| |
| | Multilayer Pipes
| |
| 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______________ |
| Dunxiang 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 , Dunxiang 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 Dunxiang Pipe
can have a working life of 50 years. |
| Burning resistance______________ |
| The PE(X)-AL-PE(X) composite
structure acquires Dunxiang Pipe a much better burning resistance
than that of all polyethylene pipe.With the test by the National
Fire-proof Construction Material Quality Supervisory Test
Center,the burning resistance of Dunxiang Pipe is proved to
reach Grade B1 of GB8624,stipulations for wire and cable conduit
plastic material. |
| |
| Hydraulic
Function ______________ |
The roughness coefficient
of Dunxiang Pipe is 0.007mm.The inside wall is very smooth,scale
free and low flow resistant
which makes Dunxiang 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) |
| |
| |
