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Upper Structure Product Groups

Service Life, Frequently Asked Questions


Service Life

20 ° It is guaranteed for 50 year in 20 °C under PN12,5 bar pressure. When the graphs within the Standard of the product are examined, it is observed that its life is 50 years in 95 °C’de PN11 bar pressure.

Frequently Asked Questions

1. Where are PEX pipes used?

These pipes are not only used especially in heating systems but also used in plumbings. Underfloor heating, radiator entries (mobile system) are main areas.

2. How many types of PEX? What are the differences between them?

PEX has a, b, c, and d types. All of them are tested according to the same Standard. The only difference between them is their production methods. Crosslink is provided with PEXa peroxide, PEXb silane, PEXc radiation and PEXd Azo method.

3. What is thermoset?

Plastics brought into granules and used are called as thermoplastic, those not used are called as thermoset. After shaping PEX by production, it turns into crosslink structure. Polymer chains make a connection with side chains and take form of one molecule. After this state, it is impossible to use as new product again. Therefore, it is included in thermoset group.

4. What are the intervals of tubing in floor heating?

Pipe intervals shall be 10 cm. It shall be 5 cm in parts such as window and balcony where heat losses are high.

5. How many pipes are necessary for one m2 area?

10 m for the middle part, 20 m for the window edge.

6. What is the amount of heat transfer at room temperature of 20 °C within 45 °C water.

152 W/m2 in 181 W/m2 , 24 °C room.

7. What happens if I coat with hardwood?

Value calculated in ceramic is the value given. This value decreases %32 in hardwood, % 25 in carpet and % 50 in laminate.

8. What is PEX heat transfer coefficient?

λ=0,41 W/m.K

9. What is PEX expansivity?

2.10-4 K-1

10. How much water is there in one meter of Ø16*2 pipe?

113 gr

11. What is water velocity in mobile system?

Because water flow in one part is 7,5 lt/h, speed calculated in a radiator with 6 parts is 0,65 m/s.

12. What is the maximum pipe length in mobile system?

Here it should be considered that pipes coming out of the collector are not in very different lengths. If not considered a short circuit occurs. In this system it is important to adjust valve according to rather than length of pipe 7,5 lt/h fluid per a part of each mouthpiece. It is provided with smallflow water installed to this system.

13. What is strophor density?

Strophor density should be 16-18 gr/cm3. If load amount to be put on alum is too much, density should be risen up to 20-22.

14. What should strophor thickness be?

Strophor thickness in normal floors is 20 mm, 40 mm on soft ground such as soil should be applied. Nylon canvas should be laid on straphor.