Filter Bag Sizes
Eaton offers the four most common "industry standard" filter bag
sizes, referred to as #1, #2, #3 and #4 sizes as follows:
|Maximum Flow Rate, water
FT 2 (m2)
|1||7 (177.8)||17 (431.8)||90 (341)||2.6 (0.24)||2.0 (7.60)|
|2||7 (177.8)||32 (812.8)||180 (681)||5.0 (0.46)||4.5 (17.0)|
|3||4 (101.6)||9 (228.6)||25 (95)||0.8 (0.07)||0.5 (1.90)|
|4||4 (101.6)||15 (381.0)||50 (189)||1.5 (0.14)||0.7 (2.70)|
Filter Bag Retention
Retention is expressed in microns (μm); Divide by 1000 to convert to millimeters (mm).
Filter Bag Efficiency
Eaton filter bags are offered in two efficiencies, "nominal" and "99%":
Nominal is a manufacturer defined efficiency and for Eaton filter bags nominal rated filter bags are 65% efficient. Therefore, with a new, clean filter bag, ≥65% of the particles of the stated retention will be retained by the filter bag. As particles become trapped within the filter bag media, the open area available decreases and thereby increases the efficiency of the filter bag. As an example, a nominally rated 1μm filter bag begins with an efficiency of 65% for retention of all particles ≥1μm.
99% or "absolute" refers to the efficiency for the stated retention, therefore a 99% efficient 1μm filter bag will retain 99% of all particles ≥1μm.
Higher efficiencies are obtained by increasing the thickness of the filter bag material and in some cases, using multiple layers of material, each layer having a different retention. This creates a torturous path for the particles to follow and maximizes the volume of particles that can be retained before changing the filter bag.
Filter Bag Seals
Eaton Filter Bags are generally available with two types of sealing rings, a SNAP-RING™ and a SENTINEL™ RING.
SNAP-RING™ filter bags are "economy bags" having nominal efficiencies. To help ensure the flow passes through the filter bag material and not around the edges of the filter bag opening, a ring is sewn into the material which "snaps" into a corresponding groove in the filter housing support basket. SNAP-RING™ filter bags are available with stainless steel, carbon steel, polypropylene and nylon rings.
SENTINEL™ RING filter bags have a molded plastic ring welded to the filter bag, their shape also "snaps" into the corresponding groove in the support basket like SNAP-RING™ filter bags. In addition, due to their unique shape, downwards compression creates a superior "crush seal"; pushing the OD of the filter bag into the ID of the support basket groove for a tighter seal. To fully benefit from SENTINEL™ RING filter bags an optional "hold down ring" is required to transfer the lid closure pressure to the SENTINEL™ RING. Some filter housings, such as the goose-neck style TOPLINE™, do not require a hold-down ring.
Filter bag restrainer baskets provide support to a filled filter bag, reducing the chance for filter bag damage. The standard filter bag restrainer basket is constructed of 316SS, has 9/64" (3.57mm) perforations and is slightly shorter than the filter bag length to ensure full support. We can provide 20, 30, 40, 60, 80, 100, 150, 200 and 325 mesh lined support baskets to "convert" your filter housing to a strainer if desired.