7 Pa. Code § 59a.344
Surge tanks or balance tanks if used between the evaporators and dryer shall be used to hold the minimum amount of condensed product necessary for a uniform flow to the dryers. The tanks holding products at temperatures below 150° F shall be completely emptied and washed after each 4 hours of operation or less. Alternate tanks shall be provided to permit continuous operation during washing of tanks.
This section cited in 7 Pa. Code § 59a.304 (relating to equipment and utensils).