Filter Construction - doe-std-3020-20050012

DOE-STD-3020-2005

gelatinous seal substance shall be corrosion resistant, shall not relax,

crack, separate, or stick or adhere to the knife-edge, and shall be

insoluble in water. Evaporation shall be less than 2% when tested in

accordance with SAE AS-8660C for 24 hours at 390 0 F (198 0

C).

5.3.6

Face Guards : Face guards shall be installed in each face of the filter in

accordance with ASME AG-1, FC-3000 with a " x " mesh size or

fabricated from 18 or 22 gauge 4x4 mesh stainless steel (304 or 304L)

hardware cloth in accordance with ASTM E 2016 when specified.

5.4

Filter Construction: HEPA filter construction shall conform to ASME AG-1, FC-

4000 and FC-6000 unless otherwise noted.

5.4.1

Dimensions : The configuration and dimensions of open face rectangular

HEPA filters have been standardized and listed in Table 5.1. Dimensional

tolerances of standard HEPA filters should conform to those specified in

Table 5.2. All other filter configurations are considered "special" filters as

described in Section 5.5. Use of standard HEPA filters is encouraged where

practical.

5.4.2

Filter Pack Construction: Filter packs shall be constructed in accordance

with ASME AG-1, FC-4000 and 6000 except that no splices or patches are

allowed in the filter media. Repair of pin holes and other defects is not

acceptable.

5.4.2.1

Separator Filters : Filters with corrugated separators shall be in

accordance with ASME AG-1, FC-4000, Type A. Separators

shall extend at least 1/8 in. (3 mm) beyond the pleats of filter media.

Separator fixed ends, when viewed from the upstream and

downstream faces shall be embedded in the adhesive/sealant.

Filters with glue separators shall be in accordance with ASME AG-

1, FC-4000, Type B.

5.4.2.2

Separatorless Filters : Filters without separators shall be in

accordance with ASME AG-1, FC-4000, Type C. Dividers shall

be provided as appropriate for additional support of the case and

media. The trimmed edges of the filter element shall be firmly

embedded into the sealant. The two end flap edges shall have

sufficient sealant to secure them to the case sides.