Inner Vessel: Capacity Range 5,000-200,000 liters

Q: What materials are suitable for cryogenic inner vessels?

Austenitic stainless steels (304L, 316L) are most common due to excellent cryogenic toughness and corrosion resistance. Aluminum alloys (5083, 6061) are used for weight-sensitive applications. Both require certification for low-temperature service per ASTM/EN standards.

Q: How is heat transfer minimized in inner vessels?

Through vacuum insulation (typically 10-3 mbar) between inner and outer shells, supported by multilayer insulation (MLI) or perlite fill. Low-conductivity supports (stainless steel or fiberglass) minimize thermal bridges.

Q: What standards govern inner vessel manufacturing?

ISO 21029 for transportable cryogenic vessels, DIN EN 13458 for stationary tanks, and ASME Boiler & Pressure Vessel Code Section VIII for pressure containment. Additional standards include PED 2014/68/EU for European markets.

Component Specifications

Definition

The inner vessel is a critical component of cryogenic storage vessels, typically constructed as a double-walled cylindrical or spherical container. It serves as the primary containment for cryogenic liquids (such as liquid nitrogen, oxygen, or LNG) at temperatures ranging from -150°C to -196°C. This component is engineered to withstand thermal contraction, pressure differentials, and maintain vacuum insulation integrity between inner and outer shells. Key design considerations include material selection for cryogenic toughness, weld integrity, and compatibility with insulation systems like perlite or multilayer vacuum insulation.

Working Principle

Operates on principles of cryogenic containment and thermal insulation. The inner vessel maintains cryogenic liquids in a stable state by minimizing heat ingress through vacuum insulation and low-conductivity supports. It withstands thermal stresses from temperature gradients and internal pressure variations while preventing boil-off through optimized geometry and material properties.

Materials

Austenitic stainless steel (304L, 316L) or aluminum alloys (5083, 6061) for cryogenic service; Material specifications include ASTM A240/A240M for stainless steel, EN 10028-7 for pressure vessel steels, with Charpy V-notch impact testing at -196°C to ensure fracture toughness.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Capacity Range	5,000-200,000 liters
Heat Leak Rate	<0.5% per day (typical for vacuum insulation)
Surface Finish	Ra ≤ 0.8 μm for weld areas
Design Pressure	10-30 bar (varies by application)
Design Temperature	-196°C to 50°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 21029, DIN EN 13458, ASME BPVC Section VIII

Parent Products

This component is used in the following industrial products

Cryogen Storage Vessel

A specialized container designed to store cryogenic liquids at extremely low temperatures within a cryogenic injection system.

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Engineering Analysis

Risks & Mitigation

Thermal stress cracking
Vacuum integrity loss
Fatigue failure from pressure cycling
Material embrittlement at cryogenic temperatures

FMEA Triads

Trigger: Inadequate material selection or improper heat treatment
Failure: Brittle fracture at cryogenic temperatures
Mitigation: Implement material certification per ASTM A240/A240M with Charpy testing at service temperature; specify minimum impact energy requirements.

Trigger: Weld defects or insufficient NDT
Failure: Leakage or catastrophic failure under pressure
Mitigation: 100% radiographic testing (RT) or phased array UT of all welds; helium leak testing at 10-9 mbar·L/s sensitivity.

Trigger: Thermal cycling stress concentration
Failure: Fatigue cracking at support connections
Mitigation: Finite element analysis (FEA) for thermal stress optimization; use flexible bellows or sliding supports for thermal movement accommodation.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Dimensional tolerance ±0.5% of nominal diameter; Weld reinforcement ≤1.5mm; Out-of-roundness ≤1% of diameter

Test Method

Hydrostatic test at 1.3x design pressure; Helium mass spectrometry leak test; Thermal performance test per ISO 21029; Dye penetrant testing (PT) of all accessible welds

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

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Supplier transparency

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Manufacturers of Inner Vessel

Manufacturer profiles associated with Inner Vessel.

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Frequently Asked Questions

What materials are suitable for cryogenic inner vessels?