High-performance Dished Ends For Corrosion Resistance In Petrochemical And Industrial Systems
"fond bombé" is a french term meaning convex bottom or rounded end, and in an industrial context, it refers to a type of pipe end cap or closure that is hemispherical, oval, or round to seal the end of a pipe.
High-performance Dished Ends For Corrosion Resistance In Petrochemical And Industrial Systems
"fond bombé" is a french term meaning convex bottom or rounded end, and in an industrial context, it refers to a type of pipe end cap or closure that is hemispherical, oval, or round to seal the end of a pipe. these caps are made from a single piece of steel to provide a strong, seamless, and pressure-tight seal for pipes used in various industries like construction, chemical, and shipbuilding.
Les désignations d’un fond bombé sont nombreuses : fond de cuve, fond à souder, fond bombé, fond embouti, caps, fond de tube… et elles peuvent varier en fonction de leur application.
Fond bombé, or dished heads, are critical components used to seal pressure vessels, boilers, and large-diameter pipelines, providing exceptional corrosion resistance and structural integrity. Available in hemispherical, elliptical (2:1 ratio), and torispherical (Klopper) configurations, these heads are vital for boiler pipeline protection and erosion/corrosion resistance in industries such as petrochemical, power generation, chemical processing, and oil and gas.
Compliant with standards like DIN 28011 (torispherical), DIN 28013 (hemispherical), ASME UG-32, and EN 13445, fond bombé are available in sizes up to 72″ (DN1800), with wall thicknesses up to 200 mm. They are manufactured from materials such as carbon steel (HII, P265GH), stainless steel (304, 316L, 1.4541, 1.4571), or alloy steel (15Mo3, 13CrMo44, 10CrMo910). Surface treatments like pickling, passivation, or Fusion Bonded Epoxy (FBE) coatings enhance durability in corrosive environments.
Fond bombé undergo rigorous testing, including chemical analysis (e.g., HII: C ≤0.16%; 316L: C ≤0.03%), tensile testing (HII: YS ≥235 MPa, TS ≥360-510 MPa; 316L: YS ≥205 MPa, TS ≥515 MPa), hydrostatic testing (up to 9.8 MPa), and nondestructive methods (radiographic, ultrasonic, PMI). With a density of ~7.85 g/cm³ for carbon steel or ~8.0 g/cm³ for stainless steel, and suitability for temperatures up to 450°C (carbon steel) or 870°C (stainless steel), these heads excel in high-pressure vessel applications like boilers, heat exchangers, and refinery systems.
The versatile designs (hemispherical for high-pressure, elliptical for stress distribution, torispherical for cost-effectiveness) make fond bombé ideal for sealing pressure vessels in harsh, corrosive settings, such as chemical plants, offshore platforms, and power generation facilities.
| Specification | Details |
|---|---|
| Standards | DIN 28011 (Torispherical), DIN 28013 (Hemispherical), ASME UG-32, EN 13445 |
| Type | Hemispherical, Elliptical (2:1), Torispherical (Klopper), Welded or Seamless |
| Material | Carbon Steel (HII, P265GH), Stainless Steel (304, 316L, 1.4541, 1.4571), Alloy Steel (15Mo3, 13CrMo44, 10CrMo910) |
| Size Range | Up to 72″ (DN1800) |
| Wall Thickness | Up to 200 mm |
| Manufacturing | Cold Pressing, Hot Forming, Welded Fabrication |
| Surface Treatment | Pickling, Passivation, FBE, 3LPE |
| Testing | Chemical Analysis (HII: C ≤0.16%; 316L: C ≤0.03%), Tensile (HII: YS ≥235 MPa, TS ≥360-510 MPa; 316L: YS ≥205 MPa, TS ≥515 MPa), Hydrostatic (≥9.8 MPa), Radiographic, Ultrasonic, PMI |
| Operating Conditions | Pressure: ≥9.8 MPa, Temperature: Up to 450°C (carbon steel), 870°C (stainless steel) |
| Certifications | EN 10204/3.1, ISO 9001, ASME U-Stamp, Third-Party Inspection |
Fond bombé 88.9 noir
"Fond bombé" désigne un fond arrondi ou bombé. C'est un terme utilisé généralement dans le contexte des récipients ou des objets dont le fond est incurvé.
r1 = Da
r2 = 0.1 x Da
h1 ≥ 3.5 x s
h2 = 0.1935 x Da-0.455 x s / s = épaisseur nominale
h3 = h1 + h2 / * Da = Do = D
V (calotte) ≈ 0.1 x (Da – 2 x s)³ sans bord h1
Aa (surface externe) ≈ 0.99 x Da² sans bord h1
Ai (surface interne) ≈ 0.99 x (Da - 2 x s)² sans bord h1
| Feature | Fond Bombé (Dished Head) | Elliptical Head (2:1) | DIN 2617 Pipe Cap |
|---|---|---|---|
| Material | Carbon Steel (HII, P265GH), Stainless Steel (304, 316L), Alloy Steel (15Mo3, 13CrMo44) | Carbon Steel (HII, P265GH), Stainless Steel (304, 316L), Alloy Steel (15Mo3, 13CrMo44) | Carbon Steel (HII, P235GH), Stainless Steel (1.4541, 1.4571) |
| Standard | DIN 28011, DIN 28013, ASME UG-32, EN 13445 | DIN 28011, ASME UG-32, EN 13445 | DIN 2617, EN 10253 |
| Function | Seals pressure vessels, versatile designs (hemispherical, elliptical, torispherical) | Seals pressure vessels, optimizes stress distribution | Seals pipe ends, protects against corrosion |
| Corrosion Resistance | Excellent (stainless steel), Good (carbon steel with coatings) | Excellent (stainless steel), Good (carbon steel with coatings) | Good (with coatings) |
| Erosion Resistance | Excellent (hemispherical), Good (elliptical, torispherical) | Excellent (static application) | Good (static application) |
| Applications | Pressure vessels, boilers, petrochemical | Pressure vessels, boilers, petrochemical | Boilers, petrochemical, chemical processing |
| Temperature Range | Up to 450°C (carbon steel), 870°C (stainless steel) | Up to 450°C (carbon steel), 870°C (stainless steel) | Up to 450°C (carbon steel) |
| Cost | Varies (hemispherical: high; torispherical: low) | Moderate to High | Moderate |
| Key Advantage | Versatile designs for vessels | Optimal stress distribution | Butt-welded for pipe sealing |
| Feature | Ellipsoidal Head | Torispherical Head |
|---|---|---|
| Curvature | Continuous & smooth | Discontinuous at knuckle |
| Stress Distribution | Even and efficient | Concentrated at knuckle |
| Wall Thickness Required | ≈ shell thickness | ≈ 1.77 × shell thickness |
| Manufacturing Complexity | Moderate to high | Lower, simpler |
| Vessel Height | Deeper profile | Shallower profile |
| Best Use | Medium to high pressure | Low to medium pressure |
| Cost & Material Use | Higher | Lower |
A curated list of long-tail keywords for fond bombé (dished heads), covering standards, materials, and industrial applications.
Note: Fond bombé (dished heads) are designed for corrosion-resistant, high-pressure sealing in pressure vessels and industrial systems. Contact a certified supplier for detailed specifications.
Standards: ASME B16.9 and ASME B16.25
Description: Designed for butt welding to pipe end, providing permanent and strong connection.
Standards: ASME B16.11
Description: Fit into socket of pipe fitting and welded in place.
Thread Types: NPT and BSP configurations
Description: Feature internal or external threads for screwing onto threaded pipe ends.
Features: Flange, slotted head, knurled or faceted head options
Considerations: Length and width dimensions are critical
Design: Dome-shaped for optimal pressure distribution
Pipeline terminations, wellhead applications, refinery piping
Process piping systems, chemical storage and handling
Steam and water systems, cooling circuits, fuel handling
Building services piping, HVAC systems, fire protection
Ship piping systems, offshore installations, marine equipment
Hygienic piping systems, processing equipment, sterile systems
An elliptical head is defined as a component in pr...
A torispherical head is a common, cost-effective p...
Large size caps are used for connecting pipes of d...
We offer all sa234 wpb pipe caps at really low pri...
Din 2617 is a german standard for butt-weld pipe c...
Ansi/asme b16.9 pipe end caps are buttwelding fitt...
