ISO/TR 11364:2019 PDF

Overview

ISO/TR 11364:2019 - Gas cylinders - Compilation of national and international valve stem/gas cylinder neck threads and their identification and marking system - is a Technical Report from ISO/TC 58 that compiles valve‑stem to cylinder‑neck threads used worldwide (current and historical) and defines a harmonized identification and marking system. The report lists taper and parallel threads, assigns official coded designations (used for marking on valves and cylinders), and gives guidance on interchangeability and recommended valving procedures to reduce mismatches and related safety incidents.

Key Topics and Requirements

• Comprehensive thread listing: Tables of national and international threads (taper and parallel) with reference numbers starting with “T” (taper) or “P” (parallel).
• Identification and marking system: Official coded designations for each thread to be used for marking valves and cylinders - simplifies identification in service and inventory.
• Interchangeability guidance: Advice on which threads are dimensionally identical and thus interchangeable; examples provided (e.g., 25E valves with T8, T23, T26), plus cautions (e.g., small steel cylinders