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What does a manufacturer alternative to metal pipes?

Jun 12th, 2010
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Today, professionals increasingly recommend the use of individual housing construction, plastic pipes for heating, hot water and equipment “warm floor”. Compare several types of PEX tubing: reinforced polypropylene pipes, cross-linked PEX and metal pipes.

Looking ahead we can say that for an individual housing fit all three types of plastic pipe listed. The only difference in the value and purpose of the pipeline. The buyer, of course, make choices based on personal preference.

Choosing the heating pipes for houses, it is important to consider the future of the coolant temperature. In private houses, heated by individual boilers, it usually does not exceed 60 – 70 ° C ‘. Water is supplied to the central arteries, may be heated to 90 ° C., and even up to 120 ° C.

Polypropylene

Jun 11th, 2010
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We reinforced pipe basic material is polypropylene, which bears the primary burden to the temperature and pressure. Outside these tubes are reinforced with aluminum foil thickness 0.15 mm and covered with a protective layer of polypropylene (PEX). The main objective of the foil – to prevent lengthening of the tube during heating. The fact that the plastic pipe due to thermal effects tend to increase in length by 0,5 – 1,5% of the original length. Here is a formula by which we can calculate the linear thermal elongation:

?L = a × L × ? t,

where:

L – linear temperature elongation (m);
a – coefficient of thermal linear extension tube (mm / m × ° C);
L – length of the straight section (m);
t – change the coolant temperature ° C.
* For reference, we present data of the coefficient a:
- For polypropylene – 0,15 mm / m × ° C;
- For cross-linked PEX – 0,15 mm / m × ° C;
- For metal plastic – 0,025 mm / m × ° C.