Why is cold insulation harder than hot?

Because it has to stop vapour as well as heat. Any interruption in the vapour barrier lets humid air reach the cold surface and condense inside the insulation, where it saturates the material and corrodes the pipe underneath.

What causes corrosion under insulation?

Water held against the substrate — from a vapour barrier defect, a cladding joint that leaks, or a penetration that was never sealed. It progresses unseen because the cladding hides it, which is why substrate condition should be checked whenever insulation is removed.

Do you supply removable covers?

Yes. Valves, flanges and instruments that need regular access are better served by removable and reusable covers than by insulation that is destroyed and rebuilt at every intervention.

Thermal Insulation Contractor Bahrain | Hot & Cold

Insulation looks like a finishing trade and behaves like a process one. On hot systems it controls energy loss and surface temperature; on cold systems it controls condensation, and a defect there causes corrosion under insulation that is invisible until the cladding comes off.

Cold insulation and the vapour barrier

On a chilled or refrigerated system the insulation is not the critical component — the vapour barrier is. Warm humid air carries moisture toward the cold surface, and any interruption in the barrier lets it condense inside the insulation, where it stays. The result is saturated insulation, no thermal performance and corrosion under insulation on the pipe beneath.

Continuous vapour barrier across the full system, including supports
Insulated pipe supports so the barrier is not pierced at every hanger
Vapour stops at intervals and at terminations to limit any ingress
Sealed penetrations at valves, flanges and instruments
Multi-layer construction with staggered joints on thicker applications

Hot insulation

Pipework, vessel, tank and equipment insulation
Personnel protection to hot surfaces within reach
Removable and reusable covers for valves and flanges requiring access
Expansion provision on hot systems that move
Heat trace accommodation where fitted

Materials

Mineral wool and rockwool for hot service
Closed-cell phenolic, PIR and elastomeric for cold service
Closed-cell spray polyurethane foam for tanks and irregular geometry
XPS rigid board where compressive strength is required
Calcium silicate for high-temperature applications
Acoustic insulation for noise attenuation

Finishing

Aluminium and stainless steel metal cladding, formed and banded
Weatherproofing and mastic sealing at joints and terminations
Lagging, canvas and coating finishes where cladding is not specified
Identification and flow marking

Corrosion under insulation: where existing insulation is removed, the substrate condition should be assessed before re-insulating. Re-cladding over a corroding surface conceals the problem for several more years.

Standards we work to

BS 5422
BS 5970
ASTM C547
ASTM C534
EN ISO 12241
ASTM C1136

Thermal and industrial insulation