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Stainless steel orifice flanges are vital parts of an industrial piping system where flow precision is needed. They are more typically used in oil and gas fields, refineries, chemical plants, offshore platforms, power plants and water treatment facilities and are specifically designed to accommodate an orifice plate between two flanges that fit together. Access to an accurate Stainless Steel Orifice Flanges weight chart is essential to system design and logistics planning as well as estimating costs to the engineer, procurement manager, and the EPC contractors.
The following guide is a very detailed explanation of stainless steel orifice flanges and includes three large reference tables with the larger classes of pressure. The data may be applied as a direct Stainless Steel Orifice Flanges weight chart in kg, or may be transformed into a Stainless steel orifice flanges weight chart in PDF which may serve as technical documentation.
Understanding Stainless Steel Orifice Flanges
Orifice flanges are also different compared to a normal weld neck or slip-on flange because they have holes of pressure taps. These taps are linked up to differential pressure transmitters which determine the pressure drop across an orifice plate to enable fluid flow rate to be accurately calculated.
Orifice flanges are made with stainless steel due to:
- High corrosion resistance
- Superior mechanical strength.
- Prolonged operation in adverse conditions.
- High-temperature and high-pressure compatibility Triple service compatibility
Common standards of manufacturing are ASME B16.36, ASME B16.5, and the specifications of the customer.
Common Stainless Steel Grades Used
The weight of orifice flanges can slightly vary depending on material grade. Common grades include:
- ASTM A182 F304 / F304L – General-purpose corrosion resistance
- ASTM A182 F316 / F316L – Superior resistance to chlorides and chemicals
- Duplex & Super Duplex Stainless Steel – High strength and excellent resistance to stress corrosion cracking
While the density difference between these grades is minimal, accurate weight charts are still required for load calculations.
Importance of Stainless Steel Orifice Flanges Weight Chart
A reliable Stainless Steel Orifice Flanges weight chart in kg is important for multiple reasons:
- Pipeline stress analysis and support design
- Transportation and lifting calculations
- Installation planning and manpower estimation
- Costing and budgeting during procurement
- Preparation of GA drawings and MTOs
Many project teams prefer sharing standardized data in the form of a Stainless Steel Orifice Flanges weight chart in pdf to avoid discrepancies across departments.
Stainless Steel Orifice Flanges Weight Chart – Class 150
Class 150 orifice flanges are commonly used in low-pressure and moderate-temperature applications such as water lines, utility services, and low-pressure process piping.
| Nominal Pipe Size (NB) | Outside Diameter (mm) | Thickness (mm) | Approx. Weight (kg / pair) |
| ½” | 89 | 14 | 4.5 |
| 1” | 108 | 16 | 6.8 |
| 2” | 152 | 18 | 11.5 |
| 3” | 191 | 20 | 18.0 |
| 4” | 229 | 22 | 25.5 |
| 6” | 279 | 24 | 39.0 |
| 8” | 343 | 26 | 62.0 |
| 10” | 406 | 28 | 88.0 |
| 12” | 483 | 30 | 120.0 |
This table is widely referenced as a Stainless Steel Orifice Flanges weight chart in kg for general industrial use.
Stainless Steel Orifice Flanges Weight Chart – Class 300
Class 300 stainless steel orifice flanges are suitable for higher pressure services and more demanding operating conditions.
| Nominal Pipe Size (NB) | Outside Diameter (mm) | Thickness (mm) | Approx. Weight (kg / pair) |
| ½” | 95 | 18 | 6.2 |
| 1” | 124 | 20 | 9.5 |
| 2” | 165 | 24 | 16.8 |
| 3” | 210 | 28 | 26.5 |
| 4” | 254 | 30 | 37.0 |
| 6” | 318 | 34 | 58.5 |
| 8” | 381 | 38 | 89.0 |
| 10” | 445 | 42 | 125.0 |
| 12” | 521 | 46 | 170.0 |
This data is commonly shared internally as a Stainless Steel Orifice Flanges weight chart in pdf for EPC and fabrication teams.
Stainless Steel Orifice Flanges Weight Chart – Class 600
Class 600 orifice flanges are designed for high-pressure and high-temperature applications, including steam lines, hydrocarbon processing, and critical process services.
| Nominal Pipe Size (NB) | Outside Diameter (mm) | Thickness (mm) | Approx. Weight (kg / pair) |
| ½” | 95 | 22 | 8.0 |
| 1” | 133 | 26 | 12.5 |
| 2” | 178 | 32 | 22.0 |
| 3” | 229 | 36 | 35.5 |
| 4” | 273 | 40 | 49.0 |
| 6” | 356 | 46 | 78.0 |
| 8” | 419 | 52 | 118.0 |
| 10” | 508 | 58 | 165.0 |
| 12” | 559 | 62 | 215.0 |
This completes a comprehensive Stainless Steel Orifice Flanges weight chart for high-duty services.
Additional Buyer & Engineering Considerations
When using a Stainless Steel Orifice Flanges weight chart in kg, buyers should also consider:
- Type of pressure taps (flange taps, corner taps, radius taps)
- Compatibility with orifice plate thickness
- Surface finish and facing (RF, RTJ)
- Compliance with project-specific codes and client approvals
Weight charts should always be used in conjunction with dimensional drawings for final verification.
Conclusion
A well-documented Stainless Steel Orifice Flanges weight chart is a vital reference for engineers, designers, and procurement professionals. Whether used internally or shared as a Stainless Steel Orifice Flanges weight chart in pdf, accurate weight data ensures safer installations, optimized logistics, and smoother project execution.