🔧 ISO 9809 and ISO 11120 – Seamless Steel Gas Cylinders
Here's a clear explanation of ISO 9809 and ISO 11120, both of which are international standards for seamless steel gas cylinders, but apply to different types and uses:
✅ Full Title:
ISO 9809-1/2/3 – Gas cylinders — Refillable seamless steel gas cylinders — Design, construction and testing
📌 Scope:
- Applies to seamless steel cylinders for permanent and liquefied gases.
- Covers cylinders typically with water capacity up to 150 litres.
- Commonly used for industrial gases (oxygen, nitrogen, argon, etc.).
📂 Parts:
- ISO 9809-1: Cylinders made of normalized steel.
- ISO 9809-2: Cylinders made of quenched and tempered steel.
- ISO 9809-3: Cylinders made of normalized or quenched and tempered steel, using a different set of test requirements.
🔍 Covers:
- Material requirements
- Manufacturing processes (e.g., hot drawing, forging)
- Design criteria (wall thickness, stress limits)
- Tests: hydrostatic, burst, tensile, impact, and ultrasonic
- Marking and inspection
🚀 ISO 11120 – Seamless Steel Tubes for High-Pressure Gases
✅ Full Title:
ISO 11120 – Gas cylinders — Refillable seamless steel tubes of water capacity between 150 L and 3000 L — Design, construction and testing
📌 Scope:
- Applies to large seamless steel tubes (often called cylinder tubes or MEGC tubes).
- Water capacity between 150 litres and 3000 litres.
- Common in bulk gas transport systems, e.g., tube trailers and ISO containers.
🔍 Covers:
- Design methodology for thick-walled, large-capacity gas containment.
- Material standards (usually quenched and tempered alloy steels).
- Non-destructive testing (NDT) requirements.
- Testing: hydrostatic, burst, ultrasonic, radiographic.
- Tolerances and markings.
🔄 Key Differences: ISO 9809 vs ISO 11120
|
Feature
|
ISO 9809
|
ISO 11120
|
|
Capacity
|
≤ 150 L
|
150–3000 L
|
|
Use
|
Standard cylinders (welding, industrial gases)
|
Bulk storage/transport (tube trailers, ISO skids)
|
|
Material
|
Normalized or quenched & tempered steel
|
Quenched & tempered high-strength steel
|
|
Application
|
Portable gas cylinders
|
High-capacity transport tubes
|
|
Standards Parts
|
3 parts (based on steel type)
|
Single comprehensive standard
|
***
9911796707
