Poroplate Backwashable Filter Elements0 pages

8439 Triad Drive • Greensboro, NC 27409-9621
P: 336-668-4444 • F: 336-668-4452 • E: info@purolator-facet.com • www.purolator-facet.com

BACK WASHING POROPLATE®
FILTER ELEMENTS
Poroplate® diffusion bonded wire cloth laminate filter elements are designed and manufactured to withstand repeated high pressure back washing. The surface type filter media
characteristic of Poroplate® media allows for repeated cleaning of the element in place,
i.e., without removal from the filter housing. The number of back flush cycles prior to
element removal depends on a number of factors including back wash duration and
pressure, flow rate, terminal pressure drop, and the physical properties of the
contaminant being filtered.
There are several accepted methods of back washing Poroplate® filter elements. The
method selected should take into consideration the available plant equipment as well as
the fluid being filtered and the nature of the contaminant. Listed below are a few generally
accepted procedures for effective back washing. These procedures apply only to liquid
service filters.
GAS/AIR BLOW DOWN

This method of back washing is the least expensive as it does not require the use of any
solvents or other back wash liquid.
The flow to the filters is stopped. The product being filtered remains in the filter chamber.
The outlet valve leading downstream and inlet valve coming from the pump are dosed.
The gas/air inlet valve is opened, as is the backwash discharge valve. The product on the
clean (downstream) side of the filter is forced in a reverse direction through the filter
elements and out of backwash discharge valve. Once the product has been forced from
the element, the gas continues to flow to purge the system of any residual solids inside
the vessel.
This method utilizes the force of the air or gas pressure and the product on the clean side
of the filter element to force the debris from the surface of the element. In cases where
the contaminant is particularly heavy or has an adhesive nature, multiple air or gas blow
down cycles may be required. A gas pressure of 80 -100 psi is recommended for best
results.

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Rev: 8/2/07