|
Pipes
projects |
Ardi
multilayer pipes |
Ardi
PEX pipes |
PPR
pipes |
UPVC
pipes |
|
Thermal coefficient (w/m.K) |
0.45 |
0.41 |
0.24 |
|
|
Thermal expansion ratio |
2.5×10-5(almost equal to
the value of aluminum) |
2.0×10-4 |
1.8×10-4 |
3.9×10-5 |
|
Packing |
coil |
coil |
straight |
straight |
|
Cutting |
easiest |
easiest |
easy |
easy |
|
Jointing type |
screw or press fitting |
screw or press fitting |
heat-fusion |
adhesive with solvent |
|
Installing |
easy |
easy |
difficult(need special heat-fusion tools) |
difficult(need special solvent) |
|
Operation condition |
Tmax=95℃
pressure:1Mpa |
Tmax=90℃
pressure:0.6Mpa |
Tmax=70℃ pressure:1Mpa |
Only for cold water |
|
Bending at room temperature |
easy but no spring back
for small size pipe |
easy but spring back |
no bending |
no bending |
|
Low temperature resistance |
excellent |
excellent |
bad |
bad |
|
Stress crack resistance |
excellent |
excellent |
bad |
bad |
|
Size stability |
high |
lower |
lower |
lower |
|
Gas permeability |
0 |
little(need barrier layer) |
little |
little |
|
Chemical resistane |
excellent |
excellent |
good |
general |
|
Heat-aging resistance |
good |
good |
bad |
bad |
|
Hygiene |
excellent |
excellent |
excellent |
general
(need to add kinds of additives) |
|
Price(for small-diameter pipes) |
high |
lowest |
lower |
lower |
|
Application scope |
Petable water supply system, compressed air pipeline,
floor-heating system etc. |
Cold-hot piping system and floor-heating system etc.
|
Cold-hot piping system with lower temperature. |
Only used for drainage system in general. |
