ASABE Adopts International Standard for Closed Transfer Systems

The American Society of Agricultural and Biological Engineers (ASABE) has completed the identical national adoption of ISO 21191:2021 Equipment for crop protection – Closed transfer systems (CTS) – Performance specifications.

This standard applies to closed transfer systems for liquid formulations of plant-protection products in 1- to 20-liter containers. It specifies operator- and environment-related safety requirements, and means of verification, in system design and construction.

The adoption will further harmonize national and international standardization, a goal that facilitates manufacturing, safety advancements, and product marketing worldwide. ASABE members with standards access and those with site-license privileges can access the standard’s scope electronically on the ASABE online Technical Library at

. For information on this or any other ASABE standard, contact Scott Cedarquist at 269-932-7031, A current listing of all ASABE standards projects can be found on the ASABE web site at