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Designs of Seamless Steel Gas Cylinders: Structural Aspects

The design of seamless steel gas cylinders requires a number of key structural considerations to ensure their safety and reliability. The following are some of the key considerations in the structural design of seamless steel cylinders:

Material Selection:

Cylinder materials shall be made of non-ageing sedentary steel smelted in alkaline flat furnaces, electric furnaces, or oxygen-blowing alkaline converters.

The steel grade for manufacturing cylinders must be identified and recognized by the relevant national or international authorities, and should be selected from high-quality manganese steel, chromium-molybdenum steel or other alloy steels.

Cylinder material should have good impact properties to withstand possible impact and pressure changes

Design stress factor:

The design stress factor (F-value) shall be determined by the heat treatment of the cylinder, e.g., 0.82 for cylinders designed for normalizing or tempering after normalizing and 0.77 for cylinders designed for tempering after quenching.

Wall thickness design:

The wall thickness of the cylinder should be designed and calculated based on the hydraulic test pressure to ensure that no rupture occurs under the specified pressure.

The yield stress selected for design calculation should be in accordance with the relevant standards, for normalized or normalized tempered cylinders, the yield stress should not be greater than 75% of the minimum tensile strength; for quenched and tempered cylinders, the yield stress should not be greater than 85% of the minimum tensile strength

Bottom structure:

The structure of convex and concave bottoms should meet specific design requirements, e.g., the structure of convex bottoms should meet conditions such as r ≥ 0.075 D₀; H/D₀ ≥ 0.22 or H/D₀ ≥ 0.40

Cyclic pressurization fatigue test:

Cylinders shall be designed to undergo a cyclic pressurization fatigue test to ensure that fatigue damage does not occur at the specified number of cycles.

Safety features:

The thickness of the mouth of the bottle shall meet specific requirements to ensure that no leakage or damage occurs during filling and use.

Cylinders shall be clearly and permanently marked, including cylinder volume, working pressure, test pressure, container weight, wall thickness, date of shipment, date of inspection and testing, inspection marking, and shipment number

Environmental adaptability:

Cylinders should be able to be used within the specified ambient temperature range, e.g. -20~60℃ for general areas and -40~60℃ for cold areas.

Manufacturing and inspection:

The manufacture of cylinders shall be in accordance with the provisions of relevant national standards or industry standards, and there is a certificate of quality conformity.

The manufacturing plant shall carry out all verification and analysis according to the furnace tank number to ensure product quality

In summary, the structural design of seamless steel gas cylinders is a complex process that requires comprehensive consideration of a number of aspects, such as material properties, design stress, wall thickness, bottom structure, safety features, environmental adaptability, and manufacturing and inspection standards. By complying with these design and manufacturing standards, the safety and reliability of gas cylinders in use can be ensured.

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