Perlite is a non-toxic and non-flammable product used extensively to insulate cryogenic equipment, and particularly coldboxes.
However, the nature of the material and the large quantities involved require the use of special operations, handling, and safety procedures.
This publication provides guidance for reducing the risks of unplanned perlite releases and incidents that could have potential for personal injury, property damage, downtime, and environmental impact.
It covers the use of perlite in cryogenic coldboxes and cryogenic bulk storage vessels and focuses on safety, perlite handling procedures, and management of perlite in the event of release, and is intended for use by industrial gas plant manufacturers, owners, and operators of facilities that utilize and maintain perlite as an insulation medium for cryogenic equipment.
This edition has an additional section covering cryogenic enclosure annular space pressure check and further requirements for perlite removal and enhanced emergency plan requirements.
Other insulating materials, such as mineral wool or vermiculite and other synthetic silicates, are not covered in this publication.
The publication is part of the programme to develop Globally Harmonised publications amongst Regional Gas Associations.