| Customization: | Available |
|---|---|
| Standard: | ANSI, DIN, GB, JIS, GOST, BSW, ISO |
| Type: | Stainless Steel Flange |
|
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Primary Standard: ASTM A240/A240M (Chromium/Nickel SS Plate/Sheet/Strip for Pressure Vessels)
Flange-Specific Standards:
ASME B16.5 (NPS ½"-24")
ASME B16.47 (NPS 26"-60")
EN 1092-1 (EU Flange Standard)
| Parameter | Tolerance (ASME B16.5) |
|---|---|
| OD Tolerance | ±1.5 mm (≤24") / ±3 mm (>24") |
| Bolt Hole Spacing | ±0.8 mm (≤24") / ±1.5 mm (>24") |
| Thickness | +3 mm, -1 mm |
Corrosion Resistance:
316L (Mo-added): Superior pitting resistance in chloride environments
304L (Low-C): Ideal for food/pharmaceutical industries
High-Temp Stability: 321/347 (Ti/Nb-stabilized) resist sensitization up to 800°C
Sour Service: NACE MR0175-compliant 316L/2205 for H2S environments
Chemical Composition (316L Example):
| Element | 316L Requirement |
|---|---|
| Cr | 16-18% |
| Ni | 10-14% |
| Mo | 2-3% |
| C | ≤0.03% |
Mechanical Tests:
Tensile Strength: ≥485 MPa (316L)
Hardness: ≤217 HB (Annealed Condition)
Ferrite Content: 5-15 FN (For Welding Compatibility)
Chemical Processing: Acid/alkali piping systems (316L)
Oil & Gas: Offshore platforms (Duplex 2205)
Power Plants: Steam vents (321/347)
Hygienic Packaging: PE film wrapping for food-grade 304L
Certification: EN 10204-3.1 MTC with PMI report
| Environment | Recommended Grade | Key Feature |
|---|---|---|
| General Corrosion | 304/304L | Cost-effective |
| Chloride Exposure | 316/316L | Mo-added |
| High-Temp Service | 321/347 | Ti/Nb-stabilized |
Solution Annealing: 1010-1120°C + Quench to dissolve carbides
Stress Relieving: 400-450°C for machined flanges
The pressure-temperature rating is the maximum allowable working pressure (bar unit) of the material and grade used at the rated temperature (Celsius).
Whether flange joints are used at high or low temperatures, leakage due to external forces and moments generated by the connected piping or equipment should be considered. To prevent leakage, pipe flanges and flanged fittings should avoid the application of severe external loads and sharp thermal gradients.
Application at temperatures in the creep range will result in decreasing bolt loads as relaxation of flanges, bolts, and gaskets takes place. Flanged joints subjected to thermal gradients may likewise be subject to decreasing bolt loads. Decreased bolt loads diminish the capacity of the flanged joint to sustain loads effectively without leakage. At temperatures above 200°C (400°F) for Class 150 and above 400°C (750°F) for other class designations, flanged joints may develop leakage problems unless care is taken to avoid imposing severe external loads, severe thermal gradients, or both.
Some materials, especially some carbon steel materials, exhibit a significant decrease in ductility when used at low temperatures, and thus cannot withstand impact load, sudden stress changes, and high stress concentrations. Some regulations require an impact test even when the temperature is above -29 °C (−20°F).
No pressure test is required on the flange.
Flanged fitting should be tested for shell pressure.
Shell Pressure Test for Flanged Fittings
The shell pressure test for flanged fittings shall be at a pressure no less than 1.5 times the 38°C (100°F) pressure rating rounded off to the next higher 1 bar (25 psi) increment.
|
Flanged Fittings Size |
Duration, Sec |
|---|---|
|
NPS ≤ 2 |
60 |
|
2 1/2 ≤ NPS ≤ 8 |
120 |
|
NPS ≥ 10 |
180 |
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