Publication

S-1.1: Pressure Relief Device Standards-Part 1-Cylinders for Compressed Gases

Abstract

This standard applies to the selection of pressure relief devices (PRDs) for a single component compressed gas in cylinders. For selection of PRDs for compressed gas mixtures in cylinders, see CGA S-7, Standard Method for Selecting Pressure Relief Devices for Compressed Gas Mixtures in Cylinders.

This standard represents the minimum requirements for PRDs considered to be appropriate and adequate for use on cylinders with a water capacity less than or equal to 1000 lb (454 kg). Refer also to 49 CFR, CSA B340, and/or CSA B342. This standard also applies to composite overwrapped pressure vessels (COPVs), DOT-3AX, DOT-3AAX, and DOT-3T cylinders with a water capacity greater than 1000 lb (454 kg) as well as UN pressure receptacles with a water capacity up to 3000 kg, and which comply with the design specifications and charging (filling) and maintenance regulations of DOT or the corresponding specifications and regulations of TC.

This standard does not cover PRD requirements for CTC/DOT-4L and TC-4LM insulated cylinders containing cryogenic liquids, see CGA S-1.2, Pressure Relief Device Standards—Part 2—Portable Containers for Compressed Gases. This standard does not cover PRD requirements for multi-unit tank car tanks (DOT106A/TC106A and DOT110A-W/TC110A), see 49 CFR 179.300-15 and CGSB 43.147, Construction, Modification, Qualification, Maintenance, and Selection and Use of Means of Containment for the Handling, Offering for Transport, or Transporting of Dangerous Goods by Rail, as appropriate.

This standard includes tables that provide information pertaining to PRDs. Table 1 contains information on the different types of PRDs. Table 2 provides a list of gases and their PRD assignments. Table 3 contains temperature correction factors. Table 4 includes values for basic orifice factors flange taps for flow in ft3/minute.

For PRD standards for bulk transport containers and stationary storage containers, see CGA S-1.2 and CGA S-1.3, Pressure Relief Device Standards—Part 3—Stationary Storage Containers for Compressed Gases .

Previous edition cited in 49 CFR. Previous edition cited in 29 CFR.

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Properties

Edition:
17
Published:
March 2025
Status:
Available To the Public
Size:
45 pages
Publisher:
CGA
Special Attributes:
Referenced by NFPA
Referenced by ICC
Notes:
Committee:
Cylinder Valve

Cataloging

Category
Pressure Relief Devices     Standards & Guidelines
Keywords
cylinders  |  pressure relief devices
Related
C-12  |  C-14  |  C-15  |  S-1.2  |  S-1.3  |  S-11  |  S-7  |  V-1  |  V-7  |  V-9