require a test and sample combination section
between stages.
A swing-away mixing device is only used in leakage
testing. The device swings out of the way in normal
filtration operation.
Upstream injection and downstream sampling sections
are required if particulate is to be filtered from
the air stream.
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The test sections shall be provided as an injection, sampling, and/or
injection and sampling combination as indicated, constructed in a manner
identical to the remainder of the filtration system housing and meet the
applicable design parameters of ASME N509. Where a second stage of [HEPA
filters] [or] [carbon adsorbers] is required, an injection and sampling
combination test section shall be used between the first and second stages.
The test sections shall be constructed such that adjoining parallel test
sections are isolated from each other. This shall permit [individual
efficiency and mechanical seal test of each HEPA filter] [and] [mechanical
seal tests of the carbon adsorber] and supporting framework in accordance
with ASME N-510-1. The pressure drop across each test section shall be no
greater than 62 pascals at 472 L/s 0.25 inches wg at 1000 cfm during the
test. Stationary baffle type test sections are not acceptable. The test
section shall be furnished with swing-away mixing devices. Injection and
sample ports and apparatus shall be provided to form an integral part of
the test section.
2.7
IN-PLACE TEST PORT
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NOTE: If only gas adsorption is to be performed by
the filtration system in lieu of upstream and
downstream sampling sections, aerosol injection and
sample ports may be used.
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[Upstream challenge aerosol inlet and sample ports shall be provided for
each [HEPA filter] [or] [carbon adsorber] section. The test port shall be
a 12 mm 1/2 inch NPT Type 304 stainless steel coupling with plug, used for
upstream sampling, located upstream of the HEPA filter and welded to the
top side of the filtration system housing.] [Three additional test ports
shall be provided and shipped loose for field installation into the
ductwork; one used for injection upstream, one used for sampling before the
filter housing, and one used for downstream sampling of the filtration
system housing. Upstream inlet and sample port and downstream sample port
shall be located to provide uniform mixing during field-testing as required
by ASME N509 and ASME N-510-1.]
2.8
WEATHER COVER
Filtration systems located in unsheltered areas shall be protected by use
of an integral weather cover. The weather cover shall be constructed of
the same material as the filter housing and mechanically fastened and
gasketed to the filter housing.
SECTION 15860A
Page 16
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