Our Process

Step-by-step quality checks ensuring precision and reliability.

Sourcing of Forged Raw Flanges

• Forged flange blanks are sourced from approved forging partners.

• Raw material is procured as per required ASTM material grades (e.g., A105, A350 LF2, A182 F304/F316).

• Each forging batch is supplied with Mill Test Certificate (MTC).

• Heat number identification is maintained for full traceability.

Incoming Raw Material Inspection

Before machining, the forged blanks undergo:

• Visual inspection for cracks and surface defects

• Dimensional verification (OD, ID, thickness, hub dimensions)

• Heat number verification

• MTC review and documentation

• Optional PMI testing (if project-required)

• Only approved materials move to machining stage.

Forged blanks are machined as per ASME B16.5 dimensional standards.

Typical operations include:

• Facing operation

• OD turning

• Bore machining

• Hub profiling (for Weld Neck flanges)

• Step machining

• Drilling of bolt holes as per PCD

• Chamfering

All machining is performed to achieve required tolerances and surface finish.

CNC Machining Operations

Drilling & PCD Accuracy Control

• Bolt holes are drilled as per specified Pitch Circle Diameter (PCD).

• Angular spacing is maintained precisely.

• Go/No-Go gauges and calibrated measuring tools are used.

• Hole alignment and perpendicularity are checked.

Drilling Facing Finish (RF / RTJ )

Depending on order specification:

• Raised Face (RF) machining

• Ring Type Joint (RTJ) groove machining

• Surface finish maintained as per ASME requirements

• Serration finish checked using surface roughness gauge

Dimensional Inspection

Each batch undergoes detailed inspection including:

• OD, ID, thickness verification

• Bolt hole diameter and PCD check

• Hub dimensions and taper angle verification

• Height and step measurements

• Surface finish verification

Inspection is performed using calibrated Vernier, micrometers, height gauges, bore gauges, and templates.

PMI & Additional Testing (If Required)

Depending on project requirement:

• Positive Material Identification (PMI)

• Hardness testing

• Hydrostatic testing

• Third-party inspection

All test records are documented.

Marking & Traceability

Each flange is marked with:

• Size

• Pressure class

• Material grade

• Heat number

• Manufacturer identification

Traceability is maintained from raw forging to finished flange.

Surface Protection & Finishing

• Deburring

• Anti-rust oil application (for carbon steel)

• Protective plastic covers for flange faces

• Rust preventive coating if required