REFRIGERATION SPECIFICATION
01 - General
01 – 01 Scope
All refrigeration pipework and associated fittings shall be insulated to prevent condensation.
Acoustic insulation of engineering service pipe and ductwork to prevent nuisance mechanical service noise shall
also be considered.
01 – 02 Standard References
The materials, components and completed installations shall conform to applicable Standards current at the time
of tendering.
Relevant standards may include:
BS 476
BS EN 12667
BS 3533
BS 5970
BS 5422
EN 13501-1
Fire Tests on Building Materials and Structures.
Thermal performance of building materials and products. Determination of
thermal resistance by means of guarded hot plate and heat flow meter
methods. Products of high and medium thermal resistance.
Glossary of terms relating to thermal insulation.
Thermal insulation of pipework and equipment in the temperature range of
-100°C to + 870°C
Method for specifying thermal insulation materials for pipes, tanks, vessels, ductwork
and equipment operating within the temperature range -40°C to +700°C.
Fire classification of construction products and building elements. Classification using
test data from reaction to fire tests.
01 – 03 Services to be Insulated
All refrigeration pipework and associated fittings shall be insulated to prevent condensation. Associated
equipment, flanges, fittings and supports shall also be insulated.
Acoustic insulation of engineering service pipe and ductwork to prevent nuisance mechanical service noise shall
also be considered.
The installation work shall be carried out by suitably trained insulation contractors who hold TICA membership.
01 – 04 Pipework Clearances
Shall, be sufficient to allow for the full thickness of insulation specified to be applied.
Be sufficient to allow for the application of high density insulated pipe supports between the pipe and any pipe
clips or hangers. This will also include provision for acoustic de-coupling materials.
01 – 05 Fire Penetration Sealing
Where service pipework passes through a fire resistant barrier Armaflex Protect R-90 shall be applied to the
pipework throughout the penetration. Armaflex Protect R-90 shall be installed as to the manufacturer’s
recommendations and to a thickness sufficient to match the fire resistance rating of the wall or barrier.
Armacell UK © • Mars Street • Oldham • OL9 6LY • 0161 287 7100 • info.uk@armacell.com • Status 16.01.2014
REFRIGERATION SPECIFICATION
02 – Materials
02 – 01 General
All insulation materials shall be:Obtained, where available from an ISO 9001:2000 “quality systems” and ISO 14001:2004 “environmental systems”
certified manufacturer.
Shown to be Formaldehyde free in order not to contribute towards the maximum long term exposure limit of 2
parts per million (as recommended by the HSE).
Shown to inhibit the growth of mould.
All Armaflex materials shall be installed as to the manufacturer’s recommendations using the appropriate Armaflex
adhesive:
Product
AF/Armaflex Class O
HT/Armaflex
Armaflex Ultima
Appropriate Adhesive
Armaflex 520 Adhesive or Armaflex RS850 Adhesive
Armaflex HT625 Adhesive
Armaflex Ultima 700 Adhesive or Armaflex Ultima RS850
Adhesive
Insulation installed in locations exposed to weather conditions shall be provided with a suitable weather resistant
finish in the form of a covering of Armafinish 99 UV protective paint.
All thermal insulation shall have an ozone depletion potential (ODP) of 0 and global warming potential (GWP) of 0
as required.
The thermal insulation must be CE marked in accordance with the relevant European standard.
All AF/Armaflex Class O shall be manufactured in the UK by Armacell UK Ltd in Oldham.
03 – Insulation
03 – 01 Selection
Shall be:For refrigeration pipework
Internal applications
AF/Armaflex Class O elastomeric nitrile rubber with a Class O fire rating when tested under BS 476 Part 6
and BS 476 Part 7 or Armaflex Ultima with at least Euroclass B-s2,d0 fire rating according to EN 13501-1.
The thickness of insulation shall be sufficient to prevent condensation under specified conditions. The
material shall be CFC and H-CFC free. The material shall incorporate Microban® anti-microbial protection to
actively inhibit the growth of mould.
External applications
UV resistant HT/Armaflex elastomeric EPDM rubber. The thickness of insulation shall be sufficient to
prevent freezing under specified conditions. The material shall be CFC and H-CFC free.
Or:
AF/Armaflex Class O elastomeric nitrile rubber painted using Armafinish 99 resistant paint.
Armacell UK © • Mars Street • Oldham • OL9 6LY • 0161 287 7100 • info.uk@armacell.com • Status 16.01.2014
REFRIGERATION SPECIFICATION
03 – 02 Thermal Insulation Materials
Material
Temp Range
AF/Armaflex Class
O
HT/Armaflex
-50ºC to
+110ºC
-50ºC to
+150ºC
-50ºC to
+110ºC
Armaflex Ultima
“K” Value
W/mK at
mean temp
0.033 @ 0ºC
ODP
Rating
GWP
Rating
Fire
Class
0
0
Class O
0.042 @ 40ºC
0
0
Class 1
0.040 @ 0°C
0
0
B-s1,d0 /
B-s2,d0
Typical
material
density kg/m3
To be around
50
65
65
For temperatures down to -200°C contact the insulation manufacturer’s technical department.
04 – Protection and Protective Coverings
04 – 01 Internal Coverings
Shall be:
For AF/Armaflex Class O elastomeric nitrile rubber:
For high level insulated pipework or concealed insulated pipework:
No additional protective covering shall be required.
For exposed pipework at low levels:
Armaflex Tuffcoat or Arma-Chek Silver pre-covered PVC film / laminate or Arma-Chek D woven glass fibre cloth
bonded using Armaflex 520 or Armaflex RS850 adhesive with a minimum 50 mm overlap at all longitudinal seams
and Arma-Chek D tape used to cover butt joins. Associated equipment, flanges, fittings and supports shall also be
insulated. Installation shall be in all cases to the manufacturer’s recommendations.
All excess adhesive visible on the surface of the completed assembly shall be removed using an appropriate
cleaning fluid such as Armaflex Cleaner.
04 – 02 External Coverings
Shall be:
For HT/Armaflex:
No covering shall normally be required when using HT/Armaflex outdoors due to the natural
in-built resistance against UV degradation.
Armacell UK © • Mars Street • Oldham • OL9 6LY • 0161 287 7100 • info.uk@armacell.com • Status 16.01.2014
REFRIGERATION SPECIFICATION
For AF/Armaflex Class O elastomeric nitrile rubber:
Either:
UV resistant Armaflex Tuffcoat or Arma-Chek Silver PVC coverings (pre-covered tubes and sheet available).
Seams to be bonded using Armaflex 520 or RS850 adhesive and covered using Armaflex Tuffcoat or ArmaChek Silver tapes respectively (Armaflex Tuffcoat mastic also recommended to provide a watertight seal
for outdoor applications). All material shall be overlapped and staggered in such a way as to ensure a
watershed is always provided. Installation shall be in all cases to the manufacturer’s recommendations.
All excess adhesive visible on the surface of the completed assembly shall be removed using an
appropriate cleaning fluid such as Armaflex Cleaner.
Or
High density rubber cladding of the “Arma-Chek R” type bonded using an appropriate full contact adhesive
with a minimum 50 mm overlap at all butt joints and longitudinal seams. A weather proof Arma-Chek
mastic sealant shall be applied over all seams and joints. All material shall be overlapped and staggered in
such a way as to ensure a watershed is always provided. Installation shall be in all cases to the
manufacturer’s recommendations.
All excess adhesive visible on the surface of the completed assembly shall be removed using an
appropriate cleaning fluid such as Armaflex Cleaner.
Or
UV resistant “Arma-Chek D” woven glass fibre cloth bonded using an appropriate full contact adhesive
with a minimum 50 mm overlap at all butt joints and longitudinal seams. A weather proof mastic sealant
shall be applied over all seams and joints. All material shall be overlapped and staggered in such a way as
to ensure a watershed is always provided. Installation shall be in all cases to the manufacturer’s
recommendations.
All excess adhesive visible on the surface of the completed assembly shall be removed using an
appropriate cleaning material.
Or
Armafinish 99 UV resistant paint.
04 – 03 Vapour Barriers
Shall be:
For AF/Armaflex Class O elastomeric nitrile rubber and Armaflex Ultima:
Built into the insulation material. The insulation shall have a moisture resistance factor no
less than 6,000. No additional external water vapour barrier shall be necessary.
For HT/Armaflex:
Built into the insulation material. The insulation shall have a moisture resistance factor no
less than 3,000. No additional external water vapour barrier shall be necessary.
Armacell UK © • Mars Street • Oldham • OL9 6LY • 0161 287 7100 • info.uk@armacell.com • Status 16.01.2014
REFRIGERATION SPECIFICATION
04 – 04 Insulation of Pipework Supports
Shall:In all cases have all pipe clips and hangers attached to the outside of the insulation. Metal saddles to be used to
prevent crushing of the insulation. Be applied such that pipes are acoustically de-coupled from the building
structure. High load bearing pipe supports of the Armafix type shall be preferred and installed to manufacturer’s
recommendations.
Be insulated with a thickness sufficient to prevent condensation.
04 – 05 Insulated Valve and Flange Cover Boxes
Shall be manufactured directly from the insulation material itself as according to the manufacturer’s
recommendations. The covering of fabricated flange or valve covers shall be as for the insulation on the remainder
of the attached service pipes.
Armacell UK © • Mars Street • Oldham • OL9 6LY • 0161 287 7100 • info.uk@armacell.com • Status 16.01.2014