| |
|
| Multilayer
Pipes
| PEX
Pipe
| |
| Thermal
& pressure resistance |
| Note:1Mpa=145psi=10bar
|
Specification
|
Minimum
burst
pressure
(MPa) |
Min pipe
ring
strength
(N) |
long-term
hydrostatic
strength
(MPa) |
working temperature(≧) |
working pressure |
| (mm) |
(inch) |
pipe A |
pipe B |
pipe C |
pipe A,B |
pipe C |
| 1014 |
3/8 |
7.0 |
2300 |
2.7 |
-40~60 |
-40~95 |
-20~40 |
1.0 |
0.4 |
| 1216 |
1/2 |
6.0 |
2300 |
2.7 |
| 1418 |
9/16 |
6.0 |
2300 |
2.7 |
| 1620 |
5/8 |
5.0 |
2500 |
2.7 |
| 2025 |
3/4 |
4.0 |
2500 |
2.3 |
| 2632 |
1 |
4.0 |
2500 |
2.1 |
| 3240 |
11/4 |
4.0 |
3500 |
2.1 |
| 4150 |
11/2 |
3.5 |
3700 |
2.0 |
| 5163 |
2 |
3.5 |
5500 |
2.0 |
| 6075 |
21/2 |
3.5 |
6000 |
2.0 |
|
| |
| Thermal
conductivity |
| 0.45W/m.k,
about 1/100 that of steel pipe but only several
times higher than that of insulating materials. |
| |
| Corrosion
resistance |
The
inside and outside polyethylene are a kind of
symmetrical and non-polar material with stable
characteristic. At normal temperature, it does
not dissolve in any known solutions and is esistant
against various kinds of acid, alkali and salt. |
| |
| Hygiene |
| Rifeng
pipe is hygienic, toxic free, rust free and no
growth of microorganism,thus avoiding contamination
to water . It has acquired' Approval of Hygienic
Product for Potable Water'(YUE WEI SHUI ZI [1997]S0008),
and has passed all the tests of pipe for potable
water in accordance with the British Standard
BS6920 by the British WQC and tests by HongKong
Polytechnic University. |
| |
Weathering
quality and working life
It can be concluded from this graph that if utilized
under the stipulated conditions and pressures
, Rifeng Pipe can have a working life of more
than 50 years. The compelling weathering test
by the Compound Material Research Institute of
National Chemical Ministry also proves that Rifeng
Pipe can have a working life of 50 years. |
| Better earthquake resistance of structure |
| Shaken but not stirred, Rifeng pipes are flexible. This is not only means that they are easy to install but also reliable-especially when an earthquake strikes. |
| |
| Hydraulic
Function |
The
roughness coefficient of Rifeng Pipe is 0.007mm.The
inside wall is very smooth,scale free and low
flow resistant
which makes Rifeng Pipe ideal for fluid(such as
water)carrying.Due to her hard but flexible composite
structure,
the lashing pressure is quickly eliminated, thus
no disturbing sound occurs. |
| |
| Oxygen-permeability
of various kinds of plastic pipes |
 |
| Installation |
Bendable but never spring back,
decreases lots of fittings
attached,easy installation,spares
lots of installation time. |
| |
| Other
advantages |
| The core layer of Aluminium guarantees
static resistance, lightness and oxygen
tightness,it also ensures no growth
of microorganism inside water pipe
and the safety in gas supply. |
|
|
Coefficient of heat expansion
25〜10-6m/m.k, only 1/8 that of
all polyethylene pipe, almost the same as that
of aluminium pipe. (see right table) |
| |
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