Advantages of Stahlmann Corrugated Tubes
When the tube is bent, its flow area remains intact; there are no microcracks and no mechanical stress on the metal
The tube is easy to cut and bend without special tools, no welding required for joints
Stahlmann tubes last longer as they are 20% more resistant to deformation than PEX during heating/cooling processes
Permissible bending radius of 30 mm enables installation of complex pipelines, inaccessible for other tube types
Stahlmann tubes are 100% airtight, leading to a long productive lifetime of the underfloor heating system
Due to the use of polished stainless steel strip
20% higher heat transfer compared to PEX
For corrugated stainless steel tubes
Advantages of Stahlmann Corrugated Tubes
Easy installation
The tube is easy to cut and bend without special tools, no welding required for joints
High efficiency
20% higher heat transfer compared to PEX
Resistant to deformation
as they are 20% more resistant to deformation than PEX during heating/cooling processes
Remarkable flexibility
Permissible bending radius of 30 mm enables installation of complex pipelines, inaccessible for other tube types
Resistant to corrosion
Stahlmann tubes are 100% airtight, leading to a long productive lifetime of the underfloor heating system
The inner surface of the tube has no tendency to accumulate deposits
Due to the use of polished stainless steel strip
Maximum strength and reliability
When the tube is bent, its flow area remains intact; there are no microcracks and no mechanical stress on the metal
Lifetime warranty
For corrugated stainless steel tubes
Over Plastic Tubes
High efficiency — heat conduction coefficient = 17 W/m*K, With a heat conduction coefficient of 17 W/m(deg)K, the heat transfer is 20% higher with corrugated pipes than with plastic tubes.
Easy to cut and bend, which ensures an easy assembly. high factor of safety against multiple bending failure.
The ultimate flexibility — permissible bending radius is equal to double diameter of the tube!
This makes it possible to mount tubing with complex geometry as opposed to other tube types.
Zero oxygen permeability.
When bending, the flow area remains unchanged, micro-cracks do not appear and no mechanical tension is developed
No damage after freezing-thawing cycles and harsh temperature changes. You can avoid connections located in concrete screed, as long coils of 100 m and 200 m make it possible to lay loops of any length with no joints. linear expansion coefficient
No intermediate connections located in a concrete screed — coils of 100 m and 200 m make it possible to lay loops of any required length without any joint.
Corrosion resistance is ensured by the tube material.
The tube internal surface is protected against impurities deposition due to use of the stainless steel polished tape and water flow turbulence.
When heating up to 50 °C, the lineal expansion coefficient is 20 times less than of PEX tubes!
Environmentally-friendly. The tubes do not emit any harmful components into the environment during manufacturing, recycling or use. No emitting any harmful components into the environment.
Reliability. Made using modern equipment observing international industrial standards.
Life-time guarantee over the tube service life (not less than 30 years!)
Advantages Of Corrugated Stainless Tubes Over Plastic Tubes
Thermal tests of water underfloor heating
Let’s compare the heat output of a water underfloor heating system based on steel corrugated pipes versus based on plastic pipes
Calculation of heat transfer capacity
is carried out according to the formula:
p = c – G – (TVHo & TVHi) / S
Where
c = 4200 J/kg-K — heat capacity of water
G — mass flow rate of water, kg/s
S — layout area, m2
Tvh and Tvh — water temperature at the outlet and inlet to the layout
The test
Layout of two areas of 7.5 m2 each.
In each area 45m of pipe were laid on an insulating mat with a pitch of 150mm
Area № 1 – cross-linked polyethylene pipe PEX 16×2,
Area № 2 – steel corrugated tube Stahlmann 15A.
Water flow rate – 1.65 l/min (0.0275 kg/s).
Floor temperature field
Water heating floor
based on PEX pipe
Water heating floor
based on Stahlmann steel pipe
Comparison
and PEX pipes
| Type of pipe | PEX 16 | PEX 20 | IWS 15A | IWS 20A |
|---|---|---|---|---|
| Inner diameter of the pipe, mm | 12 | 15 | 14,1 | 21 |
| Outer diameter of the pipe, mm | 16 | 20 | 18,1 | 25,6 |
| Wall thickness, mm | 2 | 2,5 | 0,3 | 0,3 |
| Thermal conductivity of pipe material, W/m-K | 0,5 | 0,5 | 56 | 56 |
Calculation comparison
of PEX pipe and Stahlmann (IWS) 15A pipe applications
Calculation comparison
of PEX pipe and Stahlmann (IWS) 15A pipe applications
| Variant № | 1 | 2 | 3 |
|---|---|---|---|
| Material of pipe | PEX 16 | PEX 20 | IWS 15A |
| Inner diameter of the pipe, mm | 12 | 15 | 14,1 |
| Outer diameter of the pipe, mm | 16 | 20 | 18,1 |
| Wall thickness, mm | 2 | 2,5 | 0,3 |
| Thermal conductivity of pipe material, W/m-K | 0,5 | 0,5 | 56 |
| Loop length, m | 50 | 50 | 50 |
| Thermal resistance of the pipe including convection inside, m-K/W | 0,10 | 0,11 | 0,008 |
| Difference between the temperatures of the coolant and the pipe surface | 1,6 | 1,7 | 0,1 |
Comparison
of Stahlmann corrugated pipes and PEX pipes
| Type of pipe | PEX 16 | PEX 20 | DN15 | DN 20 |
|---|---|---|---|---|
| Inner diameter of the pipe, mm | 12 | 15 | 14,1 | 21 |
| Outer diameter of the pipe, mm | 16 | 20 | 18,1 | 25,6 |
| Wall thickness, mm | 2 | 2,5 | 0,3 | 0,3 |
| Thermal conductivity of pipe material, W/m-K | 0,5 | 0,5 | 56 | 56 |
Calculation comparison
of PEX pipe and Stahlmann (IWS) 15A pipe applications
89,1
91,4
101,0
(+12%)
Heat flux W/m2
Calculation comparison
of PEX pipe and Stahlmann (IWS) 15A pipe applications
| Variant № | 1 | 2 | 3 |
|---|---|---|---|
| Material of pipe | PEX 16 | PEX 20 | IWS 15A |
| Inner diameter of the pipe, mm | 12 | 15 | 14,1 |
| Outer diameter of the pipe, mm | 16 | 20 | 18,1 |
| Wall thickness, mm | 2 | 2,5 | 0,3 |
| Thermal conductivity of pipe material, W/m-K | 0,5 | 0,5 | 56 |
| Loop length, m | 50 | 50 | 50 |
| Thermal resistance of the pipe including convection inside, m-K/W | 0,10 | 0,11 | 0,008 |
| Difference between the temperatures of the coolant and the pipe surface | 1,6 | 1,7 | 0,1 |
