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CPVC Pipes & Fittings{short description of image} Frequently Asked Questions About CPVC
Where should I use {short description of image} CPVC?
ECOTUBE CPVC is designed for use in hot and cold water distribution systems. ECOTUBE CPVC systems are ideal for all potable water needs of piping in a typical single-family home, apartment, motel, codominium, mobile homes, manufactured homes, light commercial and institutional strurer. Other applications of hot water piping as central heating, radiant floor heating and solar energy can be adapted to CPVC. However, please check with the manufacturer of the heating unit before using CPVC in these applications.

2. What is the expected life of a water distribution system CPVC?
CPVC piping systems have been installed and operating since 1960 and these facilities are still performing flawlessly for more than 40 years. ECOTUBE CPVC system design and standards incorporate significant engineering safety factors which lead to a long service life. CPVC piping is not susceptible to corrosion. Electroly size or scale buildup in areas where water, soil and / or weather conditions are aggressive. We firmly believe that CPVC plumbing systems will provide a service life as long as or longer than other materials on the market.

3. Will an ECOTUBE CPVC system provide a financial benefit to the owners in terms of utilities expense?
Yes. The thermal conductivity of a metal is 2500 times greater than that of a CPVC system. The improved insulating characteistics associated with CPVC can generate long-term savings for a home energy-conscious owner or tenant. CPVC will keep water hot for a much longer period than metal tubing.

4. How can I use CPVC if I run under a concrete slab?
When using CPVC under slab, you must pressure test the system before pouring the slab. In addition, it is wise to use a 1” foam insulating pipe at changes in direction, where the pipe emerges from the slab, and at construction joints, the pipe should also be supported in smooth bottom trenches, the backfill of which whould be free of rock and debris which could damage the pipe.

5. Should specific types of primers and solvent cements be used on a CPVC system? Are specific colors required?
Solvent cement used should always be for CPVC use specifically, and manufactured to meet the requirements of DIN 8080 - 8079 & AStmF493 or equivalent. All-purpose cements should not be used. Purple primer manufactured for PVC pipe is acceptable. Orange CPVC solvent cements facilitate identification. De-pigmented CPVC solvent cement and primers are available and are acceptable in various jurisdictions. Clear cement / primer provide a neater finished appearance.

6. I was told that CPVC pipe ends may split during installation. Why should it occur? How can these cracks be prevented?
Most cracks are initiated by rough handling, this handling can occur during shipment, while being inventoried at the wholesaler, or while on the job site. In addition, fine cracks can be caused by cutting the pipe with dull or damaged ratchet cutters, or using ratchet cutters when temperatures are below 10 ° C. The vast majority of cracks occur during the colder months. When ambient temperatures are below 10 ° C, CPVC, like most other plastics such as PP, PE, PVC-U, may become somewhat brittle and must be handled more carefully. To reduce problems resulting from cracked product, several measures can be initiated:
  • Educate your installers. Make them aware of the potential problem and instruct them to handle CPVC in an appropriate way.
  • Use a saw or a circular pipe cutter with a plastic cutting blade (serrated # 151P or similar) to cut your pipe to length.
  • Inspect pipe ends thoroughly before making a joint. If a crack is evident, cut off any split portion before proceeding.
  • In cold weather, gripping the pipe tightly around the cutting area for about 10 seconds before making the cut will warm the pipe and reduce potential problems.
7. What about CPVC piping in the walls?
CPVC can be embedded within walls, provided that the following points are respected:
  • Embed firmly in the wall, with the piping contained continously with concrete. (The other alternative is to allow the pipe to move freely under thermal expansion. Problems will occur if the pipe is neither completely embedded nor able to expand freely) concrete should be homogeneous, without gravel or stones which risk damaging the pipe. Ensure that the pipe is at least 2.5 cm from the outside surface.
  • Do not embed demountable fittings.
  • At exit and entry points, protect pipes with a sleeve.
  • Pressure testing must be done before concrete is poured.
As the pipe thermally expands, tensile stresses will be developed. Concrete will contain the CPVC; other materials may not, eg: plaserboard. The developed tensile stress, ó , is given by the equation:

C=Coefficient of thermal expansion
T=temperature change
E=Youngs module
This calculated developed tensile stress may be compared to the surrounding material (plasterboard, concrete, etc.) to give an indication whether the material will contain the pipe, or wheter the pipe will crack the wall.
C=6.3 x 10-5 cm/cm°C
E=2650 MPa

8. Is CPVC resistant to U.V. exposure?
If we compare CPVC to some other commonly used piping materials.
Polyethylene and polypropylene:
U.V. acts as a powerful catalyst for the oxidation process that breaks the polymer chains, leading to weakness in the pipe and loss of hydrostatic strength.

The main process of degradation is dehydrochlorination, while slightly accelerated by U.V., it does not break the polymer chains significantly after outdoor exposure, being mainly limited to a surface discoloration. There is a loss of impact resistance due to the impact modifiers losing efficiency. This may even result in increased modulus.
  • There is no significant loss of stress bearing capability
  • 30 years of outside service in southern California.
  • Impact resistance mainly an installation issue (before exposure to UV).
If a portion of the piping system will be left exposed to U.V. light, a standard grade of exterior latex paint will adequately protect the pipe.

9. Is CPVC quieter than a metallic system?
Yes, we can compare the velocityof sound in CPVC to that in copper and water. The velocity of sound in:
The sound will travel in the material with the fastest possible velocity. This means that in a copper system, the sound travels in the copper, whilst in a CPVC system, sound travels in the water and the system is as quite as physically possible.

10. What about scale build up?
Scale build up is a function of roughness of the pipe, as measured by the Hazen-Williams «C» factor used in the formula for calculating friction head losses in piping systems.
Increased value for C {short description of image} Less friction
Less pressure drop

Material C Factor
  NEW After 4-40 years service
CPVC 150 150
copper / steel 130-140 60-120

With metal systems, once corrosion attack starts, (eg: the green color when copper reacts with chlorides in water to form copper chloride) this starts a vicious circle leading to scale build up. With CPVC, there is no corrosion and hence scale build up is inhibited.

11. Is condensation reduced with CPVC?
Yes, for a given ambient air temperature and water temperature in the pipe, the relative humidity must be 10-15% higher with CPVC to get the same degree of condensation; for the same humidity level and water temperature can be ± 10 ° C higher than for copper to get the same degree of condensation.

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