Specifications include, but are not limited to: Filter screen boxes used shall be BearCat Pumps, LLC Screen Box, as shown in schematic below, or manufactured equal. Screen mesh opening size shall be appropriate to oil being filtered. A minimum flow rate of 100 gallons of material per minute shall be maintained. If filter screen box is used with 0.450 mesh size and fouling of filter occurs, load may be rejected after 2 cleaning attempts and the minimum flow rate cannot be maintained, at the discretion of the maintenance supervisor, at no cost to Nevada Department of Transportation. If smaller mesh size is used it must be determined that fouling of filter is not due to striping of material from emulsion suspension. If fouling of smaller mesh is determined to be caused by stripping of material from emulsion suspension, filter use must be discontinued or a switch to the larger mesh size must take place with unloading time as applicable in 1, 2, and 3, as listed above. If emulsion is not being striped then conditions of this paragraph apply.
