ASME Cold Pressing Ellipsoidal Head 2250×16 Cryogenic Tanker Dished Head

 Ellipsoidal Dished Head for Cryogenic Tanker (Cold Pressing,2250mm Inner Diameter, 8mm Thickness )

Brand Overview

Henan Guojiang is a leading domestic manufacturer specialising in precision pressure vessel components, with over 12 years of professional experience in R&D, production and customisation of dished heads. Its products are recognised by customers in more than 60 countries. In the field of cryogenic tanker components, it consistently adheres to high standards of reliability and precision to meet the rigorous operational demands of the global cryogenic transportation industry.

Core Product Specifications

· Inner Diameter: 2250mm, customised for the main tank of medium-to-large cryogenic tankers, perfectly matching the structure of tanks for storing low-temperature media such as liquid nitrogen (-196℃) and liquid oxygen (-183℃). Adopting the CNC machining process, the diameter deviation is ≤ ±0.9mm, enabling seamless connection with the tanker body and minimising assembly gaps that may cause cold loss leakage.

· Nominal Thickness: 8mm, designed based on the working pressure (0.6MPa-1.2MPa) of cryogenic tankers and the thermal expansion and contraction characteristics under ultra-low temperature. It balances structural load-bearing capacity and lightweight requirements, avoiding excessive material consumption while preventing tank deformation caused by low-temperature stress.

· Material: S30408 stainless steel (equivalent to 304 stainless steel) is selected, sourced from well-known suppliers with complete Material Test Certificates (MTC). This material contains 18% chromium and 8% nickel, which can form a stable oxide film to resist corrosion from low-temperature media; more importantly, it maintains excellent toughness in ultra-low temperature environments, effectively avoiding the risk of brittle fracture.

Manufacturing & Processing Advantages

Forming Technology: Cold Pressing

Cold pressing is the core process of this ellipsoidal dished head. For S30408 material, cold pressing can avoid high-temperature damage to the material's low-temperature mechanical properties, ensuring the head retains good ductility and weldability. 10 sets of 1000-ton hydraulic presses are used for shaping, strictly following the 2:1 major-to-minor axis ratio specified in GB/T 25198 and ASME standards. This ensures uniform stress distribution on the head surface during the transportation of low-temperature media, reducing local stress concentration.

Quality Assurance

· Inspection Protocols: A 100% full inspection is implemented for key indicators. Ultrasonic Testing (UT) is used to detect internal defects such as invisible cracks, Liquid Penetrant Testing (PT) is applied to check surface flaws, and 3D laser scanners are used to verify dimensional accuracy, ensuring each head meets the safety standards of cryogenic tankers.

· Applicable Standards: Compliant with China's GB/T 25198-2010, North America's ASME BPVC Sec.VIII Div 1, and Europe's PED 2014/68/EU, meeting the market access requirements of major global cryogenic transportation industries.

· Certifications: Holding ISO 9001:2015 Quality Management System, ISO 14001:2015 Environmental Management System certifications, and ASME "U" Stamp approval, providing solid quality assurance for cryogenic tanker applications.

Application Scenarios

As a core component of cryogenic tankers, this ellipsoidal dished head is mainly used in:

· LNG (Liquefied Natural Gas) Transport Tankers: Storing LNG at -162℃, ensuring airtightness during long-distance transportation to prevent gas leakage and energy loss.

· Industrial Cryogenic Gas Transport Tankers: Transporting liquid nitrogen, liquid oxygen, and liquid argon for industries such as metallurgy, medicine, and electronics, maintaining the low-temperature stability of media.

· Cryogenic Food Logistics Tankers: Used for ultra-low temperature transportation of frozen aquatic products and biological products, avoiding quality deterioration caused by temperature fluctuations.

Packaging & Customization

· Packaging: Single heads are packaged in export-grade fumigated wooden crates, and bulk orders use steel pallets with a load capacity of ≥1000kg. All packaging is equipped with shock-absorbing foam and waterproof membranes to prevent precision damage caused by collision or moisture during transportation.

· Customisation Services: Supports customised specifications (inner diameter: 60mm-10000mm; thickness: 1mm-300mm) to match different models of cryogenic tankers; provides free technical services including Finite Element Analysis (FEA) stress simulation for low-temperature working conditions and 2D/3D drawing design; 3-5 samples can be delivered within 20 working days for low-temperature performance testing.

After-Sales Support

· A 24-hour technical consultation hotline is available to answer questions about the installation, welding, and maintenance of the head in low-temperature environments.

· For domestic customers, on-site troubleshooting is provided within 72 hours; for overseas customers, technical support and solution guidance are offered within 5 working days.

Product Features

· Low-Temperature Resistance & Reliability: The cold-pressed structure combined with S30408 material ensures stable performance at -196℃, effectively reducing the risk of leakage and deformation during low-temperature operations.

· Hygiene & Corrosion Resistance: The surface finish reaches Ra ≤ 0.8μm, and combined with corrosion-resistant material, it meets the hygiene requirements of food and pharmaceutical-grade low-temperature transportation, avoiding media contamination.

· Cost-Efficiency: The optimised thickness design reduces material costs and tanker load, while the durable structure lowers long-term maintenance expenses.

· Global Compatibility: Compliant with international standards, it can be seamlessly integrated into the global cryogenic tanker manufacturing supply chain.