Orifice

Integral Orifice Assembly Features

• Designed for direct mounting on Differential Pressure Transmitters

• Available in sizes 15 NB to 50 NB

• Material options: Carbon Steel (C.S.) & Stainless Steel (S.S.)

• Eliminates three major measurement inaccuracies seen in small orifice line installations

• No impulse tubing required – fewer leakage points

• Reduces startup time and improves reliability

Description

An Integral Orifice Plate Assembly (IOPA) is a compact and complete flow measurement device that mounts directly to the Differential Pressure Transmitter.
It eliminates the need for external impulse piping, reducing installation complexity and minimizing potential leak points.

The assembly includes:

• Integral orifice plate

• Body

• Studs & nuts

• Gaskets

The units are available with socket weld or threaded end connections, and can also be supplied with upstream & downstream piping with flanged ends as per requirement.

Technical Specifications General

• Line Size: 15 NB to 50 NB (½” to 2” NB)

• Accuracy: ±2% of F.S.

Materials

• Orifice Plate:

  • AISI 316

  • AISI 304

  • Hastelloy C

  • Monel

  • Other materials on request

• Body Material:

  • A351-CF8M

  • A216-WCB

  • A105

  • A182-F316

• Gasket Material:

  • PTFE

Venturi Tube – Differential Pressure Flow Element Features

• Venturi design as per BS EN ISO 5167

• Construction options: Fabricated / Machined

• Available in Bi-directional & Uni-directional designs

• Flanged or Weld-in construction

• Multiple Venturi Types:

  1. Classical Venturi Tubes

  2. Venturi Nozzles

• Wide variety of material options

• No moving parts – simple, robust construction

• Maintenance-free design

Description

Electronet series Venturi Tube is the second most widely used differential pressure primary flow element.
It operates on proven Venturi flow measurement technology, contains no moving parts, and is suitable for high-temperature and high-pressure industrial applications.

Benefits of Venturi Tubes

• Low permanent pressure loss compared to orifice plates and flow nozzles

• High durability and long service life

• Minimal risk of clogging from sludge or sediment

• Ideal for applications requiring minimal pressure drop

• Superior pressure recovery:

  • Unrecovered pressure typically 10–30% of measured DP

  • Compared to 40–90% for orifice plates (depending on beta ratio)

Venturi tubes are widely used in pipelines for liquid, gas, and steam flow measurement where efficiency, reliability, and energy savings are important.

Technical Specifications Line Size Ranges

• Type A: 100–600 NB (4” – 24”)

• Type B: 50–250 NB (2” – 10”)

• Type C: 200–1200 NB (8” – 48”)

Construction Types

• Type A: Cast Convergent Section

• Type B: Machined Convergent Section

• Type C: Rough Welded Sheet-Iron Convergent Section

Accuracy

• Type A: ±0.7%

• Type B: ±1.0%

• Type C: ±1.5%