CGA’s May 2019 Safety Publications (New Releases & Revisions)

June 23, 2019

During May 2019, the Compressed Gas Association (CGA) issued the following new and/or revised safety standards and guidelines:

C-3 – Standards for Welding on Thin-Walled, Steel Cylinders

Released: May 1, 2019 (8th Edition)

CGA established this standard to promote uniformity and serviceability of compressed gas containers produced under the specifications of the U.S. Department of Transportation (DOT) and Transport Canada (TC) for manufacturers of welded steel compressed gas containers and for inspectors who may be called upon to qualify welding on such containers.

This standard is applicable to DOT/TC specification containers of 900 psi (62.1 bar) maximum service pressure, 454 kg (1,000 lb) maximum water capacity, and maximum wall thickness of 0.375 in (9.53 mm).

C-18 – Methods for Acoustic Emission Requalification of Seamless Steel Compressed Gas Tubes

Released: May 17, 2019 (4th Edition)

Provides guidelines for the acoustic emission (AE) testing of certain specification tubes as authorized by special permits and equivalency certificates.

Two methods of AE testing are addressed: method A and method B. Method A, which is approved in the United States by DOT and in Canada by TC, consists of an AE test performed during pneumatic pressurization to at least 110% of the normal fill pressure or marked service pressure, whichever is greater. This requalification test replaces the water jacket hydrostatic test.

Method B, which is approved in Canada, consists of an AE test performed during the hydrostatic proof pressurization to the requalification pressure of the tube.

H-3 – Standard for Cryogenic Hydrogen Storage

Released: May 30, 2019 (3rd Edition)

This publication contains the suggested minimum design and performance requirements for shop-fabricated, vacuum-insulated cryogenic tanks (vertical and horizontal) intended for above ground storage of liquid hydrogen.

Applies to liquid hydrogen storage tanks with maximum allowable working pressures (MAWP) up to and including 175 psi (1,210 kPa). Tanks less than 1,000 gal (3,785 L) gross volume or greater than 25,000 gal (94,600 L) gross volume and all transportable containers are excluded.

M-4 – Guideline for Validation of Medical Cylinder Filling Systems

Released: May 17, 2019 (2nd Edition)

Provides validation guidance for compressed medical gas manufacturing operation at container filling facilities, typically referred to as cylinder filling or packaged gas operations. These container filling operations include high pressure cylinder filling operations, portable cryogenic container filling operations, and small bulk container (for example, vehicle mounted vessel) filling operations.

This publication does not address:

  • validation of bulk manufacturing and trailer or railcar filling operations such as operations conducted at air separation plants (for information on bulk operations, see CGA P-8.2)
  • analytical method validations (for information on analytical method validations for cylinder filling operations, see CGA M-6)

CGA’s related publications include:

CGA P-8.2Guideline for Validation of Air Separation Unit and Cargo Transport Unit Filling for Medical Oxygen and Medical Nitrogen

CGA M-6Guideline for Analytical Method Validation

P-2 – Guideline for Characteristics and Safe Handling of Medical Gases

Released: May 24, 2019 (11th Edition)

This publication provides information about and guidance for, the safe handling of compressed medical gases. It is intended to protect personnel in health care facilities, including hospitals, nursing homes, doctor and dental offices, and clinics or as otherwise defined in the National Fire Protection Association’s NFPA 99, Health Care Facilities Code.

Describes the properties of common medical gases, medical gas containers, and safe practices and handling of these gases.

P-11 – Guideline for Metric Practice in the Compressed Gas Industry

Released: May 16, 2019 (5th Edition)

This guideline includes volume, pressure, mass, and other conversion factors pertinent to the compressed gas industry.

Provides a guide concerning units that are to be used to express:

  1. volume and/or mass of gas in compressed gas containers
  2. pressure
  3. container water capacities

P-19 – CGA Recommended Hazard Ratings for Compressed Gases

Released: May 15, 2019 (4th Edition)

This publication recommends hazard ratings for most of the compressed gases found in CGA C-7Guide to Preparation of Precautionary Labeling and Marking of Compressed Gas Containers, in accordance with the National Fire Protection Association system, which is published in NFPA 704 – Standard System for the Identification of the Hazards of Materials for Emergency Response.

V-5 – Standard for Diameter Index Safety System (Noninterchangeable Low Pressure Connections for Medical Gas Applications)

Released: May 24, 2019 (7th Edition)

The Diameter Index Safety System defines noninterchangeable removable connections for use with medical gases at pressures of 200 psi (1,380 kPa) or less.

Removable, threaded connections are readily and commonly engaged or disengaged in routine use and service and are often found on regulators, resuscitation equipment, anesthesia equipment, therapy equipment, and other similar equipment.