FAQ

The service life of PVC pipes depends mainly on their use. If you choose to use quality pipes and install them without being exposed to sunlight for long period, pvc pipes can be used for more than 50 years.

Exposing the pvc pipes to sunlight for long period can affect the pipe from ultraviolet radiation (UV). Ultraviolet radiation can cause the color of pvc pipes to fade and may cause the pvc pipes to become brittle and crack.

Rigid PVC pipes are divided into four types according to their applications: Blue pipes for drinking water and water supply., Yellow and White pipe For electrical and telecommunication cable conduites and Gray pipes used in agriculture and industrial purposes.

PVC pipe, being a plastic pipe tends to shrink in low temperatures and according to the tests, PVC pipes can be installed and used up to -18°C. In very low temperatures, the plastic pipe may shrink as well as the water in the pipe can freeze. and also cause the tensile strength of the PVC pipe to increase. It is recommended to use the PVC pipes according to recommended temperatures only.

PVC pipe expands in high temperatures. PVC pipes can be installed and used in temperatures up to 65°C. PVC pipe tends to have a high impact resistance and becomes more flexible in higher temperatures and decrease in the tensile strength causing the pipe to bend. Also at very high temperatures, the glue adhesive may degrade causing a leak at the joints. It is recommended to use the PVC pipes according to recommended temperatures only.

As the rigid PVC pipes are manufactured from high quality PVC resin having smaller molecules than water and formed amorphously, water and other liquids cannot pass through the pipes. However, if the joints or rubber seals degrade, there may be a possibility that water or liquid can penetrate through those spots.

PVC pipes are highly resistant to chemicals. PVC pipe is resistant to oils, fats, alcohols and is resistant to aliphatic hydrocarbon chemicals. However, PVC pipe is not suitable for chemicals such as Aromatic and chlorinated hydrocarbons, ketones, nitro compounds, esters and cyclic ethers, etc. Feel free to consult Thai Vinytech(2002) technical support team or learn more at https://anyflip.com/lbrus/fqnf/

Chlorine is commonly used to kill germs and bacteria in the water supply system all over the world. PVC pipes are highly resistant to chlorine. causing no effect on the PVC pipes

Polyvinylchloride is it self non flammable polymer. PVC pipes are commonly used for electrical and telecommunication cables conduits and can withstand tempertature up to 150°C

PVC pipes manufactured according to TIS. 17-2561 industry standards will be inspected for quality control of pipes regarding the effect on water. Water flowing throught the PVC pipe must have no smell, taste and color change and must not contain toxic substances dissolved out that are harmful and unfit for human consumption. This ensures that the pipes produced from Thai Vinytech (2002) Co., Ltd. is a high quality PVC pipe and safe pipe for drinking water.

PVC pipes manufactured according to TIS. 17-2561 industry standards are required to test for soluble content extraction. This ensures that the pipes produced by Thai Vinytech (2002) Co., Ltd. is a high quality PVC pipe and absolutely free from any toxic substances. Thai Vinytech (2002) pipes also recieved the "Green Lable" certification from the Thailand Environment Institute ensuring that the PVC pipes are environmental friendly and toxic free.

The marking on PVC pipes indicates; Name of Manufacturer, Pipe size, Pressure class, TIS. or Thai Industrial Standard, Length of Pipe, Year Of Manufacturing, Recycle Mark, application "drinking water pipe".

HDPE pipe is black because the raw material is compounded with carbon black to make HDPE pipe resistant to ultraviolet (UV) light and allows the HDPE pipe to function up to 50 years.

HDPE pipe with “blue” stripes are used for drinking water and potable water
HDPE pipe with “green” stripes are used for drainage pipe, sewer pipe and golf course drainage pipe
HDPE pipe with “red or orange” stripes are used for electrical, telecommunication and cable conduits.
HDPE pipe with “yellow” stripes are used for gas pipes
HDPE pipe with “grey” stripes are used for chemical pipes, industrial pipes and mining pipes.
HDPE pipe with no stripes are used for agriculture pipes

PN stands for pressure nominal. It is the ability of the pipe to withstand the pressure measured in bars. HDPE is classified into 10 PN, i.e., PN 3.2, PN 4, PN 6, PN 8, PN 10, PN 12.5, PN 16.5, PN 20 and PN 25 where PN 3.2 can withstand pressure upto 3.2 bars, PN 4 can withstand pressure upto 4 bars, PN 6 can withstand pressure upto 6 bars, PN 8 can withstand pressure upto 8 bars, PN 10 can withstand pressure upto 10 bars, PN 12.5 can withstand pressure upto 12.5 bars, PN 16 can withstand pressure upto 16 bars, PN 20 can withstand pressure upto 20 bars และ PN 25 can withstand pressure upto 25 bars. For more information about Thai Vinytech (2002) HDPE pipes, please visit https://tvtpipe.com/hdpe-pipes/

PE or Pressure class is calculated from the minimum required strength or MRS to know how much the pipe can withstand external pressure. It is classified into PE80 and PE100 where PE80 have minimumrequired strength of 8.0 Mpa and PE 100 have minimum required strength of 10.0 Mpa. or more information about Thai Vinytech (2002) HDPE pipes, please visit https://tvtpipe.com/hdpe-pipes/

HDPE pipe are normally welded in 5 ways: Butt fusion or heat welding, Electrofusion or electric heat welding, Compression fittings, Socket fusion, Mechanical bolt or mechanical welding.

Butt fusion is the most common type of welding. The two ends of the pipes are heated and joined together under constant temperature, pressure and time.

Electrofusion is a type of welding where prefabricated fittings with internal coils are present for creating electrical circuit and are produced by injection molding are used. The electric current are passed through the positive and negative cathodes and anodes to heat and melt the ends of the pipe under constant temperature and time and used with the same pipe diameter.

Compression fittings types fittings without heat. Simply attach the end of the pipe to the fitting and lock them together. Most compression fittings are used for pipes up to 110 mm diameter and used under low pressure.

Socket fusion is a type of welding where prefabricated fittings are produced by injection molding are used. Both the ends of the pipes are heated along with the socket fusion fittings at constant temperature and time allowing the pipes and the fittings to be molded together. Socket fusion works well with pipes up to 110 mm diameter and can withstand high pressure.

Mechanical Bolt or mechanical welding is done using nuts and bolts to attach both ends of the pipes. This method is suitable for welding different types of pipes such as PE pipes and PVC pipes or PE pipes and steel pipes, etc.

HDPE pipes are manufactured from High Density Polyethylene which has very high environmental resistance properties allowing it to be used for more than 50 years.