Metallic Media

Metallic filter media are widely used throughout the chemical and process industries in the form of perforated or slotted plates of steel, bronze or other materials. These designs provide for easy removal of coarse particles and for supporting loose rigid media. Powdered metal is a porous medium. The physical characteristics, chemical composition, structure, porosity, strength, ductility, shape and size can be varied to meet special requirements. The porosity ranges up to 50% void by volume, tensile strength up to 10,000 psi, varying inversely with porosity, and ductility of 3-5% in tension, and higher in compression.

Table 3. Physical properties and chemical resistance of polyester fibers.a

Specific Gravity 1.38

Moisture Regain

At 65%RH and 68°F(20°C)(%) Water Retention Power (%)

Tensile Strength cN/dtex

Elongation at Break

Resistance to Fungus, Rot, and Mildew

Ultraviolet Light Resistance

10-20 100-105 Rb R

Resistance to Dry Heat

Continuous op

302 150

Short-Term Exposure op

392 200

Chemical Resistance to Acids

Acetic Acid Concentration Sulfuric Acid 20% Nitric Acid 10%

Hydrochloric Acid 25% Alkalies

Saturated Sodium Carbonate Chlorine Bleach Concentration Caustic Soda 25% Ammonia Concentration Potassium Permanganate 50% Formaldehyde Concentration Chlorinated Hydrocarbons Benzene Phenol

Ketones, Acetone

Ud u

a Average properties reported as based on typical industry sources, b R = recommended; c C = conditional; d U = unsatisfactory

Table 4. Standard fibers and micrometer ratings for bag filters.2

Available Micrometer Ratings

Table 4. Standard fibers and micrometer ratings for bag filters.2

Available Micrometer Ratings

Construction

1

10

25

50

100

150

200 250 300 400

600 800

Felts

Polyester

X

X

X

X

X

X

Polypro

X

X

X

X

X

pylene

Multifilament

Polyester

X

X

X X X X

X

Meshes

Nylon (heavy)

X

Monofilament

Nylon

X

X

X

XX XX

X X

Meshes

Polypropylene

X

X

Compatibility and Temperature Limits for Standard Bag Materials

Compatibility with

Compatibility and Temperature Limits for Standard Bag Materials

Compatibility with

Fiber

Organic Animal, Microorg Alkal Orga- Oxidi- Miner- Tempera-Solvents Vegetable, anisms ies nic zing al ture Limits and Petro Acids Agents Acids (°F) _Oils_

Polyester Excellent Excellent Excellent Good Good Good Good 300

Polyprop Excellent Excellent Excellent Excel Excell Good Good 225

ylene lent ent

Nylon Excellent Excellent Excellent Good Fair Poor Poor 325

SELECTING THE RIGHT FILTER MEDIA 135 Bag Capacities and Dimensions_

Bag Dimensions

SELECTING THE RIGHT FILTER MEDIA 135 Bag Capacities and Dimensions_

Bag Dimensions

Bag

Fits Rosedale

Bag Surface

Bag Volume

Length

Diameter (in.)

Size

Model No.

Area (ft2)

(gal)

(in.)

No.

1

815

2.0

2.1

16.5

7

2

830

4.4

4.6

32.0

7

1

815

1.6

1.7

14.5

5.75

(inner)

2

830

3.6

3.8

30.0

5.75

(inner)

Powdered metal cannot be readily ground or machined. It is made in discs, sheets, cones or special shapes for filtering fuel oil, refrigerants, solvents, etc. The smooth surface associated with a perforated plate permits brush cleaning or scrubbing in addition to the naturally easier discharge from such surfaces. The hard metallic material has a long life, not being subject to abrasion or flexing. The size of particles filtered on such plates must be relatively large. Normally, plates are confined to free-filtering materials where there is little danger of clogging. Metallic filter media may be used either for cake filtration or depth filtration, i.e., pore clogging. Regeneration of media may be achieved by dissolving solid particles inside the pores or by back thrust of filtrate.

Table 5. Comparative particle sizes.

U.S. Mesh

in.

¡jxa

3

0.265

6730

3Vz

0.223

5660

4

0.187

4760

5

0.157

4000

6

0.132

3360

7

0.111

2830

8

0.0937

2380

10

0.0787

2000

12

0.0661

1680

14

0.0555

1410

16

0.0469

1190

18

0.0394

1000

20

0.0331

841

25

0.0280

707

30

0.0232

595

35

0.0197

500

40

0.0165

420

45

0.0138

354

U.S. Mesh

in.

lim

50

0.0117

297

60

0.0098

250

70

0.0083

210

80

0.0070

111

100

0.0059

149

120

0.0049

125

140

0.0041

105

170

0.0035

88

200

0.0029

74

230

0.0024

63

270

0.0021

53

325

0.0017

44

400

0.0015

37

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