Armaflex Class O Pipe Insulation 76mm x 25mm

Armaflex Class O Pipe Insulation 76mm x 25mm has a thick 25mm wall for 76.1mm pipe, so 76mm copper or 2 1/2 inch steel. It is the heavy grade, used on chilled water mains and cold supplies that pass through frost-prone areas.

Armaflex Class O Pipe Insulation 76mm x 25mm on chilled lines

A large chilled main can sweat heavily if the lagging is too thin. The 25mm wall keeps the foam surface warm enough to stay dry in most conditions. The closed cells also slow water vapour, so moisture does not build up inside the foam over time.

• For 76.1mm copper or steel
• 25mm foam wall
• About 126mm across fitted
• 2 metre lengths

The outside size is around 126mm, so check spacing between pipes and at openings before you buy. Glue each split and end, then fit insulated supports on chilled pipework so the clips do not drip. Thinner walls for this bore sit in pipes, hoses and insulation.

Where to buy in Glasgow

To collect, come to Plumb Parts at 555 South Street, Glasgow G14 0QX. You can also order online. The shop opens Mon-Fri 8am-5pm or Sat-Sun 8am-1pm.

Specification

• Brand: Armaflex
• Range: Class O pipe insulation
• Material: Flexible closed cell elastomeric (nitrile rubber) foam
• Sizes: 76mm bore, 25mm wall, 2m lengths
• Standard or approval: Class O fire performance, as named
• Suitable for: Insulating 76mm pipe

Common Questions

Why fit 25mm wall on a 76mm chilled line?

Chilled water at that size carries a lot of cooling, and a thin wall would let condensation form. The 25mm wall gives the most protection listed for 76mm.

Do insulated supports help on chilled pipe?

Yes. Supports that hold the insulation stop the foam being crushed at brackets, which is where condensation usually starts.

How many 76mm x 25mm lengths for a 6m chilled run?

Three 2m lengths cover 6m. Add one for valves, strainers and the joints at each end.