Product Parameters
| Item | Specification |
|---|---|
| Material | Gray Iron (ASTM A48), Ductile Iron (ASTM A536), Carbon Steel (WCB) |
| Size Range | 1/2" – 48" |
| Pressure Rating | Class 150 – Class 2500 |
| Face Style | Flat Face, Raised Face, Ring Type Joint |
| Application | Oil and gas, water treatment, chemical processing, power generation |
| MOQ | 5 pcs |
description
Cast pipe flanges connect piping sections and equipment with bolted joints that can be assembled and disassembled - the flange face provides the sealing surface for the gasket, and the bolt holes align with the mating flange. The casting process produces complex geometries efficiently for the wide variety of flange types used in industrial piping. Flat face flanges: the entire face is a sealing surface - used when the mating flange is also flat face, typically in low-pressure applications or with full-face gaskets. Raised face flanges: the center of the face protrudes - the most common industrial flange style. Ring type joint (RTJ): a groove in the face accepts a metal ring gasket for high-pressure and high-temperature service.
Why Flange Class and Pressure Rating Must Match
A Class 150 flange is rated for its pressure-temperature combination - at room temperature it handles more pressure than at elevated temperature. Using a Class 150 flange at the pressure its higher-temperature rating allows is a design error. The pressure rating is a function of both pressure AND temperature, not just pressure alone.
FAQ
Q1: MOQ?
A1: 5 pieces for standard cast flanges.
Q2: Size range?
A2: 1/2 inch through 48 inch diameter.
Q3: Pressure ratings?
A3: Class 150 through Class 2500.
Q4: Face styles?
A4: Flat face, raised face, ring type joint.
Q5: Materials?
A5: Gray iron (A48), ductile iron (A536), carbon steel WCB.
Q6: Standards?
A6: ANSI B16.5, B16.47, API 6A for oilfield flanges.
Quality is non-negotiable in precision manufacturing. Every component undergoes rigorous inspection at each stage of production.
- ISO 9001:2015 - Quality management system covering design and manufacturing
- API 6D / API 600 - Design and testing compliance for valve components and flanges
- Hydrostatic Pressure Testing - Every valve body pressure-tested to 1.5× rated pressure
- MPI / LPI - Magnetic particle and liquid penetrant inspection for weld integrity
- CE / ATEX - Pressure equipment directive compliance for EU market available
- Passivation / Electropolishing - ASTM A967 procedures for corrosion resistance
- Material Traceability - Heat number tracking from raw material to finished part
From raw material to finished product, every step is controlled and documented:
- Pattern Making - Wooden or metal pattern fabrication for sand/centrifugal/investment casting
- Molding - Sand casting, shell mold, centrifugal, or lost-wax investment casting setup
- Melting & Pouring - Controlled furnace melting with chemistry and temperature monitoring
- Solidification & Shakeout - Controlled cooling with riser/removal and core shakeout
- Heat Treatment - Annealing, normalizing, or solution treatment per specification
- Machining - CNC machining, drilling, and tapping to final dimensions
- Surface Treatment - Grinding, welding, or coating as required
- Inspection & Testing - Dimensional, visual, hydrostatic, or NDT inspection
- Cleaning & Packaging - Sand removal, degreasing, rust prevention, and packaging
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