fitting end cap
fitting end cap
fitting end cap
fitting end cap
fitting end cap

Stainless Steel Dome Fitting Butt-weld End Cap

JN-FT-239002-4
Size: DN15 – DN150 (1″ – 6″, O.D. Φ12.7 – Φ152.4)
Grade: Manufactured from high-quality stainless steel SUS304 or SUS316L, offering excellent corrosion resistance and durability
Standard: Conforms to ISO, DIN, IDF, SMS, 3A, and other internationally recognized sanitary standards
Working Pressure: 1.0 MPa (PN10 bar)
Test Pressure:
Shell hydrostatic test: 2.4 MPa
Seal integrity test: 1.8 MPa
Temperature Range: -10℃ to +150℃ (steam sterilization up to 150℃ for max 20 min)
Thread Type: Available in BSP, NPT, or metric threads to suit various piping connections
Sealing: Standard PTFE gaskets provide excellent corrosion resistance, low friction coefficient, and broad temperature adaptability for long-term reliable sealing; optional Viton (FPM) O-rings are available for applications involving high temperatures, oils, or aggressive chemical media
Surface Finish: Bright annealed or electro-polished finish for improved hygiene and corrosion resistance
Quantity:
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Stainless Steel Dome Fitting Butt-weld End Cap
 

The stainless steel Dome End Capis manufactured using thickened 304/316L stainless steel plates through CNC integrated spinning forming technology. The entire inner and outer surfaces undergo electrolytic mirror polishing treatment. The product adopts a standard 2:1 elliptical curved structure combined with an extended straight-edge welding section, featuring no splice welds, no concave-convex dead corners, and no material retention areas.

The stainless steel fitting end cap strictly complies with ISO2852, 3A, and DIN sanitary equipment standards. It can withstand 121°C high-temperature SIP (Steam-In-Place) sterilization and acid/alkali CIP (Clean-In-Place) cleaning processes. The smooth curved surface transition eliminates material retention gaps and meets GMP and FDA food-contact safety requirements.

It is mainly welded and assembled at both ends of fermentation tanks, mixing reaction tanks, storage tanks, and heat exchangers. As a pressure-sealing component at the tank end, the stainless steel thread cap provides three core functions: pressure-bearing safety, hygienic easy cleaning, and complete medium drainage. It is a standard end component for sterile pressure vessels used in food, pharmaceutical, biotechnology, and daily chemical industries.

 

Accessories

 Component & Material Table
  • Head Body & Straight Flange: 304/316L stainless steel (sanitary-grade cold-stamped or forged; duplex steel or titanium alloy options available)
  • Surface Finish: Brushed matte exterior; electropolished mirror finish on both interior and exterior (Ra ≤ 0.4μm, down to 0.2μm); anti-corrosion pickling and passivation
  • Reinforced Thickness: 2–16mm heavy-gauge plate, suitable for atmospheric, medium, or moderately high-pressure operating conditions
  • Structural Accessories: Extended welded straight flange; integrated extended shell section; heavy-duty head for vacuum service; non-standard beveled head; specialized curved head for bottom drainage
Product Parameter Details
  • Material:Main body made of 304 stainless steel (for ambient-temperature, atmospheric-pressure storage tanks for beverages, dairy, or purified water) or 316L stainless steel (for pharmaceutical mild-acid applications, coastal high-chloride environments, or highly corrosive fermentation tanks); duplex steel or titanium alloys available upon request; material certification provided.
  • Standard Specifications: Full range of elliptical sizes from DN100 to DN3000, compliant with GB, ASME, and DIN standards; supports non-standard customization of diameter, wall thickness, and extended straight-flange lengths (up to 300mm).
  • Surface Treatment: Brushed matte exterior finish; interior and exterior electropolished to a mirror finish (Ra ≤ 0.4μm, with ≤ 0.2μm optional); pickling and passivation treatment; includes Blue Spot Test and roughness measurement reports; salt spray test resistance ≥ 720 hours.
  • Thickness Customization: Thickness range of 2–16mm; wall thickness verification calculations performed based on specific operating conditions (atmospheric, medium, or slightly high pressure); strength calculation reports provided (compliant with GB 150 or ASME).
  • Structural Customization: Options include extended weldable straight flanges, integrated extended shell sections, thickened heads for vacuum applications, non-standard beveled heads, and curved heads designed for bottom drainage; pre-fabrication of ports for manways, sight glasses, and instrumentation available to meet specific process requirements.
  • Certification Grade: Compliant with FDA and 3A sanitary standards; pressure vessel certification (CE/ISO) available; each unit undergoes a hydrostatic test at 1.5 times the design pressure before shipment.
  • Installation & Connection: Suitable for direct butt-welding to the vessel shell (beveling provided) or connection via welded flanges or sanitary clamps; no directional restrictions for installation (though downward-facing drainage ports are recommended); on-site installation guidance services available.

Digital advantages

1. Standardized Specification Database for Fast Model Selection and Quotation

2. Compatible with GMP Traceability Management Systems in Clean Workshops

3. Standard Specifications Support Enterprise Inventory Digital Management

4. Compatible with Automated Sterile Production Line Upgrades and Renovations

5. Full Life-Cycle Digital Operation and Maintenance Management

 
Stainless Steel Dome Fitting Butt-weld End Cap
 
Feature (F)、Advantage (A)、Benefit (B)
 
1.  Pressure-bearing ellipsoidal head
F:  Thickened spun construction, 2:1 semi-ellipsoidal shape, extended straight flange.
A:  Uniform stress distribution; withstands positive/negative pressure and 121° C steam without.
deformation.
B:Prevents leakage, reduces maintenance, and extends service life.
2.  Mirror-finish polishing
F:One-piece formed, electropolished (Ra  0.4), smooth corner transitions.
A: Residue-free cleaning, no dead zones, thorough sterilization.
B: GMP compliant; prevents spoilage from residue; reduces rework.
3.Extended straight flange
F: Integral straight flange, pre-beveled edge, smooth transition.
A: Easy welding alignment, excellent forming quality, compatible with various wall thicknesses.
B: Shortens lead times, lowers labor costs, improves efficiency.
4. Diverse materials and specifications
F: 304/316L grades; full size range; 2 - 16mm thickness; custom. 
A:Options for ambient-temperature thin sheets or thickened versions for
high-temperature/acidic applications; fits various tank types.
B:Covers all process requirements; simplifies selection; compatible with complete systems.
5.Seamless and corrosion-resistant
F:  Integrally flow-formed (seamless); pickled and passivated.
A: Resistant to pitting and crevice corrosion; stable at high temperatures; no ion leaching.
B: Reduces maintenance, prevents contamination, and ensures quality.
 
 
Stainless Steel Dome Fitting Butt-weld End Cap
 
Molding Process：CNC integrated spinning forming, seamless integrated structure
Standard Elliptical Ratio：2:1 standard sanitary elliptical structure
Wall Thickness：2 mm-16 mm customizable thickened plate
Welding Structure：Extended straight edge for welding, prefabricated welding bevel
Matching Standard：ISO2852, 3A, DIN sanitary equipment standards
Applicable Temperature：-20°C to 150°C (supports 121°C SIP high-temperature steam
Standard Sizes：DN100-DN3000 standard sizes, customized sizes available
 
 
 
 
 
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