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Sec 1589X |
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This
document is provided as a sample specification for inclusion in
requests for quotation from Fab-Tech, Inc. Specification is
based on the format used by the American Institute of Architects. |
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SECTION
1589X |
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DUCT
FOR CORROSIVE FUME EXHAUST |
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PART
1 - GENERAL |
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REV:
10/22/08 CAT060AG |
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1.1
Related Documents |
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A. |
Drawings
and general provisions of contract, including General and
Supplementary Conditions and Division 1 Specification Sections,
apply to work of this Section. |
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B. |
Division
15 Basic Mechanical Materials and Methods Sections apply to work
of this Section. |
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1.2
Related Work |
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A. |
Extent
of coated duct is indicated on drawings and in schedules, and by
requirements of this section. |
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B. |
Refer to
other Division 15 sections for exterior insulation of coated duct,
not work of this section. |
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C. |
Refer to
other Division 15 sections for fans and air handling units; not
work of this section. |
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1.3
Quality Assurance |
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A. |
Manufacturer's
Qualifications: Firms regularly engaged in the manufacture
of coated stainless steel duct products of types,
materials, and sizes required. Manufacturer shall perform
their own sheet metall fabrication and coating processes. The owner and/or his representatives shall have the
right to tour the manufacturer's plant anytime that fabrication is
being performed on duct intended for this project. |
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1. |
Codes
and Standards: |
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a. |
Ducts
shall be listed for use without the necessity for internal fire
protection sprinklers or any devices relied on to cut off air flow
in the event of fire by Factory Mutual Research Standard 4922. |
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i. |
Duct
shall have a flame spread of less than 25 and a smoke generation
rate of less than 50. |
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ii. |
Duct
shall be Factory Mutual approved for use without sprinklers for an
unlimited vertical height. |
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iii. |
Duct
shall be Factory Mutual approved for sizes 4 inch through 60
inches in diameter |
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iv. |
Clamped type (EZ
Clamp) connections shall be Factory Mutual approved for duct sizes
4 inch through 14 inch. |
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b. |
S.M.A.C.N.A.
Standards: Comply with S.M.A.C.N.A.'s "HVAC Duct
Construction Standards, Metal and Flexible" for fabrication
and installation of metal duct and S.M.A.C.N.A.'s "Round
Industrial Duct Construction Standards" intended for use by
designers of industrial ventilation systems. |
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B. |
Installer
Qualifications: Installation contractors shall have at least
3 years of successful experience on duct projects, specifically
industrial exhaust systems. |
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1. |
Codes
and Standards: |
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a. |
ASHRAE
Standards: Comply with ASHRAE handbook, Equipment Volume,
Chapter 1 "Duct Construction", for fabrication and
installation of metal duct. |
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b. |
NFPA
Compliance: Comply with NFPA 90A "Standard for the
Installation of Air Conditioning and Ventilation Systems",
NFPA 90B "Standard for the Installation of Warm Air Heating
and Air Conditioning Systems" and NFPA 91 "Standard for
the Installation of Blower and Exhaust Systems." |
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c. |
Field
Reference Manual: Have available for reference at project
field office, copy of S.M.A.C.N.A. "Round Industrial Duct
Construction Standards." |
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1.4
Submittals |
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A. |
Submit
manufacturer's technical product data and installation
instructions for coated stainless steel duct. |
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B. |
Shop
Drawings: Submit scaled layout drawings of coated duct and
fittings including, but not limited to, duct sizes, locations,
elevations, and slopes of horizontal runs, walls and floor
penetrations, and connections. Show interface and spatial
relationships between coated duct and adjacent equipment.
Show modifications of indicated requirements and how those
modifications ensure that free area, materials, and rigidity are
not reduced. |
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1.5
Delivery, Storage, and Handling |
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A. |
Protect
coated duct from damage due to normal handling during shipment and
storage. Protection shall be applied to ends of duct to
prevent dirt and moisture from entering ducts and fittings. |
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B. |
Consignee
must inspect shipment upon delivery and note any and all damages
and discrepancies on bill of lading and notify manufacturer within
24 hours. |
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C. |
Coated
duct should not be stored in an area where it will have a chance
to be damaged from traffic and debris. All coated duct
should be stored on cardboard, styrofoam or similar
materials. Where possible, store inside and protect from
dirt and debris. Where necessary to store outside, store
above grade and enclose with waterproof wrapping to protect from
dirt and debris. |
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1. |
If
coating is scratched during shipping or handling it must be
inspected using the methods described in Section 2
"Products," Subsection 2 "Duct Construction
Materials," Subsection A3. Contact the manufacturer for
approved repair procedures. |
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PART
2 - PRODUCTS |
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2.1
Acceptable Manufacturers |
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Fluoropolymer Coated
Stainless Steel Exhaust Duct and Fittings: |
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PSP® & PSP-EZ™
(PermaShield Pipe) as manufactured by: |
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Fab-Tech,
Incorporated |
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480 Hercules Drive |
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Colchester, VT 05446 |
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Coating |
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PermaShield
Fluoropolymer Barrier Coating: |
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Fab-Tech,
Incorporated |
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Colchester, VT 05446 |
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Duct Joint Sealant,
Joint Tape and Die-cut Sheet Gasket |
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Gore-Tex® (Fully
Expanded 100% PTFE) as manufactured by: |
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W.L. Gore and
Associates, Inc. |
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Elkton, MD |
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Part No. |
Description |
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0000C-FAB |
3/16" x 1/8" Joint
Sealant |
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0000D-FAB |
1/4" x 1/8" Joint
Sealant |
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KK-FAB |
1/4" x 3/16" Joint
Sealant |
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0100100.75 |
.010 Gasket Tape |
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2.2 Duct
Construction Materials |
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A. |
Fluoropolymer
coated stainless steel duct shall be constructed in full
accordance with the specifications below. |
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1. |
Base
metal shall be AISI 300 series stainless steel, constructed to a
duct gauge and reinforcing system in accordance with "S.M.A.C.N.A.
Round Industrial Duct Construction Standards" with a Class 1,
-6" WG schedule. Longitudinal seams shall be fusion
welded. Transverse seams shall be butt welded, no dissimilar
filler materials allowed. |
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2. |
The
coating shall be fluoropolymer thermoplastic resin. The
average coating thickness shall not exceed 12 mils (.012 inch).
Complete and uniform coating coverage is required. |
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3. |
The
manufacturer shall perform dielectric testing of the coating on
all pieces of duct. All coated surfaces will be subject to
2500 volts DC with no failures (sparks or audible alarms)
indicated. |
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4. |
Duct
Joints: |
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a. |
Cast stainless steel
ring is the preferred method for connecting coated duct smaller
than 16" diameter. |
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b. |
Companion
(Van Stone) Flange is the preferred method for connecting coated
duct 16" diameter and larger |
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c. |
PSP-EZ™
clamp (V-ring Insert Band Clamps) is the alternate method for
connecting duct smaller than 16" diameter. |
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i. |
Gasket:
Form-in-place, fully expanded 100% PTFE. |
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2.3
Miscellaneous Duct Construction Materials |
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A. |
General:
Provide miscellaneous materials and products of types and sizes
indicated and, where not otherwise indicated, provide type and
size required to comply with duct system requirements including
proper connection of duct and equipment. Support materials
in contact with the duct shall be fabricated of compatible
materials unless otherwise specified. |
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1. |
Duct
Fittings: |
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a. |
Factory
fabricated duct fittings to match adjoining ducts, and to comply
with the contracted duct requirements. Unless otherwise
specified, fabricate elbows with centerline radius equal to one
and one half (1-1/2) times the duct diameter. Unless
otherwise specified, use 45 degree laterals and 45 degree elbows
for branch take-off connections. Limit angular tapers to 30
degrees for contracting tapers and 20 degrees for expanding
tapers. |
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b. |
Predetermine
location of duct drains prior to manufacturer's fabrication.
Drains are to be located at the lowest vertical point of all main
and branch ducts which are P-trapped and/or as shown on the
drawings to allow removal of condensate. |
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c. |
Factory
fabricate duct and fittings with predetermined location of test
holes for monitors. |
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2. |
Duct Joints: |
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a. |
General:
Duct joints may be either Cast Stainless Steel (Companion Bolted
Cast Rings), Van Stone (Companion Angle Ring Bolted
Flanges) or PSP-EZ™ (V-ring Insert Band Clamps). |
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i. |
Cast
Stainless Steel 4" to 14" diameter or Van
Stone Flange 16" to 120" diameter |
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I. |
Construction
shall be generally cast metal or roll formed. Materials shall be either
Mild Steel Alloy or AISI 300 Series Stainless Steel. |
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II. |
Bolt
holes shall be elongated. |
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III. |
Hardware
shall be SAE Grade 5 Plated steel alloy. Grade 5 hardware
shall be tightened to the following values: |
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Bolt Diameter |
Torque (pounds x foot) |
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5/16" |
22 |
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3/8" |
36 |
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IV. |
Gasket
shall be Gore-Tex® Joint Sealant: |
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4"
diameter to 11" diameter = 3/16" x 1/8" |
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12"
diameter to 24" diameter = 1/4" X 1/8" |
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25"
diameter & up = 1/4" x 3/16" |
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ii. |
PSP-EZ™ Joints |
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I. |
Construction
shall be generally roll and press formed stainless steel sheet
goods. |
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II. |
Duct
flanges will be backed with a half round shaped loose metallic
ring shaped to work with the formed profile of the clamp
band. One circumferential bolt with one locknut is used to
tighten the clamp to the duct. |
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III. |
Gasket
shall be a self adhesive Gore-Tex® Tape .010 x .75" on each
end of duct (4" diameter to 14" diameter) or a singular
die cut Gore-Tex® gasket (2" diameter to 3" diameter)
as specified by the manufacturer. Clamp bolt shall be
tightened to the following values: |
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Clamp Bolt |
Torque (pounds x foot) |
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1/4" |
75 ( Ø2", 3",
4", 6", 8" ) |
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5/16" |
120 ( Ø10",
12", 14" ) |
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3. |
Accessories: |
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a. |
Dampers:
Equipment isolation dampers, balancing dampers and header
separation manifold dampers shall be manufactured of the same
materials as the duct unless otherwise noted. All dampers
shall be manufactured in such a way that all surfaces exposed to
the air stream shall be either coated or shall have the chemical
resistance of the PermaShield fluoropolymer barrier coating being
used. This shall include, where
appropriate, o-ring seals on damper shafts and
thermoplastic machined bearings. |
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i. |
Round
Dampers shall be single blade type with locking quadrants and
non-metallic external shaft bearings. Bearings shall be
precision machined thermoplastic. Seals shall be Turcon
variseals for Standard and Heavy Duty Industrial sizes; or shall
be a Teflon® V-ring assembly with thermoplastic sleeve for re-inforced
heavy duty industrial sizes. |
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ii. |
Rectangular
dampers shall be parallel, opposed or back-draft type as indicated
on the drawings. All blade shafts shall pass through Turcon
veriseals, and thermoplastic bearings and shall be connected by stainless steel
bearing supports with blade linkage systems made entirely of
stainless steel, installed external to damper air flow. |
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I. |
Opposed
Blade - Linkage shall be located outside of air stream.
Blades must have blade stops. |
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II. |
Parallel
Blade - Linkage shall be located outside of air stream.
Blades must have blade stops. |
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III. |
Backdraft
damper shall be an adjustable counterbalance type with parallel
action blades. Counterbalance arm shall be 300 series
stainless steel. Linkage shall be located outside of air
stream. Blades must have blade stops. |
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IV. |
Blastgate
shall be non-binding when blade is inserted and extracted.
Construction shall provide adequate support of blade when in the
open position with blastgate mounted in vertical or horizontal
duct. Damper blade shall be segmented to limit weight of
blade sections to 40 pounds maximum. |
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i. |
Horizontal
Isolation Blastgate: Fabricate as above with blade(s) and
flanges perpendicular to air stream with 8 inch maximum flange to
flange width. |
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ii. |
Inclined Isolation
Blastgate: Fabricate as above with flanges perpendicular to
air stream and with blade(s) and track at the maximum incline
based on the blastgate width in table below. |
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Duct Diameter |
Damper Width (inches) |
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4" to 8" |
8" |
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10" to 16" |
12" |
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18" to 48" |
16" |
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PART 3 -
EXECUTION |
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3.1 Installation |
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A. |
Examine
areas and conditions under which coated duct are to be
installed. Do not proceed with work until unsatisfactory
conditions have been corrected in a manner acceptable to
installer. |
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B. |
Assemble
and install coated stainless steel duct while using extreme care
not to scratch surface of coating (if scratched, immediately
contact manufacturer for repair instructions) and in accordance
with recognized industry practices which will achieve air-tight,
under 1% leakage. Install each run with a minimum number of
joints. Align duct accurately at connections, with internal
surfaces smooth. Support ducts rigidly with suitable ties,
braces, hangers and anchors to type, which will hold in accordance
with S.M.A.C.N.A. "Industrial Duct Construction
Standards." |
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1. |
Coating
must not be penetrated during installation. No fastening
devices such as Tek-style screws, rivets, etc. are to be used on
any part of a coated duct application. Test holes and slots
for monitoring must be predetermined before fabrication and
coating unless using approved Fab-Tech Field Modification
Kits. Install coated stainless steel duct as shown on
drawings and described herein, following applicable state and city
codes, and per S.M.A.C.N.A. HVAC Duct Construction Standards. |
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2. |
Routing:
Locate coated stainless steel duct runs, except as otherwise
indicated, vertically and horizontally and avoid diagonal runs
wherever possible. Locate runs as indicated by diagrams,
details and notations or, if not otherwise indicated, run duct in
the shortest route that does not obstruct usable space or block
access for servicing building and its equipment. Hold ducts
close to walls, overhead construction, columns, and other
structural and permanent enclosure elements of building.
Wherever possible in finished and occupied spaces, conceal duct
from view, by locating in mechanical shafts, hollow wall
construction, or above suspended ceilings. Do not encase
horizontal runs in solid partitions, except as specifically
shown. Coordinate layout with suspended ceiling and lighting
layouts and similar finish work. |
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3. |
Electric
equipment spaces: Do not route duct through transformer
vaults and their electrical equipment spaces and enclosures. |
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4. |
Penetrations:
Where ducts pass through interior partitions and exterior walls,
and are exposed to view, conceal space between construction
openings and duct with sheet metal flanges of same gauge as
duct. Overlap opening on 4 sides by at least 1-1/2". |
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