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Choosing the Correct Pipe Insulation

There are a wide range of Insulation Types available.  This guide will explain the most suitable types of insulation for the most common applications.

 

Before you choose the type of Insulation, you'll need to know two important factors - your pipe bore (the diameter) and the thickness of the insulation you require ("the wall thickness")

wall_bore

1. Pipe Bore (Diameter)

The pipe diameter (or bore) can be measured in imperial sizes (in inches) or metric sizes (in mm).  For insulation purposes, both measurements refer to the outside diameter (O.D) of the pipe.

When measuring steel pipe, it is important to remember that the OD measurement will be greater than the actual internal bore size - this is because steel pipe has a substantial thickness of several mm.  For instance, a steel pipe with a 25 mm bore, will have an outside diameter (OD) of 34 mm. This does not apply to copper pipe.

2. Insulation Thickness (Wall Thickness)

All of our pipe insulation products are available in a number of different thicknesess (also refered to as wall thickness).  As a rule of thumb - thicker insulation = less heat loss from pipes and greater protection from freezing temperatures.

The diagram below illustrates the relative thickness of the insulation available on a standard copper pipe:

relative

 For outdoor pipework, we recommend a minimum insulation thickness of 19mm.

 

Insulation Types: 

Grey Foam Insulation -  Armacell Tubolit and Kaimann Kaiflex PE grey_foam inside_outside

Our most economically priced Insulation.  Made from grey polyethylene foam , the insulation is ideal for use in domestic pipe work and plumbing.  It is available in all of the common domestic pipe sizes and is available in several wall thicknesses.  The insulation is supplied in either one or two metre lengths and comes semi-split for ease of installation.  This insualtion is not suitable for outdoor use.

 

Class O Nitrile Foam Rubber Insulation -  Armaflex and Kaimann ST classo indoor_outdoor

Class O Insulation is a flexible, closed cell, elastomeric, nitrile rubber insulation that offers reliable protection against condensation and effectively prevents energy loss. It is available in a number of formats including 2 metre unsplit tubes, long coils, sheets and also as a pre-slit self seal tube that reduces installation times by up to 30%. The insulation is very vesatile and can be used in a wide range of applications including domestic, plumbing and air conditioning.  Class O insulation (The class O refers to the fire standard) can be used on hot pipes up to a temperature of 105 degrees celcius.  For temperatures above this (up to 150 degrees), an EPDM rubber insulation would be more suitable (see below).

*Class O insulation can be used outdoors, but will require futher protection from UV exposure, such as one of the Armafinish Paints.  Without additional protection, the insulation will eventually crack and crumble.

 

EPDM Foam Rubber Insulation - Armaflex HT and Kaiflex EPDM HT 2ticks_no_ast

EPDM rubber insulation is ideal for outdoor, high temeperature and solar pipework use.  The insulation has an in built UV protective layer, meaning it can be installed outside without any further treatment or coverings.  The insulation is also suitable for high temeperature pipe work (up to 150 degrees celcius), making it ideal for use on solar heating systems.  The insulation is available in 2 metre unsplit tube lengths, long coils and flat sheets in a range of wall thicknesses.  For outdoor use, we recommend a minimum insulation wall thickness of 19mm.

 

Mineral Fibre Insulation - Foil Coated - Rockwool and Paroc mineral_wool indoor_outdoor

Designed for use in heating, ventilation and air conditioning applications, mineral fibre insulation is able to withstand temeperatures of up to 700 degrees celcius.  The insulation is provided as mineral fibre insulation sections which have a factory applied foil covering with an integral adhesive overlap.  This greatly speeds up installation times.  The insulation can be used either indoors or outdoors.  *If used outdoors however, an additional protective covering sheet known as Polyisobutylene (PIB) needs to be applied.

 

Phenolic Foam Insulation - Foil Covered - Kingspan Kooltherm phenolic indoor_outdoor 

Phenolic foam insulation is the most energy efficient insulation availble for any given thickness.  It is typically used in industrial applications in the heating, ventilation, air conditioning and structural petrochemical and maritime sectors.  The pipe insulation is supplied in foil-faced sections for a range of pipe diameters.  In addition, the material is available in slab and sheet form and can be used as roofing and wall insulation. Phenolic foam insulation can be used at temeperatures up to +120 degrees celcius and as low as -50 degrees celcius.   As with mineral wool Insulation, phenolic insulation can be used outdoors * but will require additional covering with Polyisobutylene (PIB) sheeting.

 

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