expander flange

1. Description

Expander flanges are a specialty flange used to increase the pipe size at the flange connection. LOCUS Expander Flanges eliminate the need for a separate reducer and flange combination, simplifying the piping layout. Designed for high-integrity, pressure-rated pipelines in various industries including oil & gas, power plants, and water treatment.

2. Specification

3. Working

The Expander Flange is installed where the line size changes from a smaller pipe to a larger one. It provides a safe and leak-proof connection and absorbs mechanical stress caused by changes in pressure or thermal expansion. It works under the same principle as a reducer + flange but in one integrated piece.

4. Principle

Based on the mechanical expansion principle, the flange bore is tapered or bored to accommodate a larger pipe size, allowing smooth flow transition while maintaining pressure integrity and structural strength. Ensures minimal turbulence and pressure loss.

5. Assembly

1. 1. Align the expander flange with the connecting pipe flange.
   2. Use appropriate gaskets and bolting as per flange face type.
   3. Weld or bolt the expander flange to the connecting pipeline.
   4. Torque the bolts as per ASME/ANSI bolt torque chart.
   5. Hydrostatic pressure test recommended post-assembly.

6. Installation Process

Tools Required: Torque wrench, flange alignment tool, gasket, bolt & nut set
Process:

1. 1. Clean both flange faces before assembly.
   2. Insert the gasket between the flange faces.
   3. Align bolt holes and insert bolts.
   4. Tighten bolts in a star pattern to avoid stress concentration.
   5. Check for leaks via hydro test.
   6. Apply anti-corrosion coating if applicable.

7. Technical Specification

8. Troubleshooting

9. HS Code (Export Tariff Code)

HS Code: 73072100
Description: Flanges of Iron or Steel (excluding stainless)
Alternate HS Codes (for Stainless Steel): 73072200

10. Frequently Asked Questions (FAQ)

Q1: Can Expander Flanges handle high pressure?
👉 Yes, LOCUS Expander Flanges are available up to Class 2500 pressure rating.

Q2: What is the difference between Expander Flange and Reducer + Flange?
👉 Expander Flange combines both in one body, saving space and reducing leak points.

Q3: Are custom bore sizes available?
👉 Yes, LOCUS offers bore customization to match client piping systems.

Q4: What certifications are available?
👉 ISO 9001:2015, CE Marking, Material Test Certificate (MTC 3.1), etc.

Q5: Are Expander Flanges suitable for chemical pipelines?
👉 Yes, stainless steel or coated versions are ideal for corrosive applications.

11. Applications

Brand Highlights – LOCUS

• •  Trademark Registered (No: 4443632, Class 7)
  •  ISO 9001:2015 Certified
  •  CE Certified Products
  •  MSME Registered (Micro)
  •  GST & IEC Code Available
  •  OEM / White Label Services Available