Pipe insulation is not simply a thermal barrier. On chilled-water and refrigeration systems, the insulation must also help control moisture.
This is where closed-cell insulation tubing becomes particularly useful.
Scudoflex NBR uses a flexible closed-cell elastomeric foam structure designed for HVAC, chilled-water, refrigeration and mechanical-service applications.
What is closed-cell insulation?
Closed-cell foam contains a cellular structure designed to limit the movement of moisture through the insulation.
For cold pipework, this is important because condensation can form when the external pipe surface falls below the surrounding air's dew point.
A properly selected and installed closed-cell insulation system helps maintain the pipe surface above the dew point while reducing thermal transfer.
Why HVAC contractors use tubing
Preformed insulation tubes can simplify installation around circular pipework.
The advantages include:
- Consistent insulation thickness
- Faster installation
- Flexible fitting around pipework
- Reduced cutting waste
- Easier coverage of straight pipe sections
- Better control of insulation continuity
Scudoflex NBR tubes cover nominal internal diameters from 6 mm to 114 mm, with thicknesses from 6 mm to 32 mm.
Closed-cell insulation in chilled-water systems
Chilled-water systems are particularly sensitive to condensation.
If joints, supports, valves or pipe penetrations are inadequately insulated, moisture can reach cold surfaces and create problems including:
- Condensation
- Water dripping
- Corrosion risk
- Damaged ceiling finishes
- Reduced insulation performance
- Increased maintenance requirements
Therefore, the insulation specification should address the complete system, not only the straight pipe sections.
Installation details matter
A high-performance insulation material cannot compensate for poor joints.
Installers should pay attention to:
Joints: Seal insulation joints properly so that the vapour-control layer remains continuous.
Supports: Pipe supports require appropriate detailing to prevent compression and thermal bridges.
Valves and fittings: Insulate fittings and transitions rather than leaving exposed cold surfaces.
External installations: Scudoflex states that external installations require suitable protection from weather and ultraviolet exposure.
Closed-cell insulation tubing in Pakistan
For commercial HVAC projects in Islamabad, Rawalpindi, Lahore and Karachi, the insulation specification should take local ambient conditions into account.
A chilled-water installation in a humid plant room has different condensation-control requirements from a dry indoor environment.
The same principle applies to refrigeration systems, cold-water services and mechanical equipment.
Technical performance
Scudoflex NBR publishes:
- Thermal conductivity of 0.032 W/m·K at 10°C
- Vapour diffusion resistance factor μ >17,000
- ASTM E84 FSI <25 / SDI <50
- BS 476 Class 0
- UL 94 HF-1, V-0, 5VA
These values are published technical-literature values and should be verified against the current project datasheet.
Selecting the right tube
Before ordering closed-cell insulation tubing, provide:
- Pipe outside diameter
- Pipe material
- Operating temperature
- Ambient temperature
- Humidity
- Required insulation thickness
- Fire-performance requirement
- Indoor/outdoor installation
- Facing requirement
- Quantity
This information allows the correct insulation format and thickness to be specified.