 |
|
|
|
|
|
|
|
|
Fabrication
Standards |
|
|
|
|
|
|
|
PermaShield Pipe
(PSP®) Ductwork Fabrication Standards |
|
|
|
|
|
|
|
The Fab-Tech
Ductwork Fabrication Standard Manual is designed to aid you, our
customer, in becoming acquainted with our fabrication
practices. The manual is in strict accordance with the
practices in the latest S.M.A.C.N.A. manuals. |
|
|
|
|
|
|
|
GENERAL |
|
|
|
|
|
|
|
Codes and Standards |
|
|
|
|
|
|
|
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 the following: |
|
|
|
|
|
|
|
|
Factory Mutual Research
Standard 4922 |
|
|
|
|
|
|
|
|
Limitations and
Requirements: |
|
|
|
|
|
|
|
|
1. |
All ducts shall be interiorly
furnished with fluoropolymer resin coating consisting of a prime
coat 2 to 3 mil (0.05-0.07mm) thick and a top coat 7 to 8 mil
(0.18-0.20mm) thick. The total interior coating thickness
shall not exceed on average of 10 mil (0.25mm). |
|
|
|
|
|
|
|
|
2. |
This duct may be used for smoke
removal and special purpose areas when properly designed and
sized. Sprinklers are not required. |
|
|
|
|
|
|
|
|
3. |
The product shall be
manufactured with identical resins as tested, and according to
the formulation on file with FMRC, and shall meet all physical
requirements of S.M.A.C.N.A. manual for industrial Duct
Construction Standards. |
|
|
|
|
|
|
|
|
4. |
Vertical height of individual
risers within the duct system are not restricted, however, they
shall not penetrate other fire areas. |
|
|
|
|
|
|
|
|
5. |
The manufacturer shall
determine the suitability of the duct systems for specific
corrosive environments. |
|
|
|
|
|
|
|
|
6. |
If the process served by such
duct system produces flammable residue or a combustible fume
source exceeding 1 square foot (0.09 square meter) in area per
inlet which can build up inside the duct, then internal
sprinklers will be required. |
|
|
|
|
|
|
|
|
7. |
ASTM-84 Standard Test Method
for Surface Burning Characteristics. Tested in flat sheet
form at a 20ga. (0.95mm) thickness: Flame Spread 10, Smoke
Density 15. |
|
|
|
|
|
|
|
DUCTWORK |
|
|
|
|
|
|
|
a. |
Base Metal
shall be a series 300 stainless steel. Longitudinal seams
shall be fusion welded. Transverse seams shall be
continuous weld. All seams shall be smooth on the interior
of duct. |
|
|
|
|
|
|
|
b. |
Coating
shall be a fluoropolymer resin and shall be applied per Factory
Mutual Research Corporation's limitations and requirements. |
|
|
|
|
|
|
|
c. |
Duct Assembly shall
be accomplished utilizing either a companion flange (Van Stone)
or Fab-Tech's PSP-EZ™ clamping system: |
|
|
|
|
|
|
|
|
1. |
Companion flanges are available
in sizes 4" thru 84". The minimum number of
holes for flange connection is one hole for each 6" of duct
circumference to the next higher number. |
|
|
|
|
|
|
|
|
2. |
PSP-EZ™ flanges are available
insizes 2" thru 18". The PSP-EZ™ band ring
style of joining system shall provide a minimum compression load
to the gasket of 900psi. |
|
|
|
|
|
|
|
d. |
Gasket Technology: |
|
|
|
|
|
|
|
|
1. |
Companion flange gasket
material shall be a form in place, fully expanded 100% PTFE
joint sealant. |
|
|
|
|
|
|
|
|
2. |
PSP-EZ™ clamp gasket material
shall be a form in place, fully expanded 100% PTFE tape or die
cut gasket (2"-3" diameter). |
|
|
|
|
|
|
|
e. |
Delivery, Storage, and
Handling: |
|
|
|
|
|
|
|
|
1. |
Protection: Protection
is factory applied to ends of ductwork to prevent end damage and
prevent dirt and moisture from entering ducts and fittings. |
|
|
|
|
|
|
|
|
2. |
Delivery: Consignee must
inspect shipment upon delivery and note any and all damages and
discrepancies on Bill of Lading and notify manufacturer within
24 hours. |
|
|
|
|
|
|
|
|
3. |
Storage: Coated ductwork
should not be stored in an area where it will have a chance to
be damaged from traffic or debris. All coated ductwork
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 ground and enclose with water proof wrapping to protect
from dirt and debris. |
|
|
|
|
|
|
|
|
4. |
Handling: If coating is
scratched use appropriate protocol to "spark test"
(refer to catalog Appendix A, Field Modification section) and if
spark is detected, contact manufacturer for repair instruction. |
|
|
|
|
|
|
|
f. |
Testing
shall be performed over the entire coated surface inside and out
(where applicable) and edges. The testing shall be
performed with a DC spark tester used at 2500 volts. |
|
|
|
|
|
|
|
|
Fab-Tech
reserves the right to change or modify specifications without
notice. PSP® and PSP-EZ™ are registered trademarks of
Fab-Tech, Inc. |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
