The Strongest & Most Durable PVC Pipes, SWR and Plumbing Systems in India
The Strongest & Most Durable PVC Pipes, SWR and Plumbing Systems in India
Frequently Asked Questions

Q. What is cpvc?
A. It is Chlorinated Polyvinyl Chloride. It can withstand high temperature, up to 93 ͦC for short term application and 82 ͦC for continuous application.
   
Q. What is the difference between CPVC & PVC?
A. In a layman's word we can say that CPVC is PVC that has been further chlorinated. CPVC has got all the merits of PVC. The difference is that CPVC can withstand high temperature unlike PVC.
   
Q. In what sizes are the pipes & fittings available?
A. Available from ½" to 2". CPVC pipes in SDR 11 and 13.5 & fittings in SDR 11 as per ASTM D 2846 in CTS.
   
Q. What is SDR & CTS?
A. SDR= Standard Dimensional Ratio
CTS= Copper Tube Size
   
Q. What is the pressure rating of CPVC piping system?
A.
SDR 11 27°C Continuous operating temp. 27.6kg/cm2 operating pressure
SDR 11 82°C Continuous operating temp. 6.8kg/cm2 operating pressure
SDR 13.5 27°C Continuous operating temp. 21.8kg/cm2 operating pressure
SDR 13.5 82°C Continuous operating temp. 5.5kg/cm2 operating pressure
   
Q. Is CPVC safe for drinking water supply?
A. Yes, very much.
   
Q. What is the life of CPVC piping system?
A. Minimum operational life is 50 years. The early installation of 1960 is still in use.
   
Q. How is the installation CPVC is done?
A. Measure the pipe, cut it, bevel the cut ends, wipe it with a dry cloth, apply solvent cement, and rotate the pipe while pushing it inside the fitting.
   
Q. Why should we clean the burrs?
A. For a perfect cold fusion joint.
   
Q. What is the importance of the straight cut of the pipes?
A. For the maximum bondage with pipe & fitting.
   
Q. How much solvent cement should we apply?
A. Not much. This will come with an experience but just make sure that it is applied on all sides of the pipe and inside of the fitting.
   
Q. Why should we rotate the pipe while inserting in the fitting?
A. Just to make sure that the solvent cement is evenly distributed on all sides of the pipe.
   
Q. Why CPVC does not corrode or leak?
A. The inside of the CPVC pipe is like glass finish, very smooth. CPVC has cold fusion joints.
   
Q. Why do we firmly grout the brass insert fittings?
A. If the brass inserted fittings are not firmly grouted it will break at the time of tightening of the CP fitting because of the play. The plumber MUST firmly grout those fittings.
   
Q. How do you support the CPVC pipes in concealed installation?
A. Nails or any sharp edged metal should never be used for supporting the CPVC pipeline inside the groove. We have the option of using the Plaster of Paris or wooden planks.
   
Q. What would happen if we do not clamp the CPVC pipes at suggested distance?
A. Snaking of the pipeline might happen if we do not clamp at the recommended distances (Refer CPVC Technical Manual).
   
Q. Is insulation required for CPVC?
A. Thermal conductivity of FG CPVC pipes & fittings is 0.14W/MK whereas of copper is 400 W/MK. Since CPVC is a very bad conductor of heat, light insulation is recommended only for installations where there is a continuous flow of hot water e.g. Solar/centralized heaters. In bathrooms with independent geysers within 3 meters location insulation may not be necessary.
   
Q. Is UPVC UV stabilized?
A. There is no adverse effect of UV rays on CPVC pipes' pressure and temperature withstanding capacity. Only slight discoloration on the surface happens which can be covered by painting the pipe with any water based paint.
   
Q. What precautions should be taken in solar water heater connection?
A. Use 2-3 feet long metal pipe (nipple) from the solar water heater storage tank to connect the CPVC pipeline, which would help to radiate excessive heat. Prevention must be taken to ensure that there is no entrapment of steam inside the pipeline. Air vent/steam releasing valve must be installed. The pipeline must be clamped at the recommended distance and expansion loop should be given per floor.
   
Q. Why, when and where should we use the expansion loop?
A. For CPVC pipes which are not embedded inside the wall but are carrying hot water from boiler/solar water heater etc, it is most important to use AYON expansion loop for every 12ft run of the pipe, between 2 fixed joints, practically one expansion loop per floor. (Refer CPVC Technical manual)
   
Q. What do you understand by low thermal conductivity?
A. CPVC is particularly not toxic- or in the vernacular of the NBS test- CPVC is "not considered to be more toxic than Douglas fir (Wood)". CPVC emitted smoke levels are also exceptionally low. Testing at Underwriters Labs in Canada has shown that CPVC produces only one-third smoke of kiln-dried wood.
   
Q. How do you repair the punctures in CPVC?
A. Puncture repair snap up clip.
   
Q. What is the life of solvent cement?
A. Same as the pipe and fitting minimum 50 years.
   
Q. What are the advantages of CPVC piping system?
What are the benefits of CPVC over G.I.?
What are the inherent problems in G.I. plumbing system?
A. • Jointing method/procedure is very complex and laborious
• Always prone to leakages, rusting, corrosion, scaling, pitting
• Getting a perfect alignment & a perfect joint is very difficult
• Hygiene- a question mark
• Needs insulation for hot or cold water application
• Maintenance- Complex and costly
• Price instability
• Takes lot of time in project completion
• Life- requires replacement after 5-10 years depending upon water condition.
   
Q. What are the benefits of CPVC over PPR?
What are the problems in PPR plumbing system?
A. • Jointing method/procedure is very complex and laborious
• Requires skilled labour for installation
• Takes a lot of time in project completion
• Requires a lot of support/clamps
• Maintenance- complex and costly
• Hygiene- a question mark
• Insulation- higher thermal conductivity than CPVC pipes
• Flow rate- low compared to CPVC because of higher wall thickness
• Oxygen permeation- higher than CPVC hence greater threat of corroding metal components
• Poor resistance to chlorine in water
• Fire Redundancy- (LOI 18%) readily burns and drips like a candle

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