orifice flange

orifice flange

Orifice flanges are used with orifice plates to measure the flow of fluids in pipelines. LOCUS orifice flanges are designed for precise differential pressure measurement. These flanges come with jack screws to facilitate easy removal of the orifice plate. They are widely used in process industries for flow measurement and control.

Brand: LOCUS
Material: SS304, SS316, Carbon Steel, Alloy Steel
Pressure Rating: ANSI 150#, 300#, 600#, 900#
Flange Type: Weld Neck, Slip-On, Threaded
Orifice Plate Type: Concentric, Eccentric, Segmental
Standard Compliance: ASME B16.36, B16.5, API, ISO
Sizes Available: 1/2″ to 24″ (Custom sizes on request)
End Connections: RF (Raised Face), RTJ (Ring Type Joint)

Description

1. Description

2. Specification

Brand: LOCUS
Type: Weld Neck / Slip-On / Threaded
Pressure Rating: ANSI 150# to 900#
Material: SS304, SS316, CS, AS
Flange Faces: RF / RTJ
Plate Type: Concentric / Eccentric / Segmental
Bolt Holes: Per ASME B16.5 Standards
Jack Screws: Provided for easy removal

3. Working

An orifice flange works with an orifice plate inserted between two flanges. As fluid passes through the orifice plate, a pressure drop occurs. This differential pressure is used to calculate the flow rate of the fluid. Pressure taps (tappings) are provided on the flanges to connect differential pressure transmitters.

4. Principle

The orifice flange set operates on Bernoulli’s Principle, where the drop in pressure across a constriction (orifice) in the flow path is proportional to the square of the flow rate. This allows for accurate calculation of fluid flow.

5. Assembly

Place the orifice plate between the two flanges.
Ensure the pressure tap holes align with the orifice bore.
Insert gaskets on both sides of the orifice plate.
Bolt the flanges together.
Connect the differential pressure transmitter to the taps.
Tighten jack screws as required.

6. Installation Process

Clean pipe ends before installation.
Position the orifice flange set on the pipeline.
Use appropriate gaskets and ensure alignment.
Install bolts and tighten in a cross pattern.
Connect impulse lines to pressure taps.
Verify zero leakage and pressure drop.

7. Technical Specification

Operating Pressure: Up to 2500 psi (Depending on rating)
Operating Temperature: Up to 450°C
Accuracy: ±0.5% (Depending on transmitter)
Standard: ASME B16.36 / B16.5
Plate Bore Tolerance: ±0.25%
Flange Thickness: As per ASME standard

8. Troubleshooting

Problem	Cause	Solution
Inaccurate flow reading	Plate misalignment or dirt blockage	Clean or re-align orifice plate
Leakage at joints	Improper gasket or bolt tightening	Replace gasket and tighten bolts
Pressure tap blockage	Debris or clogging	Clean or flush impulse lines
Corrosion or material damage	Incompatible fluid	Use correct material grade

9. HS Code

HS Code (India): 73072100
Description: Flanges of Stainless Steel for Pipes or Tubes

10. FAQ

Q1. What is the function of an orifice flange?
A1. It is used to measure fluid flow rate through differential pressure.

Q2. Can I use LOCUS orifice flanges for steam service?
A2. Yes, with the appropriate material grade and pressure rating.

Q3. Are custom bore sizes available?
A3. Yes, we offer tailor-made bores as per client process data.

Q4. Do you provide material test certificates?
A4. Yes, MTCs as per EN 10204 3.1 are provided.

11. Applications

Oil & Gas Industry
Petrochemical Plants
Power Generation
Water & Wastewater Management
HVAC Systems
Steam and Utility Piping Systems

Manufactured By:
LOCUS INTERNATIONAL EXPORTS
An ISO 9001:2015 & CE Certified Export Unit
GSTIN: Registered
IEC: 00072194AM25
MSME: Registered (Micro)
Trademark: LOCUS (Class 7)