Publication

P-102: Methods to Prevent the Activation of Pressure Relief Devices on Portable Tanks Transported by Sea and Rail

Abstract

This publication provides guidance on the safe transport of refrigerated liquefied gases in unaccompanied tanks, including UN portable tanks shipped by rail or sea. In these transport modes, tank pressure cannot be actively monitored or controlled, which may allow pressure to increase to the set point of pressure relief devices (PRDs), resulting in venting and the potential for noise, vapor cloud formation, and emergency response actions.

To address this risk, the publication defines and presents a method for calculating the holding time—the period required for a tank to reach the PRD set pressure after filling. It emphasizes the importance of planning shipments so that transit duration remains within the calculated holding time.

The document also includes a checklist to verify tank condition prior to shipment and outlines practices to ensure safe transport operations. Although road transport tanks are typically accompanied by drivers and are outside the primary scope, the publication notes that similar pressure management practices may be applied to reduce the likelihood of PRD activation.

Overall, this guidance supports shippers and operators in minimizing unintended venting events and ensuring safe, efficient transport of refrigerated liquefied gases.

Access Publication

Member Price:
$35
Subscriber Price:
$35
Non-Member Price:
$64

Member E-Pub Price:
$0
Subscriber E-Pub Price:
$0
Non-Member E-Pub Price:
$64
Buy Hard Copy
Purchase E-Pub
View Table of Contents (free)

Properties

Edition:
1
Published:
May 2026
Status:
Available To the Public
Size:
7 pages
Publisher:
CGA
Special Attributes:
Harmonized
Notes:
Harmonized with EIGA Doc 184
Committee:
Bulk Distribution Equipment and Standards