CPVC Duct

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Application
Seamless, corrosion resistant exhaust duct, IPS sizes 6" through 24", for use in corrosive fume handling systems at temperatures up to 200°F. Duct exhibits excellent fire resistance and is classified for Surface Burning Characteristics (independently tested flame and smoke characteristics ULC S102.2 Duct; and FM 4910 Duct Material). Positive and negative pressure ratings vary with duct diameter and temperature as stated on page 2 of this specification. Offers exceptional physical properties, and is generally resistant to most: acids, bases, salts, aliphatic solutions, oxidants, and halogens. Chemical resistance data is available and should be referenced for proper material selection. Typical applications include: chemical processing, plating, clean rooms, water and wastewater treatment, laboratory, and other industrial and institutional applications involving corrosive fume collection, transfer, and reclamation.

Scope
This specification outlines minimum manufacturing requirements for Chlorinated Polyvinyl Chloride (CPVC) iron pipe size (IPS) seamless, extruded round duct. This duct is intended for use in industrial fume handling systems where temperatures encountered do not exceed 200°F.

CPVC Materials
The material used in the manufacture of the duct shall be a virgin, rigid chlorinated polyvinyl chloride (CPVC) compound, with a Cell Classification of 23447 as defined in ASTM D1784. This compound shall be light gray in color, and shall be domestically produced CPVC material, specifically formulated for the manufacturing of CPVC duct, tradename Corzan® CPVC as provided by Lubrizol Advanced Materials. This material meets FM 4910 Clean Room Materials Flammability Test protocol as outlined on page 2 of this specification.

Dimensions
All CPVC extruded duct shall be manufactured in strict accordance to the requirements established by GF Harvel for the production of extruded duct piping; including the physical dimensions and tolerances as stated on Page 2 of this Specification.

Marking
Product marking shall include: the manufacturers name (or the manufacturers trademark when privately labeled); the nominal duct size; the material designation, date of manufacture, and the independent laboratory’s label stating flammability characteristics where applicable.

Sample Specification
All exhaust duct piping, sizes 6" through 24", shall be CPVC seamless extruded type, as manufactured by GF Harvel Inc.; trade name GF Harvel® Duct. Exhaust duct shall be extruded from a Type IV, Grade I Chlorinated Polyvinyl Chloride (CPVC) compound with a Cell Classification of 23447 per ASTM D1784; trade name Corzan® CPVC. All extruded duct shall have a maximum flame spread rating of 5 or less and a maximum smoke generation of 25 or less per ULC S102.2. All extruded duct shall meet GF Harvel Inc. published standards with regard to material and dimensions, and shall carry a maximum temperature rating of 200°F. All extruded duct pipe shall be manufactured in the USA, using domestic materials, by an ISO 9001 certified manufacturer, and shall be stored indoors at the manufacturing site until shipped from the factory. All extruded CPVC duct pipe shall be marked with the manufacturer name or identifying symbol, and the Corzan® CPVC material trademark.

 

Dimensional Specifications

SIZE AVG. OD AVG. OD TOL. O of R TOL. MIN. WALL AVG. WALL MAX. WALL WT(lbs) PER FT.
6"x1/8 6.625 +/- .020 +/- .050 .105 .122 .140 1.530
6" 6.625 +/- .020 +/- .050 .172 .187 .202 2.275
7" 7.375 +/- .020 +/- .050 .172 .187 .202 2.534
8" 8.625 +/- .020 +/- .075 .172 .187 .202 2.982
9" 9.375 +/- .025 +/- .075 .172 .187 .202 3.239
10" 10.750 +/- .025 +/- .075 .172 .187 .202 3.733
11" 11.375 +/- .025 +/- .075 .172 .187 .202 3.944
12" 12.750 +/- .025 +/- .075 .172 .187 .202 4.440
14" 14.000 +/- .030 +/- .075 .172 .187 .202 4.884
16" 16.000 +/- .030 +/- .075 .172 .187 .202 5.586
18" 18.000 +/- .040 +/- .080 .172 .187 .202 6.750
20" 20.000 +/- .070 +/- .140 .199 .219 .239 8.144
24" 24.000 +/- .090 +/- .180 .230 .250 .270 11.163

 

MAX. Internal Negative Pressure Rating
Inches of Water @ Various Temperatures °F
SIZE TEMPERATURE °F
73 80 90 100 110 120 130 140
6" x 1/8 115 101 86 71 59 46 36 25
6" 415 365 311 257 212 166 129 91
7" 301 265 226 187 153 120 93 66
8" 188 166 141 117 96 75 58 41
9" 146 129 110 91 75 59 45 32
10" 97 85 73 60 50 39 30 21
11" 82 72 61 51 42 33 25 18
12" 58 51 44 36 30 23 18 13
14" 44 39 33 27 22 18 14 10
16" 29 26 22 18 15 12 9 6
18" 21 18 16 13 11 8 6 4
20" 24 21 18 15 12 10 7 5
24" 21 18 16 13 11 8 6 4
PSI = Inches of Water x .0361; Inches of Mercury = Inches of Water x .07355

 

MAX. Internal Positive Pressure Rating
PSI @ Various Temperatures °F
SIZE TEMPERATURE °F
73 80 90 100 110 120 130 140
6" x 1/8 42 37 31 26 21 17 13 9
6" 70 62 52 43 35 28 22 15
7" 64 56 48 40 32 25 20 14
8" 53 47 40 33 27 21 16 12
9" 74 65 55 46 38 29 23 16
10" 43 39 32 27 22 17 13 9
11" 61 53 46 38 31 24 19 13
12" 36 32 27 22 18 14 11 8
14" 33 29 25 20 17 13 10 7
16" 28 25 21 17 14 11 9 6
18" 25 22 19 15 13 10 8 5
20" 26 23 20 16 13 10 8 6
24" 25 22 19 15 13 10 8 5

 

General Recommendations

Joining
Thermal welding shall be performed by personnel adequately trained in the art of CPVC welding utilizing the hot gas fusion welding method using CPVC filler welding rod as manufactured for this purpose.

When solvent cemented connections are utilized, the use of an extra heavy bodied CPVC solvent cement (such as IPS 729) and appropriate primer is recommended due to tolerance extremes that can be encountered when working with duct and fabricated duct fittings. Proper solvent cement joining procedures shall be followed.

Hangers and Supports
Hangers selected shall have an adequate load-bearing surface free of rough or sharp edges and shall not cause damage to the duct during use. Hangers and hanger hardware shall be of a corrosive resistant material suitable for use in the system environment.

Ductwork is to be supported independently of hoods, scrubbers, fans, tanks or other equipment wherever possible. Where flexible connections are provided as expansion joints a suitable hanger or support shall be provided at each end of the flexible connection. Consideration shall be given to the possibility of solids accumulation; adequate system support shall be provided where required.

Drains shall be installed where accumulation of moisture is expected at low points in the system as indicated on the drawings.

Fire Performance

Test Protocol StandardTest Results Test Method
Flammability Rating V-0, 5VB, 5VA UL-94
Flame Spread Index <10 ASTM E162
Flame Spread <25
<25
ASTM E-84/UL 723
ULC
Smoke Generation <50
<50
ASTM E-84/UL 723
ULC
Flash Ignition Temp. 900°F  
Average Time of Burning (sec.) <5 ASTM D635
Average Extent of Burning (mm) <10  
Burning Rate (in/min) Self Extinguishing  
Softening Starts (approx.) 295°F  
Material BecomesViscous 395°F  
Material Carbonizes 450°F  
Limiting Oxygen Index (LOI) 60 ASTM D2863
Clean Room Materials
Flammability Test
FPI= 1.20
SDI = 0.09
FM 4910

 

Handling and Storage
Care shall be used when transporting and storing duct to prevent physical distortion. Duct shall not be stored close to heat producing sources, subjected to external loads, or over stacked when stored. Damaged sections must be cut out and discarded.

System Components
All duct fittings, fume hoods, fans, blast gates and other system components shall be fabricated from sheet or duct material of the same wall thickness to maintain system compatibility and integrity.

Reference GF Harvel CPVC Duct product bulletin (Bulletin HPB-106) for additional information pertaining to joining methods, hangers and supports, system components, and other installation related data.