DISH END /HEAD PLATE is a critical pressure-bearing component used to seal the end of a pressure vessel or pipeline. Head Plate is also available in various geometric shapes, including elliptical, dish, conical, and flat, and is widely applied in petrochemical, energy, food,pharmaceutical, and nuclear industries. Materials include carbon steel (Q235, 16Mn), stainless steel (304, 316L, 2205), alloy steel (15CrMoV, 45CrMo), and non-ferrous metals (aluminum, titanium, copper, nickel alloys).
Key Features
Products type: Hemispherical Head,Ellipsoidal Head,Torispherical Head,Dish Only Head,Flat Bottom Head,Conical Head,Split Head,Other Head
Standards:
National Standards: GB/T 25198-2010 (Pressure Vessel Heads), GB150-2011 (Pressure Vessels), GB150-1998 (Steel Pressure Vessels).
Industry Standards: SH3408-1996 (Petrochemical), DL/T695-1999 (Power), GB/T12459-2005 (Pipe Fittings).
International Standards: ASME Section VIII, EN 13445 (European Pressure Vessel Standard).
Materials:
Carbon Steel: Q235B, Q345R, 20#, 16Mn,Q345B
Stainless Steel: 304/304L, 316/316L, 321, 347, 904L,2205 (Duplex Stainless Steel).
Alloy Steel: 15CrMoR, 14Cr1MoR, 12Cr2Mo1R
Duplex Stainless Steel: S31803 (2205), S32750 (2507)
Low-Temperature Steel: 09MnNiDR, 3.5Ni, 5Ni
Special Alloys: Titanium, Nickel-based alloys (e.g., Inconel 625, Hastelloy C-276), Clad Plates.
Dimensions:
Diameter: φ300 mm – φ8000 mm (larger sizes available upon request)
Thickness: 4 mm – 200 mm (varies based on pressure and material)
Height: Calculated based on Head Platetype and diameter (e.g., standard elliptical Head Plateh ≈ D/4)
Applications:
Industrial Equipment: Reactors, storage tanks, heat exchangers, separators.
Energy Sector: Boilers, nuclear containers, oil/gas storage tanks.
Chemical/Food: Pipeline terminal sealing, viscous medium conveying systems.
Marine/Offshore: Seawater desalination systems, offshore platform pressure vessels.
Certifications:
Classification Society Certifications: ABS, BV, DNV, LR, NK, CCS (meet offshore platform and shipbuilding requirements).
Owner/Engineering Firm Certifications: ISO 9001, API 650, ASME U-Stamp, GB/T 25198-2010.
Common Customer Questions (Q&A Format)
Q: What is the lead time for heads?
A: Typically 15–60 days, depending on order complexity (e.g., special materials, large sizes).
Q: Do you support non-standard designs (e.g., custom shapes, special angles)?
A: Yes, detailed drawings and technical requirements (e.g., pressure rating, medium properties) are required.
Q: How is welding quality ensured?
A: Welding is performed by certified welders. All welds undergo 100% radiographic testing (RT) and passivation, meeting JB/T4730.2 standards.
Q: What corrosion protection options are available?
A: Stainless steel heads provide passivation; carbon steel heads can be coated with epoxy resin or hot-dip galvanized.
Q: What is the manufacturing process for conical heads?
A: Produced via rolling (high precision, efficiency) or hydraulic pressing (for thick/special-angle designs).
Q: What inspection items are included?
A: Hydrostatic testing, radiographic testing (RT), ultrasonic testing (UT), metallurgical analysis, and chemical composition retesting.
Q: Do you provide inspection certificates (e.g., ASME U-Stamp)?
A: Yes, third-party inspection agencies (e.g., TUV, SGS) can issue inspection reports and certificates.
Q: How to select Head Platematerial?
A: Choose based on medium corrosivity, temperature, and pressure:
Low-temperature/corrosion-resistant: 304L, 316L;
High-temperature/high-pressure: 12Cr1MoV, 2205;
Cost-effective carbon steel: Q235B, 16Mn (with corrosion protection).
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