Harvel EnviroKingUV™ piping is produced from a unique, rigid, transparent PolyVinyl Chloride (PVC) compound with a Cell Classification of 11553 per ASTM D1784. This material, which shows a slight blue tint, has been specifically formulated to block damaging UV light. Harvel EnviroKingUV is compatible with conventional IPS size PVC pipe, fittings, and valves and can be incorporated into existing PVC systems via the solvent cement joining process. It exhibits similar chemical resistance properties to conventional clear PVC, and in general is resistant to most acids, bases, salts, and oxidants. Chemical compatibility should be confirmed prior to use in chemical service environments.
Harvel EnviroKingUV piping provides a versatile, cost-effective alternative for many piping applications where light transmission through the pipe is critical, or other applications where visual monitoring of processes is necessary (i.e., sight glass applications). This product possesses the well-known benefits of rigid PVC such as: exceptional corrosion resistance; smooth interior walls for unimpeded flow and reduced sediment buildup; fast, reliable solvent-welded connections; good pressure-bearing capability; and ease of handling and installation, to name a few. All of these important attributes are now available in a unique transparent product with UV stability.
Harvel EnviroKingUV™ ThinWall™
Harvel EnviroKingUV™ is a low-pressure containment pipe which provides optimum dimensions for use as photobioreactor vessels and similar applications. For example, when used in photobioreactors, the unique wall dimensions improve light transmission characteristics benefi cial for enhanced algae growth, while maintaining product rigidity.
Harvel EnviroKingUV™ Schedule 40
Harvel EnviroKingUV™ is also manufactured in IPS sizes to Schedule 40 dimensions, which provide suffi cient wall thickness for many pressure applications. It is suitable for use in both positive and negative pressure applications (i.e., vacuum service). As with all schedules of thermoplastic pipe, pressure rating is dependent on the pipe diameter selected as well as the operating temperature of the system. As temperatures rise, the pressure rating of the system decreases. Smaller diameter piping can withstand higher pressures than large diameter piping. Refer to the table below for dimensions, tolerances, and pressure ratings.
Harvel EnviroKingUV piping is available in two iron pipe size (IPS) pipe dimensions; ThinWall™ dimensions specifi cally developed for use in photobioreactor construction, and standard Schedule 40 dimensions.
Pressure ratings are dependent on the pipe diameter selected, the wall thickness, and the operating temperature of the system. As temperatures rise, the pressure rating of the system decreases. Smaller diameter piping can withstand higher pressures than large diameter piping. Refer to the tables above for dimensions, tolerances, and pressure ratings. The temperature de-rating factors shown at right are to be multiplied by the pressure ratings listed to determine the maximum pressure rating of the pipe at elevated temperatures.
- Manufactured to both ThinWallTM and standard Schedule 40 dimensions
- Joined utilizing simple solvent-welded joining techniques
- Manufactured to IPS dimensions Fully compatible with standard PVC pipe, fi ttings, and valves
- Corrosion resistant
- Lightweight, easy to handle and install
- Lower overall installed cost than glass, acrylic, or other transparent alternatives
System Design and Installation
Storage & Handling
Although Harvel EnviroKingUV™ products are tough and corrosion resistant, they should not be dropped, have objects dropped on them, nor subjected to external loads. Thermoplastics can be damaged by abrasion and gouging. Pipe must not be dragged across the ground or over obstacles. Impacts such as dropping from sizable heights and/or rough handling should be avoided, particularly in cold weather. The product shall be inspected for any scratches, splits, or gouges that may have occurred from improper handling or storage. If found, these sections must be cut out and discarded.
Harvel EnviroKingUV is compatible with conventional IPS size PVC pipe, fi ttings, and valves and can be joined via the solvent cement joining process, providing a quick, strong, leak-tight seal. For optimum joint integrity, Harvel recommends the use of a mediumbodied, fast-setting PVC solvent cement in conjunction with a PVC primer, such as IPS Weld-on 705 Clear cement and IPS Weld-on P-70 Clear primer. Details on proper solvent cementing techniques are available from Harvel and must be reviewed for proper assemblyand joint integrity. Refer to Harvel Engineering & Installation Guide, www.EnviroKingUV.com, (HPB-112/401)
Where disassembly is required, Harvel Clear can be easily joined in the fi eld using standard rigid thermoplastic pipe fi ttings and joining techniques such as fl anges, molded grooved coupling adapters, threaded fittings, and unions. Joining options are limitless when overall system clarity is not a necessity. When threaded fittings are utilized Harvel recommends the use of Tefl on® tape for making reliable threaded connections. (Certain thread paste compounds may contain stress cracking agents; contact the paste manufacturer for compatibility with PVC prior to use.) Generally, two to three wraps of tape in the direction of the threads on the male end, followed by one to two turns beyond finger tight is all that is required to make a leak-free connection.
Threading or grooving of Harvel EnviroKingUV pipe is not recommended due to insuffi cient wall thickness. Use standard PVC specialty transition fi ttings where applicable.
Thermal Expansion and Contraction
Harvel EnviroKingUV piping will expand and contract with changes in temperature. This issue must be addressed with appropriate system design—and during installation—to prevent damage to the piping system. The change in length generated as the result of temperature changes must be calculated based on the anticipated change in temperature that the system will be exposed to. The coeffi cient of linear expansion for Harvel EnviroKingUV pipe is 3.9 x 10-5 in./in./°F. The rate of expansion or contraction can be calculated as follows:
ΔL = 12 yL (ΔT) where:
ΔL = expansion or contraction in inches
y = 3.9 x 10-5 (coeffi cient of linear expansion)
L = length of piping run in feet
ΔT = temperature change °F
(T max. - T@ installation)
In many cases the movement caused by thermal expansion/contraction must then be compensated for by the construction of appropriately sized expansion loops, offsets, bends, or the installation of expansion joints. These confi gurations will absorb stresses generated form the movement, thereby minimizing damage to the piping. The effects of thermal expansion and contraction must be considered for systems involving long runs, and particularly piping systems exposed to environmental temperature extremes (i.e., exposed outdoors, summer to winter).
Hangers and Supports
Support location and spacing is dependent on the pipe diameter, the operating temperature of the system, and the location of any concentrated stress loads (i.e., valves, fl anges, and any other heavy system components).
Proper support spacing is critical to ensure that deflection is kept to a minimum. Hangers used must have an adequate load-bearing surface that is free of any rough or sharp edges that could damage the piping during use. Hangers must also not restrict linear movement of the system due to the effects of expansion and contraction. Overtightening of hangers/supports must be avoided.
Harvel Plastics, Inc. does not recommend the use of this product or other rigid PVC/CPVC piping products for the transportation or storage of compressed air or gases, nor the testing of these systems using compressed air or gases.
Although Harvel EnviroKingUV™ maintains its physical properties when exposed to many substances, exposure to certain chemicals can affect the clarity of the product over time.
Certain nitrogen-containing organics, bleaches, oxidative agents, and acids may result in discoloration. Testing under actual use conditions is recommended. These facts should be considered if optimum clarity is required for the system by testing under actual use conditions at the initial design phase of the project. Chemical compatibility should be confirmed prior to use in chemical service environments.
Threading or grooving of Harvel EnviroKingUV pipe is not recommended due to insufficient wall thickness. Use standard PVC specialty transition fittings where applicable.
All transparent pipe used for photobioreactor or other outdoor applications shall be manufactured from a PolyVinyl Chloride (PVC) compound with a minimum Cell Classification of 11553 per ASTM D1784. This material shall be a UV stabilized PVC material and shall exhibit a slight blue tint. The pipe shall be manufactured to iron pipe size diameters in either ThinWall pipe dimensions that have been optimized for light transmission, or Schedule 40 pipe dimensions as applicable. The pipe shall be manufactured in the USA by an ISO 9001 certified manufacturer. All PVC clear pipe shall be packaged immediately after its manufacture to prevent damage, and shall then be stored indoors at the manufacturing site until shipped from factory.
All pipe shall be manufactured by Harvel® Plastics, Inc., trade name EnviroKingUV ThinWall™, or EnviroKingUV™ Schedule 40 as applicable.
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