Use of air on the pushover ram to clean standpipes is an acceptable practice…

Filnamn: Use of air on the pushover ram to clean standpipes is an acceptable practice; Filtered air is required for operating cabs; Request for variance on requirements for filtered air for standby wharf pulpi

OSHA interpretation letter responding to a variance request under the Coke Oven Emissions Standard, stating that air on the pusher ram with modified nozzles is an acceptable mechanized standpipe cleaner if the operator stops the ram under the standpipe, and that standpipes generally need cleaning when 20 percent or more of the cross-sectional area is blocked.