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 and FMRC 4910). 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, as provided by Noveon, Inc. This material meets FMRC 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 Harvel Plastics, Inc. 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.

DIMENSIONAL SPECIFICATIONS

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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.

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FIRE PERFORMANCE

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

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