CGA P-15-2022 PDF

Full title and description

CGA P-15-2022 — Standard for the Filling of Nonflammable Compressed Gas Cylinders. This standard provides recommended industry practices and precautionary measures for the filling of selected liquefied and nonliquefied, nonflammable industrial, medical and food gas cylinders (up to 125 lb / 57 kg water capacity), and identifies cylinder types, gases, and filling practices to help ensure safe filling operations.

Abstract

This standard describes safe and recommended procedures for filling certain nonflammable compressed gas cylinders, including scope limits by cylinder specification and gas type, prefill inspection criteria, and precautions to prevent contamination, overpressure, and other hazards. It clarifies which cylinder types and gases are covered and lists operations and cylinder types that are outside its scope (for which other CGA publications or regulations apply).

General information

• Status: Current.
• Publication date: June 7, 2022 (edition published 2022).
• Publisher: Compressed Gas Association (CGA).
• ICS / categories: 23.020.35 (Gas cylinders) — Fluid storage devices / gas cylinders.
• Edition / version: Sixth edition (2022), revising CGA P-15-2016.
• Number of pages: 32 pages (typical published PDF/print length).

Scope

Covers recommended practices and precautionary measures for filling certain liquefied and nonliquefied, nonflammable industrial, medical and food gas cylinders not exceeding 125 lb (57 kg) water capacity. Applies to DOT 3A, 3AA, 3AL, TC 3AM, 3AAM, 3ALM, their authorized UN equivalents, and applicable composite cylinders when filled with air, argon, carbon dioxide, helium, nitrogen, nitrous oxide and oxygen. The standard explicitly excludes equipment design specifications for filling systems, automated or palletized filling operations, clustered/bundled cylinder filling, insulated refrigerated/cryogenic liquid cylinders (e.g., DOT 4L), transfilling between high‑pressure or liquefied cylinders, gas mixtures, and flammable or specialty/liquefied petroleum gases that require additional procedures. Users should consult other CGA publications and regulatory requirements for excluded operations.

Key topics and requirements

• Prefill visual and identification checks (inspection of cylinder condition, markings, test dates and valve condition).
• Authorized cylinder specifications and limits (DOT/TC/UN types and maximum water capacity up to 125 lb / 57 kg).
• Filling procedures for nonliquefied (gaseous) vs. liquefied gases (weight, liquid level considerations, and temperature/pressure control).
• Pressure and temperature considerations during filling, and maximum filling practices to avoid overpressure and structural stress.
• Contamination prevention, oxygen safety and incompatibility controls (cleaning, particle/moisture control, and segregation).
• Requirements and guidance on pressure‑relief devices and valve integrity during filling.
• Recordkeeping, labeling, and marking requirements for filled cylinders.
• Explicit exclusions and references to other CGA publications or regulations for specialized topics (e.g., flammable gases, cryogenics, transfilling, automated palletized systems).

Typical use and users

Intended for gas suppliers, cylinder filling plant operators, medical gas providers, food‑gas packagers, safety and compliance managers, technical trainers, and regulators. It is used as a practical reference for day‑to‑day filling operations, for development of company procedures and training programs, and as a normative reference where safe filling practices are required.

Related standards

Commonly used alongside other CGA and regulatory documents such as: CGA P-1 (safe handling of compressed gases), CGA P-99 (filling of flammable gases), CGA C-6 series (visual inspection of cylinders), CGA V-1/V-9 (valve connections and valve standards), and relevant national transport/filling regulations (e.g., 49 CFR part 173 and related DOT/TC requirements). Users should consult those documents for complementary requirements not covered by P-15-2022.

Keywords

cylinder filling; nonflammable gases; compressed gas cylinders; medical gas; industrial gas; liquefied gas; cylinder inspection; filling procedures; CGA P-15; safety; DOT/TC/UN cylinders.

FAQ

Q: What is this standard?

A: CGA P-15-2022 is the Compressed Gas Association’s industry standard that provides recommended practices for filling selected nonflammable compressed gas cylinders.

Q: What does it cover?

A: It covers recommended filling practices, required prefill checks, acceptable cylinder types and gases (air, argon, CO2, helium, nitrogen, nitrous oxide, oxygen), limits by water capacity (up to 125 lb / 57 kg), and specifies exclusions (e.g., flammable gases, cryogenic liquids, transfilling, automated/palletized operations).

Q: Who typically uses it?

A: Cylinder filling facilities, gas producers and distributors, medical gas suppliers, safety and compliance personnel, trainers, and regulators use the standard to develop safe operating procedures and training.

Q: Is it current or superseded?

A: It is current (published June 7, 2022) and supersedes the previous edition, CGA P-15-2016. Users should confirm the edition required by any regulatory incorporation by reference.

Q: Is it part of a series?

A: Yes — it is part of CGA’s P-series of guidance/standards for safe practices (P-1, P-15, P-99, etc.) and is used together with CGA C-series (inspection/requalification), V-series (valves), TM training modules, and applicable transport regulations.

Q: What are the key keywords?

A: cylinder filling, nonflammable, compressed gas, inspection, DOT/TC/UN cylinders, filling procedures, oxygen safety, contamination control.