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Strainers
Kadant offers two different strainer technologies for removal of suspended particulate. The type of strainer best suited for the application depends on the influent solid loading and mesh size selected.
For applications with total suspended solids less than 1000 ppm and media retention requirements between 60-200 mesh (75-233 micron), the Gravity Strainer is recommended.
The 4000 Strainer can effectively remove long and short fibers, felt hair, and granular solids from process water without the stapling of fiber to the filter media often associated with the use of pressure filters. It can also handle system upsets and slugs, without sacrificing the filtered water quality. In many applications, upsets to equipment or process upstream of the gravity unit will result in a large increase in fibrous contaminants. The 4000 Strainer continues to deliver strained water downstream, with a possible temporary rise in reject flow.
New Slip-On gravity strainer screen – replace a worn screen in 20 minutes or less. See how on the video.
Replacing a conventional gravity strainer screen can take up to 16 man-hours and increase maintenance downtime. Kadant’s slip-on screen system with its inflatable seal design makes change-out fast and
easy – usually completed in less than 15 minutes.
The VA Vacuum Assisted Gravity Strainer is an enhanced version of the Gravity Strainer. The unit will operate with influent total suspended solid loadings as high as 5000 ppm (0.5%), and with screen sizes as fine as 325 mesh (44 micron).
The VA (Vacuum Assisted) Strainer offers a simple, effective way for paper mills to recycle process water streams. With construction similar to the Kadant 4000 series Gravity Strainer, the VA Strainer offers higher levels of performance in three key areas: 1) solids retention, 2) throughput, and 3) higher solids capabilities. Proper screen selection and vacuum assisted dewatering provide maximum process protection and produce optimum results for polishing, scalping, and thickening applications. Using a low-horsepower, low-head vacuum exhauster, the VA Strainer is capable of handling 1% feed consistency and lower freeness material than gravity strainers. The low-vacuum draw also enhances the use of finer filtration media for applications previously unachievable by gravity strainers.
An advantage of both strainers is their ability to operate through upset conditions, therefore minimizing equipment downtime and eliminating the need for operator intervention.
