, and steam flow measurement.

• Accuracy: ≤ ±0.5%

• Measurement repeatability: ±0.1%

Description

Easy installation and operation

Differential pressure flowmeters are used in many industrial applications.

Orifice plates are the most commonly used solution as the primary flow element.

They are easy to install and operate.

The differential pressure generated by the primary element is generally converted into an electrical signal proportional to the flow rate by a differential pressure transmitter.

Design optimized according to customer requirements

TLY Enerji's flow elements are designed according to the customer's process conditions.

The bore diameter is calculated according to the flow characteristics of the plant.

Products are available with RF, FF, or RTJ sealing face options.

Designs compliant with customer standards can be manufactured for special applications.

Orifice Plates

Description

Orifice plates are the simplest primary flow elements.

The bore diameter is calculated to generate a specific differential pressure at the full flow rate.

Orifice plates suitable for different media are available.

Materials

• Stainless steel (standard)

• Hastelloy C-276

• Monel 400

• Duplex

• Super Duplex

• Others available upon request>

Application Table

"++" indicates preferred, "+" indicates suitable, and "–" indicates not suitable.

Design and Types

Square-Edged Orifice Plate

Suitable for general applications involving clean liquids and gases.

• Design: ISO 5167-2

• Nominal size: ≥ 2" (50 mm)

• Nominal pressure: According to customer requirements

• Beta ratio: 0.20 – 0.75

• Accuracy: ≤ ±0.5%

• Repeatability: 0.1%

Quarter-Circle / Conical Entrance Orifice Plate

The most suitable version for liquids with low Reynolds numbers.

• Design: ISO/TR 15377

• Nominal size: ≥ 2" (50 mm)

• Beta ratio: 0.10 – 0.316 (Conical Entrance) / 0.245 – 0.600 (Quarter-Circle)

• Accuracy: ≤ ±2%

• Repeatability: 0.1%

Eccentric Orifice Plate

Used for two-phase, particulate, or dirty fluids.

Provides a better solution than the segmental type for small diameters.

• Design: ISO/TR 15377

• Nominal size: > 4" (100 mm)

• Beta ratio: 0.46 – 0.84

• Accuracy: β < 0.316 → ±2.5% / β ≥ 0.316 → ±2.0%

• Repeatability: 0.1%

Segmental Orifice Plate

Used for two-phase, dirty, and particulate fluids.

• Design: ISO / ASME

• Nominal size: ≥ 4" (100 mm)

• Beta ratio: 0.35 – 0.80

• Accuracy: ±1 – 2%

• Repeatability: 0.1%

RF Raised Face Flanges (Sealing Face for Raised Face)

Description

The RF (Raised Face) type is the most commonly used sealing face and is suitable for medium pressure and temperature conditions.

Surface Roughness

125 – 250 AARH

According to the ASME B16.5 standard, the flange and orifice plate sealing surfaces are manufactured with a surface roughness compatible with the gasket.

Ring Joint Gasket (Optional)

Used for high-pressure and high-temperature applications.

Versions: Octagonal, Oval

Application Standards: API 6A, ASME/ANSI B16.5, ASME B16.47 Series A, BS 1560

Surface roughness is < 63 AARH and complies with the relevant flange standards.

Drain or Vent Hole (Optional)

Depending on the process fluid, a drain or vent hole may be required.

Hole dimensions are designed based on international standards and engineering experience.

RF Flanşlar İçin Standart Plaka Kalınlıkları

The specified values are based on a differential pressure of 1,000 mbar.

Other thicknesses can be manufactured upon request.

Orifice Flanges

Description

Special orifice flanges are used instead of standard pipe flanges for the installation of orifice plates or flow nozzles.

These flanges have pressure taps machined directly into them, eliminating the need for a carrier ring.

The plate can be easily removed and installed using jack screws.

Nominal Size and Pressure Class

Compliant with all international standards.

The pipe schedule is specified by the customer.

Materials

• Carbon steel (ASTM A105)

• Low-temperature carbon steel (ASTM A350 LF2)

• Stainless steel (ASTM A182 F316 / F304)

• Alloy steel (ASTM A182 F11 / F22)

• Duplex and Super Duplex

• Others available upon request

Pressure Taps

Each flange is supplied with two ½" NPT pressure taps as standard (one plugged).

Optional numbers and types of pressure taps are available upon request.

Sealing Faces

• Raised Face (RF)

• Ring Type Joint (RTJ)

Tap connection types: Flange Tap or Corner Tap

Dimensions and Weights (ASME B16.36)

The values are approximate and are based on a 1.5 mm gasket and standard plate thickness.

Ordering Information

The following information is required when placing an order:

• Nominal size

• Pressure class (PN / ANSI Class)

• Orifice type

• Sealing face (RF / RTJ / FF)

• Drain or vent hole requirement

• Material selection

• Pipe standard and pressure tap location

Standards

• ISO 5167-2 – Orifice Plates for Flow Measurement

• API 14.3 / AGA-3 – Natural Gas Measurement

• ASME B16.5 – Flange Face Standards

• ASME B16.36 – Orifice Flanges

• ASME B16.47 – Large Diameter Flanges

• ASME MFC-3M – Measurement of Fluid Flow Using Orifice, Nozzle, and Venturi

• ISO/TR 15377 – Special Design for Viscous Flows

Scope of Services by TLY Enerji

• Engineering and sizing calculations (ISO 5167, API 14.3, AGA-3)

• Orifice plate and flange manufacturing

• Material certification (EN 10204 3.1 / 3.2)

• Installation, testing, and field calibration

• FAT / SAT testing, documentation, and training services