Evaporative condensers are normally considered
permit required confined spaces (PRCS). Under certain conditions, evaporative
condensers can be reclassified to non-permit required confined spaces. This
guideline is intended to assist end users in the development of procedures that
will enable them to reclassify evaporative condensers and allow employees to
enter them without the necessity of PRCS requirements. Because the isolation
and/or removal of ammonia from evaporative condenser circuit(s) can be challenging
and will sometimes be required for reclassification, various methods are
presented.